Comment #7 on issue 4406 by [email protected]: profiler has huge impact on
performance for some code (mac)
https://code.google.com/p/v8/issues/detail?id=4406
Ok, it seems to be a problem with OS X SIGPROF signal handlers. At least it
is still slow if I make signal handler empty, by placing return right in
the beginning of it here
https://code.google.com/p/chromium/codesearch#chromium/src/v8/src/sampler.cc&q=ProfilerSign&sq=package:chromium&l=339
So the handler basically does nothing, but it slows down execution.
However if I disable the signal initiation, it runs fast, i.e. when I
comment out pthread_kill call here:
https://code.google.com/p/chromium/codesearch#chromium/src/v8/src/sampler.cc&q=pthread_kill%20f:v8&sq=package:chromium&type=cs&l=732
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