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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-2069) Thread contention on heaver hitter maintenance
Date Fri, 12 Jan 2018 02:00:03 GMT
Matthias Boehm created SYSTEMML-2069:
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             Summary: Thread contention on heaver hitter maintenance
                 Key: SYSTEMML-2069
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2069
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


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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