[Mono-aspnet-list] issues with intermittent apache hangups

[Sergey Lobko-Lobanovsky]

Hello Dan,

Did you finally revert to using the MS stack?

I wonder if the issues described in this thread are still happening to
others :)

By the way, my setup back then also used fluent nhibernate, but I don't
remember the exact version, as it was a year ago.

Sergey.

On Fri, Jul 22, 2011 at 12:32 PM, Dan <parnham at gmail.com> wrote:

> An update on where we are with this issue!
>
> The libraries that we are now using are as follows:
> mono 2.10.2
> fluent nhibernate 1.2 (nhibernate 3.1)
> MVC3
>
> We've spent the past couple of months trying to figure out why our
> applications are leaking memory and have found a few worrying issues. I
> won't go into details about some of the problems we've seen but will
> concentrate on the leaks since they cause the web applications to gradually
> grind to a halt.
>
> I developed a test application (MVC 2 & 3) which contained some simple
> javascript to poll the server very quickly. Monitoring this with the mono
> profiler we found that it never seemed to be garbage collecting the
> CacheItems. However it didn't leak at the same rate as our full web
> applications so something else was going on too.
>
> Finally with a lot of experimentation we have found that if we switch our
> web applications to sessionless (sessionState mode="Off" in Web.config)
> they
> no longer seemed to leak CacheItems and we found that running nhibernate in
> "thread_static" mode did not seem to leak but "web" did. Since we couldn't
> leave it as thread_static for the web applications we switched to our own
> simplified CurrentSessionContext implementation.
>
> With those changes our web applications appeared to no longer leak, but in
> fact the applications stopped leaking when running in XSP and as soon as we
> deploy to mod_mono they happily start chewing up memory again.
>
> We are also developing a daemon to run alongside the web applications that
> uses the same fluent based data provider as the web application (although
> running in thread_static mode) and the memory usage for that appears to be
> solid, so we know it is not a problem with our data provider
> implementation.
> All the evidence seems to point towards the System.Web related libraries
> (with hints of CacheItem and HashMap thrown in), but we are not familiar
> enough with how it all works to even know where to begin looking, and
> frankly we've wasted too much time on this already.
>
> We have been trying to solve these issues for so long now that we're having
> to seriously consider deploying to .NET, despite the fact that we've
> invested a lot of time in building a linux-based server module for the
> daemon and web applications.
>
> If we are no longer seeing leaks using XSP, is there a possibility that we
> could deploy our web application using that instead of mod_mono (by setting
> up apache with mod_proxy)?
>
> Regards,
> Dan
>
>
>
> --
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