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From "Matthew F. Dennis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-975) explore upgrading CLHM
Date Thu, 10 Jun 2010 22:08:16 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12877595#action_12877595
] 

Matthew F. Dennis commented on CASSANDRA-975:
---------------------------------------------

sorry for the delay the tests take quite a while to run on my laptop and CASSANDRA-1178 got
in the way (these tests were run with the patch from CASSANDRA-1178 applied).

Overall the new CLHM is just a bit slower in every test I ran (maybe I'm running the wrong
tests), reliably across multiple runs.  In addition a cursory glance at the memory usage in
jconsole while the tests were running shows the new CLHM using noticeably more memory; not
a lot but it was noticeable, maybe 4-8 percent more.

I noticed no stability issues or crashes in any of the tests.

> explore upgrading CLHM
> ----------------------
>
>                 Key: CASSANDRA-975
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-975
>             Project: Cassandra
>          Issue Type: Task
>            Reporter: Jonathan Ellis
>            Assignee: Matthew F. Dennis
>            Priority: Minor
>             Fix For: 0.8
>
>         Attachments: 0001-trunk-975.patch
>
>
> The new version should be substantially better "on large caches where many entries were
readon large caches where many entries were read," which is exactly what you see in our row
and key caches.
> http://code.google.com/p/concurrentlinkedhashmap/issues/detail?id=9
> Hopefully we can get Digg to help test, since they could reliably break CLHM when it
was buggy.

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