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perfomance issue in v3.3.2 related to MIMALLOC_ARENA_EAGER_COMMIT #1323

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perfomance issue in v3.3.2 related to MIMALLOC_ARENA_EAGER_COMMIT#1323

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@adamse
adamse
opened on Jun 29, 2026

Reported by two jj users at jj-vcs/jj#9708:

Runtime goes to several seconds for trivial usage, one user reports perf profile showing excessive time in mi_page_free_list_extend. Both users report that MIMALLOC_ARENA_EAGER_COMMIT=0 mitigates the issue.

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