schbench: make percentiles printing prettier

Align numbers and highlight the 99.0%'s asterisk.

Print this:

Latency percentiles (usec) runtime 30 (s) (670 total samples)
	  50.0th: 95872      (345 samples)
	  75.0th: 115584     (158 samples)
	  90.0th: 129664     (103 samples)
	  95.0th: 132352     (34 samples)
	* 99.0th: 135424     (25 samples)
	  99.5th: 135936     (2 samples)
	  99.9th: 139008     (3 samples)
	  min=26024, max=138760

instead of:

Latency percentiles (usec) runtime 30 (s) (4005 total samples)
	50.0th: 40 (2032 samples)
	75.0th: 1410 (972 samples)
	90.0th: 2868 (601 samples)
	95.0th: 4312 (229 samples)
	*99.0th: 12272 (131 samples)
	99.5th: 12944 (20 samples)
	99.9th: 18720 (16 samples)
	min=6, max=23405

Signed-off-by: Roman Gushchin <guro@fb.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/schbench.c b/schbench.c
index 89aa3bb..a257105 100644
--- a/schbench.c
+++ b/schbench.c
@@ -408,8 +408,8 @@ static void show_latencies(struct stats *s, unsigned long long runtime)
 	if (len) {
 		fprintf(stderr, "Latency percentiles (usec) runtime %llu (s) (%lu total samples)\n", runtime, s->nr_samples);
 		for (i = 0; i < len; i++)
-			fprintf(stderr, "\t%s%2.1fth: %u (%lu samples)\n",
-				i == PLIST_P99 ? "*" : "",
+			fprintf(stderr, "\t%s%2.1fth: %-10u (%lu samples)\n",
+				i == PLIST_P99 ? "* " : "  ",
 				plist[i], ovals[i], ocounts[i]);
 	}
 
@@ -418,7 +418,7 @@ static void show_latencies(struct stats *s, unsigned long long runtime)
 	if (ocounts)
 		free(ocounts);
 
-	fprintf(stderr, "\tmin=%u, max=%u\n", s->min, s->max);
+	fprintf(stderr, "\t  min=%u, max=%u\n", s->min, s->max);
 }
 
 /* fold latency info from s into d */