src/rrd.c

   1 #include "common.h"
   2
   3 #define RRD_DEFAULT_GAP_INTERPOLATIONS 1
   4
   5 // ----------------------------------------------------------------------------
   6 // globals
   7
   8 // if not zero it gives the time (in seconds) to remove un-updated dimensions
   9 // DO NOT ENABLE
  10 // if dimensions are removed, the chart generation will have to run again
  11 int rrd_delete_unupdated_dimensions = 0;
  12
  13 int rrd_update_every = UPDATE_EVERY;
  14 int rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
  15 int rrd_memory_mode = RRD_MEMORY_MODE_SAVE;
  16
  17 static int rrdset_compare(void* a, void* b);
  18 static int rrdset_compare_name(void* a, void* b);
  19 static int rrdcontext_compare(void* a, void* b);
  20
  21 // ----------------------------------------------------------------------------
  22 // RRDHOST
  23
  24 RRDHOST localhost = {
  25         .hostname = "localhost",
  26         .rrdset_root = NULL,
  27         .rrdset_root_rwlock = PTHREAD_RWLOCK_INITIALIZER,
  28         .rrdset_root_index = {
  29             { NULL, rrdset_compare },
  30             AVL_LOCK_INITIALIZER
  31         },
  32         .rrdset_root_index_name = {
  33             { NULL, rrdset_compare_name },
  34             AVL_LOCK_INITIALIZER
  35         },
  36         .rrdcontext_root_index = {
  37             { NULL, rrdcontext_compare },
  38             AVL_LOCK_INITIALIZER
  39         },
  40         .variables_root_index = {
  41             { NULL, rrdvar_compare },
  42             AVL_LOCK_INITIALIZER
  43         }
  44 };
  45
  46 void rrdhost_rwlock(RRDHOST *host) {
  47     pthread_rwlock_wrlock(&host->rrdset_root_rwlock);
  48 }
  49
  50 void rrdhost_rdlock(RRDHOST *host) {
  51     pthread_rwlock_rdlock(&host->rrdset_root_rwlock);
  52 }
  53
  54 void rrdhost_unlock(RRDHOST *host) {
  55     pthread_rwlock_unlock(&host->rrdset_root_rwlock);
  56 }
  57
  58 void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
  59     if(pthread_rwlock_tryrdlock(&host->rrdset_root_rwlock) == 0) {
  60         fatal("RRDHOST '%s' should be write-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
  61     }
  62 }
  63
  64 // ----------------------------------------------------------------------------
  65 // RRDCONTEXT index
  66
  67 static int rrdcontext_compare(void* a, void* b) {
  68     if(((RRDCONTEXT *)a)->hash < ((RRDCONTEXT *)b)->hash) return -1;
  69     else if(((RRDCONTEXT *)a)->hash > ((RRDCONTEXT *)b)->hash) return 1;
  70     else return strcmp(((RRDCONTEXT *)a)->id, ((RRDCONTEXT *)b)->id);
  71 }
  72
  73 #define rrdcontext_index_add(host, rc) (RRDCONTEXT *)avl_insert_lock(&((host)->rrdcontext_root_index), (avl *)(rc))
  74 #define rrdcontext_index_del(host, rc) (RRDCONTEXT *)avl_remove_lock(&((host)->rrdcontext_root_index), (avl *)(rc))
  75
  76 static RRDCONTEXT *rrdcontext_index_find(RRDHOST *host, const char *id, uint32_t hash) {
  77     RRDCONTEXT tmp;
  78     tmp.id = id;
  79     tmp.hash = (hash)?hash:simple_hash(tmp.id);
  80
  81     return (RRDCONTEXT *)avl_search_lock(&(host->rrdcontext_root_index), (avl *) &tmp);
  82 }
  83
  84 RRDCONTEXT *rrdcontext_create(const char *id) {
  85     RRDCONTEXT *rc = rrdcontext_index_find(&localhost, id, 0);
  86     if(!rc) {
  87         rc = callocz(1, sizeof(RRDCONTEXT));
  88
  89         rc->id = strdupz(id);
  90         rc->hash = simple_hash(rc->id);
  91
  92         // initialize the variables index
  93         avl_init_lock(&rc->variables_root_index, rrdvar_compare);
  94
  95         RRDCONTEXT *ret = rrdcontext_index_add(&localhost, rc);
  96         if(ret != rc)
  97             fatal("INTERNAL ERROR: Expected to INSERT RRDCONTEXT '%s' into index, but inserted '%s'.", rc->id, (ret)?ret->id:"NONE");
  98     }
  99
 100     rc->use_count++;
 101     return rc;
 102 }
 103
 104 void rrdcontext_free(RRDCONTEXT *rc) {
 105     rc->use_count--;
 106     if(!rc->use_count) {
 107         RRDCONTEXT *ret = rrdcontext_index_del(&localhost, rc);
 108         if(ret != rc)
 109             fatal("INTERNAL ERROR: Expected to DELETE RRDCONTEXT '%s' from index, but deleted '%s'.", rc->id, (ret)?ret->id:"NONE");
 110
 111         if(rc->variables_root_index.avl_tree.root != NULL)
 112             fatal("INTERNAL ERROR: Variables index of RRDCONTEXT '%s' that is freed, is not empty.", rc->id);
 113
 114         freez((void *)rc->id);
 115         freez(rc);
 116     }
 117 }
 118
 119 // ----------------------------------------------------------------------------
 120 // RRDSET index
 121
 122 static int rrdset_compare(void* a, void* b) {
 123     if(((RRDSET *)a)->hash < ((RRDSET *)b)->hash) return -1;
 124     else if(((RRDSET *)a)->hash > ((RRDSET *)b)->hash) return 1;
 125     else return strcmp(((RRDSET *)a)->id, ((RRDSET *)b)->id);
 126 }
 127
 128 #define rrdset_index_add(host, st) (RRDSET *)avl_insert_lock(&((host)->rrdset_root_index), (avl *)(st))
 129 #define rrdset_index_del(host, st) (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index), (avl *)(st))
 130
 131 static RRDSET *rrdset_index_find(RRDHOST *host, const char *id, uint32_t hash) {
 132     RRDSET tmp;
 133     strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
 134     tmp.hash = (hash)?hash:simple_hash(tmp.id);
 135
 136     return (RRDSET *)avl_search_lock(&(host->rrdset_root_index), (avl *) &tmp);
 137 }
 138
 139 // ----------------------------------------------------------------------------
 140 // RRDSET name index
 141
 142 #define rrdset_from_avlname(avlname_ptr) ((RRDSET *)((avlname_ptr) - offsetof(RRDSET, avlname)))
 143
 144 static int rrdset_compare_name(void* a, void* b) {
 145     RRDSET *A = rrdset_from_avlname(a);
 146     RRDSET *B = rrdset_from_avlname(b);
 147
 148     // fprintf(stderr, "COMPARING: %s with %s\n", A->name, B->name);
 149
 150     if(A->hash_name < B->hash_name) return -1;
 151     else if(A->hash_name > B->hash_name) return 1;
 152     else return strcmp(A->name, B->name);
 153 }
 154
 155 RRDSET *rrdset_index_add_name(RRDHOST *host, RRDSET *st) {
 156     void *result;
 157     // fprintf(stderr, "ADDING: %s (name: %s)\n", st->id, st->name);
 158     result = avl_insert_lock(&host->rrdset_root_index_name, (avl *) (&st->avlname));
 159     if(result) return rrdset_from_avlname(result);
 160     return NULL;
 161 }
 162
 163 RRDSET *rrdset_index_del_name(RRDHOST *host, RRDSET *st) {
 164     void *result;
 165     // fprintf(stderr, "DELETING: %s (name: %s)\n", st->id, st->name);
 166     return (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index_name), (avl *)(&st->avlname));
 167     if(result) return rrdset_from_avlname(result);
 168     return NULL;
 169 }
 170
 171 static RRDSET *rrdset_index_find_name(RRDHOST *host, const char *name, uint32_t hash) {
 172     void *result = NULL;
 173     RRDSET tmp;
 174     tmp.name = name;
 175     tmp.hash_name = (hash)?hash:simple_hash(tmp.name);
 176
 177     // fprintf(stderr, "SEARCHING: %s\n", name);
 178     result = avl_search_lock(&host->rrdset_root_index_name, (avl *) (&(tmp.avlname)));
 179     if(result) {
 180         RRDSET *st = rrdset_from_avlname(result);
 181         if(strcmp(st->magic, RRDSET_MAGIC))
 182             error("Search for RRDSET %s returned an invalid RRDSET %s (name %s)", name, st->id, st->name);
 183
