diff options
Diffstat (limited to 'timings/JTimer/TimeSCons-run.py')
| -rw-r--r-- | timings/JTimer/TimeSCons-run.py | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/timings/JTimer/TimeSCons-run.py b/timings/JTimer/TimeSCons-run.py index 05ffbfb..7fe1bf4 100644 --- a/timings/JTimer/TimeSCons-run.py +++ b/timings/JTimer/TimeSCons-run.py @@ -25,10 +25,10 @@ This configuration is for timing how we evaluate long chains of dependencies, specifically when -j is used. -We set up a chain of 500 targets that get built from a Python function -action with no source files (equivalent to "echo junk > $TARGET"). -Each target explicitly depends on the next target in turn, so the -Taskmaster will do a deep walk of the dependency graph. +We set up a chain of $TARGET_COUNT targets that get built from a +Python function action with no source files (equivalent to "echo junk > +$TARGET"). Each target explicitly depends on the next target in turn, +so the Taskmaster will do a deep walk of the dependency graph. This test case was contributed by Kevin Massey. Prior to revision 1468, we had a serious O(N^2) problem in the Taskmaster when handling long @@ -38,7 +38,26 @@ to the Taskmaster so it could be smarter about not re-evaluating Nodes. 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: 3.211: TARGET_COUNT=50 +# run 2: 11.920: TARGET_COUNT=155 +# run 3: 9.182: TARGET_COUNT=130 +# run 4: 10.185: TARGET_COUNT=141 +# run 5: 9.945: TARGET_COUNT=138 +# run 6: 10.035: TARGET_COUNT=138 +# run 7: 9.898: TARGET_COUNT=137 +# run 8: 9.840: TARGET_COUNT=137 +# run 9: 10.054: TARGET_COUNT=137 +# run 10: 9.747: TARGET_COUNT=136 +# run 11: 9.778: TARGET_COUNT=136 +# run 12: 9.743: TARGET_COUNT=136 +# +# The fact that this varies so much suggests that it's pretty +# non-deterministic, which makes sense for a test involving -j. + +test = TestSCons.TimeSCons(variables={'TARGET_COUNT':136}) test.main() |