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add option to reserve huge os pages at a specific numa node.

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paulip1792 2021-08-10 16:30:44 +08:00
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@ -302,6 +302,8 @@ or via environment variables:
`MIMALLOC_EAGER_COMMIT_DELAY=N` (`N` is 1 by default) to delay the initial `N` segments (of 4MiB)
of a thread to not allocate in the huge OS pages; this prevents threads that are short lived
and allocate just a little to take up space in the huge OS page area (which cannot be reset).
- `MIMALLOC_RESERVE_HUGE_OS_PAGES_AT=N`: where N is the numa node. This reserves the huge pages at a specific numa node.
(`N` is -1 by default to reserve huge pages evenly among the given number of numa nodes (or use the available ones as detected))
Use caution when using `fork` in combination with either large or huge OS pages: on a fork, the OS uses copy-on-write
for all pages in the original process including the huge OS pages. When any memory is now written in that area, the