| /* |
| * |
| * builtin-bench-pipe.c |
| * |
| * pipe: Benchmark for pipe() |
| * |
| * Based on pipe-test-1m.c by Ingo Molnar <mingo@redhat.com> |
| * http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test-1m.c |
| * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> |
| * |
| */ |
| |
| #include "../perf.h" |
| #include "../util/util.h" |
| #include "../util/parse-options.h" |
| #include "../builtin.h" |
| #include "bench.h" |
| |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <signal.h> |
| #include <sys/wait.h> |
| #include <linux/unistd.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <assert.h> |
| #include <sys/time.h> |
| |
| #define LOOPS_DEFAULT 1000000 |
| static int loops = LOOPS_DEFAULT; |
| static int simple = 0; |
| |
| static const struct option options[] = { |
| OPT_INTEGER('l', "loop", &loops, |
| "Specify number of loops"), |
| OPT_BOOLEAN('s', "simple-output", &simple, |
| "Do simple output (this maybe useful for" |
| "processing by scripts or graph tools like gnuplot)"), |
| OPT_END() |
| }; |
| |
| static const char * const bench_sched_pipe_usage[] = { |
| "perf bench sched pipe <options>", |
| NULL |
| }; |
| |
| int bench_sched_pipe(int argc, const char **argv, |
| const char *prefix __used) |
| { |
| int pipe_1[2], pipe_2[2]; |
| int m = 0, i; |
| struct timeval start, stop, diff; |
| unsigned long long result_usec = 0; |
| |
| /* |
| * why does "ret" exist? |
| * discarding returned value of read(), write() |
| * causes error in building environment for perf |
| */ |
| int ret; |
| pid_t pid; |
| |
| argc = parse_options(argc, argv, options, |
| bench_sched_pipe_usage, 0); |
| |
| assert(!pipe(pipe_1)); |
| assert(!pipe(pipe_2)); |
| |
| pid = fork(); |
| assert(pid >= 0); |
| |
| gettimeofday(&start, NULL); |
| |
| if (!pid) { |
| for (i = 0; i < loops; i++) { |
| ret = read(pipe_1[0], &m, sizeof(int)); |
| ret = write(pipe_2[1], &m, sizeof(int)); |
| } |
| } else { |
| for (i = 0; i < loops; i++) { |
| ret = write(pipe_1[1], &m, sizeof(int)); |
| ret = read(pipe_2[0], &m, sizeof(int)); |
| } |
| } |
| |
| gettimeofday(&stop, NULL); |
| timersub(&stop, &start, &diff); |
| |
| if (pid) |
| return 0; |
| |
| if (simple) |
| printf("%lu.%03lu\n", |
| diff.tv_sec, diff.tv_usec / 1000); |
| else { |
| printf("(executing %d pipe operations between two tasks)\n\n", |
| loops); |
| |
| result_usec = diff.tv_sec * 1000000; |
| result_usec += diff.tv_usec; |
| |
| printf("\tTotal time:%lu.%03lu sec\n", |
| diff.tv_sec, diff.tv_usec / 1000); |
| printf("\t\t%lf usecs/op\n", |
| (double)result_usec / (double)loops); |
| printf("\t\t%d ops/sec\n", |
| (int)((double)loops / |
| ((double)result_usec / (double)1000000))); |
| } |
| |
| return 0; |
| } |