问题
I'm trying to find out why ASP.NET Development Server is not processing the requests concurrently.
So I've created a simple aspx page with the following code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
System.Threading.Thread.Sleep(10000)
End Sub
If I open the page two times, the response takes 20 seconds. That means, the server executes requests one by one (not concurrently).
Following advice provided in this topic, I've added EnableSessionState="false" to the page, but that doesn't seem to help.
Any ideas how to make the requests process concurrently?
回答1:
The asp.net dev server (cassini) cannot handle multiple threads. So it effectively processes requests one at a time. Turning session off really won't impact this.
It's really just for limited single user testing of a web app.
I'd recommend you dump cassini and install IIS Express or just go to the full IIS implementation.
A little reading: ASP.NET Dev Server (Cassini), IIS Express and multiple threads
回答2:
IIS on XP doesn't allow that many concurrent connections (I think it's 10). If you're developing in that environment, that may be why you're experiencing that (besides those 2 requests, you have requests for referenced files taking place, plus you may be issuing more requests than you think you are for that particular page).
I'm not sure if VS built-in server has similar limitations.
回答3:
If you're using ASP.NET MVC without disabling SessionState (which by default you would be) your requests will be automatially serialized - so if you're checking for race conditions with a random Thread.Sleep() value then Request B will never complete before Request A even if the time slept for is less.
ASP.NET MVC and Ajax, concurrent requests?
来源：https://stackoverflow.com/questions/9036150/asp-net-development-server-concurrent-processing-doesnt-work