From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 29 Mar 2007 20:55:58 +0000 (-0800)
Subject: Increase latency histogram resolution
X-Git-Tag: fio-1.15.1~10
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=d0f62ba37546928d3b35b391b7465c6bf8cfe9c5

Increase latency histogram resolution

Currently it was at one decimal, but that can cause us to lose
precision. Always ensure to round up for higher entries of they
get rounded to 0.0 for print.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/stat.c b/stat.c
index 4fe0dbd3..3b8fa367 100644
--- a/stat.c
+++ b/stat.c
@@ -433,6 +433,8 @@ static void stat_calc_dist(struct thread_stat *ts, double *io_u_dist)
 	for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
 		io_u_dist[i] = (double) ts->io_u_map[i] / (double) ts_total_io_u(ts);
 		io_u_dist[i] *= 100.0;
+		if (io_u_dist[i] < 0.1 && ts->io_u_map[i])
+			io_u_dist[i] = 0.1;
 	}
 }
 
@@ -446,6 +448,8 @@ static void stat_calc_lat(struct thread_stat *ts, double *io_u_lat)
 	for (i = 0; i < FIO_IO_U_LAT_NR; i++) {
 		io_u_lat[i] = (double) ts->io_u_lat[i] / (double) ts_total_io_u(ts);
 		io_u_lat[i] *= 100.0;
+		if (io_u_lat[i] < 0.01 && ts->io_u_lat[i])
+			io_u_lat[i] = 0.01;
 	}
 }
 
@@ -529,8 +533,8 @@ static void show_thread_status(struct thread_stat *ts,
 
 	log_info("  IO depths    : 1=%3.1f%%, 2=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%, 16=%3.1f%%, 32=%3.1f%%, >=64=%3.1f%%\n", io_u_dist[0], io_u_dist[1], io_u_dist[2], io_u_dist[3], io_u_dist[4], io_u_dist[5], io_u_dist[6]);
 
-	log_info("     lat (msec): 2=%3.1f%%, 4=%3.1f%%, 10=%3.1f%%, 20=%3.1f%%, 50=%3.1f%%, 100=%3.1f%%\n", io_u_lat[0], io_u_lat[1], io_u_lat[2], io_u_lat[3], io_u_lat[4], io_u_lat[5]);
-	log_info("     lat (msec): 250=%3.1f%%, 500=%3.1f%%, 750=%3.1f%%, 1000=%3.1f%%, >=2000=%3.1f%%\n", io_u_lat[6], io_u_lat[7], io_u_lat[8], io_u_lat[9], io_u_lat[10]);
+	log_info("     lat (msec): 2=%3.2f%%, 4=%3.2f%%, 10=%3.2f%%, 20=%3.2f%%, 50=%3.2f%%, 100=%3.2f%%\n", io_u_lat[0], io_u_lat[1], io_u_lat[2], io_u_lat[3], io_u_lat[4], io_u_lat[5]);
+	log_info("     lat (msec): 250=%3.2f%%, 500=%3.2f%%, 750=%3.2f%%, 1000=%3.2f%%, >=2000=%3.2f%%\n", io_u_lat[6], io_u_lat[7], io_u_lat[8], io_u_lat[9], io_u_lat[10]);
 }
 
 static void show_ddir_status_terse(struct thread_stat *ts,
@@ -595,8 +599,8 @@ static void show_thread_status_terse(struct thread_stat *ts,
 
 	log_info(";%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%", io_u_dist[0], io_u_dist[1], io_u_dist[2], io_u_dist[3], io_u_dist[4], io_u_dist[5], io_u_dist[6]);
 
-	log_info(";%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%\n", io_u_lat[0], io_u_lat[1], io_u_lat[2], io_u_lat[3], io_u_lat[4], io_u_lat[5]);
-	log_info(";%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%", io_u_lat[6], io_u_lat[7], io_u_lat[8], io_u_lat[9], io_u_lat[10]);
+	log_info(";%3.2f%%;%3.2f%%;%3.2f%%;%3.2f%%;%3.2f%%;%3.2f%%\n", io_u_lat[0], io_u_lat[1], io_u_lat[2], io_u_lat[3], io_u_lat[4], io_u_lat[5]);
+	log_info(";%3.2f%%;%3.2f%%;%3.2f%%;%3.2f%%;%3.2f%%", io_u_lat[6], io_u_lat[7], io_u_lat[8], io_u_lat[9], io_u_lat[10]);
 
 	if (ts->description)
 		log_info(";%s", ts->description);