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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-4865) Off-heap bloom filters
Date Mon, 29 Oct 2012 22:21:11 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-4865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vijay updated CASSANDRA-4865:
-----------------------------

    Attachment: 0001-CASSANDRA-4865-v2.patch

Attached patch includes the nit and updated tests.

re-ran the test on 32 cores and shows bigger diffrence.

||593|495|658|408|132|392|
||606|479|749|394|130|556|
||542|452|736|394|130|554|
||543|460|736|395|129|555|
||542|452|736|391|129|554|
||541|465|735|391|129|555|
||542|454|737|392|129|555|
||541|452|736|391|130|554|
||542|452|735|391|129|554|
||542|452|736|391|130|554|
||542|519|736|391|130|554|

ran stress just for fun
before: aprox 2750
after: aprox 2800

Its a big win for a small change i guess :)
                
> Off-heap bloom filters
> ----------------------
>
>                 Key: CASSANDRA-4865
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4865
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Vijay
>             Fix For: 1.2.1
>
>         Attachments: 0001-CASSANDRA-4865.patch, 0001-CASSANDRA-4865-v2.patch
>
>
> Bloom filters are the major user of heap as dataset grows.  It's probably worth it to
move these off heap.  No extra refcounting needs to be done since we already refcount SSTableReader.

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