Question

What is the the max no. of requests that an asp.net application can handle by default?

Asked by: DasDirector

What is the the maximum number of requests that an asp.net application can handle by default on a Windows Server 2003 workstation? Is it 20? Is there a max limit to which it can be increased or it is only dictated by the physical limit for your machine?

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Asked On
2009-01-12 at 13:40:18ID24045677
Tags

asp.net worker process httpapplication

Topics

Programming for ASP.NET

,

Microsoft Visual C#.Net

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Answers

 

by: WB-InternalPosted on 2009-01-12 at 13:47:35ID: 23357790

Windows Server 2003 workstation???  it's one or the other, well actually it's 2003 server or it's something else, there is no 2003 workstation. (well unless you consider Vista as such which i don't)

Server has no connection limits to IIS.
Connection limits are manually done as a performance tuning feature.

http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/b2b550de-f655-4fb6-9bed-dfc9583b6700.mspx?mfr=true

 

by: DasDirectorPosted on 2009-01-12 at 15:35:39ID: 23358673

I am talking about a Windows server 2003.  

What I read is that the HttpApplicationFactory class creates a pool of HttpApplication objects for ASP.NET applications and hands out references for each incoming request. The size of the pool is limited to the setting of the MaxWorkerThreads setting in machine.configs ProcessModel Key, which by default is 20 . So does that mean that ASP.NET in this scenario can handle a max of 20 requests simultaneously?

Also, is it true that because Windows XP is not a server platform, the number of simultaneous connections is limited to 10?

 

by: deanvanrooyenPosted on 2009-01-12 at 15:44:25ID: 23358711

dude,

my site speed team had a target of 1000 simultaneous'ish connections. site had about 20 apps running within the site.

 

by: deanvanrooyenPosted on 2009-01-12 at 15:46:43ID: 23358725

ps. 20+ asp.net apps, :. depends on architecture and hardware, why - you starting the next myspace?

 

by: DasDirectorPosted on 2009-01-12 at 16:13:36ID: 23358859

I am concerned about how many requests can be simultaneously handled by an asp.net worker process. I think that it would depend on the max threads available in the asp.net thread pool, so if the pools has only 20 threads the other (if > 20) requests are queued. Is that right?

Please see - http://msdn.microsoft.com/en-us/library/aa480507.aspx

As per Microsoft the threadpool count in ASP.NET 2.0 is set to 100 worker thread (processModel setting in machine.config). So does it imply that in this case no more than 100 requests are handled simultaneosly? Which I think is a reasonable limit since most requests in a well written application are handled in a few 10s of ms.

Can some one comment. Thanks.

 

 

by: dusionPosted on 2009-01-12 at 20:28:38ID: 23360033

An ASP.net app doesn't really refuse requests, since it cues them. If you are using Windows 2003(IIS6) then you will not max out you simultanious connections, and get an error screen like with XP.

The worker pool basically processes however many tasks you set it to, the default being 20, and ques the rest untill some of the others complete.  Technically the thread count is only limited by the machine, but i wouldn't set it to more than 100 or so threads on what I call a standard web server(4gb ram, 4 xeon quad core procs) about 20 or 30 per physical proc. And also with that number you probably want to have your database housed on a seperate server. Also like you said most requests are handled in 10ms to 70ms even if you qued a thousand or more requests, which is normal, then you will only notice a few seconds of difference in time till till tasks get processed.

Another thing to think about is if you could compute every page in you website in 50ms and you recieved a request every 100ms 1/10 second then you would only process 1 request per second. You may want to take a look here. http://www.campbellassociates.ca/blog/PermaLink,guid,d71f658b-d4eb-4498-af42-35977b42fb35.aspx

Also, It is true that Windows XP Pro (IIS5.1) is limited to 10 simultanious connections and Windows XP Home is limited to 5, because XP is not considered a server platform and in my opinion should only be used by a developer for personal testing before uploading to a development server for actual/group testing. XP is also limited to a single website.

Hope this helps,
Dustin

 

by: dusionPosted on 2009-01-12 at 20:31:35ID: 23360041

Sorry this:
then you would only process 1 request per second.
Should read: then you would only process 1 request simultaniously

20120131-EE-VQP-002

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