Steve Mason created LUCENE-7778:
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Summary: 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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