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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12550130
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Doug Cutting commented on LUCENE-753:
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> Brad, [...]
That's Brian. And right, the difference in your tests is the number of threads.
Perhaps this is a case where one size will not fit all. MmapDirectory is
fastest on 64-bit platforms with lots of threads, while good-old-FSDirectory
has always been fastest for single-threaded access. Perhaps a PreadDirectory
would be the Directory of choice for multi-threaded access of large indexes on
32-bit hardware? It would be useful to benchmark this patch against
MmapDirectory, since they both remove synchronization.
> Use NIO positional read to avoid synchronization in FSIndexInput
> ----------------------------------------------------------------
>
> Key: LUCENE-753
> URL: https://issues.apache.org/jira/browse/LUCENE-753
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Store
> Reporter: Yonik Seeley
> Attachments: FileReadTest.java, FSIndexInput.patch, FSIndexInput.patch
>
>
> As suggested by Doug, we could use NIO pread to avoid synchronization on the
> underlying file.
> This could mitigate any MT performance drop caused by reducing the number of
> files in the index format.
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