 184         // fprintf(stderr, "FOUND: %s\n", name);
 185         return rrdset_from_avlname(result);
 186     }
 187     // fprintf(stderr, "NOT FOUND: %s\n", name);
 188     return NULL;
 189 }
 190
 191
 192 // ----------------------------------------------------------------------------
 193 // RRDDIM index
 194
 195 static int rrddim_compare(void* a, void* b) {
 196     if(((RRDDIM *)a)->hash < ((RRDDIM *)b)->hash) return -1;
 197     else if(((RRDDIM *)a)->hash > ((RRDDIM *)b)->hash) return 1;
 198     else return strcmp(((RRDDIM *)a)->id, ((RRDDIM *)b)->id);
 199 }
 200
 201 #define rrddim_index_add(st, rd) avl_insert_lock(&((st)->dimensions_index), (avl *)(rd))
 202 #define rrddim_index_del(st,rd ) avl_remove_lock(&((st)->dimensions_index), (avl *)(rd))
 203
 204 static RRDDIM *rrddim_index_find(RRDSET *st, const char *id, uint32_t hash) {
 205     RRDDIM tmp;
 206     strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
 207     tmp.hash = (hash)?hash:simple_hash(tmp.id);
 208
 209     return (RRDDIM *)avl_search_lock(&(st->dimensions_index), (avl *) &tmp);
 210 }
 211
 212 // ----------------------------------------------------------------------------
 213 // chart types
 214
 215 int rrdset_type_id(const char *name)
 216 {
 217     if(unlikely(strcmp(name, RRDSET_TYPE_AREA_NAME) == 0)) return RRDSET_TYPE_AREA;
 218     else if(unlikely(strcmp(name, RRDSET_TYPE_STACKED_NAME) == 0)) return RRDSET_TYPE_STACKED;
 219     else if(unlikely(strcmp(name, RRDSET_TYPE_LINE_NAME) == 0)) return RRDSET_TYPE_LINE;
 220     return RRDSET_TYPE_LINE;
 221 }
 222
 223 const char *rrdset_type_name(int chart_type)
 224 {
 225     static char line[] = RRDSET_TYPE_LINE_NAME;
 226     static char area[] = RRDSET_TYPE_AREA_NAME;
 227     static char stacked[] = RRDSET_TYPE_STACKED_NAME;
 228
 229     switch(chart_type) {
 230         case RRDSET_TYPE_LINE:
 231             return line;
 232
 233         case RRDSET_TYPE_AREA:
 234             return area;
 235
 236         case RRDSET_TYPE_STACKED:
 237             return stacked;
 238     }
 239     return line;
 240 }
 241
 242 // ----------------------------------------------------------------------------
 243 // load / save
 244
 245 const char *rrd_memory_mode_name(int id)
 246 {
 247     static const char ram[] = RRD_MEMORY_MODE_RAM_NAME;
 248     static const char map[] = RRD_MEMORY_MODE_MAP_NAME;
 249     static const char save[] = RRD_MEMORY_MODE_SAVE_NAME;
 250
 251     switch(id) {
 252         case RRD_MEMORY_MODE_RAM:
 253             return ram;
 254
 255         case RRD_MEMORY_MODE_MAP:
 256             return map;
 257
 258         case RRD_MEMORY_MODE_SAVE:
 259         default:
 260             return save;
 261     }
 262
 263     return save;
 264 }
 265
 266 int rrd_memory_mode_id(const char *name)
 267 {
 268     if(unlikely(!strcmp(name, RRD_MEMORY_MODE_RAM_NAME)))
 269         return RRD_MEMORY_MODE_RAM;
 270     else if(unlikely(!strcmp(name, RRD_MEMORY_MODE_MAP_NAME)))
 271         return RRD_MEMORY_MODE_MAP;
 272
 273     return RRD_MEMORY_MODE_SAVE;
 274 }
 275
 276 // ----------------------------------------------------------------------------
 277 // algorithms types
 278
 279 int rrddim_algorithm_id(const char *name)
 280 {
 281     if(strcmp(name, RRDDIM_INCREMENTAL_NAME) == 0)          return RRDDIM_INCREMENTAL;
 282     if(strcmp(name, RRDDIM_ABSOLUTE_NAME) == 0)             return RRDDIM_ABSOLUTE;
 283     if(strcmp(name, RRDDIM_PCENT_OVER_ROW_TOTAL_NAME) == 0)         return RRDDIM_PCENT_OVER_ROW_TOTAL;
 284     if(strcmp(name, RRDDIM_PCENT_OVER_DIFF_TOTAL_NAME) == 0)    return RRDDIM_PCENT_OVER_DIFF_TOTAL;
 285     return RRDDIM_ABSOLUTE;
 286 }
 287
 288 const char *rrddim_algorithm_name(int chart_type)
 289 {
 290     static char absolute[] = RRDDIM_ABSOLUTE_NAME;
 291     static char incremental[] = RRDDIM_INCREMENTAL_NAME;
 292     static char percentage_of_absolute_row[] = RRDDIM_PCENT_OVER_ROW_TOTAL_NAME;
 293     static char percentage_of_incremental_row[] = RRDDIM_PCENT_OVER_DIFF_TOTAL_NAME;
 294
 295     switch(chart_type) {
 296         case RRDDIM_ABSOLUTE:
 297             return absolute;
 298
 299         case RRDDIM_INCREMENTAL:
 300             return incremental;
 301
 302         case RRDDIM_PCENT_OVER_ROW_TOTAL:
 303             return percentage_of_absolute_row;
 304
 305         case RRDDIM_PCENT_OVER_DIFF_TOTAL:
 306             return percentage_of_incremental_row;
 307     }
 308     return absolute;
 309 }
 310
 311 // ----------------------------------------------------------------------------
 312 // chart names
 313
 314 char *rrdset_strncpyz_name(char *to, const char *from, size_t length)
 315 {
 316     char c, *p = to;
 317
 318     while (length-- && (c = *from++)) {
 319         if(c != '.' && !isalnum(c))
 320             c = '_';
 321
 322         *p++ = c;
 323     }
 324
 325     *p = '\0';
 326
 327     return to;
 328 }
 329
 330 void rrdset_set_name(RRDSET *st, const char *name)
 331 {
 332     debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, name);
 333
 334     if(st->name) {
 335         rrdset_index_del_name(&localhost, st);
 336         rrdsetvar_rename_all(st);
 337     }
 338
 339     char b[CONFIG_MAX_VALUE + 1];
 340     char n[RRD_ID_LENGTH_MAX + 1];
 341
 342     snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
 343     rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
 344     st->name = config_get(st->id, "name", b);
 345     st->hash_name = simple_hash(st->name);
 346
 347     rrdset_index_add_name(&localhost, st);
 348 }
 349
 350 // ----------------------------------------------------------------------------
 351 // cache directory
 352
 353 char *rrdset_cache_dir(const char *id)
 354 {
 355     char *ret = NULL;
 356
 357     static char *cache_dir = NULL;
 358     if(!cache_dir) {
 359         cache_dir = config_get("global", "cache directory", CACHE_DIR);
 360         int r = mkdir(cache_dir, 0755);
 361         if(r != 0 && errno != EEXIST)
 362             error("Cannot create directory '%s'", cache_dir);
 363     }
 364
 365     char b[FILENAME_MAX + 1];
 366     char n[FILENAME_MAX + 1];
 367     rrdset_strncpyz_name(b, id, FILENAME_MAX);
 368
 369     snprintfz(n, FILENAME_MAX, "%s/%s", cache_dir, b);
 370     ret = config_get(id, "cache directory", n);
 371
 372     if(rrd_memory_mode == RRD_MEMORY_MODE_MAP || rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 373         int r = mkdir(ret, 0775);
 374         if(r != 0 && errno != EEXIST)
 375             error("Cannot create directory '%s'", ret);
 376     }
 377
 378     return ret;
 379 }
 380
 381 // ----------------------------------------------------------------------------
 382 // core functions
 383
 384 void rrdset_reset(RRDSET *st)
 385 {
 386     debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
 387
 388     st->last_collected_time.tv_sec = 0;
 389     st->last_collected_time.tv_usec = 0;
 390     st->last_updated.tv_sec = 0;
 391     st->last_updated.tv_usec = 0;
 392     st->current_entry = 0;
 393     st->counter = 0;
 394     st->counter_done = 0;
 395
 396     RRDDIM *rd;
 397     for(rd = st->dimensions; rd ; rd = rd->next) {
 398         rd->last_collected_time.tv_sec = 0;
 399         rd->last_collected_time.tv_usec = 0;
 400         rd->counter = 0;
