[Seaside] Re: Seaside memory consumption?
m.coba.m at gmail.com
Wed Apr 30 15:12:27 UTC 2008
I have intended to use Monit, as I saw in a Ramon Leon's post. But I have
never play with it. I didn't know Munin, it is interesting.
Thanks for the tip.
On Tue, Apr 29, 2008 at 10:01 PM, Sebastian Sastre <ssastre at seaswork.com>
> Hi Miguel,
> you always have and share interesting experiences. I like to use Monit
> not only because you can set it to starts workers images but also you can
> set it to provide you of more details on the run. For instance you can set
> it send you an email alert when a worker mem is > 150MB or the CPU load
> average is >25% for more than 5 minutes. And, beside the cool email alert,
> you can preset reactions like restarting the worker, etc.
> That way your service dont need to reach perfection to be useful and
> when things go wrong with a worker it most probably restart in few minutes
> unnatended. I'm very satisfied with it. Also Munin is cool but it is for a
> different purpose, it plots lots of metrics evolutions in time of your
> servers so you can watch more general performance patterns.
> There are perfect setup how-tos for those interested,
> Sebastian Sastre
> *De:* seaside-bounces at lists.squeakfoundation.org [mailto:
> seaside-bounces at lists.squeakfoundation.org] *En nombre de *Miguel Cobá
> *Enviado el:* Martes, 29 de Abril de 2008 20:55
> *Para:* Seaside - general discussion
> *Asunto:* Re: [Seaside] Re: Seaside memory consumption?
> On Tue, Apr 29, 2008 at 2:40 PM, Andreas Raab <andreas.raab at gmx.de> wrote:
> > Philippe Marschall wrote:
> > > Honestly this is a very hard question that probably only marketing
> > > developments can answer seriously (JEE is twice as fast as .Net). If
> > > have seen such numbers for no web framework. There are so many free
> > > variables. How have active users, what session lifetime, how active
> > > are they, do they come in bursts, how complicated is your site, what
> > > image do you have, which VM, which GC settings, which patches, which
> > > OS, which CPU, .... . Out of the blue I would say Seaside and Magritte
> > > are probably the most memory hungry choices you can make. Lots of
> > > classes, lots of objects, lots of block contexts, .... Having that
> > > said I know of no one who has run into memory problems with Seaside /
> > > Magritte but this means very little. In general persistence is often
> > > bottleneck. As you run code besides it I doubt any numbers would be
> > > applicable to you.
> > >
> > I fully understand the number of variables in the setup so what I'm
> > looking for is whether anyone has experimented with -say- running Seaside
> > inside a 128MB environment for a given site and load factor and what their
> > experiences were. For example, what does a small Pier deployment require?
> > (IIRC, it is built on top of Magritte so this may be the closest in kind)
> I had my app running from a VPS with just 256MB RAM. Of course after the
> OS, apache, mysql, it lefted just 100MB or so. It was just imposible to
> work. So I upgraded to 512MB RAM and all was running ok for days without
> problems with my app.
> The image virtual memory grew and grew until took the entire remaining RAM
> to the point that I couldn't login with ssh. Not memory for forking a ssh
> procces was left. I had to restart the server to take control of it (the
> image didn't started automatically). I found an option for the squeakvm to
> limit the max memory available (it is not available because if the images
> need more memory it will begin to swap and will be slow, but men, it
> After reboot, I was left with 350 MB free before running my image. So I
> started the image with
> squeakvm -mmap 300m -headless deploy.image
> so the squeak used at most 300 mb and the os had 50 MB for ssh logins.
> Also, I changed Apache for lighttpd with fastcgi so to reduce the RAM
> Miguel Cobá
> > In general people who come up with such questions have an idea about
> > > the load they'll face or have to support so they can write tests.
> > >
> > Yes, I certainly do (it'd be in the range of 1-2 man-hours of use a day,
> > basically filling in a bunch of forms and running a few reports mostly by a
> > single user). But I'm not going to run a big test suite for something that
> > is supposed to be a very small application. I just want to make sure I'm not
> > going to screw up the production app by running Seaside next to it.
> > What
> > > > about memory consumption of Seaside apps that run for several months
> > > > without
> > > > restart (session cleanup etc)?
> > > >
> > >
> > > Session cleanup happens even without restarts. If you run the
> > > WeakDictionary patches of Martin van Löws (I hope I got the name
> > > right) you can override SeasidePlatformSupport class >>
> > > #weakDictionaryOfSize: which should release sessions earlier. I have
> > > seen images that run without troubles for months and images that have
> > > trouble staying up for more than a few days.
> > >
> > Thanks, that's good to know, too. Where are these patches?
> > Cheers,
> > - Andreas
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