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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-1969) Use BB for row cache - To Improve GC performance.
Date Mon, 04 Apr 2011 03:27:06 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13015263#comment-13015263
] 

Jonathan Ellis commented on CASSANDRA-1969:
-------------------------------------------

what is the hack/workaround?

> Use BB for row cache - To Improve GC performance.
> -------------------------------------------------
>
>                 Key: CASSANDRA-1969
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1969
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>         Environment: Linux and Mac
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>         Attachments: 0001-Config-1969.txt, 0001-introduce-ICache-InstrumentingCache-IRowCacheProvider.txt,
0002-Update_existing-1965.txt, 0002-implement-SerializingCache.txt, 0002-implement-SerializingCacheV2.txt,
0003-New_Cache_Providers-1969.txt, 0003-add-ICache.isCopying-method.txt, 0004-Null-Check-and-duplicate-bb.txt,
0004-TestCase-1969.txt, 1969-rollup-and-config.txt, 1969_Cache_SVN_Patch.diff, BB_Cache-1945.png,
JMX-Cache-1945.png, Old_Cahce-1945.png, POC-0001-Config-1945.txt, POC-0002-Update_existing-1945.txt,
POC-0003-New_Cache_Providers-1945.txt
>
>
> Java BB.allocateDirect() will allocate native memory out of the JVM and will help reducing
the GC pressure in the JVM with a large Cache.
> From some of the basic tests it shows around 50% improvement than doing a normal Object
cache.
> In addition this patch provide the users an option to choose BB.allocateDirect or store
everything in the heap.

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