 401         bzero(rd->values, rd->entries * sizeof(storage_number));
 402     }
 403 }
 404
 405 RRDSET *rrdset_create(const char *type, const char *id, const char *name, const char *family, const char *context, const char *title, const char *units, long priority, int update_every, int chart_type)
 406 {
 407     if(!type || !type[0]) {
 408         fatal("Cannot create rrd stats without a type.");
 409         return NULL;
 410     }
 411
 412     if(!id || !id[0]) {
 413         fatal("Cannot create rrd stats without an id.");
 414         return NULL;
 415     }
 416
 417     char fullid[RRD_ID_LENGTH_MAX + 1];
 418     char fullfilename[FILENAME_MAX + 1];
 419     RRDSET *st = NULL;
 420
 421     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 422
 423     st = rrdset_find(fullid);
 424     if(st) {
 425         error("Cannot create rrd stats for '%s', it already exists.", fullid);
 426         return st;
 427     }
 428
 429     long entries = config_get_number(fullid, "history", rrd_default_history_entries);
 430     if(entries < 5) entries = config_set_number(fullid, "history", 5);
 431     if(entries > RRD_HISTORY_ENTRIES_MAX) entries = config_set_number(fullid, "history", RRD_HISTORY_ENTRIES_MAX);
 432
 433     int enabled = config_get_boolean(fullid, "enabled", 1);
 434     if(!enabled) entries = 5;
 435
 436     unsigned long size = sizeof(RRDSET);
 437     char *cache_dir = rrdset_cache_dir(fullid);
 438
 439     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 440
 441     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 442     if(rrd_memory_mode != RRD_MEMORY_MODE_RAM) st = (RRDSET *)mymmap(fullfilename, size, ((rrd_memory_mode == RRD_MEMORY_MODE_MAP)?MAP_SHARED:MAP_PRIVATE), 0);
 443     if(st) {
 444         if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 445             errno = 0;
 446             info("Initializing file %s.", fullfilename);
 447             bzero(st, size);
 448         }
 449         else if(strcmp(st->id, fullid) != 0) {
 450             errno = 0;
 451             error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 452             // munmap(st, size);
 453             // st = NULL;
 454             bzero(st, size);
 455         }
 456         else if(st->memsize != size || st->entries != entries) {
 457             errno = 0;
 458             error("File %s does not have the desired size. Clearing it.", fullfilename);
 459             bzero(st, size);
 460         }
 461         else if(st->update_every != update_every) {
 462             errno = 0;
 463             error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 464             bzero(st, size);
 465         }
 466         else if((time(NULL) - st->last_updated.tv_sec) > update_every * entries) {
 467             errno = 0;
 468             error("File %s is too old. Clearing it.", fullfilename);
 469             bzero(st, size);
 470         }
 471     }
 472
 473     if(st) {
 474         st->name = NULL;
 475         st->type = NULL;
 476         st->family = NULL;
 477         st->context = NULL;
 478         st->title = NULL;
 479         st->units = NULL;
 480         st->dimensions = NULL;
 481         st->next = NULL;
 482         st->mapped = rrd_memory_mode;
 483         st->variables = NULL;
 484     }
 485     else {
 486         st = callocz(1, size);
 487         st->mapped = RRD_MEMORY_MODE_RAM;
 488     }
 489     st->memsize = size;
 490     st->entries = entries;
 491     st->update_every = update_every;
 492
 493     if(st->current_entry >= st->entries) st->current_entry = 0;
 494
 495     strcpy(st->cache_filename, fullfilename);
 496     strcpy(st->magic, RRDSET_MAGIC);
 497
 498     strcpy(st->id, fullid);
 499     st->hash = simple_hash(st->id);
 500
 501     st->cache_dir = cache_dir;
 502
 503     st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
 504     st->type       = config_get(st->id, "type", type);
 505     st->family     = config_get(st->id, "family", family?family:st->type);
 506     st->context    = config_get(st->id, "context", context?context:st->id);
 507     st->units      = config_get(st->id, "units", units?units:"");
 508
 509     st->priority = config_get_number(st->id, "priority", priority);
 510     st->enabled = enabled;
 511
 512     st->isdetail = 0;
 513     st->debug = 0;
 514
 515     st->last_collected_time.tv_sec = 0;
 516     st->last_collected_time.tv_usec = 0;
 517     st->counter_done = 0;
 518
 519     st->gap_when_lost_iterations_above = (int) (
 520             config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 521
 522     avl_init_lock(&st->dimensions_index, rrddim_compare);
 523     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 524
 525     pthread_rwlock_init(&st->rwlock, NULL);
 526     pthread_rwlock_wrlock(&localhost.rrdset_root_rwlock);
 527
 528     if(name && *name) rrdset_set_name(st, name);
 529     else rrdset_set_name(st, id);
 530
 531     {
 532         char varvalue[CONFIG_MAX_VALUE + 1];
 533         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 534         st->title = config_get(st->id, "title", varvalue);
 535     }
 536
 537     st->rrdcontext = rrdcontext_create(st->context);
 538     st->rrdhost = &localhost;
 539
 540     st->next = localhost.rrdset_root;
 541     localhost.rrdset_root = st;
 542
 543     rrdsetvar_create(st, "last_collected", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 544     rrdsetvar_create(st, "raw_total", RRDVAR_TYPE_TOTAL, &st->collected_total, 0);
 545
 546     rrdset_index_add(&localhost, st);
 547
 548     rrdsetcalc_link_matching(st);
 549
 550     pthread_rwlock_unlock(&localhost.rrdset_root_rwlock);
 551
 552     return(st);
 553 }
 554
 555 RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
 556 {
 557     char filename[FILENAME_MAX + 1];
 558     char fullfilename[FILENAME_MAX + 1];
 559
 560     char varname[CONFIG_MAX_NAME + 1];
 561     RRDDIM *rd = NULL;
 562     unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
 563
 564     debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
 565
 566     rrdset_strncpyz_name(filename, id, FILENAME_MAX);
 567     snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
 568     if(rrd_memory_mode != RRD_MEMORY_MODE_RAM) rd = (RRDDIM *)mymmap(fullfilename, size, ((rrd_memory_mode == RRD_MEMORY_MODE_MAP)?MAP_SHARED:MAP_PRIVATE), 1);
 569     if(rd) {
 570         struct timeval now;
 571         gettimeofday(&now, NULL);
 572
 573         if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
 574             errno = 0;
 575             info("Initializing file %s.", fullfilename);
 576             bzero(rd, size);
 577         }
 578         else if(rd->memsize != size) {
 579             errno = 0;
 580             error("File %s does not have the desired size. Clearing it.", fullfilename);
 581             bzero(rd, size);
 582         }
 583         else if(rd->multiplier != multiplier) {
 584             errno = 0;
 585             error("File %s does not have the same multiplier. Clearing it.", fullfilename);
 586             bzero(rd, size);
 587         }
 588         else if(rd->divisor != divisor) {
 589             errno = 0;
 590             error("File %s does not have the same divisor. Clearing it.", fullfilename);
 591             bzero(rd, size);
 592         }
 593         else if(rd->algorithm != algorithm) {
