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gh-113141: Tune MI_SEGMENT_SLICE_SHIFT to 14 for using 16 Kib pages #160360

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gh-113141: Tune MI_SEGMENT_SLICE_SHIFT to 14 for using 16 Kib pages #160360

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gh-113141: Tune MI_SEGMENT_SLICE_SHIFT to 14 for using 16 Kib pages
corona10 Oct 22, 2026
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corona10 Oct 23, 2026
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corona10 Oct 23, 2026
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5 changes: 5 additions & 0 deletions Include/internal/pycore_mimalloc.h
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Expand Up @@ -32,6 +32,11 @@ typedef enum {
# define MI_NO_THP 1
// Do not use guarded allocations. The free-threaded GC does not support their block layout.
# define MI_GUARDED 0
// Use 16 KiB pages instead of the default 64 KiB in 64-bit platforms.
// TODO: 32-bit platforms may need tuning too.

@corona10 corona10 Oct 23, 2026

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We may need to tune a 32-bit system, but I prefer to pass at this time.

# if SIZEOF_VOID_P == 8
# define MI_SEGMENT_SLICE_SHIFT 14
# endif
#ifdef Py_DEBUG
# define MI_DEBUG 2
#else
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