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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (SYSTEMML-2069) Thread contention on heavy hitter maintenance
Date Tue, 16 Jan 2018 22:34:01 GMT

     [ https://issues.apache.org/jira/browse/SYSTEMML-2069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias Boehm closed SYSTEMML-2069.
------------------------------------
       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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