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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12550677
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Michael McCandless commented on LUCENE-753:
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I also just ran a test with 4 threads, random access, on Linux 2.6.22.1:
config: impl=ClassicFile serial=false nThreads=4 iterations=200
bufsize=6518936 filelen=67108864
answer=-195110, ms=120856, MB/sec=444.22363142913883
config: impl=ChannelFile serial=false nThreads=4 iterations=200
bufsize=6518936 filelen=67108864
answer=-195110, ms=88272, MB/sec=608.2006887801341
config: impl=ChannelPread serial=false nThreads=4 iterations=200
bufsize=6518936 filelen=67108864
answer=-195110, ms=77672, MB/sec=691.2026367288084
config: impl=ChannelTransfer serial=false nThreads=4 iterations=200
bufsize=6518936 filelen=67108864
answer=594875, ms=38390, MB/sec=1398.465517061735
ChannelTransfer got even faster (scales up with added threads better).
> 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, 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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