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From "Gerald Kaas (JIRA)" <>
Subject [jira] Commented: (AMQCPP-93) Performance analysis
Date Mon, 25 Jun 2007 21:28:33 GMT


Gerald Kaas commented on AMQCPP-93:

Timothy, thank you for the response. I understand your design and appreciate it. Unfortunately
without some design change performance cannot be improved. We are seeing the unmarshalling
code taking 4 times more CPU than our other two middleware products we use. Unfortunately
this not only impacts throughput but also causes CPU starvation away from the other threads/processes.
According to the profiler everything else looks great, but the unmarshaller has some simple
but major CPU problems. I don't know of any other way to improve on it other than use our
own marshaller and unmarshaller. This isn't as much as an issue since already have code in
place for one of our other middleware products we use. 

Making the changes I suggested will double your performance but it will require some changes
so that you can support EOF in the unsigned char read() operator. Either you can change the
declaration to bool read(unsigned char& c) and return true/false if it hit an EOF or have
the read functions through an EOF themselves. Either way I'm not sure if it pertains to this
issue anymore.

I hope my contributions will help if someone wants to take a look at the performance in the
future. I hope and wish everyone the best. Thank you for your help.

> Performance analysis
> --------------------
>                 Key: AMQCPP-93
>                 URL:
>             Project: ActiveMQ C++ Client
>          Issue Type: Task
>    Affects Versions: 2.0
>            Reporter: Nathan Mittler
>            Assignee: Nathan Mittler
>             Fix For: 2.2
>         Attachments: amqcpp-perf1.patch, amqcpp-perf1v2.patch, bench1.cpp, bench2.cpp,
DataInputStream.patch, DataOutputStreamv0.patch, patch Results.xls
> Do a performance analysis on openwire vs stomp.

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