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/*-------------------------------------------------------------------------
*
* pg_rusage.c
* Resource usage measurement support routines.
*
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/misc/pg_rusage.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <unistd.h>
#include "utils/pg_rusage.h"
/*
* Initialize usage snapshot.
*/
void
pg_rusage_init(PGRUsage *ru0)
{
getrusage(RUSAGE_SELF, &ru0->ru);
gettimeofday(&ru0->tv, NULL);
}
/*
* Compute elapsed time since ru0 usage snapshot, and format into
* a displayable string. Result is in a static string, which is
* tacky, but no one ever claimed that the Postgres backend is
* threadable...
*/
const char *
pg_rusage_show(const PGRUsage *ru0)
{
static char result[100];
PGRUsage ru1;
pg_rusage_init(&ru1);
if (ru1.tv.tv_usec < ru0->tv.tv_usec)
{
ru1.tv.tv_sec--;
ru1.tv.tv_usec += 1000000;
}
if (ru1.ru.ru_stime.tv_usec < ru0->ru.ru_stime.tv_usec)
{
ru1.ru.ru_stime.tv_sec--;
ru1.ru.ru_stime.tv_usec += 1000000;
}
if (ru1.ru.ru_utime.tv_usec < ru0->ru.ru_utime.tv_usec)
{
ru1.ru.ru_utime.tv_sec--;
ru1.ru.ru_utime.tv_usec += 1000000;
}
snprintf(result, sizeof(result),
"CPU %d.%02ds/%d.%02du sec elapsed %d.%02d sec",
(int) (ru1.ru.ru_stime.tv_sec - ru0->ru.ru_stime.tv_sec),
(int) (ru1.ru.ru_stime.tv_usec - ru0->ru.ru_stime.tv_usec) / 10000,
(int) (ru1.ru.ru_utime.tv_sec - ru0->ru.ru_utime.tv_sec),
(int) (ru1.ru.ru_utime.tv_usec - ru0->ru.ru_utime.tv_usec) / 10000,
(int) (ru1.tv.tv_sec - ru0->tv.tv_sec),
(int) (ru1.tv.tv_usec - ru0->tv.tv_usec) / 10000);
return result;
}
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