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From: Rob Davies <rajdavies@gmail.com>
To: users@activemq.apache.org
In-Reply-To: <4A07BCF2.8030504@tweakers.net>
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Subject: Re: too many open files
Date: Mon, 11 May 2009 06:56:53 +0100
References: <23473539.post@talk.nabble.com> <4A07BCF2.8030504@tweakers.net>

thanks Arjen - need to get add a Faq entry for this!

On 11 May 2009, at 06:51, Arjen van der Meijden wrote:

> There may be at one or more of these three issues that I ran into:
>
> - You actually have a too low setting for the open files. Try  
> increasing it (see man ulimit etc, be careful that normally only  
> root can increase it beyond 1024, but other programs, including su  
> do inherit it).
>
> - You're opening and closing connections too fast, this is what we  
> had:
> http://issues.apache.org/activemq/browse/AMQ-1739
> Adding the "?transport.closeAsync=false"-parameter to the url helped  
> us here.
>
> - You're queues may be getting larger than the limits. Especially  
> the 5mb per queue limit in the default configuration is easy to hit.  
> Once I raised the global limits and removed the per-queue/topic  
> limits it has worked stable for several months in a row (since feb  
> 19 our single broker has queued and dequeued over 300M tiny messages).
>
> 30 and 250 producers isn't that many, so unless they're maxing out  
> your broker system on some other resource than file pointers, my  
> guess is the single machine should be able to handle them.
>
> Best regards,
>
> Arjen
>
> On 10-5-2009 22:03 DataMover wrote:
>> I have seems several posts on this but I have not been able to  
>> solve our
>> situation.
>> We have 30 clients (producers) working with one activemq server.
>> All worked amazingly well.
>> Then we tried a test with around 250 clients.
>> That would get many transport errors.
>> Increasing the file limits on the os caused the system to come to a  
>> crawl
>> with no benefit.
>> I am assuming the problem can be solved with multiple brokers being  
>> run.
>> One question is do they have to be on different machines, or can we  
>> have
>> multiple activemqs running on the same server, each listening on a  
>> different
>> ip?