[jira] [Commented] (ARTEMIS-2239) Zero-copy NIO/MAPPED TimedBuffer

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARTEMIS-2239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16767732#comment-16767732 ] 

ASF subversion and git services commented on ARTEMIS-2239:
----------------------------------------------------------

Commit 4da9d8431166fa568db2763c850930c9dff7edf0 in activemq-artemis's branch refs/heads/master from Francesco Nigro
[ https://gitbox.apache.org/repos/asf?p=activemq-artemis.git;h=4da9d84 ]

ARTEMIS-2239 Zero-copy NIO/MAPPED TimedBuffer

NIO/MAPPED journal types can use directly the buffer of TimedBuffer
to perform file writes, avoiding an expensive copy + zeroing.


> Zero-copy NIO/MAPPED TimedBuffer
> --------------------------------
>
>                 Key: ARTEMIS-2239
>                 URL: https://issues.apache.org/jira/browse/ARTEMIS-2239
>             Project: ActiveMQ Artemis
>          Issue Type: Improvement
>          Components: Broker
>    Affects Versions: 2.6.4
>            Reporter: Francesco Nigro
>            Assignee: Francesco Nigro
>            Priority: Major
>          Time Spent: 5h 40m
>  Remaining Estimate: 0h
>
> NIO/MAPPED journal types are currently performing the copy of the buffer used on TimedBuffer to accumulate writes, but this copy (and the zeroing of the new buffer) could be avoided, reducing dramatically the CPU usage and latencies during a burst of writes.
> An added benefit of this change is that isn't necessary anymore to stress the thread pool of the file factory, because there is no need to pool the buffer used to perform the write.



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