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https://issues.apache.org/jira/browse/CASSANDRA-8714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14346508#comment-14346508
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Robert Stupp commented on CASSANDRA-8714:
-----------------------------------------
Hm - the micro bench itself tells that neither approach has any benefit.
The microbench uses direct and heap BBs. _branch_ means the patch and _trunk_ -
yea trunk.
{noformat:title=64kB}
[java] Benchmark Mode
Samples Score Error Units
[java] o.a.c.t.m.SetBytesAllocationBench.branch thrpt
10 0,957 ± 0,036 ops/us
[java] o.a.c.t.m.SetBytesAllocationBench.branch:branchDirect thrpt
10 0,483 ± 0,013 ops/us
[java] o.a.c.t.m.SetBytesAllocationBench.branch:branchHeap thrpt
10 0,474 ± 0,025 ops/us
[java] o.a.c.t.m.SetBytesAllocationBench.trunk thrpt
10 0,938 ± 0,053 ops/us
[java] o.a.c.t.m.SetBytesAllocationBench.trunk:trunkDirect thrpt
10 0,473 ± 0,024 ops/us
[java] o.a.c.t.m.SetBytesAllocationBench.trunk:trunkHeap thrpt
10 0,466 ± 0,030 ops/us
{noformat}
{noformat:title=1kB}
[java] Benchmark Mode
Samples Score Error Units
[java] o.a.c.t.m.SetBytesAllocationBench.branch thrpt
10 58,268 ± 2,936 ops/us
[java] o.a.c.t.m.SetBytesAllocationBench.branch:branchDirect thrpt
10 30,058 ± 1,649 ops/us
[java] o.a.c.t.m.SetBytesAllocationBench.branch:branchHeap thrpt
10 28,209 ± 1,525 ops/us
[java] o.a.c.t.m.SetBytesAllocationBench.trunk thrpt
10 55,066 ± 2,410 ops/us
[java] o.a.c.t.m.SetBytesAllocationBench.trunk:trunkDirect thrpt
10 28,169 ± 1,449 ops/us
[java] o.a.c.t.m.SetBytesAllocationBench.trunk:trunkHeap thrpt
10 26,897 ± 1,206 ops/us
{noformat}
> row-cache: use preloaded jemalloc w/ Unsafe
> -------------------------------------------
>
> Key: CASSANDRA-8714
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8714
> Project: Cassandra
> Issue Type: Sub-task
> Reporter: Robert Stupp
> Assignee: Robert Stupp
> Fix For: 3.0
>
> Attachments: 8714-2.txt, 8714-3.txt, 8714-4.txt, 8714.txt
>
>
> Using jemalloc via Java's {{Unsafe}} is a better alternative on Linux than
> using jemalloc via JNA.
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