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Date: Wed, 7 Oct 2009 10:33:03 -0700 (PDT)
From: nkleinsch <nkleinsch@lucidmedia.com>
To: users@activemq.apache.org
Subject: Re: Latency causing throughput problems in ActiveMQ 5.2
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Adding some of the things I've tried in case they'd be of help to other
people in the future.

- Disabled producer flow control
(http://activemq.apache.org/producer-flow-control.html) - Did nothing for
client throughput

- Switched pendingSubscriberPolicy to a VM cursor
(http://activemq.apache.org/message-cursors.html) - Did nothing for client
throughput

- Tried changing the prefetch limit
(http://activemq.apache.org/what-is-the-prefetch-limit-for.html) - Did
nothing for client throughput. Given that the default was the max value for
nonpersistent topics, I didn't think this would do anything, but tried it
just in case.

- Set Async Sends on the producer
(http://activemq.apache.org/async-sends.html) - Did nothing for client
throughput. This was also the default, but checked it to make sure.

Is there anything else I haven't tried here that could help improve
performance? I've read through all the FAQs and performance documents and am
running out of ideas.

- Nick


nkleinsch wrote:
> 
> Hi all,
> 
> I'm having throughput issues on ActiveMQ 5.2 and was hoping for some tips
> to improve performance. We're sending out messages on a topic at an
> average rate of around 150/sec. The messages are object messages that vary
> in size, but range up to 5 kilobytes. We're using a network of brokers
> between two sites, with all the producers in one site and the consumers in
> the other. We're seeing memory fill up on the producing site broker and
> the "messages received" falling behind "messages sent", implying that
> we're not able to send them over to the receiving side broker quickly
> enough. These messages don't need guaranteed delivery, so we're not using
> transactions or durable subscriptions.
> 
> I set up a test between the two sites using the ActiveMQ Performance
> Module. I'm using a stock ActiveMQ 5.2 and the ActiveMQ Performance Module
> from the latest SVN. I'm running ActiveMQ on a server in site 1. If I run
> the producer and consumer on another server in site 1, I get a system
> average throughput of 5184. If I run the same test, except with the client
> on a similarly configured server in site 2, I get a throughput of 112.
> 
> The transfer rate between the two servers is upwards of 3 MB/s, so I
> assume it isn't a bandwidth limitation. The latency between the two sites
> (measured using ping) is 90ms. Why would latency have such a large effect
> on my message throughput rate? Are there any settings I could change that
> would help my performance?
> 
> Thanks,
> Nick Kleinschmidt
> 

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