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From "Andrew Stitcher (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-3883) Using application headers in messages causes a very large slowdown
Date Mon, 05 Mar 2012 19:21:57 GMT

    [ https://issues.apache.org/jira/browse/QPID-3883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222529#comment-13222529
] 

Andrew Stitcher commented on QPID-3883:
---------------------------------------

These changes (which should be in 0.16) improve the 10 headers case from 55,000 Msg/s to about
80,000 Msg/s.

They address some inefficiencies in the Field Table implementation by avoiding most unnecessary
decode/encodes.
They remove the most obvious unnecessary broker copies of FieldTables (in the Exchange interface)

There is still some way to go though.
                
> Using application headers in messages causes a very large slowdown
> ------------------------------------------------------------------
>
>                 Key: QPID-3883
>                 URL: https://issues.apache.org/jira/browse/QPID-3883
>             Project: Qpid
>          Issue Type: Improvement
>          Components: C++ Broker, C++ Client
>    Affects Versions: 0.14
>            Reporter: Andrew Stitcher
>            Assignee: Andrew Stitcher
>
> Messages that have application headers have a very high overhead compared to messages
that don't have application headers.
> There are multiple causes of this problem:
> * Messages are copied unnecessarily in the client code
> * Encoding/decoding FieldTables is inefficient
> * Encoding/decoding FieldTables is done unnecessarily
> * Copying FieldTables is inefficient
> * The mapping of Variants to the current underlying FieldTable implementation may be
inefficient

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