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https://issues.apache.org/jira/browse/LUCENE-7778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15972823#comment-15972823
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Adrien Grand commented on LUCENE-7778:
--------------------------------------
The fact that {{MMapDirectory}} performs worse than {{RAMDirectory}} is a bit
counter-intuitive to me, what does your workload look like? Your last comment
suggests that you run queries on tiny indexes that contain 10 to 200 documents,
is it correct? This looks like a use-case that {{MemoryIndex}} has been
designed for?
> 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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