82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
|
/*
|
||
|
|
*
|
||
|
|
* syscall.c
|
||
|
|
*
|
||
|
|
* syscall: Benchmark for system call performance
|
||
|
|
*/
|
||
|
|
#include "../perf.h"
|
||
|
|
#include "../util/util.h"
|
||
|
|
#include <subcmd/parse-options.h>
|
||
|
|
#include "../builtin.h"
|
||
|
|
#include "bench.h"
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <sys/time.h>
|
||
|
|
#include <sys/syscall.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
#define LOOPS_DEFAULT 10000000
|
||
|
|
static int loops = LOOPS_DEFAULT;
|
||
|
|
|
||
|
|
static const struct option options[] = {
|
||
|
|
OPT_INTEGER('l', "loop", &loops, "Specify number of loops"),
|
||
|
|
OPT_END()
|
||
|
|
};
|
||
|
|
|
||
|
|
static const char * const bench_syscall_usage[] = {
|
||
|
|
"perf bench syscall <options>",
|
||
|
|
NULL
|
||
|
|
};
|
||
|
|
|
||
|
|
int bench_syscall_basic(int argc, const char **argv)
|
||
|
|
{
|
||
|
|
struct timeval start, stop, diff;
|
||
|
|
unsigned long long result_usec = 0;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
argc = parse_options(argc, argv, options, bench_syscall_usage, 0);
|
||
|
|
|
||
|
|
gettimeofday(&start, NULL);
|
||
|
|
|
||
|
|
for (i = 0; i < loops; i++)
|
||
|
|
getppid();
|
||
|
|
|
||
|
|
gettimeofday(&stop, NULL);
|
||
|
|
timersub(&stop, &start, &diff);
|
||
|
|
|
||
|
|
switch (bench_format) {
|
||
|
|
case BENCH_FORMAT_DEFAULT:
|
||
|
|
printf("# Executed %'d getppid() calls\n", loops);
|
||
|
|
|
||
|
|
result_usec = diff.tv_sec * 1000000;
|
||
|
|
result_usec += diff.tv_usec;
|
||
|
|
|
||
|
|
printf(" %14s: %lu.%03lu [sec]\n\n", "Total time",
|
||
|
|
(unsigned long) diff.tv_sec,
|
||
|
|
(unsigned long) (diff.tv_usec/1000));
|
||
|
|
|
||
|
|
printf(" %14lf usecs/op\n",
|
||
|
|
(double)result_usec / (double)loops);
|
||
|
|
printf(" %'14d ops/sec\n",
|
||
|
|
(int)((double)loops /
|
||
|
|
((double)result_usec / (double)1000000)));
|
||
|
|
break;
|
||
|
|
|
||
|
|
case BENCH_FORMAT_SIMPLE:
|
||
|
|
printf("%lu.%03lu\n",
|
||
|
|
(unsigned long) diff.tv_sec,
|
||
|
|
(unsigned long) (diff.tv_usec / 1000));
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
/* reaching here is something disaster */
|
||
|
|
fprintf(stderr, "Unknown format:%d\n", bench_format);
|
||
|
|
exit(1);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|