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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12550165
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Yonik Seeley commented on LUCENE-753:
-------------------------------------
Weird... I'm still getting slower results from pread on WinXP.
Can someone else verify on a windows box?
{code}
[EMAIL PROTECTED] ~
$ c:/opt/jdk16/bin/java -server FileReadTest testfile ClassicFile false 1 200
config: impl=ClassicFile serial=false nThreads=1 iterations=200 bufsize=1024
filelen=9616000
answer=160759732, ms=14984, MB/sec=128.35024025627337
$ c:/opt/jdk16/bin/java -server FileReadTest testfile ClassicFile false 1 200
config: impl=ClassicFile serial=false nThreads=1 iterations=200 bufsize=1024
filelen=9616000
answer=160759732, ms=14640, MB/sec=131.36612021857923
$ c:/opt/jdk16/bin/java -server FileReadTest testfile ChannelPread false 1 200
config: impl=ChannelPread serial=false nThreads=1 iterations=200 bufsize=1024
filelen=9616000
answer=160759732, ms=21766, MB/sec=88.35798952494717
$ c:/opt/jdk16/bin/java -server FileReadTest testfile ChannelPread false 1 200
config: impl=ChannelPread serial=false nThreads=1 iterations=200 bufsize=1024
filelen=9616000
answer=160759732, ms=21718, MB/sec=88.55327378211622
$ c:/opt/jdk16/bin/java -version
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b06)
Java HotSpot(TM) Client VM (build 1.6.0_02-b06, mixed mode)
{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, 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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