in reply to Re^9: PDL and srand puzzle - uniqueness PDL->random vs CORE::rand
in thread PDL and srand puzzle

I'd have expected calling srandom inside new threads to behave better. Could you take a look at the srand code and see if anything is obviously wrong? Also, are you able to see if the duplicates are in groups i.e. sequences?

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Re^11: PDL and srand puzzle - PDL::srand/srandom not working
by marioroy (Prior) on Jun 08, 2024 at 06:40 UTC

    See my reply to Rob. In short, calling PDL::srandom before spawning workers has no effect. The workaround is to call CORE::srand instead.

    See also, non-thread testing.

    Edit: MCE checks for PDL::Primitive->can('srand'), but missed checking PDL::Primitive->can('srandom'). Resolved in MCE v1.894 and MCE::Shared v1.889.

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      Calling srand cannot be a workaround for this, because there is no interaction between Perl's RNG and PDL's. They are separate systems.
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