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From "Aaron Whiteside (Updated) (JIRA)" <>
Subject [jira] [Updated] (CAMEL-4863) Using <threads>/threads() is ALOT slower than using the seda:endpoint
Date Thu, 05 Jan 2012 21:06:40 GMT


Aaron Whiteside updated CAMEL-4863:

    Attachment: camel-threads-vs-seda-testcase.tar.gz

As per

*Camel 2.4 onwards behavior*
The threads DSL leverages the JDK concurrency framework for multi threading. It can be used
to turn a synchronous route into Async. What happens is that from the point forwards from
threads the messages is routed asynchronous in a new thread. Camel leverages the asynchronous
routing engine, which was re-introduced in Camel 2.4, to continue routing the Exchange asynchronously.

I have attached an example which shows how using threads() DSL seems to result in the route
being executed in a single thread from the thread pool and that the initial thread waits for
the thread in the thread pool to finish before returning... 

However the example using the seda endpoint is much faster and results in all threads in the
thread pool executing the work, without the initiating thread waiting for them to complete.
> Using <threads>/threads() is ALOT slower than using the seda:endpoint
> ---------------------------------------------------------------------
>                 Key: CAMEL-4863
>                 URL:
>             Project: Camel
>          Issue Type: Bug
>          Components: camel-core
>    Affects Versions: 2.9.0
>         Environment: JBoss 7.1 CR1b
>            Reporter: Aaron Whiteside
>            Priority: Critical
>              Labels: performance, seda, threading, threads
>         Attachments: camel-threads-vs-seda-testcase.tar.gz
> Snippets from my routing file:
> {code:xml}
> <threads maxPoolSize="10" maxQueueSize="10">
>    <to uri="jms:queue:testQueue?deliveryPersistent=true"/>
> </threads>
> {code}
> compared to:
> {code:xml}
> <to uri="seda:test?concurrentConsumers=10&size=10"/>
> {code}
> {code:xml}
> <from uri="seda:test?concurrentConsumers=10&size=10"/>
> <to uri="jms:queue:testQueue?deliveryPersistent=true"/>
> {code}
> Using <threads> I get about 600 requests/per second.
> Using seda endpoint I get about 3000 requests/per second.
> Looking at the thread pools created by Camel in jconsole: I can see that the one created
by <threads> is mostly idle as compared to the one created by the seda endpoint which
is always busy.
> Also in the MBean Camel creates for it's managed thread pools, for the ThreadPool created
by <threads> the TaskQueueSize attribute is almost always 0 and never more than 1. This
is in contrast to the TaskQueueSize attribute on ThreadPool created by the seda endpoint which
is always 10 (the seda queue size, and obviously until all the tasks have completed).

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