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From "Robbie Gemmell (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-3610) set TCP_NODELAY true by default in the Java client to improve general performance
Date Fri, 11 Nov 2011 14:50:51 GMT

    [ https://issues.apache.org/jira/browse/QPID-3610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148518#comment-13148518
] 

Robbie Gemmell commented on QPID-3610:
--------------------------------------

I considered the JIRA title and description sufficient? Do we have documentation that it is
false by default that I need top update?
                
> set TCP_NODELAY true by default in the Java client to improve general performance
> ---------------------------------------------------------------------------------
>
>                 Key: QPID-3610
>                 URL: https://issues.apache.org/jira/browse/QPID-3610
>             Project: Qpid
>          Issue Type: Improvement
>          Components: Java Client
>    Affects Versions: 0.14
>            Reporter: Robbie Gemmell
>            Assignee: Robbie Gemmell
>             Fix For: 0.15
>
>
> set TCP_NODELAY true by default in the Java client to improve general performance.
> TCP_NODELAY is currently set false by default. This leads to synchronous commands such
as ExecutionSync or TxCommit taking a potentially very long amount of time (~30-40ms observed),
which cripples transactional performance, causes consumer creation to take a long time, and
generally impedes performance of messaging patterns such as request-response.
> Whilst this change could perhaps cause some falloff in out-the-box peak throughput in
situations such as NoAck mode, the observed performance increases in a variety of other situations
such as the above is too large (anything from 10% to 1000%, yes 10x throughput, has been observed
in select tests) to ignore for our general out-the-box configuration. Users interested in
the ultimate throughput will be the ones most likely to tune for it, so we should set default
configuration to cater for those who arent/dont.

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