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1// SPDX-License-Identifier: GPL-2.0
2/*
3 *
4 * sched-pipe.c
5 *
6 * pipe: Benchmark for pipe()
7 *
8 * Based on pipe-test-1m.c by Ingo Molnar <mingo@redhat.com>
9 * http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test-1m.c
10 * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
11 */
12#include <subcmd/parse-options.h>
13#include "bench.h"
14
15#include <unistd.h>
16#include <stdio.h>
17#include <stdlib.h>
18#include <signal.h>
19#include <sys/wait.h>
20#include <string.h>
21#include <errno.h>
22#include <assert.h>
23#include <sys/time.h>
24#include <sys/types.h>
25#include <sys/syscall.h>
26#include <linux/time64.h>
27
28#include <pthread.h>
29
30struct thread_data {
31 int nr;
32 int pipe_read;
33 int pipe_write;
34 pthread_t pthread;
35};
36
37#define LOOPS_DEFAULT 1000000
38static int loops = LOOPS_DEFAULT;
39
40/* Use processes by default: */
41static bool threaded;
42
43static const struct option options[] = {
44 OPT_INTEGER('l', "loop", &loops, "Specify number of loops"),
45 OPT_BOOLEAN('T', "threaded", &threaded, "Specify threads/process based task setup"),
46 OPT_END()
47};
48
49static const char * const bench_sched_pipe_usage[] = {
50 "perf bench sched pipe <options>",
51 NULL
52};
53
54static void *worker_thread(void *__tdata)
55{
56 struct thread_data *td = __tdata;
57 int m = 0, i;
58 int ret;
59
60 for (i = 0; i < loops; i++) {
61 if (!td->nr) {
62 ret = read(td->pipe_read, &m, sizeof(int));
63 BUG_ON(ret != sizeof(int));
64 ret = write(td->pipe_write, &m, sizeof(int));
65 BUG_ON(ret != sizeof(int));
66 } else {
67 ret = write(td->pipe_write, &m, sizeof(int));
68 BUG_ON(ret != sizeof(int));
69 ret = read(td->pipe_read, &m, sizeof(int));
70 BUG_ON(ret != sizeof(int));
71 }
72 }
73
74 return NULL;
75}
76
77int bench_sched_pipe(int argc, const char **argv)
78{
79 struct thread_data threads[2], *td;
80 int pipe_1[2], pipe_2[2];
81 struct timeval start, stop, diff;
82 unsigned long long result_usec = 0;
83 int nr_threads = 2;
84 int t;
85
86 /*
87 * why does "ret" exist?
88 * discarding returned value of read(), write()
89 * causes error in building environment for perf
90 */
91 int __maybe_unused ret, wait_stat;
92 pid_t pid, retpid __maybe_unused;
93
94 argc = parse_options(argc, argv, options, bench_sched_pipe_usage, 0);
95
96 BUG_ON(pipe(pipe_1));
97 BUG_ON(pipe(pipe_2));
98
99 gettimeofday(&start, NULL);
100
101 for (t = 0; t < nr_threads; t++) {
102 td = threads + t;
103
104 td->nr = t;
105
106 if (t == 0) {
107 td->pipe_read = pipe_1[0];
108 td->pipe_write = pipe_2[1];
109 } else {
110 td->pipe_write = pipe_1[1];
111 td->pipe_read = pipe_2[0];
112 }
113 }
114
115
116 if (threaded) {
117
118 for (t = 0; t < nr_threads; t++) {
119 td = threads + t;
120
121 ret = pthread_create(&td->pthread, NULL, worker_thread, td);
122 BUG_ON(ret);
123 }
124
125 for (t = 0; t < nr_threads; t++) {
126 td = threads + t;
127
128 ret = pthread_join(td->pthread, NULL);
129 BUG_ON(ret);
130 }
131
132 } else {
133 pid = fork();
134 assert(pid >= 0);
135
136 if (!pid) {
137 worker_thread(threads + 0);
138 exit(0);
139 } else {
140 worker_thread(threads + 1);
141 }
142
143 retpid = waitpid(pid, &wait_stat, 0);
144 assert((retpid == pid) && WIFEXITED(wait_stat));
145 }
146
147 gettimeofday(&stop, NULL);
148 timersub(&stop, &start, &diff);
149
150 switch (bench_format) {
151 case BENCH_FORMAT_DEFAULT:
152 printf("# Executed %d pipe operations between two %s\n\n",
153 loops, threaded ? "threads" : "processes");
154
155 result_usec = diff.tv_sec * USEC_PER_SEC;
156 result_usec += diff.tv_usec;
157
158 printf(" %14s: %lu.%03lu [sec]\n\n", "Total time",
159 diff.tv_sec,
160 (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
161
162 printf(" %14lf usecs/op\n",
163 (double)result_usec / (double)loops);
164 printf(" %14d ops/sec\n",
165 (int)((double)loops /
166 ((double)result_usec / (double)USEC_PER_SEC)));
167 break;
168
169 case BENCH_FORMAT_SIMPLE:
170 printf("%lu.%03lu\n",
171 diff.tv_sec,
172 (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
173 break;
174
175 default:
176 /* reaching here is something disaster */
177 fprintf(stderr, "Unknown format:%d\n", bench_format);
178 exit(1);
179 break;
180 }
181
182 return 0;
183}
1/*
2 *
