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https://issues.apache.org/jira/browse/ARTEMIS-2224?focusedWorklogId=185206&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-185206
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ASF GitHub Bot logged work on ARTEMIS-2224:
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Author: ASF GitHub Bot
Created on: 15/Jan/19 10:15
Start Date: 15/Jan/19 10:15
Worklog Time Spent: 10m
Work Description: franz1981 commented on issue #2494: ARTEMIS-2224 Reduce
contention on LivePageCacheImpl
URL: https://github.com/apache/activemq-artemis/pull/2494#issuecomment-454338688
> @franz1981 thx for recommending this tool, much easier to use than jfr!
I was sure you would have like it: is indeed "pragmatically better" for devs
IMHO: just remember to enable debug non safepoints, but with JFR is the same,
reading their docs!
@qihongxu
> At the end of test the perf boosted to 30k tps
The current implementation (lock-free) of the live page cache suffer of the
same performance limitation of a `LinkedList`: queries at the beginning and at
the end of the list are faster ie `O(1)`, while in the middle are slower ie
`O(n)`.
To make things faster we need to exploit a better access pattern and provide
a cursor-like implementation on it to be used on `QueueImpl::depage`: it should
improve things at the point of having ~`O(1)` `getMessage` cost if the cursor
will be used with a sequential access pattern, like an iterator.
If you like the idea and it really seems to be important I can provide an
implementaion for it ie 900M of page size and very small messages are not such
a common use case TBH
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Issue Time Tracking
-------------------
Worklog Id: (was: 185206)
Time Spent: 1h 20m (was: 1h 10m)
> Reduce contention on LivePageCacheImpl
> --------------------------------------
>
> Key: ARTEMIS-2224
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2224
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 2.7.0
> Reporter: Francesco Nigro
> Assignee: Francesco Nigro
> Priority: Major
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> Has been measured that LIvePageCacheImpl operations are a source of
> contention on producer side while paging.
> This contention decrease the scalability of the broker in an evident way
> while using topics, because the page cache is been accessed concurrently by
> several producers to ack transactions while the messages are being appended.
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