Remove unnecessary memory barriers in DWPT
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Key: LUCENE-3408
URL: https://issues.apache.org/jira/browse/LUCENE-3408
Project: Lucene - Java
Issue Type: Improvement
Components: core/index
Affects Versions: 4.0
Reporter: Simon Willnauer
Priority: Minor
Fix For: 4.0
Currently DWPT still uses AtomicLong to count the bytesUsed. Each write access
issues an implicite memory barrier which is totally unnecessary since we doing
everything single threaded on that level. This might be very minor but we
shouldn't issue unnecessary memory barriers causing processors to lock their
instruction pipeline for no reason.
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