[Mono-list] Thread Pool issues

dwright01 dwright at unidesk.com
Mon Dec 7 08:52:19 EST 2009

We are experiencing a problem that appears to have been posted before, but
I'm not clear on the solution. 

The problem is we have a web service using mod_mono on Apache
2.2.13.  The problem occurs when a lot of simultaneous web requests come in,
and/or we spawn a lot of background threads (by "a lot" I mean about 20-25). 
At this time, one of our web service threads gets a ThreadAbortException,
and httpd's error_log says:
"[Tue Nov 24 21:12:21 2009] [error] Maximum number (20) of concurrent
mod_mono requests to /tmp/mod_mono_dashboard_default_2.lock reached.
Dropping request."

httpd processes abound, and the mod_mono process runs at 100% CPU until we
reboot the system.

We have 512MB memory on the web server machine, and it is a virtual machine
on VMWare.

What would you recommend to avoid this problem?  Does anyone know why the
system doesn't recover if we stop beating on it?

David Wright

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