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Sprite 1984 - 1993
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Sprite 1984 - 1993.iso
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benchmarks
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getpid
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getpid.c
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C/C++ Source or Header
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1989-08-31
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/*
* getpid.c --
*
* This file is a benchmark program to measure the cost of a
* minimal kernel call (getpid). It should be invoked as follows:
*
* getpid count
*
* Where count is the number of calls to make. It makes that
* many calls, then prints out the average time per call.
*
* Copyright 1989 Regents of the University of California
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies. The University of California
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
*/
#ifndef lint
static char rcsid[] = "$Header: /sprite/src/benchmarks/getpid/RCS/getpid.c,v 1.1 89/08/31 13:19:47 ouster Exp $ SPRITE (Berkeley)";
#endif /* not lint */
#include <stdio.h>
#include <sys/time.h>
#include <sys/resource.h>
main(argc, argv)
int argc;
char **argv;
{
int count, i;
struct rusage begin ,end;
struct timeval start, stop;
struct timezone tz;
int micros;
double timePer;
if (argc != 2) {
fprintf(stderr, "Usage: getpid count\n");
exit(1);
}
count = atoi(argv[1]);
#ifdef GETRUSAGE
getrusage(RUSAGE_SELF, &begin);
#else
gettimeofday(&start, (struct timezone *) NULL);
#endif
for (i = 0; i < count; i++) {
(void) getpid();
}
#ifdef GETRUSAGE
getrusage(RUSAGE_SELF, &end);
micros = (end.ru_utime.tv_sec + end.ru_stime.tv_sec
- begin.ru_utime.tv_sec - begin.ru_stime.tv_sec)*1000000
+ (end.ru_utime.tv_usec - begin.ru_utime.tv_usec)
+ (end.ru_stime.tv_usec - begin.ru_stime.tv_usec);
#else
gettimeofday(&stop, (struct timezone *) NULL);
micros = 1000000*(stop.tv_sec - start.tv_sec)
+ stop.tv_usec - start.tv_usec;
#endif
timePer = micros;
printf("Time per iteration: %.2f microseconds\n", timePer/count);
}