T Jake Luciani created CASSANDRA-5884:
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Summary: Improve offheap memory performance
Key: CASSANDRA-5884
URL: https://issues.apache.org/jira/browse/CASSANDRA-5884
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: T Jake Luciani
Assignee: T Jake Luciani
Fix For: 2.0.1
Attachments: memperf.txt
Currently we getting data to and from offheap is slow due to individual calls
to getByte() and putByte()
The following patch makes this a single call and is 10x faster
{code}
benchmark:
[java] 0% Scenario{vm=java, trial=0, benchmark=GetBytesOld} 82266.48 ns;
σ=2532.87 ns @ 10 trials
[java] 50% Scenario{vm=java, trial=0, benchmark=GetBytesNew} 7876.95 ns;
σ=489.78 ns @ 10 trials
[java]
[java] benchmark us linear runtime
[java] GetBytesOld 82.27 ==============================
[java] GetBytesNew 7.88 ==
[java]
[java] vm: java
[java] trial: 0
{code}
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