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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);
- }
-