3 * sched-pipe.c
4 *
5 * pipe: Benchmark for pipe()
6 *
7 * Based on pipe-test-1m.c by Ingo Molnar <mingo@redhat.com>
8 * http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test-1m.c
9 * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
10 */
11#include "../perf.h"
12#include "../util/util.h"
13#include <subcmd/parse-options.h>
14#include "../builtin.h"
15#include "bench.h"
16
17#include <unistd.h>
18#include <stdio.h>
19#include <stdlib.h>
20#include <signal.h>
21#include <sys/wait.h>
22#include <string.h>
23#include <errno.h>
24#include <assert.h>
25#include <sys/time.h>
26#include <sys/types.h>
27#include <sys/syscall.h>
28#include <linux/time64.h>
29
30#include <pthread.h>
31
32struct thread_data {
33 int nr;
34 int pipe_read;
35 int pipe_write;
36 pthread_t pthread;
37};
38
39#define LOOPS_DEFAULT 1000000
40static int loops = LOOPS_DEFAULT;
41
42/* Use processes by default: */
43static bool threaded;
44
45static const struct option options[] = {
46 OPT_INTEGER('l', "loop", &loops, "Specify number of loops"),
47 OPT_BOOLEAN('T', "threaded", &threaded, "Specify threads/process based task setup"),
48 OPT_END()
49};
50
51static const char * const bench_sched_pipe_usage[] = {
52 "perf bench sched pipe <options>",
53 NULL
54};
55
56static void *worker_thread(void *__tdata)
57{
58 struct thread_data *td = __tdata;
59 int m = 0, i;
60 int ret;
61
62 for (i = 0; i < loops; i++) {
63 if (!td->nr) {
64 ret = read(td->pipe_read, &m, sizeof(int));
65 BUG_ON(ret != sizeof(int));
66 ret = write(td->pipe_write, &m, sizeof(int));
67 BUG_ON(ret != sizeof(int));
68 } else {
69 ret = write(td->pipe_write, &m, sizeof(int));
70 BUG_ON(ret != sizeof(int));
71 ret = read(td->pipe_read, &m, sizeof(int));
72 BUG_ON(ret != sizeof(int));
73 }
74 }
75
76 return NULL;
77}
78
79int bench_sched_pipe(int argc, const char **argv, const char *prefix __maybe_unused)
80{
81 struct thread_data threads[2], *td;
82 int pipe_1[2], pipe_2[2];
83 struct timeval start, stop, diff;
84 unsigned long long result_usec = 0;
85 int nr_threads = 2;
86 int t;
87
88 /*
89 * why does "ret" exist?
90 * discarding returned value of read(), write()
91 * causes error in building environment for perf
92 */
93 int __maybe_unused ret, wait_stat;
94 pid_t pid, retpid __maybe_unused;
95
96 argc = parse_options(argc, argv, options, bench_sched_pipe_usage, 0);
97
98 BUG_ON(pipe(pipe_1));
99 BUG_ON(pipe(pipe_2));
100
101 gettimeofday(&start, NULL);
102
103 for (t = 0; t < nr_threads; t++) {
104 td = threads + t;
105
106 td->nr = t;
107
108 if (t == 0) {
109 td->pipe_read = pipe_1[0];
110 td->pipe_write = pipe_2[1];
111 } else {
112 td->pipe_write = pipe_1[1];
113 td->pipe_read = pipe_2[0];
114 }
115 }
116
117
118 if (threaded) {
119
120 for (t = 0; t < nr_threads; t++) {
121 td = threads + t;
122
123 ret = pthread_create(&td->pthread, NULL, worker_thread, td);
124 BUG_ON(ret);
125 }
126
127 for (t = 0; t < nr_threads; t++) {
128 td = threads + t;
129
130 ret = pthread_join(td->pthread, NULL);
131 BUG_ON(ret);
132 }
133
134 } else {
135 pid = fork();
136 assert(pid >= 0);
137
138 if (!pid) {
139 worker_thread(threads + 0);
140 exit(0);
141 } else {
142 worker_thread(threads + 1);
143 }
144
145 retpid = waitpid(pid, &wait_stat, 0);
146 assert((retpid == pid) && WIFEXITED(wait_stat));
147 }
148
149 gettimeofday(&stop, NULL);
150 timersub(&stop, &start, &diff);
151
152 switch (bench_format) {
153 case BENCH_FORMAT_DEFAULT:
154 printf("# Executed %d pipe operations between two %s\n\n",
155 loops, threaded ? "threads" : "processes");
156
157 result_usec = diff.tv_sec * USEC_PER_SEC;
158 result_usec += diff.tv_usec;
159
160 printf(" %14s: %lu.%03lu [sec]\n\n", "Total time",
161 diff.tv_sec,
162 (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
163
164 printf(" %14lf usecs/op\n",
165 (double)result_usec / (double)loops);
166 printf(" %14d ops/sec\n",
167 (int)((double)loops /
168 ((double)result_usec / (double)USEC_PER_SEC)));
169 break;
170
171 case BENCH_FORMAT_SIMPLE:
172 printf("%lu.%03lu\n",
173 diff.tv_sec,
174 (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
175 break;
176
177 default:
178 /* reaching here is something disaster */
179 fprintf(stderr, "Unknown format:%d\n", bench_format);
180 exit(1);
181 break;
182 }
183
184 return 0;
185}