Logical threads vs. physical threads

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bjoseluisb - 20 Jul 2004 11:40 GMT

Hi all,

I'm using ThreadPool.QueueUserWorkItem to handle work requests from a
Windows Service. I've been using the performance monitor to trace the
number of physical threads and the number of logical threads in the
LocksAndThreads counters. I'm seeing 28 physical threads, but only 1
thread associated to the service process.
Should I infer that the only physical thread is doing all the work for
the 28 logical threads?

Thank you in advance for your help

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Richard Grimes [MVP] - 26 Jul 2004 21:58 GMT

> Hi all,
>
[quoted text clipped - 5 lines]
> Should I infer that the only physical thread is doing all the work for
> the 28 logical threads?

At the moment .NET threads map one to one with physical threads (this is an
implementation detail, it may change in future versions of the framework).
By default the ThreadPool has 25 .NET threads, ie 25 Win32 threads. In
addition there are threads being used by the garbage collector (there is a
finalization thread as well as a thread used to perform the GC) and there is
the main thread of your process. That comes to 28 physical/.NET threads :) I
guess the LocksAndThreads counter is only showing the worker threads (ie
your main thread) used by your process, but I don't know for sure.

Richard

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Logical threads vs. physical threads

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