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Perl: the Markov chain saw

Re^5: Generate a unique ID

by Your Mother (Chancellor)
on Nov 17, 2010 at 15:32 UTC ( #872005=note: print w/replies, xml ) Need Help??

in reply to Re^4: Generate a unique ID
in thread Generate a unique ID

I'm curious about the why/which in this. I just ran you test code several times and even put it to 1e9 and 1e8 which both ran out of memory before completing and I got no "Repeat" deaths. This is on a modern Linux box with Perl 5.8. What hardware/perl combination makes yours bomb out so early?

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Re^6: Generate a unique ID
by BrowserUk (Pope) on Nov 17, 2010 at 15:37 UTC

    I did mention the reason. MS' CRT rand() function uses 15-bits only.

    This also affects Perl directly because the perl's rand is implemented in terms of the crt function.

    I'd normally use Math::Random::MT for anything where I need a descent random, but the standard implementation (and therefore the Perl module) is not threadsafe due to some static internal buffers.

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