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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4338) Experiment with direct buffer in SequentialWriter
Date Thu, 10 Oct 2013 07:53:45 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13791289#comment-13791289
] 

Marcus Eriksson commented on CASSANDRA-4338:
--------------------------------------------

ok, thanks, doesnt look like a big difference then

i kind of like that the big dips in performance (caused by GC probably) are basically gone
though

> Experiment with direct buffer in SequentialWriter
> -------------------------------------------------
>
>                 Key: CASSANDRA-4338
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4338
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Marcus Eriksson
>            Priority: Minor
>              Labels: performance
>             Fix For: 2.1
>
>         Attachments: 4338.benchmark.png, 4338.benchmark.snappycompressor.png, 4338-gc.tar.gz,
gc-4338-patched.png, gc-trunk-me.png, gc-trunk.png, gc-with-patch-me.png
>
>
> Using a direct buffer instead of a heap-based byte[] should let us avoid a copy into
native memory when we flush the buffer.



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