Beyond those guesses, I'd need to see the profiler output.

Ok, I've found the issue. As with these things, a very unexpected source..

pthread_mutex_lock

We use pthreads as our threading library and for some reason, the version of pthreads that comes with strawberry is massively slower than what we are currently using. Remove all the lock/unlocks, and the 64bit 5.24.0 is faster than 32bit 5.8.9.

Now to figure out why this version of the library is so slow...

In reply to Re^4: Our perl/xs/c app is 30% slower with 64bit 5.24.0, than with 32bit 5.8.9. Why? by Anonymous Monk
in thread Our perl/xs/c app is 30% slower with 64bit 5.24.0, than with 32bit 5.8.9. Why? by Anonymous Monk

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