Add a couple of performance debug utilities.

micro_bench provides very simple tests for
o sleep accuracy
o cpu
o memcpy
o memset

sane_schedstat is a front-end for /proc/schedstat to diff and format the
counters.

Change-Id: I6e178fe37fcfc9bf0a83ec17852e31146a91e7a4
Signed-off-by: Nick Pelly <npelly@google.com>

2 files changed, 198 insertions, 0 deletions

diff --git a/micro_bench/Android.mk b/micro_bench/Android.mk
new file mode 100644
index 00000000..0e819c37
--- /dev/null
+++ b/micro_bench/Android.mk
@@ -0,0 +1,10 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := micro_bench.c
+
+LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
+LOCAL_MODULE_TAGS := debug
+LOCAL_MODULE := micro_bench
+
+include $(BUILD_EXECUTABLE)
diff --git a/micro_bench/micro_bench.c b/micro_bench/micro_bench.c
new file mode 100644
index 00000000..c67a52fa
--- /dev/null
+++ b/micro_bench/micro_bench.c
@@ -0,0 +1,188 @@
+/*
+** Copyright 2010 The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+/*
+ * Some quick and dirty micro-benchmarks
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sys/uio.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+/* tv2 -= tv1 */
+static void tv_sub(struct timeval *tv2, struct timeval *tv1) {
+        tv2->tv_sec -= tv1->tv_sec;
+        tv2->tv_usec -= tv1->tv_usec;
+        while (tv2->tv_usec < 0) {
+            tv2->tv_usec += 1000000;
+            tv2->tv_sec -= 1;
+        }
+}
+
+static int do_sleep(int delay) {
+    struct timeval tv1;
+    struct timeval tv2;
+
+    while (1) {
+        gettimeofday(&tv1, NULL);
+        sleep(delay);
+        gettimeofday(&tv2, NULL);
+
+        tv_sub(&tv2, &tv1);
+
+        printf("sleep(%d) took %ld.%06ld seconds\n", delay, tv2.tv_sec, tv2.tv_usec);
+    }
+
+    return 0;
+}
+
+int cpu_foo;
+
+static int do_cpu(int a) {
+    struct timeval tv1;
+    struct timeval tv2;
+
+    while (1) {
+        gettimeofday(&tv1, NULL);
+        for (cpu_foo = 0; cpu_foo < 100000000; cpu_foo++);
+        gettimeofday(&tv2, NULL);
+
+        tv_sub(&tv2, &tv1);
+
+        printf("cpu took %ld.%06ld seconds\n", tv2.tv_sec, tv2.tv_usec);
+    }
+    return 0;
+}
+
+static double mb_sec(unsigned long bytes, struct timeval *delta) {
+    unsigned long us = delta->tv_sec * 1000000 + delta->tv_usec;
+    return (double)bytes * 1000000.0 / 1048576.0 / (double)us;
+}
+
+static int do_memset(int sz) {
+    struct timeval tv1;
+    struct timeval tv2;
+    int i;
+
+    uint8_t *b = malloc(sz);
+    if (!b) return -1;
+    int c = 1000000000/sz;
+
+    while (1) {
+        gettimeofday(&tv1, NULL);
+        for (i = 0; i < c; i++)
+            memset(b, 0, sz);
+
+        gettimeofday(&tv2, NULL);
+
+        tv_sub(&tv2, &tv1);
+
+        printf("memset %dx%d bytes took %ld.%06ld seconds (%f MB/s)\n", c, sz, tv2.tv_sec, tv2.tv_usec, mb_sec(c*sz, &tv2));
+    }
+    return 0;
+}
+
+static int do_memcpy(int sz) {
+    struct timeval tv1;
+    struct timeval tv2;
+    int i;
+
+    uint8_t *a = malloc(sz);
+    if (!a) return -1;
+    uint8_t *b = malloc(sz);
+    if (!b) return -1;
+    int c = 1000000000/sz;
+
+    while (1) {
+        gettimeofday(&tv1, NULL);
+        for (i = 0; i < c; i++)
+            memcpy(b, a, sz);
+
+        gettimeofday(&tv2, NULL);
+
+        tv_sub(&tv2, &tv1);
+
+        printf("memcpy %dx%d bytes took %ld.%06ld seconds (%f MB/s)\n", c, sz, tv2.tv_sec, tv2.tv_usec, mb_sec(c*sz, &tv2));
+    }
+    return 0;
+}
+
+int foo;
+
+static int do_memread(int sz) {
+    struct timeval tv1;
+    struct timeval tv2;
+    int i, j;
+
+    int *b = malloc(sz);
+    if (!b) return -1;
+    int c = 1000000000/sz;
+
+    while (1) {
+        gettimeofday(&tv1, NULL);
+        for (i = 0; i < c; i++)
+            for (j = 0; j < sz/4; j++)
+                foo = b[j];
+
+        gettimeofday(&tv2, NULL);
+
+        tv_sub(&tv2, &tv1);
+
+        printf("read %dx%d bytes took %ld.%06ld seconds (%f MB/s)\n", c, sz, tv2.tv_sec, tv2.tv_usec, mb_sec(c*sz, &tv2));
+    }
+    return 0;
+}
+
+struct {
+    char *name;
+    int (*ptr)(int);
+} function_table[]  = {
+    {"sleep", do_sleep},
+    {"cpu", do_cpu},
+    {"memset", do_memset},
+    {"memcpy", do_memcpy},
+    {"memread", do_memread},
+    {NULL, NULL},
+};
+
+static void usage() {
+    int i;
+
+    printf("Usage:\n");
+    for (i = 0; function_table[i].name; i++) {
+        printf("\tmicro_bench %s ARG\n", function_table[i].name);
+    }
+}
+
+int main(int argc, char **argv) {
+    int i;
+
+    if (argc != 3) {
+        usage();
+        return -1;
+    }
+    for (i = 0; function_table[i].name; i++) {
+        if (!strcmp(argv[1], function_table[i].name)) {
+            printf("%s\n", function_table[i].name);
+            return (*function_table[i].ptr)(atoi(argv[2]));
+        }
+    }
+    usage();
+    return -1;
+}