/* * * 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 <sys/wait.h>#include <unistd.h>#include <stdlib.h> #ifndef __NR_fork#define __NR_fork -1#endif static int loops; 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}; static void test_fork(void){ pid_t pid = fork(); if (pid < 0) { fprintf(stderr, "fork failed\n"); exit(1); } else if (pid == 0) { exit(0); } else { if (waitpid(pid, NULL, 0) < 0) { fprintf(stderr, "waitpid failed\n"); exit(1); } }} static void test_execve(void){ const char *pathname = "/bin/true"; char *const argv[] = { (char *)pathname, NULL }; pid_t pid = fork(); if (pid < 0) { fprintf(stderr, "fork failed\n"); exit(1); } else if (pid == 0) { execve(pathname, argv, NULL); fprintf(stderr, "execve /bin/true failed\n"); exit(1); } else { if (waitpid(pid, NULL, 0) < 0) { fprintf(stderr, "waitpid failed\n"); exit(1); } }} static int bench_syscall_common(int argc, const char **argv, int syscall){ struct timeval start, stop, diff; unsigned long long result_usec = 0; const char *name = NULL; int i; switch (syscall) { case __NR_fork: case __NR_execve: /* Limit default loop to 10000 times to save time */ loops = 10000; break; default: loops = 10000000; break; } /* Options -l and --loops override default above */ argc = parse_options(argc, argv, options, bench_syscall_usage, 0); gettimeofday(&start, NULL); for (i = 0; i < loops; i++) { switch (syscall) { case __NR_getppid: getppid(); break; case __NR_getpgid: getpgid(0); break; case __NR_fork: test_fork(); break; case __NR_execve: test_execve(); default: break; } } gettimeofday(&stop, NULL); timersub(&stop, &start, &diff); switch (syscall) { case __NR_getppid: name = "getppid()"; break; case __NR_getpgid: name = "getpgid()"; break; case __NR_fork: name = "fork()"; break; case __NR_execve: name = "execve()"; break; default: break; } switch (bench_format) { case BENCH_FORMAT_DEFAULT: printf("# Executed %'d %s calls\n", loops, name); 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;} int bench_syscall_basic(int argc, const char **argv){ return bench_syscall_common(argc, argv, __NR_getppid);} int bench_syscall_getpgid(int argc, const char **argv){ return bench_syscall_common(argc, argv, __NR_getpgid);} int bench_syscall_fork(int argc, const char **argv){ return bench_syscall_common(argc, argv, __NR_fork);} int bench_syscall_execve(int argc, const char **argv){ return bench_syscall_common(argc, argv, __NR_execve);}
/*
*
* 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 <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#ifndef __NR_fork
#define __NR_fork -1
#endif
static int loops;
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
};
static void test_fork(void)
{
pid_t pid = fork();
if (pid < 0) {
fprintf(stderr, "fork failed\n");
exit(1);
} else if (pid == 0) {
exit(0);
} else {
if (waitpid(pid, NULL, 0) < 0) {
fprintf(stderr, "waitpid failed\n");
exit(1);
}
}
}
static void test_execve(void)
{
const char *pathname = "/bin/true";
char *const argv[] = { (char *)pathname, NULL };
pid_t pid = fork();
if (pid < 0) {
fprintf(stderr, "fork failed\n");
exit(1);
} else if (pid == 0) {
execve(pathname, argv, NULL);
fprintf(stderr, "execve /bin/true failed\n");
exit(1);
} else {
if (waitpid(pid, NULL, 0) < 0) {
fprintf(stderr, "waitpid failed\n");
exit(1);
}
}
}
static int bench_syscall_common(int argc, const char **argv, int syscall)
{
struct timeval start, stop, diff;
unsigned long long result_usec = 0;
const char *name = NULL;
int i;
switch (syscall) {
case __NR_fork:
case __NR_execve:
/* Limit default loop to 10000 times to save time */
loops = 10000;
break;
default:
loops = 10000000;
break;
}
/* Options -l and --loops override default above */
argc = parse_options(argc, argv, options, bench_syscall_usage, 0);
gettimeofday(&start, NULL);
for (i = 0; i < loops; i++) {
switch (syscall) {
case __NR_getppid:
getppid();
break;
case __NR_getpgid:
getpgid(0);
break;
case __NR_fork:
test_fork();
break;
case __NR_execve:
test_execve();
default:
break;
}
}
gettimeofday(&stop, NULL);
timersub(&stop, &start, &diff);
switch (syscall) {
case __NR_getppid:
name = "getppid()";
break;
case __NR_getpgid:
name = "getpgid()";
break;
case __NR_fork:
name = "fork()";
break;
case __NR_execve:
name = "execve()";
break;
default:
break;
}
switch (bench_format) {
case BENCH_FORMAT_DEFAULT:
printf("# Executed %'d %s calls\n", loops, name);
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;
}
int bench_syscall_basic(int argc, const char **argv)
{
return bench_syscall_common(argc, argv, __NR_getppid);
}
int bench_syscall_getpgid(int argc, const char **argv)
{
return bench_syscall_common(argc, argv, __NR_getpgid);
}
int bench_syscall_fork(int argc, const char **argv)
{
return bench_syscall_common(argc, argv, __NR_fork);
}
int bench_syscall_execve(int argc, const char **argv)
{
return bench_syscall_common(argc, argv, __NR_execve);
}