[jira] [Commented] (CASSANDRA-3295) reduce default heap size

["Brandon Williams (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-3295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120165#comment-13120165 ] 

Brandon Williams commented on CASSANDRA-3295:
---------------------------------------------

I think it would make more sense to make the minimum cap 1G instead of 512M.  You _can_ run with 512M, but our 'norm' has always been 1G and things do run much better that way.
                
> reduce default heap size
> ------------------------
>
>                 Key: CASSANDRA-3295
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3295
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 1.0.0
>            Reporter: Jonathan Ellis
>            Assignee: satish babu krishnamoorthy
>            Priority: Minor
>             Fix For: 1.0.0
>
>         Attachments: 3295.patch
>
>
> With off-heap caching now the default and with auto-flushed memtables demonstrated to do a good job with smaller heaps, I think it's time to reduce heap sizes to decrease GC pause times.
> How does this sound?
> - half the ram, up to 512MB, or
> - 1/4 the ram, up to 4 GB
> i.e.:
> max(min(1/2 ram, 512MB), min(1/4 ram, 4GB))

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