[Mongrel] Mongrel and memory usage

Will Green will at hotgazpacho.com
Mon Nov 5 15:47:25 EST 2007

Which Image processor are you using for attachment_fu? If you're using RMagick, it is notorious for 
memory leaks. Look at mini_magick or ImageScience as a replacement.

Will Green

Kirk Haines wrote:
> On 11/5/07, Thomas Balthazar <thomas.tmp at gmail.com> wrote:
>> Thanks for your answer.
>> I'm using ruby 1.8.5 (2006-08-25) [i486-linux].
>> The Rails app uses those plugins :
>> * acts_as_taggable_on_steroids
>> * attachment_fu
>> * exception_notification
>> * localization
>> Which kink of issues with my code could use that much memory?
>> If I load lots of records with Active Records, aren't they "unloaded" at
>> some times?
> Does your code or any of those pluginx use Array#shift?  There was a
> bug with Array#shift which still existed in 1.8.5 which basically left
> stuff inside the array data structure after a shift, so that those
> things didn't get GCd when they should have.  It's a sneaky bug that
> can easily eat a lot of memory.
> Otherwise, can you start a test instance of your application, and then
> test it to see if there are certain actions which cause the memory
> growth.  That would help you pinpoint where the likely problems are.
> Just use ab or httperf to send a large number of requests to specific
> urls in your app, and see how ram usage changes as you do that.
> Kirk Haines
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