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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12609435#action_12609435
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Yonik Seeley commented on LUCENE-753:
-------------------------------------
Here are some of my results with 4 threads and a pool size of 4 fds per file.
Win XP on a Pentium4 w/ Java5_0_11 -server
{code}
config: impl=PooledPread serial=false nThreads=4 iterations=100 bufsize=1024
poolsize=4 filelen=9616000
answer=322211190, ms=51891, MB/sec=74.12460735002217
config: impl=ChannelPread serial=false nThreads=4 iterations=100 bufsize=1024
poolsize=4 filelen=9616000
answer=322211190, ms=71175, MB/sec=54.04144713733755
config: impl=ClassicFile serial=false nThreads=4 iterations=100 bufsize=1024
poolsize=4 filelen=9616000
answer=322211190, ms=62699, MB/sec=61.34707092617107
config: impl=SeparateFile serial=false nThreads=4 iterations=100 bufsize=1024
poolsize=4 filelen=9616000
answer=322211410, ms=21324, MB/sec=180.37891577565185
{code}
> 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, FileReadTest.java,
> FileReadTest.java, FileReadTest.java, FileReadTest.java, FileReadTest.java,
> FSIndexInput.patch, FSIndexInput.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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