Hello, Günter!

According to the SOS output you have:
- something is utilizing your CPU on 100%
- worker threads aren't doing anything
- there are three timers that use threadpool
- max number of completion port threads that can be creates is 25.
- there 5 completion port threads doing something

IMO you need more details like !threads command.

Also have a look at (
http://blogs.msdn.com/tess/archive/2006/02/23/asp-net-performance-case-study-web
-service-calls-taking-forever.aspx )
.

HTH
--
With best regards, Vadym Stetsiak.
Blog: http://vadmyst.blogspot.com

You wrote  on Wed, 16 Jan 2008 11:13:22 +0100:

GP> Hello!

GP> I have the following SOS output:

GP> 0:000> !threadpool
GP> CPU utilization 100%
GP> Worker Thread: Total: 2 Running: 0 Idle: 2 MaxLimit: 25 MinLimit: 2
GP> Work Request in Queue: 0 --------------------------------------
GP> Number of Timers: 3 --------------------------------------
GP> Completion Port Thread:Total: 5 Free: 0 MaxFree: 4 CurrentLimit: 2
GP> MaxLimit:
GP> 25 MinLimit: 2

GP> I cannot find anything about the "Completion Port Thread" counters.
GP> The
GP> MaxLimit has the value that is set within the application by the
GP> System.ThreadPool class. But what meens "CurrentLimit" or
GP> "MaxLimit"? And  specially: What meens "Free: 0"? If it meens that
GP> there are no threads free  for IO Completions that would be also the
GP> observed behavior.

GP> Any toughts?

GP> GP