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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3408) Remove unnecessary memory barriers in DWPT
Date Tue, 30 Aug 2011 20:51:10 GMT
Remove unnecessary memory barriers in DWPT
------------------------------------------

                 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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