jpountz opened a new pull request, #13223: URL: https://github.com/apache/lucene/pull/13223
This is a follow-up of a discussion on #13219. `mmap` has a higher readahead than regular `read()` operations by default, e.g. 128kB instead of 16kB on my Linux box. On indexes that exceed the size of the page cache, this may trigger performance issues due to page cache trashing and additional page cache contention. Rather than forcing `MMapDirectory` to use `MADV_RANDOM` on all files, it would make more sense to configure a lower `mmap` readahead at the system level, e.g. the same readahead value as `read()` operations use. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org
