RadUpload taking up lot of memory in IIS7.5 integrated mode

[Mike]

Hi,

I have a website on DNN 6.2.6 and telerik version 2013.2.717.40. We very recently moved the website to windows 2008 R2 (IIS7.5) from IIS6 on windows 2003 server. We are currently running the application pool in integrated mode in .net 4.0 with 32 bit enabled.  We are seeing huge spike in the memory whenever we are loading huge files using RadUpload control. We allow files upto 2GB to be uploaded, with 1.5GB file we are getting OutofMemoryExceptions. I monitored the memory usage, the instant I click submit button on my page, the memory is spiked by the approximately same size as the file I am uploading, this is happening even before the file barely started uploading. I understand that the RadUpload is replaced with RadAsyncUpload, this module is built 4 years ago and in the future we will move to that control but we need the issue to be resolved with RadUpload until we do so. 

I read through the http://www.telerik.com/help/aspnet-ajax/upload-getting-started.html and added the changes to web.config:

<system.webserver>
<modules>
. . .
<add name="RadUploadModule" type="Telerik.Web.UI.RadUploadHttpModule, Telerik.Web.UI" preCondition="integratedMode"/>
</modules>
<handlers>
. . .
<add name="Telerik_RadUploadProgressHandler_ashx" path="Telerik.RadUploadProgressHandler.ashx" verb="*" type="Telerik.Web.UI.Upload.RadUploadProgressHandler, Telerik.Web.UI" preCondition="integratedMode"/>
</handlers>
</system.webserver>

In the modules section preCondition used to be mangedHandler and I changed it to integratedMode. The way the upload is being used is as follows:   

<telerik:RadUpload ID="_newFileFileUpload" runat="server" OnClientFileSelected="CheckIfZip" MaxFileInputsCount="1"
                    ControlObjectsVisibility="None" Width="300px" />

Any idea why the issue is happening.

Thank you,
dana

[Peter Filipov]

Hi Mike,

The RadUpload control uses the standard input type='file' element and the upload is handled by the ASP.NET framework. We only find the uploaded file from the submitted form and provide an API layer over it. When a file is uploaded it is stored and handled by the framework, a process which is black box for us. To overcome this problem you should send the file on chunks which the RadAsyncUpload does(2MB each).

Regards,
Peter Filipov
Telerik