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From "Jacob S. Barrett (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GEODE-6424) Reduce overhead of stats storage
Date Sun, 17 Feb 2019 16:17:00 GMT
Jacob S. Barrett created GEODE-6424:
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             Summary: 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


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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