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12#include "../perf.h"
13#include "../util/util.h"
14#include <subcmd/parse-options.h>
15#include "../builtin.h"
16#include "bench.h"
17
18#include <unistd.h>
19#include <stdio.h>
20#include <stdlib.h>
21#include <signal.h>
22#include <sys/wait.h>
23#include <string.h>
24#include <errno.h>
25#include <assert.h>
26#include <sys/time.h>
27#include <sys/types.h>
28#include <sys/syscall.h>
29#include <linux/time64.h>
30
31#include <pthread.h>
32
33struct thread_data {
34 int nr;
35 int pipe_read;
36 int pipe_write;
37 pthread_t pthread;
38};
39
40#define LOOPS_DEFAULT 1000000
41static int loops = LOOPS_DEFAULT;
42
43
44static bool threaded;
45
46static const struct option options[] = {
47 OPT_INTEGER('l', "loop", &loops, "Specify number of loops"),
48 OPT_BOOLEAN('T', "threaded", &threaded, "Specify threads/process based task setup"),
49 OPT_END()
50};
51
52static const char * const bench_sched_pipe_usage[] = {
53 "perf bench sched pipe <options>",
54 NULL
55};
56
57static void *worker_thread(void *__tdata)
58{
59 struct thread_data *td = __tdata;
60 int m = 0, i;
61 int ret;
62
63 for (i = 0; i < loops; i++) {
64 if (!td->nr) {
65 ret = read(td->pipe_read, &m, sizeof(int));
66 BUG_ON(ret != sizeof(int));
67 ret = write(td->pipe_write, &m, sizeof(int));
68 BUG_ON(ret != sizeof(int));
69 } else {
70 ret = write(td->pipe_write, &m, sizeof(int));
71 BUG_ON(ret != sizeof(int));
72 ret = read(td->pipe_read, &m, sizeof(int));
73 BUG_ON(ret != sizeof(int));
74 }
75 }
76
77 return NULL;
78}
79
80int bench_sched_pipe(int argc, const char **argv)
81{
82 struct thread_data threads[2], *td;
83 int pipe_1[2], pipe_2[2];
84 struct timeval start, stop, diff;
85 unsigned long long result_usec = 0;
86 int nr_threads = 2;
87 int t;
88
89
90
91
92
93
94 int __maybe_unused ret, wait_stat;
95 pid_t pid, retpid __maybe_unused;
96
97 argc = parse_options(argc, argv, options, bench_sched_pipe_usage, 0);
98
99 BUG_ON(pipe(pipe_1));
100 BUG_ON(pipe(pipe_2));
101
102 gettimeofday(&start, NULL);
103
104 for (t = 0; t < nr_threads; t++) {
105 td = threads + t;
106
107 td->nr = t;
108
109 if (t == 0) {
110 td->pipe_read = pipe_1[0];
111 td->pipe_write = pipe_2[1];
112 } else {
113 td->pipe_write = pipe_1[1];
114 td->pipe_read = pipe_2[0];
115 }
116 }
117
118
119 if (threaded) {
120
121 for (t = 0; t < nr_threads; t++) {
122 td = threads + t;
123
124 ret = pthread_create(&td->pthread, NULL, worker_thread, td);
125 BUG_ON(ret);
126 }
127
128 for (t = 0; t < nr_threads; t++) {
129 td = threads + t;
130
131 ret = pthread_join(td->pthread, NULL);
132 BUG_ON(ret);
133 }
134
135 } else {
136 pid = fork();
137 assert(pid >= 0);
138
139 if (!pid) {
140 worker_thread(threads + 0);
141 exit(0);
142 } else {
143 worker_thread(threads + 1);
144 }
145
146 retpid = waitpid(pid, &wait_stat, 0);
147 assert((retpid == pid) && WIFEXITED(wait_stat));
148 }
149
150 gettimeofday(&stop, NULL);
151 timersub(&stop, &start, &diff);
152
153 switch (bench_format) {
154 case BENCH_FORMAT_DEFAULT:
155 printf("# Executed %d pipe operations between two %s\n\n",
156 loops, threaded ? "threads" : "processes");
157
158 result_usec = diff.tv_sec * USEC_PER_SEC;
159 result_usec += diff.tv_usec;
160
161 printf(" %14s: %lu.%03lu [sec]\n\n", "Total time",
162 diff.tv_sec,
163 (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
164
165 printf(" %14lf usecs/op\n",
166 (double)result_usec / (double)loops);
167 printf(" %14d ops/sec\n",
168 (int)((double)loops /
169 ((double)result_usec / (double)USEC_PER_SEC)));
170 break;
171
172 case BENCH_FORMAT_SIMPLE:
173 printf("%lu.%03lu\n",
174 diff.tv_sec,
175 (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
176 break;
177
178 default:
179
180 fprintf(stderr, "Unknown format:%d\n", bench_format);
181 exit(1);
182 break;
183 }
184
185 return 0;
186}
187
