hackbench: update measurements

modified the hackbench test suite to run a fixed number of iterations
and added a script called dd_infinite.sh that does the dd part. This is
useful for having relevant measurements, since in idle the performance is
usually good. The results are gathered by hackbench_parse.py which outputs
4 measurements, minimum value, maximum, average and median.

tested on validation.linaro.org, results can be found at
http://validation.linaro.org/scheduler/job/71437

Signed-off-by: Ciprian Barbu <ciprian.barbu@linaro.org>
Acked-by: Fathi Boudra <fathi.boudra@linaro.org>

2 files changed, 29 insertions, 0 deletions

diff --git a/openembedded/scripts/dd_infinite.sh b/openembedded/scripts/dd_infinite.sh
new file mode 100755
index 0000000..5b26f1b
--- /dev/null
+++ b/openembedded/scripts/dd_infinite.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+while true; do dd if=/dev/zero of=bigfile bs=1024000 count=1024; done
+
diff --git a/openembedded/scripts/hackbench_parse.py b/openembedded/scripts/hackbench_parse.py
new file mode 100755
index 0000000..9c31434
--- /dev/null
+++ b/openembedded/scripts/hackbench_parse.py
@@ -0,0 +1,25 @@
+#!/usr/bin/python
+
+import re
+import sys
+from numpy import *
+
+values = []
+
+r = re.compile("Time:\s(?P<measurement>\d+\.\d*)")
+f = open(sys.argv[1], "r")
+for line in f.readlines():
+    search = r.search(line)
+    if search: 
+       values.append(float(search.group('measurement')))
+
+# Usually the first value is inexplicably high
+values.pop(0)
+
+np_array = array(values)
+
+format = "%-16s%-16s%-16s%-16s"
+print format % ("hackbench_min:", str(min(np_array)),    "seconds", "pass")
+print format % ("hakcbench_max:", str(max(np_array)),    "seconds", "pass")
+print format % ("hackbench_avg:", str(mean(np_array)),   "seconds", "pass")
+print format % ("hackbench_mdn:", str(median(np_array)), "seconds", "pass")