Commit | Line | Data |
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c7d9300f HM |
1 | /* |
2 | * | |
3 | * builtin-bench-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 | */ | |
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> | |
29 | ||
30 | #define LOOPS_DEFAULT 1000000 | |
31 | static int loops = LOOPS_DEFAULT; | |
32 | static int simple = 0; | |
33 | ||
34 | static const struct option options[] = { | |
35 | OPT_INTEGER('l', "loop", &loops, | |
36 | "Specify number of loops"), | |
37 | OPT_BOOLEAN('s', "simple-output", &simple, | |
38 | "Do simple output (this maybe useful for" | |
39 | "processing by scripts or graph tools like gnuplot)"), | |
40 | OPT_END() | |
41 | }; | |
42 | ||
43 | static const char * const bench_sched_pipe_usage[] = { | |
44 | "perf bench sched pipe <options>", | |
45 | NULL | |
46 | }; | |
47 | ||
48 | int bench_sched_pipe(int argc, const char **argv, | |
49 | const char *prefix __used) | |
50 | { | |
51 | int pipe_1[2], pipe_2[2]; | |
52 | int m = 0, i; | |
53 | struct timeval start, stop, diff; | |
54 | unsigned long long result_usec = 0; | |
55 | ||
56 | /* | |
57 | * why does "ret" exist? | |
58 | * discarding returned value of read(), write() | |
59 | * causes error in building environment for perf | |
60 | */ | |
61 | int ret; | |
62 | pid_t pid; | |
63 | ||
64 | argc = parse_options(argc, argv, options, | |
65 | bench_sched_pipe_usage, 0); | |
66 | ||
67 | assert(!pipe(pipe_1)); | |
68 | assert(!pipe(pipe_2)); | |
69 | ||
70 | pid = fork(); | |
71 | assert(pid >= 0); | |
72 | ||
73 | gettimeofday(&start, NULL); | |
74 | ||
75 | if (!pid) { | |
76 | for (i = 0; i < loops; i++) { | |
77 | ret = read(pipe_1[0], &m, sizeof(int)); | |
78 | ret = write(pipe_2[1], &m, sizeof(int)); | |
79 | } | |
80 | } else { | |
81 | for (i = 0; i < loops; i++) { | |
82 | ret = write(pipe_1[1], &m, sizeof(int)); | |
83 | ret = read(pipe_2[0], &m, sizeof(int)); | |
84 | } | |
85 | } | |
86 | ||
87 | gettimeofday(&stop, NULL); | |
88 | timersub(&stop, &start, &diff); | |
89 | ||
90 | if (pid) | |
91 | return 0; | |
92 | ||
93 | if (simple) | |
94 | printf("%lu.%03lu\n", | |
95 | diff.tv_sec, diff.tv_usec / 1000); | |
96 | else { | |
97 | printf("(executing %d pipe operations between two tasks)\n\n", | |
98 | loops); | |
99 | ||
100 | result_usec = diff.tv_sec * 1000000; | |
101 | result_usec += diff.tv_usec; | |
102 | ||
103 | printf("\tTotal time:%lu.%03lu sec\n", | |
104 | diff.tv_sec, diff.tv_usec / 1000); | |
105 | printf("\t\t%lf usecs/op\n", | |
106 | (double)result_usec / (double)loops); | |
107 | printf("\t\t%d ops/sec\n", | |
108 | (int)((double)loops / | |
109 | ((double)result_usec / (double)1000000))); | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } |