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Commit | Line | Data |
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c7d9300f HM |
1 | /* |
2 | * | |
2044279d | 3 | * sched-pipe.c |
c7d9300f HM |
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> | |
c7d9300f | 10 | */ |
c7d9300f HM |
11 | #include "../perf.h" |
12 | #include "../util/util.h" | |
4b6ab94e | 13 | #include <subcmd/parse-options.h> |
c7d9300f HM |
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> | |
c7d9300f HM |
22 | #include <string.h> |
23 | #include <errno.h> | |
24 | #include <assert.h> | |
25 | #include <sys/time.h> | |
5ff0cfc6 | 26 | #include <sys/types.h> |
ea1fe3a8 | 27 | #include <sys/syscall.h> |
16633ccf | 28 | #include <linux/time64.h> |
c7d9300f | 29 | |
a9faa0ca IM |
30 | #include <pthread.h> |
31 | ||
32 | struct thread_data { | |
33 | int nr; | |
34 | int pipe_read; | |
35 | int pipe_write; | |
36 | pthread_t pthread; | |
37 | }; | |
38 | ||
c7d9300f | 39 | #define LOOPS_DEFAULT 1000000 |
a9faa0ca IM |
40 | static int loops = LOOPS_DEFAULT; |
41 | ||
42 | /* Use processes by default: */ | |
43 | static bool threaded; | |
c7d9300f HM |
44 | |
45 | static const struct option options[] = { | |
a9faa0ca IM |
46 | OPT_INTEGER('l', "loop", &loops, "Specify number of loops"), |
47 | OPT_BOOLEAN('T', "threaded", &threaded, "Specify threads/process based task setup"), | |
c7d9300f HM |
48 | OPT_END() |
49 | }; | |
50 | ||
51 | static const char * const bench_sched_pipe_usage[] = { | |
52 | "perf bench sched pipe <options>", | |
53 | NULL | |
54 | }; | |
55 | ||
a9faa0ca | 56 | static void *worker_thread(void *__tdata) |
c7d9300f | 57 | { |
a9faa0ca | 58 | struct thread_data *td = __tdata; |
c7d9300f | 59 | int m = 0, i; |
a9faa0ca IM |
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 | ||
79 | int 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]; | |
c7d9300f HM |
83 | struct timeval start, stop, diff; |
84 | unsigned long long result_usec = 0; | |
a9faa0ca IM |
85 | int nr_threads = 2; |
86 | int t; | |
c7d9300f HM |
87 | |
88 | /* | |
89 | * why does "ret" exist? | |
90 | * discarding returned value of read(), write() | |
91 | * causes error in building environment for perf | |
92 | */ | |
1d037ca1 IT |
93 | int __maybe_unused ret, wait_stat; |
94 | pid_t pid, retpid __maybe_unused; | |
c7d9300f | 95 | |
a9faa0ca | 96 | argc = parse_options(argc, argv, options, bench_sched_pipe_usage, 0); |
c7d9300f | 97 | |
8bf98b89 IT |
98 | BUG_ON(pipe(pipe_1)); |
99 | BUG_ON(pipe(pipe_2)); | |
c7d9300f | 100 | |
c7d9300f HM |
101 | gettimeofday(&start, NULL); |
102 | ||
a9faa0ca IM |
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]; | |
c7d9300f HM |
114 | } |
115 | } | |
116 | ||
c7d9300f | 117 | |
a9faa0ca IM |
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 | ||
5ff0cfc6 HM |
145 | retpid = waitpid(pid, &wait_stat, 0); |
146 | assert((retpid == pid) && WIFEXITED(wait_stat)); | |
5ff0cfc6 | 147 | } |
c7d9300f | 148 | |
a9faa0ca IM |
149 | gettimeofday(&stop, NULL); |
150 | timersub(&stop, &start, &diff); | |
151 | ||
158ba827 HM |
152 | switch (bench_format) { |
153 | case BENCH_FORMAT_DEFAULT: | |
a9faa0ca IM |
154 | printf("# Executed %d pipe operations between two %s\n\n", |
155 | loops, threaded ? "threads" : "processes"); | |
c7d9300f | 156 | |
16633ccf | 157 | result_usec = diff.tv_sec * USEC_PER_SEC; |
c7d9300f HM |
158 | result_usec += diff.tv_usec; |
159 | ||
ff676b19 | 160 | printf(" %14s: %lu.%03lu [sec]\n\n", "Total time", |
2cd9046c | 161 | diff.tv_sec, |
16633ccf | 162 | (unsigned long) (diff.tv_usec / USEC_PER_MSEC)); |
ff676b19 HM |
163 | |
164 | printf(" %14lf usecs/op\n", | |
c7d9300f | 165 | (double)result_usec / (double)loops); |
ff676b19 | 166 | printf(" %14d ops/sec\n", |
c7d9300f | 167 | (int)((double)loops / |
16633ccf | 168 | ((double)result_usec / (double)USEC_PER_SEC))); |
158ba827 HM |
169 | break; |
170 | ||
171 | case BENCH_FORMAT_SIMPLE: | |
172 | printf("%lu.%03lu\n", | |
2cd9046c | 173 | diff.tv_sec, |
16633ccf | 174 | (unsigned long) (diff.tv_usec / USEC_PER_MSEC)); |
158ba827 HM |
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; | |
c7d9300f HM |
182 | } |
183 | ||
184 | return 0; | |
185 | } |