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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2014/04/14 12:06:15 UTC

[jira] [Created] (CASSANDRA-7030) Remove JEMallocAllocator

Benedict created CASSANDRA-7030:
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             Summary: Remove JEMallocAllocator
                 Key: CASSANDRA-7030
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7030
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Benedict
            Assignee: Benedict
            Priority: Minor
             Fix For: 2.1 beta2


JEMalloc, whilst having some nice performance properties by comparison to Doug Lea's standard malloc algorithm in principle, is pointless in practice because of the JNA cost. In general it is around 30x more expensive to call than unsafe.allocate(); malloc does not have a variability of response time as extreme as the JNA overhead, so using JEMalloc in Cassandra is never a sensible idea. I doubt if custom JNI would make it worthwhile either.

I propose removing it.



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