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 4fe0dbd3dd65a9a129c9a6951bfe9e9bdae3754a..3b8fa367c2a936e7fb9d918b2872b4216feb6100 100644 (file)
--- 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);