--- /dev/null
+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)
--- /dev/null
+/*
+** 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;
+}
--- /dev/null
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := sane_schedstat.c
+
+LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
+LOCAL_MODULE_TAGS := debug
+LOCAL_MODULE := sane_schedstat
+
+include $(BUILD_EXECUTABLE)
--- /dev/null
+/*
+** 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.
+*/
+
+
+/* Opens /proc/sched_stat and diff's the counters.
+ Currently support version 15, modify parse() to support other
+ versions
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sys/uio.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <fcntl.h>
+
+#define MAX_CPU 2
+
+struct cpu_stat {
+ /* sched_yield() stats */
+ unsigned int yld_count; /* sched_yield() called */
+
+ /* schedule() stats */
+ unsigned int sched_switch; /* switched to expired queue and reused it */
+ unsigned int sched_count; /* schedule() called */
+ unsigned int sched_goidle; /* schedule() left the cpu idle */
+
+ /* try_to_wake_up() stats */
+ unsigned int ttwu_count; /* try_to_wake_up() called */
+ /* try_to_wake_up() called and found the process being awakened last ran on
+ * the waking cpu */
+ unsigned int ttwu_local;
+
+ /* latency stats */
+ unsigned long long cpu_time; /* time spent running by tasks (ms) */
+ unsigned long long run_delay; /* time spent waiting to run by tasks (ms) */
+ unsigned long pcount; /* number of tasks (not necessarily unique) given */
+};
+
+struct cpu_stat cpu_prev[MAX_CPU];
+struct cpu_stat cpu_delta[MAX_CPU];
+struct cpu_stat tmp;
+
+static const char *next_line(const char *b) {
+ while (1) {
+ switch (*b) {
+ case '\n':
+ return b + 1;
+ case '\0':
+ return NULL;
+ }
+ b++;
+ }
+}
+static int print() {
+ int i;
+
+ printf("CPU yield() schedule() switch idle ttwu() local cpu_time wait_time timeslices\n");
+ for (i=0; i<MAX_CPU; i++) {
+ printf(" %2d %7u %10u %6u %4u %8u %5u %9llu %9llu %10lu\n",
+ i,
+ cpu_delta[i].yld_count,
+ cpu_delta[i].sched_count, cpu_delta[i].sched_switch, cpu_delta[i].sched_goidle,
+ cpu_delta[i].ttwu_count, cpu_delta[i].ttwu_local,
+ cpu_delta[i].cpu_time / 1000000, cpu_delta[i].run_delay / 1000000, cpu_delta[i].pcount);
+ }
+ return 0;
+}
+
+static int parse_cpu_v15(const char *b) {
+ int cpu;
+
+ if (sscanf(b, "cpu%d %u %u %u %u %u %u %llu %llu %lu\n",
+ &cpu, &tmp.yld_count,
+ &tmp.sched_switch, &tmp.sched_count, &tmp.sched_goidle,
+ &tmp.ttwu_count, &tmp.ttwu_local,
+ &tmp.cpu_time, &tmp.run_delay, &tmp.pcount) != 10) {
+ printf("Could not parse %s\n", b);
+ return -1;
+ }
+
+ cpu_delta[cpu].yld_count = tmp.yld_count - cpu_prev[cpu].yld_count;
+ cpu_delta[cpu].sched_switch = tmp.sched_switch - cpu_prev[cpu].sched_switch;
+ cpu_delta[cpu].sched_count = tmp.sched_count - cpu_prev[cpu].sched_count;
+ cpu_delta[cpu].sched_goidle = tmp.sched_goidle - cpu_prev[cpu].sched_goidle;
+ cpu_delta[cpu].ttwu_count = tmp.ttwu_count - cpu_prev[cpu].ttwu_count;
+ cpu_delta[cpu].ttwu_local = tmp.ttwu_local - cpu_prev[cpu].ttwu_local;
+ cpu_delta[cpu].cpu_time = tmp.cpu_time - cpu_prev[cpu].cpu_time;
+ cpu_delta[cpu].run_delay = tmp.run_delay - cpu_prev[cpu].run_delay;
+ cpu_delta[cpu].pcount = tmp.pcount - cpu_prev[cpu].pcount;
+
+ cpu_prev[cpu] = tmp;
+ return 0;
+}
+
+
+static int parse(const char *b) {
+ unsigned int version;
+ unsigned long long ts;
+
+ if (sscanf(b, "version %u\n", &version) != 1) {
+ printf("Could not parse version\n");
+ return -1;
+ }
+ switch (version) {
+ case 15:
+ b = next_line(b);
+ if (!b || sscanf(b, "timestamp %llu\n", &ts) != 1) {
+ printf("Could not parse timestamp\n");
+ return -1;
+ }
+ while (1) {
+ b = next_line(b);
+ if (!b) break;
+ if (b[0] == 'c') {
+ if (parse_cpu_v15(b)) return -1;
+ }
+ }
+ break;
+ default:
+ printf("Can not handle version %u\n", version);
+ return -1;
+ }
+ return 0;
+}
+
+int main(int argc, char **argv) {
+ int i;
+ int fd;
+ char buf[4096];
+
+ while (1) {
+ fd = open("/proc/schedstat", O_RDONLY);
+ if (fd < 0) return -1;
+ i = read(fd, buf, sizeof(buf) - 1);
+ close(fd);
+ buf[i] = '\0';
+ if (parse(buf)) return -1;
+ print();
+ sleep(1);
+ }
+ return 0;
+}
OSDN Git Service
