jpountz commented on PR #13337:
URL: https://github.com/apache/lucene/pull/13337#issuecomment-2096902937
> Can't we use the same filechannel and do a positional read in another
thread (not async)?
I gave it a try in the last commit, is this what you had in mind? The
benchmark suggests that this still works well, slightly better than the
previous approach, now on-par with `MMapDirectory`.
```
Data does not fit in the page cache
With prefetching: P50=88us P90=124us
Without prefetching: P50=223us P90=243us
Data fits in the page cache
With prefetching: P50=1us P90=2us
Without prefetching: P50=0us P90=0us
```
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