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Date: Sat, 24 Mar 2012 23:14:27 +0000 (UTC)
From: "Vijay (Commented) (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Commented] (CASSANDRA-3997) Make SerializingCache Memory
 Pluggable
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    [ https://issues.apache.org/jira/browse/CASSANDRA-3997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13237722#comment-13237722 ] 

Vijay commented on CASSANDRA-3997:
----------------------------------

Have an update:

Jason Evan's says: "LD_PRELOAD'ing jemalloc should be okay as long as the JVM doesn't statically link a different malloc implementation.  I expect that if it isn't safe, you'll experience crashes quite early on, so give it a try and see what happens."

I have also conformed the unsafe isn't statically linked to native Malloc by adding a printf in the malloc c code which basically count's the number of times it is called. Looks like PRELOAD is a better option. I am running a long running test and will close this ticket once it is successful. Thanks!


> Make SerializingCache Memory Pluggable
> --------------------------------------
>
>                 Key: CASSANDRA-3997
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3997
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>              Labels: cache
>             Fix For: 1.2
>
>         Attachments: 0001-CASSANDRA-3997.patch, jna.zip
>
>
> Serializing cache uses native malloc and free by making FM pluggable, users will have a choice of gcc malloc, TCMalloc or JEMalloc as needed. 
> Initial tests shows less fragmentation in JEMalloc but the only issue with it is that (both TCMalloc and JEMalloc) are kind of single threaded (at-least they crash in my test otherwise).

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