Using ThreadPool.QueueUserWorkItem in ASP.NET in a high traffic scenario

I’ve always been under the impression that using the ThreadPool for (let’s say non-critical) short-lived background tasks was considered best practice, even in ASP.NET, but then I came across this article that seems to suggest otherwise – the argument being that you should leave the ThreadPool to deal with ASP.NET related requests.

multiprocessing.Pool – PicklingError: Can’t pickle : attribute lookup thread.lock failed

multiprocessing.Pool is driving me crazy…
I want to upgrade many packages, and for every one of them I have to check whether there is a greater version or not. This is done by the check_one function.
The main code is in the Updater.update method: there I create the Pool object and call the map() method.