69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* Utilities for benchmarks.
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Copyright (C) 2018-2025 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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struct timings_state
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{
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/* Filled when the timings start. */
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struct timeval real_start;
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struct timeval user_start;
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struct timeval sys_start;
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/* Filled when the timings end. */
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long real_usec;
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long user_usec;
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long sys_usec;
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};
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static void
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timing_start (struct timings_state *ts)
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{
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struct rusage usage;
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getrusage (RUSAGE_SELF, &usage);
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ts->user_start = usage.ru_utime;
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ts->sys_start = usage.ru_stime;
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gettimeofday (&ts->real_start, NULL);
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}
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static void
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timing_end (struct timings_state *ts)
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{
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struct timeval real_end;
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struct rusage usage;
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gettimeofday (&real_end, NULL);
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getrusage (RUSAGE_SELF, &usage);
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ts->real_usec = (real_end.tv_sec - ts->real_start.tv_sec) * 1000000
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+ real_end.tv_usec - ts->real_start.tv_usec;
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ts->user_usec = (usage.ru_utime.tv_sec - ts->user_start.tv_sec) * 1000000
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+ usage.ru_utime.tv_usec - ts->user_start.tv_usec;
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ts->sys_usec = (usage.ru_stime.tv_sec - ts->sys_start.tv_sec) * 1000000
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+ usage.ru_stime.tv_usec - ts->sys_start.tv_usec;
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}
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_GL_UNUSED static void
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timing_output (const struct timings_state *ts)
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{
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printf ("real %10.6f\n", (double)ts->real_usec / 1000000.0);
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printf ("user %7.3f\n", (double)ts->user_usec / 1000000.0);
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printf ("sys %7.3f\n", (double)ts->sys_usec / 1000000.0);
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}
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