 594             errno = 0;
 595             error("File %s does not have the same algorithm. Clearing it.", fullfilename);
 596             bzero(rd, size);
 597         }
 598         else if(rd->update_every != st->update_every) {
 599             errno = 0;
 600             error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
 601             bzero(rd, size);
 602         }
 603         else if(usec_dt(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * 1000000ULL)) {
 604             errno = 0;
 605             error("File %s is too old. Clearing it.", fullfilename);
 606             bzero(rd, size);
 607         }
 608         else if(strcmp(rd->id, id) != 0) {
 609             errno = 0;
 610             error("File %s contents are not for dimension %s. Clearing it.", fullfilename, id);
 611             // munmap(rd, size);
 612             // rd = NULL;
 613             bzero(rd, size);
 614         }
 615     }
 616
 617     if(rd) {
 618         // we have a file mapped for rd
 619         rd->mapped = rrd_memory_mode;
 620         rd->flags = 0x00000000;
 621         rd->variables = NULL;
 622         rd->next = NULL;
 623         rd->name = NULL;
 624     }
 625     else {
 626         // if we didn't manage to get a mmap'd dimension, just create one
 627
 628         rd = callocz(1, size);
 629         rd->mapped = RRD_MEMORY_MODE_RAM;
 630     }
 631     rd->memsize = size;
 632
 633     strcpy(rd->magic, RRDDIMENSION_MAGIC);
 634     strcpy(rd->cache_filename, fullfilename);
 635     strncpyz(rd->id, id, RRD_ID_LENGTH_MAX);
 636     rd->hash = simple_hash(rd->id);
 637
 638     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 639     rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
 640
 641     snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
 642     rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
 643
 644     snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
 645     rd->multiplier = config_get_number(st->id, varname, multiplier);
 646
 647     snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
 648     rd->divisor = config_get_number(st->id, varname, divisor);
 649     if(!rd->divisor) rd->divisor = 1;
 650
 651     rd->entries = st->entries;
 652     rd->update_every = st->update_every;
 653
 654     // prevent incremental calculation spikes
 655     rd->counter = 0;
 656     rd->updated = 0;
 657     rd->calculated_value = 0;
 658     rd->last_calculated_value = 0;
 659     rd->collected_value = 0;
 660     rd->last_collected_value = 0;
 661     rd->collected_volume = 0;
 662     rd->stored_volume = 0;
 663     rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 664     rd->last_collected_time.tv_sec = 0;
 665     rd->last_collected_time.tv_usec = 0;
 666     rd->rrdset = st;
 667
 668     // append this dimension
 669     pthread_rwlock_wrlock(&st->rwlock);
 670     if(!st->dimensions)
 671         st->dimensions = rd;
 672     else {
 673         RRDDIM *td = st->dimensions;
 674         for(; td->next; td = td->next) ;
 675         td->next = rd;
 676     }
 677
 678     rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->calculated_value, 0);
 679     rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->collected_value, 0);
 680     rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected", &rd->last_collected_time.tv_sec, 0);
 681
 682     pthread_rwlock_unlock(&st->rwlock);
 683
 684     rrddim_index_add(st, rd);
 685
 686     return(rd);
 687 }
 688
 689 void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
 690 {
 691     debug(D_RRD_CALLS, "rrddim_set_name() %s.%s", st->name, rd->name);
 692
 693     char varname[CONFIG_MAX_NAME + 1];
 694     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 695     config_set_default(st->id, varname, name);
 696
 697     rrddimvar_rename_all(rd);
 698 }
 699
 700 void rrddim_free(RRDSET *st, RRDDIM *rd)
 701 {
 702     debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
 703
 704     RRDDIM *i, *last = NULL;
 705     for(i = st->dimensions; i && i != rd ; i = i->next) last = i;
 706
 707     if(!i) {
 708         error("Request to free dimension %s.%s but it is not linked.", st->id, rd->name);
 709         return;
 710     }
 711
 712     if(last) last->next = rd->next;
 713     else st->dimensions = rd->next;
 714     rd->next = NULL;
 715
 716     while(rd->variables)
 717         rrddimvar_free(rd->variables);
 718
 719     rrddim_index_del(st, rd);
 720
 721     // free(rd->annotations);
 722     if(rd->mapped == RRD_MEMORY_MODE_SAVE) {
 723         debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 724         savememory(rd->cache_filename, rd, rd->memsize);
 725
 726         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 727         munmap(rd, rd->memsize);
 728     }
 729     else if(rd->mapped == RRD_MEMORY_MODE_MAP) {
 730         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 731         munmap(rd, rd->memsize);
 732     }
 733     else {
 734         debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
 735         freez(rd);
 736     }
 737 }
 738
 739 void rrdset_free_all(void)
 740 {
 741     info("Freeing all memory...");
 742
 743     pthread_rwlock_wrlock(&localhost.rrdset_root_rwlock);
 744
 745     RRDSET *st;
 746     for(st = localhost.rrdset_root; st ;) {
 747         RRDSET *next = st->next;
 748
 749         pthread_rwlock_wrlock(&st->rwlock);
 750
 751         while(st->variables)
 752             rrdsetvar_free(st->variables);
 753
 754         while(st->calculations)
 755             rrdsetcalc_unlink(st->calculations);
 756
 757         while(st->dimensions)
 758             rrddim_free(st, st->dimensions);
 759
 760         rrdset_index_del(&localhost, st);
 761
 762         st->rrdcontext->use_count--;
 763         if(!st->rrdcontext->use_count)
 764             rrdcontext_free(st->rrdcontext);
 765
 766         pthread_rwlock_unlock(&st->rwlock);
 767
 768         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 769             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 770             savememory(st->cache_filename, st, st->memsize);
 771
 772             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 773             munmap(st, st->memsize);
 774         }
 775         else if(st->mapped == RRD_MEMORY_MODE_MAP) {
 776             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 777             munmap(st, st->memsize);
 778         }
 779         else
 780             freez(st);
 781
 782         st = next;
 783     }
 784     localhost.rrdset_root = NULL;
 785
 786     pthread_rwlock_unlock(&localhost.rrdset_root_rwlock);
 787
 788     info("Memory cleanup completed...");
 789 }
 790
 791 void rrdset_save_all(void) {
 792     info("Saving database...");
 793
 794     RRDSET *st;
 795     RRDDIM *rd;
 796
 797     pthread_rwlock_wrlock(&localhost.rrdset_root_rwlock);
 798     for(st = localhost.rrdset_root; st ; st = st->next) {
 799         pthread_rwlock_wrlock(&st->rwlock);
 800
 801         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 802             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 803             savememory(st->cache_filename, st, st->memsize);
 804         }
 805
 806         for(rd = st->dimensions; rd ; rd = rd->next) {
