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> | |
10 | * | |
11 | */ | |
12 | ||
13 | #include "../perf.h" | |
14 | #include "../util/util.h" | |
15 | #include "../util/parse-options.h" | |
16 | #include "../builtin.h" | |
17 | #include "bench.h" | |
18 | ||
19 | #include <unistd.h> | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <signal.h> | |
23 | #include <sys/wait.h> | |
24 | #include <linux/unistd.h> | |
25 | #include <string.h> | |
26 | #include <errno.h> | |
27 | #include <assert.h> | |
28 | #include <sys/time.h> | |
5ff0cfc6 | 29 | #include <sys/types.h> |
c7d9300f HM |
30 | |
31 | #define LOOPS_DEFAULT 1000000 | |
32 | static int loops = LOOPS_DEFAULT; | |
c7d9300f HM |
33 | |
34 | static const struct option options[] = { | |
35 | OPT_INTEGER('l', "loop", &loops, | |
36 | "Specify number of loops"), | |
c7d9300f HM |
37 | OPT_END() |
38 | }; | |
39 | ||
40 | static const char * const bench_sched_pipe_usage[] = { | |
41 | "perf bench sched pipe <options>", | |
42 | NULL | |
43 | }; | |
44 | ||
45 | int bench_sched_pipe(int argc, const char **argv, | |
46 | const char *prefix __used) | |
47 | { | |
48 | int pipe_1[2], pipe_2[2]; | |
49 | int m = 0, i; | |
50 | struct timeval start, stop, diff; | |
51 | unsigned long long result_usec = 0; | |
52 | ||
53 | /* | |
54 | * why does "ret" exist? | |
55 | * discarding returned value of read(), write() | |
56 | * causes error in building environment for perf | |
57 | */ | |
5ff0cfc6 HM |
58 | int ret, wait_stat; |
59 | pid_t pid, retpid; | |
c7d9300f HM |
60 | |
61 | argc = parse_options(argc, argv, options, | |
62 | bench_sched_pipe_usage, 0); | |
63 | ||
64 | assert(!pipe(pipe_1)); | |
65 | assert(!pipe(pipe_2)); | |
66 | ||
67 | pid = fork(); | |
68 | assert(pid >= 0); | |
69 | ||
70 | gettimeofday(&start, NULL); | |
71 | ||
72 | if (!pid) { | |
73 | for (i = 0; i < loops; i++) { | |
74 | ret = read(pipe_1[0], &m, sizeof(int)); | |
75 | ret = write(pipe_2[1], &m, sizeof(int)); | |
76 | } | |
77 | } else { | |
78 | for (i = 0; i < loops; i++) { | |
79 | ret = write(pipe_1[1], &m, sizeof(int)); | |
80 | ret = read(pipe_2[0], &m, sizeof(int)); | |
81 | } | |
82 | } | |
83 | ||
84 | gettimeofday(&stop, NULL); | |
85 | timersub(&stop, &start, &diff); | |
86 | ||
5ff0cfc6 HM |
87 | if (pid) { |
88 | retpid = waitpid(pid, &wait_stat, 0); | |
89 | assert((retpid == pid) && WIFEXITED(wait_stat)); | |
2044279d HM |
90 | } else { |
91 | exit(0); | |
5ff0cfc6 | 92 | } |
c7d9300f | 93 | |
158ba827 HM |
94 | switch (bench_format) { |
95 | case BENCH_FORMAT_DEFAULT: | |
ff676b19 | 96 | printf("# Extecuted %d pipe operations between two tasks\n\n", |
c7d9300f HM |
97 | loops); |
98 | ||
99 | result_usec = diff.tv_sec * 1000000; | |
100 | result_usec += diff.tv_usec; | |
101 | ||
ff676b19 HM |
102 | printf(" %14s: %lu.%03lu [sec]\n\n", "Total time", |
103 | diff.tv_sec, diff.tv_usec/1000); | |
104 | ||
105 | printf(" %14lf usecs/op\n", | |
c7d9300f | 106 | (double)result_usec / (double)loops); |
ff676b19 | 107 | printf(" %14d ops/sec\n", |
c7d9300f HM |
108 | (int)((double)loops / |
109 | ((double)result_usec / (double)1000000))); | |
158ba827 HM |
110 | break; |
111 | ||
112 | case BENCH_FORMAT_SIMPLE: | |
113 | printf("%lu.%03lu\n", | |
114 | diff.tv_sec, diff.tv_usec / 1000); | |
115 | break; | |
116 | ||
117 | default: | |
118 | /* reaching here is something disaster */ | |
119 | fprintf(stderr, "Unknown format:%d\n", bench_format); | |
120 | exit(1); | |
121 | break; | |
c7d9300f HM |
122 | } |
123 | ||
124 | return 0; | |
125 | } |