test clock_gettime vs gettimeofday

lib_acl/samples/benchmark/time/Makefile

@@ -0,0 +1,4 @@
+base_path = ../../..
+include ../../Makefile.in
+PROG = time
+CFLAGS += -O0

lib_acl/samples/benchmark/time/main.c

@@ -0,0 +1,80 @@
+#include "lib_acl.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <time.h>
+#include <sys/time.h>
+#include "../stamp.h"
+
+static void usage(const char *proc) {
+	printf("usage: %s -h [help] -n count\r\n", proc);
+}
+
+int main(int argc, char *argv[]) {
+	int ch, i, n = 100;
+	struct timeval begin, end;
+	double cost, speed;
+
+	while ((ch = getopt(argc, argv, "hn:")) > 0) {
+		switch (ch) {
+		case 'h':
+			usage(argv[0]);
+			return 0;
+		case 'n':
+			n = atoi(optarg);
+			break;
+		default:
+			break;
+		}
+	}
+
+	gettimeofday(&begin, NULL);
+
+	for (i = 0; i < n; i++) {
+		struct timeval now;
+		gettimeofday(&now, NULL);
+	}
+
+	gettimeofday(&end, NULL);
+
+	cost = stamp_sub(&end, &begin);
+	speed = (n * 1000) / (cost >= 1.0 ? cost : 1.0);
+	printf("gettimeofday: total count=%d, cost=%.2f ms, speed=%.2f\r\n",
+		n, cost, speed);
+
+	gettimeofday(&begin, NULL);
+
+	for (i = 0; i < n; i++) {
+		//time_t now;
+		//time(&now);
+		struct timespec now;
+		//clock_gettime(CLOCK_REALTIME, &now);
+		clock_gettime(CLOCK_REALTIME_COARSE, &now);
+		//clock_gettime(CLOCK_THREAD_CPUTIME_ID, &now);
+		//clock_gettime(CLOCK_MONOTONIC, &now);
+		//clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
+	}
+
+	gettimeofday(&end, NULL);
+
+	cost = stamp_sub(&end, &begin);
+	speed = (n * 1000) / (cost >= 1.0 ? cost : 1.0);
+	printf("clock_gettime: total count=%d, cost=%.2f ms, speed=%.2f\r\n",
+		n, cost, speed);
+
+	for (i = 0; i < 10; i++) {
+		struct timespec now;
+		long ms;
+
+		clock_gettime(CLOCK_REALTIME_COARSE, &now);
+		ms = now.tv_sec * 1000 + now.tv_nsec / 1000000;
+		printf("now: sec=%ld, nsec=%ld, %ld ms\r\n", now.tv_sec, now.tv_nsec, ms);
+
+		clock_gettime(CLOCK_REALTIME, &now);
+		ms = now.tv_sec * 1000 + now.tv_nsec / 1000000;
+		printf("now: sec=%ld, nsec=%ld, %ld ms\r\n", now.tv_sec, now.tv_nsec, ms);
+		printf("-------------------------------------------------\r\n");
+	}
+
+	return 0;
+}