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Posted to dev@lucene.apache.org by "Jason Rutherglen (JIRA)" <ji...@apache.org> on 2008/07/01 22:58:45 UTC
[jira] Updated: (LUCENE-1322) Remove synchronization in
CompoundFileReader
[ https://issues.apache.org/jira/browse/LUCENE-1322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jason Rutherglen updated LUCENE-1322:
-------------------------------------
Attachment: lucene-1322.patch
lucene-1322.patch
CSIndexInput.clone() added that clones the base IndexInput removing the synchronization overhead from CompoundFileReader.
> Remove synchronization in CompoundFileReader
> --------------------------------------------
>
> Key: LUCENE-1322
> URL: https://issues.apache.org/jira/browse/LUCENE-1322
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.3.1
> Reporter: Jason Rutherglen
> Priority: Trivial
> Attachments: lucene-1322.patch
>
>
> Currently there is what seems to be unnecessary synchronization in CompoundFileReader. This is solved by cloning the base IndexInput. Synchronization in low level IO classes creates lock contention on highly multi threaded Lucene installations, so much so that in many cases the CPU utilization never reaches the maximum without using something like ParallelMultiSearcher.
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