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/*
* Copyright (C) 2018 Free Software Foundation, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <sys/time.h>
struct timings_state
{
/* Filled when the timings start. */
struct timeval real_start;
struct timeval user_start;
struct timeval sys_start;
/* Filled when the timings end. */
long real_usec;
long user_usec;
long sys_usec;
};
static void
timing_start (struct timings_state *ts)
{
struct rusage usage;
getrusage (RUSAGE_SELF, &usage);
ts->user_start = usage.ru_utime;
ts->sys_start = usage.ru_stime;
gettimeofday (&ts->real_start, NULL);
}
static void
timing_end (struct timings_state *ts)
{
struct timeval real_end;
struct rusage usage;
gettimeofday (&real_end, NULL);
getrusage (RUSAGE_SELF, &usage);
ts->real_usec = (real_end.tv_sec - ts->real_start.tv_sec) * 1000000
+ real_end.tv_usec - ts->real_start.tv_usec;
ts->user_usec = (usage.ru_utime.tv_sec - ts->user_start.tv_sec) * 1000000
+ usage.ru_utime.tv_usec - ts->user_start.tv_usec;
ts->sys_usec = (usage.ru_stime.tv_sec - ts->sys_start.tv_sec) * 1000000
+ usage.ru_stime.tv_usec - ts->sys_start.tv_usec;
}
static void
timing_output (const struct timings_state *ts)
{
printf ("real %10.6f\n", (double)ts->real_usec / 1000000.0);
printf ("user %7.3f\n", (double)ts->user_usec / 1000000.0);
printf ("sys %7.3f\n", (double)ts->sys_usec / 1000000.0);
}
int
main (int argc, char *argv[])
{
if (argc != 3)
{
fprintf (stderr, "Usage: %s SIZE REPETITIONS\n", argv[0]);
exit (1);
}
size_t size = atol (argv[1]);
int repeat = atoi (argv[2]);
char *memblock = (char *) malloc (size);
/* Fill the memory block. */
{
size_t i;
for (i = 0; i < size; i++)
memblock[i] =
(unsigned char) (((i * (i-1) * (i-5)) >> 6) + (i % 499) + (i % 101));
}
struct timings_state ts;
timing_start (&ts);
int count;
for (count = 0; count < repeat; count++)
{
char digest[64];
FUNC (memblock, size, digest);
}
timing_end (&ts);
timing_output (&ts);
return 0;
}
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