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https://issues.apache.org/jira/browse/ARTEMIS-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17163909#comment-17163909
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ASF subversion and git services commented on ARTEMIS-2849:
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Commit 7902dd175745f0bd15b6ea419b201b215e108ceb in activemq-artemis's branch
refs/heads/master from franz1981
[ https://gitbox.apache.org/repos/asf?p=activemq-artemis.git;h=7902dd1 ]
ARTEMIS-2849 Optimize zeroing of buffers while writing the ASYNCIO journal
> Eliminate zeroing of buffers while writing the ASYNCIO journal
> --------------------------------------------------------------
>
> Key: ARTEMIS-2849
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2849
> Project: ActiveMQ Artemis
> Issue Type: Test
> Components: Broker
> Reporter: Francesco Nigro
> Priority: Major
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> By default ASYNCIO using TimedBuffer are zeroing the ByteBuffers used to
> perform the write on the journal: under load TimedBuffer can be big enough
> that zeroing would cost the same as copying the actual content into it, hence
> saving the zeroing is quite beneficial to save CPU time and increase IOPS.
> NIO and MAPPED doesn't need it because they already use directly the
> TimedBuffer's accumulation buffer to perform writes (that's never zeroed,
> because it already contains the content that they expect to write into the
> journal), but changing ASYNCIO need to adjust the same calls on NIO and
> MAPPED for completeness.
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