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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625679#action_12625679
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Michael McCandless commented on LUCENE-753:
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{quote}
FS: 33644ms
MMap: 28616ms
NIOFS: 33189ms
I'm a bit surprised at the results myself, but I've spent a bit of time tuning
the indexes to maximize concurrency. I'll double-check that the benchmark is
correctly running all of the tests.
{quote}
This is surprising -- your benchmark is very concurrent, yet FSDir and NIOFSDir
are close to the same net throughput, while MMapDir is quite a bit faster. Is
this on a non-Windows OS?
> 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
> Assignee: Michael McCandless
> Fix For: 2.4
>
> Attachments: FileReadTest.java, FileReadTest.java, FileReadTest.java,
> FileReadTest.java, FileReadTest.java, FileReadTest.java, FileReadTest.java,
> FSDirectoryPool.patch, FSIndexInput.patch, FSIndexInput.patch,
> LUCENE-753.patch, LUCENE-753.patch, LUCENE-753.patch, lucene-753.patch,
> lucene-753.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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