74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_rusage.c
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* Resource usage measurement support routines.
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*
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*
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* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/utils/misc/pg_rusage.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <unistd.h>
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#include "utils/pg_rusage.h"
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/*
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* Initialize usage snapshot.
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*/
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void
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pg_rusage_init(PGRUsage *ru0)
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{
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getrusage(RUSAGE_SELF, &ru0->ru);
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gettimeofday(&ru0->tv, NULL);
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}
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/*
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* Compute elapsed time since ru0 usage snapshot, and format into
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* a displayable string. Result is in a static string, which is
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* tacky, but no one ever claimed that the Postgres backend is
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* threadable...
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*/
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const char *
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pg_rusage_show(const PGRUsage *ru0)
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{
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static char result[100];
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PGRUsage ru1;
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pg_rusage_init(&ru1);
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if (ru1.tv.tv_usec < ru0->tv.tv_usec)
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{
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ru1.tv.tv_sec--;
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ru1.tv.tv_usec += 1000000;
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}
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if (ru1.ru.ru_stime.tv_usec < ru0->ru.ru_stime.tv_usec)
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{
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ru1.ru.ru_stime.tv_sec--;
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ru1.ru.ru_stime.tv_usec += 1000000;
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}
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if (ru1.ru.ru_utime.tv_usec < ru0->ru.ru_utime.tv_usec)
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{
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ru1.ru.ru_utime.tv_sec--;
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ru1.ru.ru_utime.tv_usec += 1000000;
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}
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snprintf(result, sizeof(result),
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_("CPU: user: %d.%02d s, system: %d.%02d s, elapsed: %d.%02d s"),
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(int) (ru1.ru.ru_utime.tv_sec - ru0->ru.ru_utime.tv_sec),
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(int) (ru1.ru.ru_utime.tv_usec - ru0->ru.ru_utime.tv_usec) / 10000,
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(int) (ru1.ru.ru_stime.tv_sec - ru0->ru.ru_stime.tv_sec),
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(int) (ru1.ru.ru_stime.tv_usec - ru0->ru.ru_stime.tv_usec) / 10000,
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(int) (ru1.tv.tv_sec - ru0->tv.tv_sec),
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(int) (ru1.tv.tv_usec - ru0->tv.tv_usec) / 10000);
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return result;
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}
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