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From "William (Commented) (JIRA)" <>
Subject [jira] [Commented] (AMQ-3454) Contention on a mutex during a stress when using SimpleAuthenticationPlugin
Date Mon, 28 Nov 2011 16:01:40 GMT


William commented on AMQ-3454:

Hi guys,

It's great you made improvement about performance by removing this unnecessary copy and thank
your for taking into account my comment.

Do you plan to make a patch for 5.5.1 ? I'd like to have something proper in order to use
it production. This gain of performance can really help me...

Or perhaps in 5.6.0, will it come out soon ?

Futhermore, in my understanding of getDestinationMap method, it is used to determine the presence
of a destination and BrokerRegion class still makes a copy of queue's map and topic's map
? Tell me if I am wrong.... 

So, if I'm right about the hypothesis, can't you improve the performance again by adding a
new method destinationExists(String destinationName) that just makes a containsKey in the
hashmap. Thus we can also remove the copy in all the use cases in which you try to find out
if a destination exists or not.

In any case, even a get() in multiple hashmap is better than a copy, specially when the hashmap
is big.

> Contention on a mutex during a stress when using SimpleAuthenticationPlugin
> ---------------------------------------------------------------------------
>                 Key: AMQ-3454
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.5.0
>            Reporter: William
>            Assignee: Gary Tully
>            Priority: Critical
>             Fix For: 5.6.0
>         Attachments: RWLockDestinations.txt,, amq-dump
> I am testing ActiveMQ 5.5 with my own stress test. I tried to implement a stress test
that use jms ressource in the same fashion that my application would do. 
> For that, I used jms template (from Spring) and  a pooled connection factory (as recommended).
I run a fixed number of thread that plublish on fixed number of topics. Each thread pick up
a topic and enter a loop that will send a message on the choosen topic.
> The issue is reproductible with SimpleAuthenticationPlugin active.  
> Configuration of the test : 
> * 100 topics
> * more than one thread per topic (actually 1500 producer threads)
> Common connection properties :
> * alwaysSessionAsync=false
> * dispatchAsync=false 
> * optimizeAcknowledge=true
> * socketBufferSize=131072&trace=true&wireFormat.cacheSize=2048&wireFormat.tcpNoDelayEnabled=true&wireFormat.tightEncodingEnabled=true&keepAlive=true&soTimeout=10000&connectionTimeout=10000\
> Producers : 
> * Message are not persistent
> * There is no transaction
> * Message expiration time is 30s
> * Unsing JMS template singleton with a PooledConnectionFactory
> * 3 JVM running 
> * connection options alwaysSyncSend=true,copyMessageOnSend=false
> Consumers :
> * just listening to each topic with a SimpleMessageListenerContainer and count messages
> * 3 JVM running 
> In attachment, you will find activemq config file and thread dumps. I can attach the
producer/consumers code if you need it but I think you have your own tests.
> This Jira is critical for me because security is mandatory for our use.
> If you need more information, please ask.

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