[jbosscache-issues] [JBoss JIRA] Created: (JBCACHE-1566) Bad performance when bigger objects are used

[tbech (JIRA)]

Bad performance when bigger objects are used
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                 Key: JBCACHE-1566
                 URL: https://jira.jboss.org/jira/browse/JBCACHE-1566
             Project: JBoss Cache
          Issue Type: Bug
      Security Level: Public (Everyone can see)
            Reporter: tbech
            Assignee: Manik Surtani
         Attachments: SimpleTest.java

I've used benchmark framework to test jbosscache with various sizes of the objects in the case.
Suprisingly in my tests, there was degradation of performance for bigger objects.
I've modifed StringTest.java in the way, that is PUT into cache random strings (with defined size).
For 50 character strings, cache performed 1800 PUTs/s for 4 nodes. But for 500 character strings, it was 750 and 2000 character strings it was just 50. 
In localMode (one-node), it run the same undepending on the string size.

I've double checked configuration, network, multicast - it looks ok.
(I've applied http://www.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/5.0.0/html/Administration_And_Configuration_Guide/jgroups-perf-udpbuffer.html, but it didn't change anything).

I've noticed one more strange behaviour: the random string I've generated with the function:
	   return RandomStringUtils.random(2000, true, true);
(RandomStringUtils comes from jakarta commons).
It generates strings consisting of standard characters and digits.
However when the generated string consists of all unicode characters
	return RandomStringUtils.random(500, true, true);
and the size was 500, the performance of the test was similar as 2000 standard characters string. Is it some problem with serialization of objects? (As far as I remember in JBoss you use custom serializer).

I've repeated those tests with Ehcache 1.7.2 and there was no significant drop of performance for 50/2000 chars strings.
I attach modified SimpleTest.java.


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