jpountz commented on PR #13337:
URL: https://github.com/apache/lucene/pull/13337#issuecomment-2095430556
@rmuir asked if we could add support for this on `MMapDirectory` via
`madvise` + `POSIX_MADV_WILLNEED`. I pushed a new commit that does this (with
several nocommits). This seems to perform well in the above benchmark if I
replace `NIOFSDirectory` with `MMapDirectory`:
```
Data does not fit in the page cache
With prefetching: P50=87us P90=121us
Without prefetching: P50=220us P90=239us
Data fits in the page cache
With prefetching: P50=1us P90=2us
Without prefetching: P50=0us P90=0us
```
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