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https://issues.apache.org/jira/browse/ARTEMIS-2321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16838572#comment-16838572
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ASF subversion and git services commented on ARTEMIS-2321:
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Commit 30c82f43b0f3d602bba5bc0a962de590a4afde63 in activemq-artemis's branch
refs/heads/master from Francesco Nigro
[ https://gitbox.apache.org/repos/asf?p=activemq-artemis.git;h=30c82f4 ]
ARTEMIS-2321 PageCursorInfo caches number of msgs to save Page::read
> Paging scalability and GC improvements
> --------------------------------------
>
> Key: ARTEMIS-2321
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2321
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 2.8.0
> Reporter: Francesco Nigro
> Priority: Major
> Fix For: 2.9.0
>
> Time Spent: 11h 40m
> Remaining Estimate: 0h
>
> PageCursorProviderImpl::getPageCache's on cache miss is blocking the whole
> softCache until the requested page isn't fully read, making other threads
> unable to make progress by querying the cache.
> It would be better to make the page read operation a non-blocking operation
> for the whole cache, allowing threads that need different pageId to make
> progress.
> Other improvements:
> * PageCursorProviderImpl can use specialized primitive hash maps to reduce
> memory footprint (that would cause some page entries to be collected
> prematurely)
> * PageCache children can avoid to maintain a reference to a Page
> * PagingStoreImpl perform many unnecessary volatile stores/loads and some
> fields can be turned into plain ones, avoiding expensive atomic operations
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