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Message-Id: <20091103.133927.580735811043340004.mitake@dcl.info.waseda.ac.jp>
Date: Tue, 03 Nov 2009 13:39:27 +0900 (JST)
From: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org,
Rusty Russell <rusty@...tcorp.com.au>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Mike Galbraith <efault@....de>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Frédéric_Weisbecker <fweisbec@...il.com>
Subject: [RFC][PATCH 7/7] Adding general performance benchmarking subsystem
to perf.
Adding general performance benchmarking subsystem to perf.
This patch adds builtin-bench-pipe.c
builtin-bench-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
Signed-off-by: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
---
tools/perf/builtin-bench-pipe.c | 89 +++++++++++++++++++++++++++++++++++++++
1 files changed, 89 insertions(+), 0 deletions(-)
create mode 100644 tools/perf/builtin-bench-pipe.c
diff --git a/tools/perf/builtin-bench-pipe.c b/tools/perf/builtin-bench-pipe.c
new file mode 100644
index 0000000..081515e
--- /dev/null
+++ b/tools/perf/builtin-bench-pipe.c
@@ -0,0 +1,89 @@
+/*
+ *
+ * builtin-bench-pipe.c
+ *
+ * pipe: Benchmark for pipe()
+ *
+ * Based on pipe-test-1m.c by Ingo Molnar <mingo@...hat.com>
+ * http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test-1m.c
+ * Ported to perf by Hitoshi Mitake <mitake@....info.waseda.ac.jp>
+ *
+ */
+
+#include "perf.h"
+#include "util/util.h"
+#include "util/parse-options.h"
+#include "builtin.h"
+#include "bench-suite.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 const struct option options[] = {
+ OPT_INTEGER('l', "loop", &loops,
+ "Specify number of loops"),
+ 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;
+
+ /*
+ * why does "ret" exists?
+ * 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 if (pid > 0) {
+ 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)
+ printf("%lu.%03lu\n",
+ diff.tv_sec, diff.tv_usec/1000);
+
+ return 0;
+}
--
1.5.6.5
--
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