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https://issues.apache.org/jira/browse/LUCENE-2056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12878921#action_12878921
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Michael McCandless commented on LUCENE-2056:
--------------------------------------------
It's remotely possible that using direct byte buffers (in the above patch)
works around the nasty Sun JVM bug
(http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6265734) that makes
NIOFSDirectory useless on windows...
Can someone w/ access to a multi-CPU/core Windows box test this?
You just need an existing index, and then something like this alg (searches w/
4 threads) EXCEPT you have to temporarily edit FSDirectory.java to return this
DirectNIOFSDirectory on Windows:
{noformat}
analyzer=org.apache.lucene.analysis.core.WhitespaceAnalyzer
directory=FSDirectory
work.dir = /x/lucene/trunkwiki
log.step=100000
search.num.hits=10
query.maker=org.apache.lucene.benchmark.byTask.feeds.FileBasedQueryMaker
file.query.maker.file = queries.txt
# task at this depth or less would print when they start
task.max.depth.log=2
log.queries=true
#
-------------------------------------------------------------------------------------
{ "Rounds"
OpenReader
[ { "topDocs" Search > : 6.0s }: 4
CloseReader
RepSumByPref topDocs
NewRound
} : 10
{noformat}
> Should NIOFSDir use direct ByteBuffers?
> ---------------------------------------
>
> Key: LUCENE-2056
> URL: https://issues.apache.org/jira/browse/LUCENE-2056
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Store
> Reporter: Michael McCandless
> Priority: Minor
> Attachments: LUCENE-2056.patch
>
>
> I'm trying to test NRT performance, and noticed when I dump the thread stacks
> that the darned threads often seem to be in
> {{java.nio.Bits.copyToByteArray(Native Method)}}... so I wondered whether we
> could/should use direct ByteBuffers, and whether that would gain performance
> in general. We currently just use our own byte[] buffer via
> BufferedIndexInput.
> It's hard to test since it's likely platform specific, but if it does result
> in gains it could be an easy win.
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