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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, 31 Jan 2011 04:59:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988644#comment-12988644
] 

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

The problem was that WeakReferences are only cleaned up in full collections (CMS or STW),
so if GC is tuned correctly you won't be seeing that happen much, and you'll be doing a lot
of queue iterations.

> 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, 0003-New_Cache_Providers-1969.txt,
0004-TestCase-1969.txt, 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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