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   pmExtendFetchGroup_event    ( 3 )

упрощенная выборка и преобразование значений показателей производительности (simplified performance metrics value fetch and conversion)
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Примеры (Examples)

The following program demonstrates fetchgroup usage.  Run it with
       different $PCP_DISK_UNITS environment variables to see different
       unit/rate conversion in effect.


       #include <pcp/pmapi.h>
       #include <stdio.h>


       #define pcpassert(sts) \
           while (sts<0) { fprintf(stderr, "%s\n", pmErrStr(sts)); exit(42); }


       int main()
       {
           pmFG fg;
           pmAtomValue v, v2;
           enum { v3_maxnum = 100 };
           pmAtomValue v3_values[v3_maxnum];
           char *v3_names[v3_maxnum];
           int v3_stss[v3_maxnum];
           unsigned int v3_num;
           int sts, i;
           char *diskunits = getenv("PCP_DISK_UNITS");
           struct timeval t;


           sts = pmCreateFetchGroup(&fg, PM_CONTEXT_HOST, "local:");
           pcpassert(sts);
           sts = pmExtendFetchGroup_item(fg, "kernel.all.load", "1 minute",
                                         NULL, &v, PM_TYPE_FLOAT, NULL);
           pcpassert(sts);
           sts = pmExtendFetchGroup_item(fg, "kernel.all.idletime", NULL,
                                         "hour", &v2, PM_TYPE_DOUBLE, NULL);
           pcpassert(sts);
           sts = pmExtendFetchGroup_indom(fg, "disk.dev.total", diskunits,
                                          NULL, v3_names,
                                          v3_values, PM_TYPE_STRING,
                                          v3_stss, v3_maxnum, &v3_num, NULL);
           pcpassert(sts);
           sts = pmExtendFetchGroup_timestamp(fg, &t);
           pcpassert(sts);


           for (i=0; i < 10; i++) {
               unsigned int j;
               char stamp[28];


               sts = pmFetchGroup(fg);
               pcpassert(sts);
               printf("%s", pmCtime(&t.tv_sec, stamp));
               printf("1-minute load: %f; idletime: %f h\n", v.f, v2.d);
               for (j=0; j < v3_num; j++) {
                   if (v3_stss[j] == 0)
                        printf("disk %s i/o operations (%s): %s\n",
                               v3_names[j] ? v3_names[j] : "?",
                               diskunits ? diskunits : "-",
                               v3_values[j].cp);
               }
               sleep(1);
           }


           sts = pmDestroyFetchGroup(fg);
           pcpassert(sts);
           return 0;
       }