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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549869
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Brian Pinkerton commented on LUCENE-753:
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Most of my workloads would benefit by removing the synchronization in
FSIndexInput, so I took a closer look at this issue. I found exactly the
opposite results that Yonik did on two platforms that I use frequently in
production (Solaris and Linux), and by a significant margin. I even get the
same behavior on the Mac, though I'm not running Java6 there.
# uname -a
Linux xxx 2.6.9-22.0.1.ELsmp #1 SMP Tue Oct 18 18:39:27 EDT 2005 i686 i686 i386
GNU/Linux
# java -version
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b05)
Java HotSpot(TM) Client VM (build 1.6.0_02-b05, mixed mode, sharing)
config: impl=ChannelPread serial=false nThreads=200 iterations=10 bufsize=1024
filelen=10485760
answer=0, ms=88543, MB/sec=236.85124741650947
config: impl=ClassicFile serial=false nThreads=200 iterations=10 bufsize=1024
filelen=10485760
answer=0, ms=150560, MB/sec=139.29011689691816
# uname -a
SunOS xxx 5.10 Generic_118844-26 i86pc i386 i86pc
# java -version
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Server VM (build 1.6.0-b105, mixed mode)
config: impl=ChannelPread serial=false nThreads=200 iterations=10 bufsize=1024
filelen=10485760
answer=0, ms=39621, MB/sec=529.3031473208652
config: impl=ClassicFile serial=false nThreads=200 iterations=10 bufsize=1024
filelen=10485760
answer=0, ms=119057, MB/sec=176.14688762525515
> 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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