[Mongrel] Mongrel and memory usage

Thomas Balthazar thomas.tmp at gmail.com
Mon Nov 5 13:27:33 EST 2007

On 11/5/07, Steve Midgley <public at misuse.org> wrote:
> At 09:17 AM 11/5/2007, you wrote:
> > > 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
> Thanks Kirk - I guess I'm totally OT at this point, but I hadn't heard
> about this bug before. From your description this is a specific problem
> to the underlying C code implementing shift, which is not found in
> related functions? So "array.slice!(0)" would be identical in function
> to shift but not contain this leak?
> Thanks again,
> Steve
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Thanks everybody for all those informations.
I'll make some tests and I'll keep you posted.
I won't have the time to run those tests this week, but I won't forget
to post the results on the list.


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