1 /*-------------------------------------------------------------------------
4 * Resource usage measurement support routines.
7 * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
8 * Portions Copyright (c) 1994, Regents of the University of California
12 * $PostgreSQL: pgsql/src/backend/utils/misc/pg_rusage.c,v 1.4 2006/03/05 15:58:49 momjian Exp $
14 *-------------------------------------------------------------------------
20 #include "utils/pg_rusage.h"
24 * Initialize usage snapshot.
27 pg_rusage_init(PGRUsage *ru0)
29 getrusage(RUSAGE_SELF, &ru0->ru);
30 gettimeofday(&ru0->tv, NULL);
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
40 pg_rusage_show(const PGRUsage *ru0)
42 static char result[100];
47 if (ru1.tv.tv_usec < ru0->tv.tv_usec)
50 ru1.tv.tv_usec += 1000000;
52 if (ru1.ru.ru_stime.tv_usec < ru0->ru.ru_stime.tv_usec)
54 ru1.ru.ru_stime.tv_sec--;
55 ru1.ru.ru_stime.tv_usec += 1000000;
57 if (ru1.ru.ru_utime.tv_usec < ru0->ru.ru_utime.tv_usec)
59 ru1.ru.ru_utime.tv_sec--;
60 ru1.ru.ru_utime.tv_usec += 1000000;
63 snprintf(result, sizeof(result),
64 "CPU %d.%02ds/%d.%02du sec elapsed %d.%02d sec",
65 (int) (ru1.ru.ru_stime.tv_sec - ru0->ru.ru_stime.tv_sec),
66 (int) (ru1.ru.ru_stime.tv_usec - ru0->ru.ru_stime.tv_usec) / 10000,
67 (int) (ru1.ru.ru_utime.tv_sec - ru0->ru.ru_utime.tv_sec),
68 (int) (ru1.ru.ru_utime.tv_usec - ru0->ru.ru_utime.tv_usec) / 10000,
69 (int) (ru1.tv.tv_sec - ru0->tv.tv_sec),
70 (int) (ru1.tv.tv_usec - ru0->tv.tv_usec) / 10000);