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https://issues.apache.org/jira/browse/LUCENE-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dawid Weiss resolved LUCENE-4624.
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Resolution: Won't Fix
RUE was removed from Lucene anyway (and the one used in tests has some
simplifications but doesn't touch unsafe, etc.)
> Compare Lucene memory estimator with terracota's and Alex Shipilev's
> object-layout
> ----------------------------------------------------------------------------------
>
> Key: LUCENE-4624
> URL: https://issues.apache.org/jira/browse/LUCENE-4624
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Priority: Minor
>
> Alex Snaps informed me that there's a sizeof estimator in terracota --
> http://svn.terracotta.org/svn/ehcache/trunk/ehcache/ehcache-core/src/main/java/net/sf/ehcache/pool/sizeof/
> looks interesting, they have some VM-specific methods. Didn't look too deeply
> though; if somebody has the time to check out the differences and maybe
> compare the estimation differences it'd be nice.
> There is also another tool by Aleksey Shipilev. It looks very good to me
> (Aleksey has deep knowledge of JVM internals).
> https://github.com/shipilev/java-object-layout/
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