TLA  Line data    Source code

       1                 : /*-------------------------------------------------------------------------
       2                 :  *
       3                 :  * pg_rusage.c
       4                 :  *    Resource usage measurement support routines.
       5                 :  *
       6                 :  *
       7                 :  * Portions Copyright (c) 1996-2023, 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 CBC        3390 : pg_rusage_init(PGRUsage *ru0)
      28                 : {
      29            3390 :     getrusage(RUSAGE_SELF, &ru0->ru);
      30            3390 :     gettimeofday(&ru0->tv, NULL);
      31            3390 : }
      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             247 : pg_rusage_show(const PGRUsage *ru0)
      41                 : {
      42                 :     static char result[100];
      43                 :     PGRUsage    ru1;
      44                 : 
      45             247 :     pg_rusage_init(&ru1);
      46                 : 
      47             247 :     if (ru1.tv.tv_usec < ru0->tv.tv_usec)
      48                 :     {
      49              17 :         ru1.tv.tv_sec--;
      50              17 :         ru1.tv.tv_usec += 1000000;
      51                 :     }
      52             247 :     if (ru1.ru.ru_stime.tv_usec < ru0->ru.ru_stime.tv_usec)
      53                 :     {
      54 UBC           0 :         ru1.ru.ru_stime.tv_sec--;
      55               0 :         ru1.ru.ru_stime.tv_usec += 1000000;
      56                 :     }
      57 CBC         247 :     if (ru1.ru.ru_utime.tv_usec < ru0->ru.ru_utime.tv_usec)
      58                 :     {
      59               1 :         ru1.ru.ru_utime.tv_sec--;
      60               1 :         ru1.ru.ru_utime.tv_usec += 1000000;
      61                 :     }
      62                 : 
      63             247 :     snprintf(result, sizeof(result),
      64             247 :              _("CPU: user: %d.%02d s, system: %d.%02d s, elapsed: %d.%02d s"),
      65             247 :              (int) (ru1.ru.ru_utime.tv_sec - ru0->ru.ru_utime.tv_sec),
      66             247 :              (int) (ru1.ru.ru_utime.tv_usec - ru0->ru.ru_utime.tv_usec) / 10000,
      67             247 :              (int) (ru1.ru.ru_stime.tv_sec - ru0->ru.ru_stime.tv_sec),
      68             247 :              (int) (ru1.ru.ru_stime.tv_usec - ru0->ru.ru_stime.tv_usec) / 10000,
      69             247 :              (int) (ru1.tv.tv_sec - ru0->tv.tv_sec),
      70             247 :              (int) (ru1.tv.tv_usec - ru0->tv.tv_usec) / 10000);
      71                 : 
      72             247 :     return result;
      73                 : }