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fix large OS page behaviour on Linux; default is now 2 which only uses large OS pages (not huge) through madvise

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Daan Leijen 2025-01-03 20:00:40 -08:00
parent 27687718bc
commit 2451b5685c
4 changed files with 16 additions and 12 deletions
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doc/mimalloc-doc.h
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@ -1231,8 +1231,9 @@ Further options for large workloads and services:
the actual NUMA nodes is fine and will only cause threads to potentially allocate more memory across actual NUMA
nodes (but this can happen in any case as NUMA local allocation is always a best effort but not guaranteed).
- `MIMALLOC_ALLOW_LARGE_OS_PAGES=1`: use large OS pages (2 or 4MiB) when available; for some workloads this can significantly
improve performance. When this option is disabled, it also disables transparent huge pages (THP) for the process
(on Linux and Android). Use `MIMALLOC_VERBOSE` to check if the large OS pages are enabled -- usually one needs
improve performance. When this option is disabled (default), it also disables transparent huge pages (THP) for the process
(on Linux and Android). On Linux the default setting is 2 -- this enables the use of large pages through THP only.
Use `MIMALLOC_VERBOSE` to check if the large OS pages are enabled -- usually one needs
to explicitly give permissions for large OS pages (as on [Windows][windows-huge] and [Linux][linux-huge]). However, sometimes
the OS is very slow to reserve contiguous physical memory for large OS pages so use with care on systems that
can have fragmented memory (for that reason, we generally recommend to use `MIMALLOC_RESERVE_HUGE_OS_PAGES` instead whenever possible).