 807             if(likely(rd->mapped == RRD_MEMORY_MODE_SAVE)) {
 808                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 809                 savememory(rd->cache_filename, rd, rd->memsize);
 810             }
 811         }
 812
 813         pthread_rwlock_unlock(&st->rwlock);
 814     }
 815     pthread_rwlock_unlock(&localhost.rrdset_root_rwlock);
 816 }
 817
 818
 819 RRDSET *rrdset_find(const char *id)
 820 {
 821     debug(D_RRD_CALLS, "rrdset_find() for chart %s", id);
 822
 823     RRDSET *st = rrdset_index_find(&localhost, id, 0);
 824     return(st);
 825 }
 826
 827 RRDSET *rrdset_find_bytype(const char *type, const char *id)
 828 {
 829     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart %s.%s", type, id);
 830
 831     char buf[RRD_ID_LENGTH_MAX + 1];
 832
 833     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 834     strcat(buf, ".");
 835     int len = (int) strlen(buf);
 836     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 837
 838     return(rrdset_find(buf));
 839 }
 840
 841 RRDSET *rrdset_find_byname(const char *name)
 842 {
 843     debug(D_RRD_CALLS, "rrdset_find_byname() for chart %s", name);
 844
 845     RRDSET *st = rrdset_index_find_name(&localhost, name, 0);
 846     return(st);
 847 }
 848
 849 RRDDIM *rrddim_find(RRDSET *st, const char *id)
 850 {
 851     debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
 852
 853     return rrddim_index_find(st, id, 0);
 854 }
 855
 856 int rrddim_hide(RRDSET *st, const char *id)
 857 {
 858     debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
 859
 860     RRDDIM *rd = rrddim_find(st, id);
 861     if(unlikely(!rd)) {
 862         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 863         return 1;
 864     }
 865
 866     rd->flags |= RRDDIM_FLAG_HIDDEN;
 867     return 0;
 868 }
 869
 870 int rrddim_unhide(RRDSET *st, const char *id)
 871 {
 872     debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
 873
 874     RRDDIM *rd = rrddim_find(st, id);
 875     if(unlikely(!rd)) {
 876         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 877         return 1;
 878     }
 879
 880     if(rd->flags & RRDDIM_FLAG_HIDDEN) rd->flags ^= RRDDIM_FLAG_HIDDEN;
 881     return 0;
 882 }
 883
 884 collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
 885 {
 886     debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
 887
 888     gettimeofday(&rd->last_collected_time, NULL);
 889     rd->collected_value = value;
 890     rd->updated = 1;
 891     rd->counter++;
 892
 893     return rd->last_collected_value;
 894 }
 895
 896 collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
 897 {
 898     RRDDIM *rd = rrddim_find(st, id);
 899     if(unlikely(!rd)) {
 900         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 901         return 0;
 902     }
 903
 904     return rrddim_set_by_pointer(st, rd, value);
 905 }
 906
 907 void rrdset_next_usec(RRDSET *st, unsigned long long microseconds)
 908 {
 909     if(!microseconds) rrdset_next(st);
 910     else {
 911         debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
 912
 913         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
 914         st->usec_since_last_update = microseconds;
 915     }
 916 }
 917
 918 void rrdset_next(RRDSET *st)
 919 {
 920     unsigned long long microseconds = 0;
 921
 922     if(likely(st->last_collected_time.tv_sec)) {
 923         struct timeval now;
 924         gettimeofday(&now, NULL);
 925         microseconds = usec_dt(&now, &st->last_collected_time);
 926     }
 927     // prevent infinite loop
 928     else microseconds = st->update_every * 1000000ULL;
 929
 930     rrdset_next_usec(st, microseconds);
 931 }
 932
 933 void rrdset_next_plugins(RRDSET *st)
 934 {
 935     rrdset_next(st);
 936 }
 937
 938 unsigned long long rrdset_done(RRDSET *st)
 939 {
 940     if(unlikely(netdata_exit)) return 0;
 941
 942     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
 943
 944     RRDDIM *rd, *last;
 945     int oldstate, store_this_entry = 1, first_entry = 0;
 946     unsigned long long last_ut, now_ut, next_ut, stored_entries = 0;
 947
 948     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldstate) != 0))
 949         error("Cannot set pthread cancel state to DISABLE.");
 950
 951     // a read lock is OK here
 952     pthread_rwlock_rdlock(&st->rwlock);
 953
 954     // enable the chart, if it was disabled
 955     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
 956         st->enabled = 1;
 957
 958     // check if the chart has a long time to be updated
 959     if(unlikely(st->usec_since_last_update > st->entries * st->update_every * 1000000ULL)) {
 960         info("%s: took too long to be updated (%0.3Lf secs). Reseting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
 961         rrdset_reset(st);
 962         st->usec_since_last_update = st->update_every * 1000000ULL;
 963         first_entry = 1;
 964     }
 965     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
 966
 967     // set last_collected_time
 968     if(unlikely(!st->last_collected_time.tv_sec)) {
 969         // it is the first entry
 970         // set the last_collected_time to now
 971         gettimeofday(&st->last_collected_time, NULL);
 972
 973         // the first entry should not be stored
 974         store_this_entry = 0;
 975         first_entry = 1;
 976
 977         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: has not set last_collected_time. Setting it now. Will not store the next entry.", st->name);
 978     }
 979     else {
 980         // it is not the first entry
 981         // calculate the proper last_collected_time, using usec_since_last_update
 982         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec + st->usec_since_last_update;
 983         st->last_collected_time.tv_sec = (time_t) (ut / 1000000ULL);
 984         st->last_collected_time.tv_usec = (suseconds_t) (ut % 1000000ULL);
 985     }
 986
 987     // if this set has not been updated in the past
 988     // we fake the last_update time to be = now - usec_since_last_update
 989     if(unlikely(!st->last_updated.tv_sec)) {
 990         // it has never been updated before
 991         // set a fake last_updated, in the past using usec_since_last_update
 992         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
 993         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
 994         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
 995
 996         // the first entry should not be stored
 997         store_this_entry = 0;
 998         first_entry = 1;
 999
1000         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: initializing last_updated to now - %llu microseconds (%0.3Lf). Will not store the next entry.", st->name, st->usec_since_last_update, (long double)ut/1000000.0);
1001     }
1002
1003     // check if we will re-write the entire data set
1004     if(unlikely(usec_dt(&st->last_collected_time, &st->last_updated) > st->update_every * st->entries * 1000000ULL)) {
1005         info("%s: too old data (last updated at %ld.%ld, last collected at %ld.%ld). Reseting it. Will not store the next entry.", st->name, st->last_updated.tv_sec, st->last_updated.tv_usec, st->last_collected_time.tv_sec, st->last_collected_time.tv_usec);
1006         rrdset_reset(st);
1007
