JohannesLichtenberger commented on pull request #518:
URL: https://github.com/apache/lucene/pull/518#issuecomment-1084809944
Thanks for your great explanation. Makes a lot of sense.
Do you know if the `MAP_SHARED` flag is set for mapped memory segments? I
guess this means that even if I'm opening a few mapped memory segments on the
same file (even if they might only have overlapping regions and the segments
will grow in size as the file grows) the virtual address space and the loaded
pages will be shared when opened in the same `FileChannel.MapMode`
(`READ_ONLY`) mode for instance. I also think setting `madivse` for random
index accesses in my case would be of advantage, as the main trie index access
pattern might be random.
```
MAP_SHARED
Share this mapping. Updates to the mapping are visible to
other
processes mapping the same region, and (in the case of
file-
backed mappings) are carried through to the underlying
file.
(To precisely control when updates are carried through to
the
underlying file requires the use of msync(2).)
```
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