Has anyone looked at using application initialization for IIS 7.5? It's part of IIS 8.0 but is also available for IIS 7.5 as a download - more information here:

http://forums.iis.net/t/1176740.aspx

The article for 8.0 describes the features in detail and applies to the version for IIS 7.5:

http://www.iis.net/downloads/microsoft/application-initialization

I'd be interested in hearing if anyone has it working successfully for a DotNetNuke.web site.

The point of App Initialization isn't to keep your app warm. (Further, keepalive.aspx is unnecessary for self hosters with IIS 8.5. You can just disable sleep timeout.)

The purpose of App Initialization is to eliminate the cold-start time if your app has to recycle for any number of reasons. It keeps your old app running until it's finished spinning up a new app.

Lot's of things in DNN can require an app to recycle, like memory leaks, cpu's that are spiking, just a scheduled app restart. etc.

So far I'm having an issue with App Initialization.

2013-12-15 11:47:02,472 [App1][Thread:24][FATAL] DotNetNuke.Web.Common.Internal.DotNetNukeHttpApplication - System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at DotNetNuke.Professional.Providers.OutputCachingProviders.FileProvider.FileProvider.GetCacheFolder(Int32 portalId)
at DotNetNuke.Professional.Providers.OutputCachingProviders.FileProvider.FileProvider.StreamOutput(Int32 tabId, String cacheKey, HttpContext context)
at DotNetNuke.Professional.HttpModules.OutputCache.OutputCacheModule.OnResolveRequestCache(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

This doesn't happen every time, but for every few app restarts it's throwing this error for the first few seconds of the new app being active.

DNN never supported multiple worker processes for an application pool (Web Garden), even in Web Farm configuration.
This sounds like you are trying to implement something comparable.

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Cheers from Germany,
Sebastian Leupold

   

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