[Mongrel] mongrel memory usage ballooning and process stomping

Matthew Whittaker mwhitt89 at gmail.com
Wed Jan 17 16:45:50 EST 2007

I am seeing this same problem on my debian production server.  top  
shows the correct number of processes, but each mongrel instance and  
ruby running backgroundrb all are ballooning to 15% memory  
consumption within a day or two.  The application is http:// 

It may be in the code, but how do I troubleshoot this?


On Jan 17, 2007, at 2:34 PM, Ezra Zygmuntowicz wrote:

> 	Some linux distros have weird reporting of processes. I have seen it
> where top or ps will report 3 mongrels for each one that is really
> running. And looking at your output you can see that each set of
> three mongrels reported have the same port number. This means that
> you really only have 3 mongrels running because only one can be
> running per port at a time.
> 	As far as the memory usage goes, that sounds like a classic memory
> leak in your rails app. I have seen mongrel balloon like that when
> people add an extra :include directive to a find that ends up loading
> a ton of extra records into memory. If you are loading more then a
> few hundred ActiveRecords into memory on any one page then that will
> surely cause memory to ballon like this.
> 	A little more info about your app and what it does woudl help debug.
> Are you using Rmagcik? Are you useing send_file or send_data to
> stream out large content?
> Cheers-
> -Ezra
> On Jan 17, 2007, at 10:36 AM, Michael Biven wrote:
>> How are the mongrel started (cron, launchd, etc)? I had something
>> similar happen to me, but I think it was from the cluster being
>> started by root instead of the user I wanted to start it. It gave me
>> an extra set of mongrel processes running that mongrel_rails
>> cluster::stop wouldn't stop.
>> Michael B.
>> On 1/17/07, Surendra Singhi <singhi.surendra at gmail.com> wrote:
>>> Hi,
>>>   I have mongrel 0.3.14, with ruby 1.8.5, rails 1.1.6 and mongrel
>>> cluster
>>> 0.2.1, on debian sage 3.1 with apache 2.0, and fastthread 0.6.1.
>>> I am load balancing 3 mongrel processes using the random port trick.
>>>  When I start mongrel the processes have about 60MB, but after
>>> some hour of
>>> usage the memory ballons upto more than 180MB and the site becomes
>>> terribly
>>> slow. Forcing me to restart mongrel cluster.
>>> Also, it reports me 9 mongrel processes instead of three. I am not
>>> able to
>>> understand why that's happening. Are really 9 mongrel processes
>>> started
>>> instead of three?
>>> Please help. Thanks.
>> -- 
>> Michael Biven
>> michael.biven at gmail.com
>> http://biven.org
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> -- Ezra Zygmuntowicz 
> -- Lead Rails Evangelist
> -- ez at engineyard.com
> -- Engine Yard, Serious Rails Hosting
> -- (866) 518-YARD (9273)
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