Nearly all of the thread is about other performance stuff, and was only linked here for completeness/interest; the heart of it for this purpose is as stated.

Thank you, the above is very plausible and I have opened an issue on PDL::Parallel::threads quoting your wisdom: https://github.com/run4flat/PDL-Parallel-threads/issues/6.

In reply to Re^2: XS module in ithreads Perl much slower in threads::join after adding SvOBJECT_off by etj
in thread XS module in ithreads Perl much slower in threads::join after adding SvOBJECT_off by etj

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