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From "T Jake Luciani (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-5884) Improve offheap memory performance
Date Tue, 13 Aug 2013 16:09:47 GMT
T Jake Luciani created CASSANDRA-5884:
-----------------------------------------

             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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