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apregier avatar apregier commented on September 24, 2024

Another possible approach - similar to unix sort, you could write out temp sorted partitions.

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ernfrid avatar ernfrid commented on September 24, 2024

This addressed by #17 which implements an external merge sort.

Memory usage for a 1000 person, 800,000 line cohort is now ~6GB and merging completes in ~30 minutes of wall clock. In testing on a 5000 person cohort, ~5000 lines per file, merging completes in ~3:40h with ~5G of RAM.

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