From: Jens Axboe <axboe@suse.de>
Date: Tue, 8 Nov 2005 09:08:04 +0000 (+0100)
Subject: [PATCH] fio: add cpu usage stats
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=92b229ed5e61f9a07cdb9ee0ed88f3b213776b64;p=disktools.git

[PATCH] fio: add cpu usage stats
---

diff --git a/fio.c b/fio.c
index 271afe5..898e062 100644
--- a/fio.c
+++ b/fio.c
@@ -323,6 +323,8 @@ struct thread_data {
 	struct io_log *bw_log;
 
 	struct timeval start;
+	struct rusage ru_start;
+	struct rusage ru_end;
 
 	struct list_head io_hist_list;
 };
@@ -1638,6 +1640,8 @@ static void *thread_main(int shm_id, int offset, char *argv[])
 
 	gettimeofday(&td->start, NULL);
 
+	getrusage(RUSAGE_SELF, &td->ru_start);
+
 	while (td->loops--) {
 		gettimeofday(&td->stat_sample_time, NULL);
 
@@ -1670,6 +1674,7 @@ static void *thread_main(int shm_id, int offset, char *argv[])
 	}
 
 	td->runtime = mtime_since_now(&td->start);
+	getrusage(RUSAGE_SELF, &td->ru_end);
 	ret = 0;
 
 	if (td->bw_log)
@@ -1728,8 +1733,8 @@ static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
 static void show_thread_status(struct thread_data *td)
 {
 	int prio, prio_class;
-	unsigned long min, max, bw = 0;
-	double mean, dev;
+	unsigned long min, max, bw = 0, ctx;
+	double mean, dev, usr_cpu, sys_cpu;
 
 	if (!td->io_bytes && !td->error)
 		return;
@@ -1748,6 +1753,23 @@ static void show_thread_status(struct thread_data *td)
 		printf("  clat (msec): min=%5lu, max=%5lu, avg=%5.02f, dev=%5.02f\n", min, max, mean, dev);
 	if (calc_lat(&td->bw_stat, &min, &max, &mean, &dev))
 		printf("  bw (KiB/s) : min=%5lu, max=%5lu, avg=%5.02f, dev=%5.02f\n", min, max, mean, dev);
+
+	if (td->runtime) {
+		unsigned long t;
+
+		t = mtime_since(&td->ru_start.ru_utime, &td->ru_end.ru_utime);
+		usr_cpu = (double) t * 100 / (double) td->runtime;
+
+		t = mtime_since(&td->ru_start.ru_stime, &td->ru_end.ru_stime);
+		sys_cpu = (double) t * 100 / (double) td->runtime;
+	} else {
+		usr_cpu = 0;
+		sys_cpu = 0;
+	}
+
+	ctx = td->ru_end.ru_nvcsw + td->ru_end.ru_nivcsw - (td->ru_start.ru_nvcsw + td->ru_start.ru_nivcsw);
+
+	printf("  cpu        : usr=%3.2f%%, sys=%3.2f%%, ctx=%lu\n", usr_cpu, sys_cpu, ctx);
 }
 
 static int setup_rate(struct thread_data *td)