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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12550078
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Yonik Seeley commented on LUCENE-753:
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Brad, one possible difference is the number of threads we tested with.
I tested single-threaded (nThreads=1) to see what kind of slowdown a single
query might see.
A normal production system shouldn't see 200 concurrent running search threads
unless it's just about to fall over, or unless it's one of those massive
multi-core systems. After you pass a certain amount of parallelism, NIO can
help.
> 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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