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From "Jacob S. Barrett (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (GEODE-6424) Reduce overhead of stats storage
Date Mon, 18 Feb 2019 17:21:00 GMT

     [ https://issues.apache.org/jira/browse/GEODE-6424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jacob S. Barrett updated GEODE-6424:
------------------------------------
    Attachment: 32-thread.png

> Reduce overhead of stats storage
> --------------------------------
>
>                 Key: GEODE-6424
>                 URL: https://issues.apache.org/jira/browse/GEODE-6424
>             Project: Geode
>          Issue Type: Improvement
>          Components: statistics
>            Reporter: Jacob S. Barrett
>            Priority: Major
>         Attachments: 32-thread.png, image.png
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> The current stats storage system is based on a very old and complicated implementation
of a thread striped counter. See {{Atomic50StatisticsImpl}}. This implementation makes now
incorrect assumptions about certain performance characteristics of volatile memory access.
Combined with it's complexity it is causing large variances in performance numbers on the
function benchmarks. Runs can differ by as much as 45%.
> Replace this implementation with one based on the Java 8 {{LongAdder}}, which is a modern
and JDK maintained implementation of a striped counter. Also use {{DoubleAdder}} to support
doubles, which the {{Atomic50StatisticsImpl}} does not support.



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