mono process - high number of threads

I'm testing a server process running with mono under heavy load.

The server app handles the max number of threads that are available to 
handle client requests (32) and I can assure you that no new threads are 
created from our C# code.

However, I see that the number of threads used by the mono process 
doesn't stop growing (from 15 to 241 after 2 hours of execution time)

I use 'ps -o nlwp <pid>' to monitor the process threads.

Could you explain me why this is happening?

Is there any way to see if mono is launching new threads itself and why?

Rubén.
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