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From "Vijay (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1969) Use BB for row cache - To Improve GC performance.
Date Mon, 31 Jan 2011 17:36:29 GMT


Vijay commented on CASSANDRA-1969:

Hi Jonathan,

1) Can We catch for OOM when creating direct memory? and log it and return null so it is not
affecting the normal operations?
2) Can we add a JVM parameter to limit the JVM direct memory allocations (Which will include
the allocations for Page Cache)?

> Use BB for row cache - To Improve GC performance.
> -------------------------------------------------
>                 Key: CASSANDRA-1969
>                 URL:
>             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,
0003-add-ICache.isCopying-method.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
> In addition this patch provide the users an option to choose BB.allocateDirect or store
everything in the heap.

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