Commit | Line | Data |
---|---|---|
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" | |
13 | #include "../util/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> | |
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> |
c7d9300f | 28 | |
a9faa0ca IM |
29 | #include <pthread.h> |
30 | ||
31 | struct thread_data { | |
32 | int nr; | |
33 | int pipe_read; | |
34 | int pipe_write; | |
35 | pthread_t pthread; | |
36 | }; | |
37 | ||
c7d9300f | 38 | #define LOOPS_DEFAULT 1000000 |
a9faa0ca IM |
39 | static int loops = LOOPS_DEFAULT; |
40 | ||
41 | /* Use processes by default: */ | |
42 | static bool threaded; | |
c7d9300f HM |
43 | |
44 | static const struct option options[] = { | |
a9faa0ca IM |
45 | OPT_INTEGER('l', "loop", &loops, "Specify number of loops"), |
46 | OPT_BOOLEAN('T', "threaded", &threaded, "Specify threads/process based task setup"), | |
c7d9300f HM |
47 | OPT_END() |
48 | }; | |
49 | ||
50 | static const char * const bench_sched_pipe_usage[] = { | |
51 | "perf bench sched pipe <options>", | |
52 | NULL | |
53 | }; | |
54 | ||
a9faa0ca | 55 | static void *worker_thread(void *__tdata) |
c7d9300f | 56 | { |
a9faa0ca | 57 | struct thread_data *td = __tdata; |
c7d9300f | 58 | int m = 0, i; |
a9faa0ca IM |
59 | int ret; |
60 | ||
61 | for (i = 0; i < loops; i++) { | |
62 | if (!td->nr) { | |
63 | ret = read(td->pipe_read, &m, sizeof(int)); | |
64 | BUG_ON(ret != sizeof(int)); | |
65 | ret = write(td->pipe_write, &m, sizeof(int)); | |
66 | BUG_ON(ret != sizeof(int)); | |
67 | } else { | |
68 | ret = write(td->pipe_write, &m, sizeof(int)); | |
69 | BUG_ON(ret != sizeof(int)); | |
70 | ret = read(td->pipe_read, &m, sizeof(int)); | |
71 | BUG_ON(ret != sizeof(int)); | |
72 | } | |
73 | } | |
74 | ||
75 | return NULL; | |
76 | } | |
77 | ||
78 | int bench_sched_pipe(int argc, const char **argv, const char *prefix __maybe_unused) | |
79 | { | |
80 | struct thread_data threads[2], *td; | |
81 | int pipe_1[2], pipe_2[2]; | |
c7d9300f HM |
82 | struct timeval start, stop, diff; |
83 | unsigned long long result_usec = 0; | |
a9faa0ca IM |
84 | int nr_threads = 2; |
85 | int t; | |
c7d9300f HM |
86 | |
87 | /* | |
88 | * why does "ret" exist? | |
89 | * discarding returned value of read(), write() | |
90 | * causes error in building environment for perf | |
91 | */ | |
1d037ca1 IT |
92 | int __maybe_unused ret, wait_stat; |
93 | pid_t pid, retpid __maybe_unused; | |
c7d9300f | 94 | |
a9faa0ca | 95 | argc = parse_options(argc, argv, options, bench_sched_pipe_usage, 0); |
c7d9300f | 96 | |
8bf98b89 IT |
97 | BUG_ON(pipe(pipe_1)); |
98 | BUG_ON(pipe(pipe_2)); | |
c7d9300f | 99 | |
c7d9300f HM |
100 | gettimeofday(&start, NULL); |
101 | ||
a9faa0ca IM |
102 | for (t = 0; t < nr_threads; t++) { |
103 | td = threads + t; | |
104 | ||
105 | td->nr = t; | |
106 | ||
107 | if (t == 0) { | |
108 | td->pipe_read = pipe_1[0]; | |
109 | td->pipe_write = pipe_2[1]; | |
110 | } else { | |
111 | td->pipe_write = pipe_1[1]; | |
112 | td->pipe_read = pipe_2[0]; | |
c7d9300f HM |
113 | } |
114 | } | |
115 | ||
c7d9300f | 116 | |
a9faa0ca IM |
117 | if (threaded) { |
118 | ||
119 | for (t = 0; t < nr_threads; t++) { | |
120 | td = threads + t; | |
121 | ||
122 | ret = pthread_create(&td->pthread, NULL, worker_thread, td); | |
123 | BUG_ON(ret); | |
124 | } | |
125 | ||
126 | for (t = 0; t < nr_threads; t++) { | |
127 | td = threads + t; | |
128 | ||
129 | ret = pthread_join(td->pthread, NULL); | |
130 | BUG_ON(ret); | |
131 | } | |
132 | ||
133 | } else { | |
134 | pid = fork(); | |
135 | assert(pid >= 0); | |
136 | ||
137 | if (!pid) { | |
138 | worker_thread(threads + 0); | |
139 | exit(0); | |
140 | } else { | |
141 | worker_thread(threads + 1); | |
142 | } | |
143 | ||
5ff0cfc6 HM |
144 | retpid = waitpid(pid, &wait_stat, 0); |
145 | assert((retpid == pid) && WIFEXITED(wait_stat)); | |
5ff0cfc6 | 146 | } |
c7d9300f | 147 | |
a9faa0ca IM |
148 | gettimeofday(&stop, NULL); |
149 | timersub(&stop, &start, &diff); | |
150 | ||
158ba827 HM |
151 | switch (bench_format) { |
152 | case BENCH_FORMAT_DEFAULT: | |
a9faa0ca IM |
153 | printf("# Executed %d pipe operations between two %s\n\n", |
154 | loops, threaded ? "threads" : "processes"); | |
c7d9300f HM |
155 | |
156 | result_usec = diff.tv_sec * 1000000; | |
157 | result_usec += diff.tv_usec; | |
158 | ||
ff676b19 | 159 | printf(" %14s: %lu.%03lu [sec]\n\n", "Total time", |
2cd9046c DM |
160 | diff.tv_sec, |
161 | (unsigned long) (diff.tv_usec/1000)); | |
ff676b19 HM |
162 | |
163 | printf(" %14lf usecs/op\n", | |
c7d9300f | 164 | (double)result_usec / (double)loops); |
ff676b19 | 165 | printf(" %14d ops/sec\n", |
c7d9300f HM |
166 | (int)((double)loops / |
167 | ((double)result_usec / (double)1000000))); | |
158ba827 HM |
168 | break; |
169 | ||
170 | case BENCH_FORMAT_SIMPLE: | |
171 | printf("%lu.%03lu\n", | |
2cd9046c DM |
172 | diff.tv_sec, |
173 | (unsigned long) (diff.tv_usec / 1000)); | |
158ba827 HM |
174 | break; |
175 | ||
176 | default: | |
177 | /* reaching here is something disaster */ | |
178 | fprintf(stderr, "Unknown format:%d\n", bench_format); | |
179 | exit(1); | |
180 | break; | |
c7d9300f HM |
181 | } |
182 | ||
183 | return 0; | |
184 | } |