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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12550128
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Brian Pinkerton commented on LUCENE-753:
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Whoops; I should have paid more attention to the args. The results in the
single-threaded case still favor pread, but by a slimmer margin:
Linux:
config: impl=ClassicFile serial=false nThreads=1 iterations=200 bufsize=1024
filelen=10485760
answer=0, ms=9983, MB/sec=210.0723229490133
config: impl=ChannelPread serial=false nThreads=1 iterations=200 bufsize=1024
filelen=10485760
answer=0, ms=9247, MB/sec=226.7926895209257
Solaris 10:
config: impl=ClassicFile serial=false nThreads=1 iterations=200 bufsize=1024
filelen=10485760
answer=0, ms=7381, MB/sec=284.12843788104595
config: impl=ChannelPread serial=false nThreads=1 iterations=200 bufsize=1024
filelen=10485760
answer=0, ms=6245, MB/sec=335.81297037630105
Mac OS X:
config: impl=ChannelPread serial=false nThreads=1 iterations=200 bufsize=1024
filelen=10485760
answer=-914995, ms=19945, MB/sec=105.14675357232389
config: impl=ClassicFile serial=false nThreads=1 iterations=200 bufsize=1024
filelen=10485760
answer=-914995, ms=26378, MB/sec=79.50382894836606
> 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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