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https://issues.apache.org/jira/browse/CASSANDRA-2203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12997281#comment-12997281
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Jonathan Ellis commented on CASSANDRA-2203:
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(For Cassandra you will want to configure it with omitSharedBufferOverhead.)

> Class to measure real memory allocated for an object
> ----------------------------------------------------
>
>                 Key: CASSANDRA-2203
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2203
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Chris Goffinet
>            Assignee: Chris Goffinet
>            Priority: Trivial
>         Attachments: 
> 0001-Class-to-measure-actual-object-size-for-Hotspot-JVM.patch
>
>
> We wanted to share a class we are using internally to measure actual object 
> sizes for Hotspot VM. We've been using this on RowCache and Memtables.

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