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https://issues.apache.org/jira/browse/ARTEMIS-2239?focusedWorklogId=190357&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-190357
]
ASF GitHub Bot logged work on ARTEMIS-2239:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 26/Jan/19 08:45
Start Date: 26/Jan/19 08:45
Worklog Time Spent: 10m
Work Description: franz1981 commented on pull request #2522: ARTEMIS-2239
Zero-copy NIO/MAPPED TimedBuffer
URL: https://github.com/apache/activemq-artemis/pull/2522#discussion_r251192884
##########
File path:
artemis-journal/src/main/java/org/apache/activemq/artemis/core/io/nio/NIOSequentialFile.java
##########
@@ -51,6 +55,34 @@ public NIOSequentialFile(final SequentialFileFactory
factory,
this.maxIO = maxIO;
}
+ @Override
+ protected TimedBufferObserver createTimedBufferObserver() {
+ return new LocalBufferObserver() {
Review comment:
I can do it, but (for this specific class) I can't see the benefits.
In a future implementation I would like to abstract away things like
`AbstractSequentialFile::fileSize` and create 2 separate classes:
`AsyncLocalBufferObserver` and `SyncLocalBufferObserver`.
The former that perform the copy because it assymes asynchrounous writes,
the latter not.
But at this point, given that the classes are packed into their owner seq
file class probably I could just let them be where/as they are to reduce the
code changes.
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Issue Time Tracking
-------------------
Worklog Id: (was: 190357)
Time Spent: 4h 10m (was: 4h)
> 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: 4h 10m
> 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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