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Perl Tops "Wide Finder" Results

by perlfan (Priest)
on Nov 21, 2007 at 20:36 UTC ( #652236=perlnews: print w/replies, xml ) Need Help??

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Re: Perl Tops "Wide Finder" Results
by erroneousBollock (Curate) on Nov 22, 2007 at 01:29 UTC
    For now ;)

    Unfortunately, we should prepare ourselves for the next JoCaml submission to knock at least another 25% off the wf(32) elapsed time :(.

    From what I've read elsewhere, O'Rourke's could be made faster simply by switching from Sys::MMap to MMap. (
    Does the :mmap PerlIO layer introduce significant overhead, as compared to Sys::MMap::mmap()? It'd be nice if you could basically get speedups for free on systems that support mmap.

    What I like about the currently leading Perl solution ( is that it's still a straightforward implementation of an obvious approach to the problem... not too much optimisation necessary to make it run fast.


      AFAICT Sys::MMap and MMap are the same module -- Scott Walters just took it over and updated it for recent perls.
        Ah, you're right. I went looking for where I'd read it...

        The difference is between doing new MMap (slow) and mmap (fast), due to the tie() interface. Don't know if that's still true.


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