1008         st->usec_since_last_update = st->update_every * 1000000ULL;
1009
1010         gettimeofday(&st->last_collected_time, NULL);
1011
1012         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
1013         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
1014         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
1015
1016         // the first entry should not be stored
1017         store_this_entry = 0;
1018         first_entry = 1;
1019     }
1020
1021     // these are the 3 variables that will help us in interpolation
1022     // last_ut = the last time we added a value to the storage
1023     //  now_ut = the time the current value is taken at
1024     // next_ut = the time of the next interpolation point
1025     last_ut = st->last_updated.tv_sec * 1000000ULL + st->last_updated.tv_usec;
1026     now_ut  = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
1027     next_ut = (st->last_updated.tv_sec + st->update_every) * 1000000ULL;
1028
1029     if(unlikely(!first_entry && now_ut < next_ut)) {
1030         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1031     }
1032
1033     if(unlikely(st->debug)) {
1034         debug(D_RRD_STATS, "%s: last ut = %0.3Lf (last updated time)", st->name, (long double)last_ut/1000000.0);
1035         debug(D_RRD_STATS, "%s: now  ut = %0.3Lf (current update time)", st->name, (long double)now_ut/1000000.0);
1036         debug(D_RRD_STATS, "%s: next ut = %0.3Lf (next interpolation point)", st->name, (long double)next_ut/1000000.0);
1037     }
1038
1039     if(unlikely(!st->counter_done)) {
1040         store_this_entry = 0;
1041         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
1042     }
1043     st->counter_done++;
1044
1045     // calculate totals and count the dimensions
1046     int dimensions;
1047     st->collected_total = 0;
1048     for( rd = st->dimensions, dimensions = 0 ; likely(rd) ; rd = rd->next, dimensions++ )
1049         if(likely(rd->updated)) st->collected_total += rd->collected_value;
1050
1051     uint32_t storage_flags = SN_EXISTS;
1052
1053     // process all dimensions to calculate their values
1054     // based on the collected figures only
1055     // at this stage we do not interpolate anything
1056     for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1057
1058         if(unlikely(!rd->updated)) {
1059             rd->calculated_value = 0;
1060             continue;
1061         }
1062
1063         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
1064             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1065             " collected_value = " COLLECTED_NUMBER_FORMAT
1066             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1067             " calculated_value = " CALCULATED_NUMBER_FORMAT
1068             , st->id, rd->name
1069             , rd->last_collected_value
1070             , rd->collected_value
1071             , rd->last_calculated_value
1072             , rd->calculated_value
1073             );
1074
1075         switch(rd->algorithm) {
1076             case RRDDIM_ABSOLUTE:
1077                 rd->calculated_value = (calculated_number)rd->collected_value
1078                     * (calculated_number)rd->multiplier
1079                     / (calculated_number)rd->divisor;
1080
1081                 if(unlikely(st->debug))
1082                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
1083                         CALCULATED_NUMBER_FORMAT " = "
1084                         COLLECTED_NUMBER_FORMAT
1085                         " * " CALCULATED_NUMBER_FORMAT
1086                         " / " CALCULATED_NUMBER_FORMAT
1087                         , st->id, rd->name
1088                         , rd->calculated_value
1089                         , rd->collected_value
1090                         , (calculated_number)rd->multiplier
1091                         , (calculated_number)rd->divisor
1092                         );
1093                 break;
1094
1095             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1096                 if(unlikely(!st->collected_total))
1097                     rd->calculated_value = 0;
1098                 else
1099                     // the percentage of the current value
1100                     // over the total of all dimensions
1101                     rd->calculated_value =
1102                           (calculated_number)100
1103                         * (calculated_number)rd->collected_value
1104                         / (calculated_number)st->collected_total;
1105
1106                 if(unlikely(st->debug))
1107                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
1108                         CALCULATED_NUMBER_FORMAT " = 100"
1109                         " * " COLLECTED_NUMBER_FORMAT
1110                         " / " COLLECTED_NUMBER_FORMAT
1111                         , st->id, rd->name
1112                         , rd->calculated_value
1113                         , rd->collected_value
1114                         , st->collected_total
1115                         );
1116                 break;
1117
1118             case RRDDIM_INCREMENTAL:
1119                 if(unlikely(rd->counter <= 1)) {
1120                     rd->calculated_value = 0;
1121                     continue;
1122                 }
1123
1124                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1125                 // to reset the calculation (it will give zero as the calculation for this second)
1126                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1127                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1128                             , st->name, rd->name
1129                             , rd->last_collected_value
1130                             , rd->collected_value);
1131                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1132                     rd->last_collected_value = rd->collected_value;
1133                 }
1134
1135                 rd->calculated_value =
1136                       (calculated_number)(rd->collected_value - rd->last_collected_value)
1137                     * (calculated_number)rd->multiplier
1138                     / (calculated_number)rd->divisor;
1139
1140                 if(unlikely(st->debug))
1141                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
1142                         CALCULATED_NUMBER_FORMAT " = ("
1143                         COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
1144                         ")"
1145                         " * " CALCULATED_NUMBER_FORMAT
1146                         " / " CALCULATED_NUMBER_FORMAT
1147                         , st->id, rd->name
1148                         , rd->calculated_value
1149                         , rd->collected_value, rd->last_collected_value
1150                         , (calculated_number)rd->multiplier
1151                         , (calculated_number)rd->divisor
1152                         );
1153                 break;
1154
1155             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1156                 if(unlikely(rd->counter <= 1)) {
1157                     rd->calculated_value = 0;
1158                     continue;
1159                 }
1160
