Line data    Source code

       1              : /*-------------------------------------------------------------------------
       2              :  *
       3              :  * pg_rusage.c
       4              :  *    Resource usage measurement support routines.
       5              :  *
       6              :  *
       7              :  * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
       8              :  * Portions Copyright (c) 1994, Regents of the University of California
       9              :  *
      10              :  *
      11              :  * IDENTIFICATION
      12              :  *    src/backend/utils/misc/pg_rusage.c
      13              :  *
      14              :  *-------------------------------------------------------------------------
      15              :  */
      16              : #include "postgres.h"
      17              : 
      18              : #include <unistd.h>
      19              : 
      20              : #include "utils/pg_rusage.h"
      21              : 
      22              : 
      23              : /*
      24              :  * Initialize usage snapshot.
      25              :  */
      26              : void
      27       204161 : pg_rusage_init(PGRUsage *ru0)
      28              : {
      29       204161 :     getrusage(RUSAGE_SELF, &ru0->ru);
      30       204161 :     gettimeofday(&ru0->tv, NULL);
      31       204161 : }
      32              : 
      33              : /*
      34              :  * Compute elapsed time since ru0 usage snapshot, and format into
      35              :  * a displayable string.  Result is in a static string, which is
      36              :  * tacky, but no one ever claimed that the Postgres backend is
      37              :  * threadable...
      38              :  */
      39              : const char *
      40        99139 : pg_rusage_show(const PGRUsage *ru0)
      41              : {
      42              :     static char result[100];
      43              :     PGRUsage    ru1;
      44              : 
      45        99139 :     pg_rusage_init(&ru1);
      46              : 
      47        99139 :     if (ru1.tv.tv_usec < ru0->tv.tv_usec)
      48              :     {
      49          704 :         ru1.tv.tv_sec--;
      50          704 :         ru1.tv.tv_usec += 1000000;
      51              :     }
      52        99139 :     if (ru1.ru.ru_stime.tv_usec < ru0->ru.ru_stime.tv_usec)
      53              :     {
      54            0 :         ru1.ru.ru_stime.tv_sec--;
      55            0 :         ru1.ru.ru_stime.tv_usec += 1000000;
      56              :     }
      57        99139 :     if (ru1.ru.ru_utime.tv_usec < ru0->ru.ru_utime.tv_usec)
      58              :     {
      59            0 :         ru1.ru.ru_utime.tv_sec--;
      60            0 :         ru1.ru.ru_utime.tv_usec += 1000000;
      61              :     }
      62              : 
      63        99139 :     snprintf(result, sizeof(result),
      64        99139 :              _("CPU: user: %d.%02d s, system: %d.%02d s, elapsed: %d.%02d s"),
      65        99139 :              (int) (ru1.ru.ru_utime.tv_sec - ru0->ru.ru_utime.tv_sec),
      66        99139 :              (int) (ru1.ru.ru_utime.tv_usec - ru0->ru.ru_utime.tv_usec) / 10000,
      67        99139 :              (int) (ru1.ru.ru_stime.tv_sec - ru0->ru.ru_stime.tv_sec),
      68        99139 :              (int) (ru1.ru.ru_stime.tv_usec - ru0->ru.ru_stime.tv_usec) / 10000,
      69        99139 :              (int) (ru1.tv.tv_sec - ru0->tv.tv_sec),
      70        99139 :              (int) (ru1.tv.tv_usec - ru0->tv.tv_usec) / 10000);
      71              : 
      72        99139 :     return result;
      73              : }