[CalendarServer-changes] [6163] CalendarServer/trunk/contrib/performance/compare.py
source_changes at macosforge.org
source_changes at macosforge.org
Fri Aug 20 14:05:16 PDT 2010
Revision: 6163
http://trac.macosforge.org/projects/calendarserver/changeset/6163
Author: exarkun at twistedmatrix.com
Date: 2010-08-20 14:05:16 -0700 (Fri, 20 Aug 2010)
Log Message:
-----------
use a 10% trimmed mean to improve t-test robustness, with obviously beneficial results
Modified Paths:
--------------
CalendarServer/trunk/contrib/performance/compare.py
Modified: CalendarServer/trunk/contrib/performance/compare.py
===================================================================
--- CalendarServer/trunk/contrib/performance/compare.py 2010-08-20 21:04:44 UTC (rev 6162)
+++ CalendarServer/trunk/contrib/performance/compare.py 2010-08-20 21:05:16 UTC (rev 6163)
@@ -22,9 +22,26 @@
[p, None])
+def trim(sequence, amount):
+ sequence.sort()
+ n = len(sequence)
+ t = int(n * amount / 2.0)
+ if t:
+ del sequence[:t]
+ del sequence[-t:]
+ else:
+ raise RuntimeError(
+ "Cannot trim length %d sequence by %d%%" % (n, int(amount * 100)))
+ return sequence
+
+
def main():
[(stat, first), (stat, second)] = load_stats(sys.argv[1:])
+ # Attempt to increase robustness by dropping the outlying 10% of values.
+ first = trim(first, 0.1)
+ second = trim(second, 0.1)
+
fmean = stats.mean(first)
smean = stats.mean(second)
p = 1 - ttest_1samp(second, fmean)[1][0]
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.macosforge.org/pipermail/calendarserver-changes/attachments/20100820/187b2a6a/attachment.html>
More information about the calendarserver-changes
mailing list