[jira] [Created] (CASSANDRA-7621) Use jvm server machine code compiler

["Blake Eggleston (JIRA)" <ji...@apache.org>]

Blake Eggleston created CASSANDRA-7621:
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             Summary: Use jvm server machine code compiler
                 Key: CASSANDRA-7621
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7621
             Project: Cassandra
          Issue Type: Improvement
          Components: Config
            Reporter: Blake Eggleston
            Priority: Minor
             Fix For: 2.0.10
         Attachments: 0001-adding-server-compiler-switch.patch

As far as I can tell, Cassandra is using the jvm's default client compiler. The attached patch adds a line to cassandra-env.sh to tell it to use the jvm's server compiler. The server compiler is meant for long running processes and is more aggressive in it's optimizations to the machine code it generates, at the expense of machine code size and initial compilation speed.

I've run {{cassandra-stress  --num-keys=2000000 -K 50}} and {{cassandra-stress  --num-keys=2000000 -K 50 --operation=READ}} with both settings, and the runs with the server flag are 2-5% faster on average on my Macbook Pro, with a 2.3GHz i7, 16GB of memory and an SSD.

http://www.oracle.com/technetwork/java/whitepaper-135217.html#2



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