From 5d291c259322d91633bf237ea60817ca5f8e3438 Mon Sep 17 00:00:00 2001
From: Glauber Costa <glommer@cloudius-systems.com>
Date: Thu, 22 May 2014 19:30:59 +0400
Subject: [PATCH] tests: memcpy benchmark
How log does our memcpy take? misc-memcpy will let you find out
Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
---
build.mk | 1 +
tests/misc-memcpy.c | 88 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 89 insertions(+)
create mode 100644 tests/misc-memcpy.c
diff --git a/build.mk b/build.mk
index ed477f0f9..0208e4ffc 100644
--- a/build.mk
+++ b/build.mk
@@ -319,6 +319,7 @@ tests += tests/misc-tcp-close-without-reading.so
tests += tests/tst-sigwait.so
tests += tests/tst-sampler.so
tests += tests/misc-malloc.so
+tests += tests/misc-memcpy.so
endif
tests/hello/Hello.class: javabase=tests/hello
diff --git a/tests/misc-memcpy.c b/tests/misc-memcpy.c
new file mode 100644
index 000000000..b2b7e86cf
--- /dev/null
+++ b/tests/misc-memcpy.c
@@ -0,0 +1,88 @@
+/*
+* Copyright (C) 2014 Cloudius Systems, Ltd.
+*
+* This work is open source software, licensed under the terms of the
+* BSD license as described in the LICENSE file in the top-level directory.
+*/
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <math.h>
+#include <unistd.h>
+#include <limits.h>
+
+
+#define MIN_SIZE 4
+#define MAX_SIZE (32 << 10)
+#define LOOPS 1000000
+#define RUNS 30
+
+static float vector[RUNS];
+
+static unsigned long gtime()
+{
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ return tv.tv_sec * 1000000000 + tv.tv_usec * 1000;
+}
+
+void test_memcpy(size_t size)
+{
+ void *src = malloc(size);
+ void *dest= malloc(size);
+ int r, i;
+
+ memset(src, 'c', size);
+
+ for (r = 0; r < RUNS; ++r) {
+ unsigned long t1 = gtime();
+ for (i= 0; i < LOOPS; ++i) {
+ memcpy(dest, src, size);
+ }
+ unsigned long t2 = gtime();
+
+ vector[r] = (float)(t2-t1) / LOOPS;
+ }
+
+ float min, max, mean, stdev;
+ min = INT_MAX;
+ max = 0;
+ mean = 0;
+ stdev = 0;
+
+ for (r = 0; r < RUNS; ++r) {
+ mean += vector[r];
+ if (vector[r] < min) {
+ min = vector[r];
+ }
+
+ if (vector[r] > max) {
+ max = vector[r];
+ }
+ }
+ mean = mean / RUNS;
+
+ for (r = 0; r < RUNS; ++r) {
+ float d = vector[r];
+ stdev += (d - mean) * (d - mean);
+ }
+ stdev = sqrtf(stdev / RUNS);
+
+ printf("%d,%f,%f,%f,%f\n", size, min, max, mean, stdev);
+
+ free(src);
+ free(dest);
+}
+
+
+int main()
+{
+ size_t i;
+ for (i = MIN_SIZE; i <= MAX_SIZE; i <<= 1) {
+ test_memcpy(i);
+ }
+
+ return 0;
+}
--
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