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As a follow-up, I mostly left the script alone, since the wife is in the final weeks of a really big analytic paper and I can't risk slowing her down with my debugging. But I did double the memory on the machine (to 12GB), and saw the clock-time cost of the Fisher-Yates shuffle drop from the ~hour mentioned above to about 45 seconds to do all 43-million iterations. So I think we can safely say it was a swapping issue... Thanks for all the kind suggestions and analysis! In reply to Re^4: Very Large Arrays
by Desade
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