Add a script for calibrating settings for timing configurations.

Update the timings scripts with calibrated settings that run
a full build between 9.5 and 10.0 seconds on the buildbot slave.

1 files changed, 16 insertions, 5 deletions

diff --git a/timings/hundred/TimeSCons-run.py b/timings/hundred/TimeSCons-run.py
index 915c131..c90c26b 100644
--- a/timings/hundred/TimeSCons-run.py
+++ b/timings/hundred/TimeSCons-run.py
@@ -25,15 +25,26 @@
 This configuration is for timing how we handle the NxM interaction when
 we build a lot of targets from a lot of source files.
 
-We create a list of 500 target files that will each be built by copying
-a file from a corresponding list of 500 source files.  The source
-files themselves are each built by a Python function action that's the
-equivalent of "echo contents > $TARGET".
+We create a list of $TARGET_COUNT target files that will each be built by
+copying a file from a corresponding list of $TARGET_COUNT source files.
+The source files themselves are each built by a Python function action
+that's the equivalent of "echo contents > $TARGET".
 """
 
 import TestSCons
 
-test = TestSCons.TimeSCons(variables={'TARGET_COUNT':500})
+# Full-build time of just under 10 seconds on ubuntu-timings slave,
+# as determined by bin/calibrate.py on 9 December 2009:
+#
+# run   1:   3.124:  TARGET_COUNT=50
+# run   2:  11.936:  TARGET_COUNT=160
+# run   3:   9.175:  TARGET_COUNT=134
+# run   4:  10.489:  TARGET_COUNT=146
+# run   5:   9.798:  TARGET_COUNT=139
+# run   6:   9.695:  TARGET_COUNT=139
+# run   7:   9.670:  TARGET_COUNT=139
+
+test = TestSCons.TimeSCons(variables={'TARGET_COUNT':139})
 
 for t in xrange(test.variables['TARGET_COUNT']):
     open('source_%04d' % t, 'wb' ).write('contents\n')