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authorHitoshi Mitake <mitake@dcl.info.waseda.ac.jp>2009-11-05 09:31:33 +0900
committerIngo Molnar <mingo@elte.hu>2009-11-08 10:19:18 +0100
commitc7d9300f367f480aee4663a0e3695c5b48859a1a (patch)
tree3377b76fd126f5fb075183151de62a6f0b7aa724 /tools/perf/bench/sched-pipe.c
parente27454cc6352c4226ddc76f5e3a5dedd7dff456a (diff)
downloadlinux-c7d9300f367f480aee4663a0e3695c5b48859a1a.tar.gz
perf bench: Add sched-pipe.c: Benchmark for pipe() system call
This patch adds bench/sched-pipe.c. bench/sched-pipe.c is a benchmark program to measure performance of pipe() system call. This benchmark is based on pipe-test-1m.c by Ingo Molnar: http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test-1m.c Example of use: % perf bench sched pipe (executing 1000000 pipe operations between two tasks) Total time:4.499 sec 4.499179 usecs/op 222262 ops/sec % perf bench sched pipe -s -l 1000 0.015 Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: fweisbec@gmail.com Cc: Jiri Kosina <jkosina@suse.cz> LKML-Reference: <1257381097-4743-4-git-send-email-mitake@dcl.info.waseda.ac.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/bench/sched-pipe.c')
-rw-r--r--tools/perf/bench/sched-pipe.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/tools/perf/bench/sched-pipe.c b/tools/perf/bench/sched-pipe.c
new file mode 100644
index 000000000000..3214ed20b1aa
--- /dev/null
+++ b/tools/perf/bench/sched-pipe.c
@@ -0,0 +1,113 @@
+/*
+ *
+ * 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;
+}