1161                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1162                 // to reset the calculation (it will give zero as the calculation for this second)
1163                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1164                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1165                     , st->name, rd->name
1166                     , rd->last_collected_value
1167                     , rd->collected_value);
1168                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1169                     rd->last_collected_value = rd->collected_value;
1170                 }
1171
1172                 // the percentage of the current increment
1173                 // over the increment of all dimensions together
1174                 if(unlikely(st->collected_total == st->last_collected_total))
1175                     rd->calculated_value = 0;
1176                 else
1177                     rd->calculated_value =
1178                           (calculated_number)100
1179                         * (calculated_number)(rd->collected_value - rd->last_collected_value)
1180                         / (calculated_number)(st->collected_total - st->last_collected_total);
1181
1182                 if(unlikely(st->debug))
1183                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
1184                         CALCULATED_NUMBER_FORMAT " = 100"
1185                         " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1186                         " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1187                         , st->id, rd->name
1188                         , rd->calculated_value
1189                         , rd->collected_value, rd->last_collected_value
1190                         , st->collected_total, st->last_collected_total
1191                         );
1192                 break;
1193
1194             default:
1195                 // make the default zero, to make sure
1196                 // it gets noticed when we add new types
1197                 rd->calculated_value = 0;
1198
1199                 if(unlikely(st->debug))
1200                     debug(D_RRD_STATS, "%s/%s: CALC "
1201                         CALCULATED_NUMBER_FORMAT " = 0"
1202                         , st->id, rd->name
1203                         , rd->calculated_value
1204                         );
1205                 break;
1206         }
1207
1208         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
1209             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1210             " collected_value = " COLLECTED_NUMBER_FORMAT
1211             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1212             " calculated_value = " CALCULATED_NUMBER_FORMAT
1213             , st->id, rd->name
1214             , rd->last_collected_value
1215             , rd->collected_value
1216             , rd->last_calculated_value
1217             , rd->calculated_value
1218             );
1219
1220     }
1221
1222     // at this point we have all the calculated values ready
1223     // it is now time to interpolate values on a second boundary
1224
1225     unsigned long long first_ut = last_ut;
1226     long long iterations = (now_ut - last_ut) / (st->update_every * 1000000ULL);
1227     if((now_ut % (st->update_every * 1000000ULL)) == 0) iterations++;
1228
1229     for( ; likely(next_ut <= now_ut) ; next_ut += st->update_every * 1000000ULL, iterations-- ) {
1230 #ifdef NETDATA_INTERNAL_CHECKS
1231         if(iterations < 0) { error("%s: iterations calculation wrapped! first_ut = %llu, last_ut = %llu, next_ut = %llu, now_ut = %llu", st->name, first_ut, last_ut, next_ut, now_ut); }
1232 #endif
1233
1234         if(unlikely(st->debug)) {
1235             debug(D_RRD_STATS, "%s: last ut = %0.3Lf (last updated time)", st->name, (long double)last_ut/1000000.0);
1236             debug(D_RRD_STATS, "%s: next ut = %0.3Lf (next interpolation point)", st->name, (long double)next_ut/1000000.0);
1237         }
1238
1239         st->last_updated.tv_sec = (time_t) (next_ut / 1000000ULL);
1240         st->last_updated.tv_usec = 0;
1241
1242         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1243             calculated_number new_value;
1244
1245             switch(rd->algorithm) {
1246                 case RRDDIM_INCREMENTAL:
1247                     new_value = (calculated_number)
1248                         (      rd->calculated_value
1249                             * (calculated_number)(next_ut - last_ut)
1250                             / (calculated_number)(now_ut - last_ut)
1251                         );
1252
1253                     if(unlikely(st->debug))
1254                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1255                             CALCULATED_NUMBER_FORMAT " = "
1256                             CALCULATED_NUMBER_FORMAT
1257                             " * %llu"
1258                             " / %llu"
1259                             , st->id, rd->name
1260                             , new_value
1261                             , rd->calculated_value
1262                             , (next_ut - last_ut)
1263                             , (now_ut - last_ut)
1264                             );
1265
1266                     rd->calculated_value -= new_value;
1267                     new_value += rd->last_calculated_value;
1268                     rd->last_calculated_value = 0;
1269                     new_value /= (calculated_number)st->update_every;
1270                     break;
1271
1272                 case RRDDIM_ABSOLUTE:
1273                 case RRDDIM_PCENT_OVER_ROW_TOTAL:
1274                 case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1275                 default:
1276                     if(iterations == 1) {
1277                         // this is the last iteration
1278                         // do not interpolate
1279                         // just show the calculated value
1280
1281                         new_value = rd->calculated_value;
1282                     }
1283                     else {
1284                         // we have missed an update
1285                         // interpolate in the middle values
1286
1287                         new_value = (calculated_number)
1288                             (   (     (rd->calculated_value - rd->last_calculated_value)
1289                                     * (calculated_number)(next_ut - first_ut)
1290                                     / (calculated_number)(now_ut - first_ut)
1291                                 )
1292                                 +  rd->last_calculated_value
1293                             );
1294
1295                         if(unlikely(st->debug))
1296                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1297                                 CALCULATED_NUMBER_FORMAT " = ((("
1298                                 "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1299                                 " * %llu"
1300                                 " / %llu) + " CALCULATED_NUMBER_FORMAT
1301                                 , st->id, rd->name
1302                                 , new_value
1303                                 , rd->calculated_value, rd->last_calculated_value
1304                                 , (next_ut - first_ut)
