[Mono-list] mod-mono-server crash

["C. Bergström"]

Miguel de Icaza wrote:
> Hello,
>
>   
>> I have found that running through XSP2 directly we do not experience any 
>> crashes, but using mod-mono we do.
>>
>> I have seen at least one bug on mod-mono load issues - is anyone 
>> actively persuing these issues?
>>     
>
> I would like to add: if you observe a crash, we want to know the details
> about it.   Please file a bug report in bugzilla.ximian.com so we can
> track this.
>
> Provide as much information as you can on the bug report.   Remember
> that we do not have access to your machine, your setup, nor do we know
> anything about your application, so please describe the issues there.
>   
Download siege and run it against xsp for about a minute..

Here's the iostat output while doing so.
http://rafb.net/p/xmNZIS22.html

You can see it gets pretty cranky at line 172 forward.  This was at 100 
concurrent requests.  My general obversation is..

15 concurrent requests is no problem with xsp - all day
100 and you will crash in a fairly short time - couple minutes
300 I haven't had it take the testing server down, but it becomes pretty 
unresponsive - 1-10 secs

I can fairly accurately reproduce this any time.. Basic pages and using 
<%@ OutputCache Duration="6000" VaryByParam="none" %>

Using a basic page I don't actually get a backtrace from xsp, but it 
doesn't recover after you see that server unavailable message.  Which 
actually makes it much harder to deal with and recover.  I would poke 
and debug it more if I had time.

C.