| /*------------------------------------------------------------------------- |
| * |
| * pg_rusage.c |
| * Resource usage measurement support routines. |
| * |
| * |
| * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group |
| * Portions Copyright (c) 1994, Regents of the University of California |
| * |
| * |
| * IDENTIFICATION |
| * $PostgreSQL: pgsql/src/backend/utils/misc/pg_rusage.c,v 1.7 2009/01/01 17:23:53 momjian Exp $ |
| * |
| *------------------------------------------------------------------------- |
| */ |
| #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; |
| } |