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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4222) Improve serializing off-heap cache by not using finalizers
Date Fri, 04 May 2012 20:12:48 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268676#comment-13268676
] 

Marcus Eriksson commented on CASSANDRA-4222:
--------------------------------------------

it shouldnt leak memory right? given that the cache eviction listener in SerializingCache
unreferences everything that gets evicted from the cache
                
> Improve serializing off-heap cache by not using finalizers
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-4222
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4222
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Marcus Eriksson
>         Attachments: 0001-Remove-finalizers-in-FreeableMemory-and-Memory-to-im.patch
>
>
> We have a cluster that takes alot of reads and we have some issues with the off-heap
caching, seeing several G of Finalizer objects on the heap
> My conclusion is that the finalizer thread is too slow to run the finalize method on
the FreeableMemory (and Memory) objects.
> Simply removing the finalize() methods improves performance _alot_ (using finalizers
is 50% slower in my micro benchmarks) and does not leak memory during "normal" use as far
as i can see
> im not sure about the implications for other use cases though

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