1. 22 Dec, 2011 1 commit
    • Michael Hanselmann's avatar
      Add lock performance utility · e4d452b4
      Michael Hanselmann authored
      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: default avatarMichael Hanselmann <hansmi@google.com>
      Reviewed-by: default avatarIustin Pop <iustin@google.com>