1305                                 , (now_ut - first_ut), rd->last_calculated_value
1306                                 );
1307
1308                         // this is wrong
1309                         // it fades the value towards the target
1310                         // while we know the calculated value is different
1311                         // if(likely(next_ut + st->update_every * 1000000ULL > now_ut)) rd->calculated_value = new_value;
1312                     }
1313                     break;
1314             }
1315
1316             if(unlikely(!store_this_entry)) {
1317                 store_this_entry = 1;
1318                 continue;
1319             }
1320
1321             if(likely(rd->updated && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1322                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1323
1324                 if(unlikely(st->debug))
1325                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1326                         CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1327                         , st->id, rd->name
1328                         , st->current_entry
1329                         , unpack_storage_number(rd->values[st->current_entry]), new_value
1330                         );
1331             }
1332             else {
1333                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1334                         , st->id, rd->name
1335                         , st->current_entry
1336                         );
1337                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1338             }
1339
1340             stored_entries++;
1341
1342             if(unlikely(st->debug)) {
1343                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1344                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1345                 calculated_number accuracy = accuracy_loss(t1, t2);
1346                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1347                         , st->id, rd->name
1348                         , st->current_entry
1349                         , t2
1350                         , get_storage_number_flags(rd->values[st->current_entry])
1351                         , t1
1352                         , accuracy
1353                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1354                         );
1355
1356                 rd->collected_volume += t1;
1357                 rd->stored_volume += t2;
1358                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1359                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1360                         , st->id, rd->name
1361                         , st->current_entry
1362                         , rd->stored_volume
1363                         , rd->collected_volume
1364                         , accuracy
1365                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1366                         );
1367
1368             }
1369         }
1370         // reset the storage flags for the next point, if any;
1371         storage_flags = SN_EXISTS;
1372
1373         st->counter++;
1374         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1375         last_ut = next_ut;
1376     }
1377
1378     // align next interpolation to last collection point
1379     if(likely(stored_entries || !store_this_entry)) {
1380         st->last_updated.tv_sec = st->last_collected_time.tv_sec;
1381         st->last_updated.tv_usec = st->last_collected_time.tv_usec;
1382         st->last_collected_total  = st->collected_total;
1383     }
1384
1385     for( rd = st->dimensions; likely(rd) ; rd = rd->next ) {
1386         if(unlikely(!rd->updated)) continue;
1387
1388         if(likely(stored_entries || !store_this_entry)) {
1389             if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: setting last_collected_value (old: " COLLECTED_NUMBER_FORMAT ") to last_collected_value (new: " COLLECTED_NUMBER_FORMAT ")", st->id, rd->name, rd->last_collected_value, rd->collected_value);
1390             rd->last_collected_value = rd->collected_value;
1391
1392             if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: setting last_calculated_value (old: " CALCULATED_NUMBER_FORMAT ") to last_calculated_value (new: " CALCULATED_NUMBER_FORMAT ")", st->id, rd->name, rd->last_calculated_value, rd->calculated_value);
1393             rd->last_calculated_value = rd->calculated_value;
1394         }
1395
1396         rd->calculated_value = 0;
1397         rd->collected_value = 0;
1398         rd->updated = 0;
1399
1400         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
1401             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1402             " collected_value = " COLLECTED_NUMBER_FORMAT
1403             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1404             " calculated_value = " CALCULATED_NUMBER_FORMAT
1405             , st->id, rd->name
1406             , rd->last_collected_value
1407             , rd->collected_value
1408             , rd->last_calculated_value
1409             , rd->calculated_value
1410             );
1411     }
1412
1413     // ALL DONE ABOUT THE DATA UPDATE
1414     // --------------------------------------------------------------------
1415
1416     // find if there are any obsolete dimensions (not updated recently)
1417     if(unlikely(rrd_delete_unupdated_dimensions)) {
1418
1419         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1420             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1421                 break;
1422
1423         if(unlikely(rd)) {
1424             // there is dimension to free
1425             // upgrade our read lock to a write lock
1426             pthread_rwlock_unlock(&st->rwlock);
1427             pthread_rwlock_wrlock(&st->rwlock);
1428
1429             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1430                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1431
1432                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1433                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1434
1435                     if(unlikely(!last)) {
1436                         st->dimensions = rd->next;
1437                         rd->next = NULL;
1438                         rrddim_free(st, rd);
1439                         rd = st->dimensions;
1440                         continue;
1441                     }
1442                     else {
1443                         last->next = rd->next;
1444                         rd->next = NULL;
1445                         rrddim_free(st, rd);
1446                         rd = last->next;
1447                         continue;
1448                     }
1449                 }
1450
1451                 last = rd;
1452                 rd = rd->next;
1453             }
1454
1455             if(unlikely(!st->dimensions)) {
1456                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1457                 st->enabled = 0;
1458             }
1459         }
1460     }
1461
1462     pthread_rwlock_unlock(&st->rwlock);
1463
1464     if(unlikely(pthread_setcancelstate(oldstate, NULL) != 0))
1465         error("Cannot set pthread cancel state to RESTORE (%d).", oldstate);
1466
1467     return(st->usec_since_last_update);
1468 }