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Wilfred Hughes

Jun 13, 2022 at 11:27

Encountered a type of bug I've never seen before: upgrading the malloc implementation had a catastrophic effect on performance! I suspect one of my libraries is allocating large arrays and not writing to them. https://github.com/Wilfred/difftastic/commit/ae42762a6d94e702e0e81e5181f11f33fca6c0eb

Fix mimalloc perf regression in 57a4b6d6ce9fb · Wilfred/difftastic@ae42762

Fix mimalloc perf regression in 57a4b6d6ce9fb · Wilfred/difftastic@ae42762

It looks like we were allocating large buffers for wu-diff, and mimalloc performance is much worse for this case in the new version. This reverts performance back to that 0.28 for large files, suc...