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Revision e4d452b4


Added by Michael Hanselmann almost 12 years ago

Add lock performance utility

I had an idea for improving locking performance. To see if it worked I
wrote this tool. Unfortunately the idea didn't quite work (broke
unittests left and right), but the tool is still handy for evaluating
future changes to the “SharedLock” class.

It is not installed or run at build/test time. In its current form it is
intended for manual use. Example output:

Total number of acquisitions: 32642
Per-thread acquisitions:
Thread 0: 6536 (20.0%)
Thread 1: 6488 (19.9%)
Thread 2: 6536 (20.0%)
Thread 3: 6529 (20.0%)
Thread 4: 6553 (20.1%)
Benchmark CPU time: 5.010s
Average time per lock acquisition: 0.15348ms
User time: 4.160s
System time: 1.030s
Total time: 5.190s

Signed-off-by: Michael Hanselmann <>
Reviewed-by: Iustin Pop <>


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