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https://issues.apache.org/jira/browse/LUCENE-7778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16013958#comment-16013958
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ASF GitHub Bot commented on LUCENE-7778:
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Github user spmason closed the pull request at:
https://github.com/apache/lucene-solr/pull/183
> Remove synchronized from high-contention methods on RAMFile
> -----------------------------------------------------------
>
> Key: LUCENE-7778
> URL: https://issues.apache.org/jira/browse/LUCENE-7778
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/store
> Reporter: Steve Mason
> Priority: Minor
>
> When benchmarking RAMDirectory access via multiple threads the methods
> {{RAMFile::numBuffers}} and {{RAMFile::getBuffer}} show up blocking threads
> fairly frequently
> By removing the {{synchronized}} keyword from these methods our internal
> benchmarks show a 2x performance increase under concurrent load.
> I don't think removing {{synchronized}} from these methods is a problem as
> they are read-only and write access to these fields is not synchronized.
> LUCENE-2779 also implies that some ofthe locking on RAMDirectory is not
> necessary
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