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https://issues.apache.org/jira/browse/SYSTEMML-2069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-2069.
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Resolution: Fixed
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.1
> Thread contention on heavy hitter maintenance
> ---------------------------------------------
>
> Key: SYSTEMML-2069
> URL: https://issues.apache.org/jira/browse/SYSTEMML-2069
> Project: SystemML
> Issue Type: Bug
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Priority: Major
> Fix For: SystemML 1.1
>
>
> In multi-threaded applications with many small operations, the synchronized
> maintenance of heavy hitters can turn into a bottleneck. Example scenarios
> are JMLC scoring with multiple JMLC streams per node and local parfor scripts.
> All statistics other than the heavy hitters are already using {{LongAdder}}s
> to scale under heavy contention. This task aims to make the heavy hitter
> contention lock-free, i.e., remove the unnecessary contention.
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