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Re: 5:10: Why is this slower than 5.8.8?

by schwern (Scribe)
on Dec 26, 2007 at 04:48 UTC ( #658998=note: print w/replies, xml ) Need Help??

in reply to 5:10: Why is this slower than 5.8.8?

This thread on p5p explains the problem. In short...

For some reason the optimiser has decided that there are common elements
on both sides, and that therefore a temporary copy of each element must be
made. This is to handle cases like:

    ($a,$b) = ($b,$a);

but is now slowing down the normal case.

It was tracked back to this patch. Now that it's been nailed down there's a very good chance it'll be fixed in 5.10.1.

  • Comment on Re: 5:10: Why is this slower than 5.8.8?

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Re^2: 5:10: Why is this slower than 5.8.8?
by Corion (Patriarch) on Jan 07, 2008 at 15:39 UTC

    The resolution came not appended to the above thread but in a reply to the p5p summaries generously written by grinder and made possible through

    Big slowdown fix patch, provided by Rick Delaney.

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