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Re: Perl Tops "Wide Finder" Results

by erroneousBollock (Curate)
on Nov 22, 2007 at 01:29 UTC ( #652289=note: print w/ replies, xml ) Need Help??


in reply to Perl Tops "Wide Finder" Results

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 wf.pl 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 (wf.pl) 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.

-David


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Re^2: Perl Tops "Wide Finder" Results
by educated_foo (Vicar) on Nov 22, 2007 at 02:57 UTC
    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.

      -David

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