src/plugin_checks.c

   1 #include "common.h"
   2
   3 void *checks_main(void *ptr) {
   4     struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
   5
   6     info("CHECKS thread created with task id %d", gettid());
   7
   8     if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
   9         error("Cannot set pthread cancel type to DEFERRED.");
  10
  11     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
  12         error("Cannot set pthread cancel state to ENABLE.");
  13
  14     usec_t usec = 0, susec = localhost->rrd_update_every * USEC_PER_SEC, loop_usec = 0, total_susec = 0;
  15     struct timeval now, last, loop;
  16
  17     RRDSET *check1, *check2, *check3, *apps_cpu = NULL;
  18
  19     check1 = rrdset_create_localhost("netdata", "check1", NULL, "netdata", NULL, "Caller gives microseconds"
  20                                      , "a million !", 99999, localhost->rrd_update_every, RRDSET_TYPE_LINE);
  21     rrddim_add(check1, "absolute", NULL, -1, 1, RRD_ALGORITHM_ABSOLUTE);
  22     rrddim_add(check1, "incremental", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
  23
  24     check2 = rrdset_create_localhost("netdata", "check2", NULL, "netdata", NULL, "Netdata calcs microseconds"
  25                                      , "a million !", 99999, localhost->rrd_update_every, RRDSET_TYPE_LINE);
  26     rrddim_add(check2, "absolute", NULL, -1, 1, RRD_ALGORITHM_ABSOLUTE);
  27     rrddim_add(check2, "incremental", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
  28
  29     check3 = rrdset_create_localhost("netdata", "checkdt", NULL, "netdata", NULL, "Clock difference"
  30                                      , "microseconds diff", 99999, localhost->rrd_update_every, RRDSET_TYPE_LINE);
  31     rrddim_add(check3, "caller", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
  32     rrddim_add(check3, "netdata", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
  33     rrddim_add(check3, "apps.plugin", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
  34
  35     now_realtime_timeval(&last);
  36     while(1) {
  37         usleep(susec);
  38
  39         // find the time to sleep in order to wait exactly update_every seconds
  40         now_realtime_timeval(&now);
  41         loop_usec = dt_usec(&now, &last);
  42         usec = loop_usec - susec;
  43         debug(D_PROCNETDEV_LOOP, "CHECK: last loop took %llu usec (worked for %llu, sleeped for %llu).", loop_usec, usec, susec);
  44
  45         if(usec < (localhost->rrd_update_every * USEC_PER_SEC / 2ULL)) susec = (localhost->rrd_update_every * USEC_PER_SEC) - usec;
  46         else susec = localhost->rrd_update_every * USEC_PER_SEC / 2ULL;
  47
  48         // --------------------------------------------------------------------
  49         // Calculate loop time
  50
  51         last.tv_sec = now.tv_sec;
  52         last.tv_usec = now.tv_usec;
  53         total_susec += loop_usec;
  54
  55         // --------------------------------------------------------------------
  56         // check chart 1
  57
  58         if(check1->counter_done) rrdset_next_usec(check1, loop_usec);
  59         rrddim_set(check1, "absolute", 1000000);
  60         rrddim_set(check1, "incremental", total_susec);
  61         rrdset_done(check1);
  62
  63         // --------------------------------------------------------------------
  64         // check chart 2
  65
  66         if(check2->counter_done) rrdset_next(check2);
  67         rrddim_set(check2, "absolute", 1000000);
  68         rrddim_set(check2, "incremental", total_susec);
  69         rrdset_done(check2);
  70
  71         // --------------------------------------------------------------------
  72         // check chart 3
  73
  74         if(!apps_cpu) apps_cpu = rrdset_find_localhost("apps.cpu");
  75         if(check3->counter_done) rrdset_next_usec(check3, loop_usec);
  76         now_realtime_timeval(&loop);
  77         rrddim_set(check3, "caller", (long long) dt_usec(&loop, &check1->last_collected_time));
  78         rrddim_set(check3, "netdata", (long long) dt_usec(&loop, &check2->last_collected_time));
  79         if(apps_cpu) rrddim_set(check3, "apps.plugin", (long long) dt_usec(&loop, &apps_cpu->last_collected_time));
  80         rrdset_done(check3);
  81     }
  82
  83     info("CHECKS thread exiting");
  84
  85     static_thread->enabled = 0;
  86     pthread_exit(NULL);
  87     return NULL;
  88 }
  89