Age Owner 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
6397 tgl 27 CBC 3390 : pg_rusage_init(PGRUsage *ru0)
28 : {
29 3390 : getrusage(RUSAGE_SELF, &ru0->ru);
6378 andrew 30 3390 : gettimeofday(&ru0->tv, NULL);
6397 tgl 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 : {
6397 tgl 54 UBC 0 : ru1.ru.ru_stime.tv_sec--;
55 0 : ru1.ru.ru_stime.tv_usec += 1000000;
56 : }
6397 tgl 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),
2135 alvherre 64 247 : _("CPU: user: %d.%02d s, system: %d.%02d s, elapsed: %d.%02d s"),
6397 tgl 65 247 : (int) (ru1.ru.ru_utime.tv_sec - ru0->ru.ru_utime.tv_sec),
2118 66 247 : (int) (ru1.ru.ru_utime.tv_usec - ru0->ru.ru_utime.tv_usec) / 10000,
2363 peter_e 67 247 : (int) (ru1.ru.ru_stime.tv_sec - ru0->ru.ru_stime.tv_sec),
2118 tgl 68 247 : (int) (ru1.ru.ru_stime.tv_usec - ru0->ru.ru_stime.tv_usec) / 10000,
6397 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 : }
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