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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
on Dec 23, 2016 at 16:05 UTC ( [id://1178436]=note: print w/replies, xml ) Need Help??


in reply to Re^3: Our perl/xs/c app is 30% slower with 64bit 5.24.0, than with 32bit 5.8.9. Why?
in thread Our perl/xs/c app is 30% slower with 64bit 5.24.0, than with 32bit 5.8.9. Why?

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...

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Re^5: Our perl/xs/c app is 30% slower with 64bit 5.24.0, than with 32bit 5.8.9. Why?
by BrowserUk (Patriarch) on Dec 23, 2016 at 16:29 UTC
    Ok, I've found the issue. As with these things, a very unexpected source..

    Cool. Thanks for getting back to us.

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

    Good luck.

    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority". The enemy of (IT) success is complexity.
    In the absence of evidence, opinion is indistinguishable from prejudice.
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