Playing with DNN 700 CE RC (2 parent and 2 child sites), no or default content, make some Recycle App Pool via Tools menu, and view than w3wp.exe grown each recycle from 80 Mo to 140 Mo.
IIS 7.5 express, SQL 2K12 Express, Dedicated App Pool per instance, with site isolation

Is there any recommended configuration for IIS application pool and recycle ? 

---

Julien Girerd
  

Can you try the same using full blown IIS. IIS Express is not production grade ... In order to investigate yourself, you could maybe use Ants MemoryProfiler by RedGate, or a similar tool...

---

Erik van Ballegoij, Former DNN Corp. Employee and DNN Expert

DNN Blog | Twitter: @erikvb | LinkedIn:

This is NOT a Memory Leak.

1. The text on the tools menu is actually incorrect – it should be “Recycle Application”.  We are not recycling the Application Pool – you need full trust to do that from a web app.
2. We restart the application by “touching” the web.config file.  When this happens ASP.NET restarts the application for any new requests, but it does not immediately recover the memory taken by the old instance of the application.   All the cached objects in the ASP.NET Cache and all the loaded assemblies remain loaded.
3. Memory management in the Application Pool is managed automatically by IIS.  Periodically it will recover memory taken up by applications that are no longer active.  What you are seeing is IIS has determined that as there is plenty of memory available it does not need to go through the expense of recovering the memory – the default time-out in IIS to shut-down inactive applications is 20 minutes.  This is quite normal in memory Management, as the process of unloading applications is quite expensive.

---

Charles Nurse Chief Architect Evoq Content Team Lead, DNN Corp. Want to contribute to the Platform project? - See here

MVP (ASP.NET) and ASPInsiders Member