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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12550168
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robert engels commented on LUCENE-753:
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I sent this via email, but probably need to add to the thread...
I posted a bug on this to Sun a long while back. This is a KNOWN BUG on
Windows.
NIO preads actually sync behind the scenes on some platforms. Using multiple
file descriptors is much faster.
See bug http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6265734
> 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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