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Vijay commented on CASSANDRA-7030:
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JEMalloc will be better if you have different sized objects (if of same size
then there isn't much fragmentation), the benchmark in the other ticket uses
"50000 2000000" which will provide you a distribution which can be compared...
I don't think the test you are proposing is valid...
Anyways i don't really have any bias on this ticket as we don't use this in
production and thinking on JNI alternatives for Serialized cache anyways...
> 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
> Labels: performance
> Fix For: 2.1 beta2
>
> Attachments: 7030.txt
>
>
> 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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