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https://issues.apache.org/jira/browse/LUCENE-3408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13094406#comment-13094406
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Michael McCandless commented on LUCENE-3408:
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Looks good Simon! Have you tested perf...? Likely minor but you never know :)
> 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
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: 4.0
>
> Attachments: LUCENE-3408.patch
>
>
> 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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