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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1969) Use BB for row cache - To Improve GC performance.
Date Sun, 30 Jan 2011 18:59:44 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988632#action_12988632
] 

Vijay commented on CASSANDRA-1969:
----------------------------------

Thanks Jonathan, This indeed looks cleaner than allocateDirect.... wasnt aware of jna.Memory
earlier.... 

Regarding "and allocation is O(N)" --- It provides O(1) as it is backed by Queue and HashMap
(which can have maximum of Integer.Max elements in HM) ... the idea was to reduce the number
of operations while write..... With the assumption that the GC will cleanup the WeekReference
immediately, and wont grow or fragment.... 

+1 for Jonathan's approach....

> 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-implement-SerializingCache.txt, 0002-Update_existing-1965.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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