From: Michal Sojka <sojkam1@fel.cvut.cz>
Date: Tue, 4 Feb 2014 17:32:56 +0000 (+0100)
Subject: latester: Add percentiles to statistics
X-Git-Tag: fix-allnoconfig~51
X-Git-Url: http://rtime.felk.cvut.cz/gitweb/can-benchmark.git/commitdiff_plain/a3b8b7b78302d32d42d600ee7342552f29a84f06

latester: Add percentiles to statistics
---

diff --git a/latester/histogram.h b/latester/histogram.h
index 80d629e..b7c1cca 100644
--- a/latester/histogram.h
+++ b/latester/histogram.h
@@ -52,5 +52,41 @@ void histogram_fprint(struct histogram *h, FILE *f)
 }
 
 
+struct histogram_stats {
+	unsigned count;
+	unsigned long long sum;
+	unsigned avg;
+	unsigned percentile[100];
+};
+
+void histogram_stats(struct histogram *h, struct histogram_stats *s)
+{
+	unsigned long long sum;
+	unsigned i, j;
+
+	if (!s)
+		return;
+
+	memset(s, 0, sizeof(*s));
+
+	for (i = 0; i < h->allocated; i++) {
+		s->count += h->data[i];
+		s->sum += h->data[i] * i * h->resolution;
+	}
+	if (s->count == 0)
+		return;
+
+	s->avg = s->sum / s->count;
+
+	for (i = 0, j = 0, sum = 0; i < 100; i++) {
+		while (sum <= i * s->count / 100)
+			sum += h->data[j++];
+
+		s->percentile[i] = (j-1) * h->resolution;
+	}
+	while (sum < i * s->count / 100)
+		sum += h->data[j++];
+	s->percentile[100] = (j-1) * h->resolution;
+}
 
 #endif
diff --git a/latester/latester.c b/latester/latester.c
index 8b1fb86..ff627dc 100644
--- a/latester/latester.c
+++ b/latester/latester.c
@@ -865,6 +865,7 @@ int main(int argc, const char *argv[])
 		fclose(opt.f_msgs);
 
 	if (opt.f_stat) {
+		struct histogram_stats hs;
 		fprintf(opt.f_stat, "cmdline='");
 		for (i=0; i<argc; i++)
 			fprintf(opt.f_stat, "%s%s", argv[i], i < argc-1 ? " " : "");
@@ -872,7 +873,7 @@ int main(int argc, const char *argv[])
 
 		timespec_subtract(&diff, &stats.tac, &stats.tic);
 		fprintf(opt.f_stat, "duration=%s # seconds\n", tstamp_str(NULL, &diff));
-	
+
 		fprintf(opt.f_stat, "sent=%d\n", count);
 		fprintf(opt.f_stat, "overrun=%d\n", stats.overrun);
 		if (stats.overrun && !opt.quiet)
@@ -890,6 +891,12 @@ int main(int argc, const char *argv[])
 		if (stats.timeouts && !opt.quiet)
 			printf("invalid_frame=%d\n", stats.timeouts);
 
+		histogram_stats(&histogram_gw, &hs);
+		double avg = hs.count ? (double)hs.sum/hs.count : 0;
+		fprintf(opt.f_stat, "avg=%g\n", avg);
+		for (i = 0; i <= 20; i++)
+			fprintf(opt.f_stat, "percentile%d=%d\n", i*5, hs.percentile[i*5]);
+
 		fclose(opt.f_stat);
 	}