src/plugin_checks.c

   1 #include <pthread.h>
   2 #include <sys/time.h>
   3 #include <sys/resource.h>
   4 #include <strings.h>
   5 #include <unistd.h>
   6
   7 #include "common.h"
   8 #include "config.h"
   9 #include "log.h"
  10 #include "rrd.h"
  11 #include "plugin_checks.h"
  12
  13 void *checks_main(void *ptr)
  14 {
  15         if(ptr) { ; }
  16
  17         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
  18                 error("Cannot set pthread cancel type to DEFERRED.");
  19
  20         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
  21                 error("Cannot set pthread cancel state to ENABLE.");
  22
  23         unsigned long long usec = 0, susec = rrd_update_every * 1000000ULL, loop_usec = 0, total_susec = 0;
  24         struct timeval now, last, loop;
  25
  26         RRDSET *check1, *check2, *check3, *apps_cpu = NULL;
  27
  28         check1 = rrdset_create("netdata", "check1", NULL, "netdata", "Caller gives microseconds", "a million !", 99999, rrd_update_every, RRDSET_TYPE_LINE);
  29         rrddim_add(check1, "absolute", NULL, -1, 1, RRDDIM_ABSOLUTE);
  30         rrddim_add(check1, "incremental", NULL, 1, 1 * rrd_update_every, RRDDIM_INCREMENTAL);
  31
  32         check2 = rrdset_create("netdata", "check2", NULL, "netdata", "Netdata calcs microseconds", "a million !", 99999, rrd_update_every, RRDSET_TYPE_LINE);
  33         rrddim_add(check2, "absolute", NULL, -1, 1, RRDDIM_ABSOLUTE);
  34         rrddim_add(check2, "incremental", NULL, 1, 1 * rrd_update_every, RRDDIM_INCREMENTAL);
  35
  36         check3 = rrdset_create("netdata", "checkdt", NULL, "netdata", "Clock difference", "microseconds diff", 99999, rrd_update_every, RRDSET_TYPE_LINE);
  37         rrddim_add(check3, "caller", NULL, 1, 1, RRDDIM_ABSOLUTE);
  38         rrddim_add(check3, "netdata", NULL, 1, 1, RRDDIM_ABSOLUTE);
  39         rrddim_add(check3, "apps.plugin", NULL, 1, 1, RRDDIM_ABSOLUTE);
  40
  41         gettimeofday(&last, NULL);
  42         while(1) {
  43                 usleep(susec);
  44
  45                 // find the time to sleep in order to wait exactly update_every seconds
  46                 gettimeofday(&now, NULL);
  47                 loop_usec = usecdiff(&now, &last);
  48                 usec = loop_usec - susec;
  49                 debug(D_PROCNETDEV_LOOP, "CHECK: last loop took %llu usec (worked for %llu, sleeped for %llu).", loop_usec, usec, susec);
  50
  51                 if(usec < (rrd_update_every * 1000000ULL / 2ULL)) susec = (rrd_update_every * 1000000ULL) - usec;
  52                 else susec = rrd_update_every * 1000000ULL / 2ULL;
  53
  54                 // --------------------------------------------------------------------
  55                 // Calculate loop time
  56
  57                 last.tv_sec = now.tv_sec;
  58                 last.tv_usec = now.tv_usec;
  59                 total_susec += loop_usec;
  60
  61                 // --------------------------------------------------------------------
  62                 // check chart 1
  63
  64                 if(check1->counter_done) rrdset_next_usec(check1, loop_usec);
  65                 rrddim_set(check1, "absolute", 1000000);
  66                 rrddim_set(check1, "incremental", total_susec);
  67                 rrdset_done(check1);
  68
  69                 // --------------------------------------------------------------------
  70                 // check chart 2
  71
  72                 if(check2->counter_done) rrdset_next(check2);
  73                 rrddim_set(check2, "absolute", 1000000);
  74                 rrddim_set(check2, "incremental", total_susec);
  75                 rrdset_done(check2);
  76
  77                 // --------------------------------------------------------------------
  78                 // check chart 3
  79
  80                 if(!apps_cpu) apps_cpu = rrdset_find("apps.cpu");
  81                 if(check3->counter_done) rrdset_next_usec(check3, loop_usec);
  82                 gettimeofday(&loop, NULL);
  83                 rrddim_set(check3, "caller", (long long)usecdiff(&loop, &check1->last_collected_time));
  84                 rrddim_set(check3, "netdata", (long long)usecdiff(&loop, &check2->last_collected_time));
  85                 if(apps_cpu) rrddim_set(check3, "apps.plugin", (long long)usecdiff(&loop, &apps_cpu->last_collected_time));
  86                 rrdset_done(check3);
  87         }
  88
  89         return NULL;
  90 }
  91