Re: Poor ISAPI performance in comparison to ASP.NET

From: Egbert Nierop \(MVP for IIS\) (egbert_nierop_at_nospam.invalid)
Date: 10/01/04 

Date: Fri, 1 Oct 2004 10:53:10 +0200

"Ben Rush" <kwendex@yahoo.com> wrote in message
news:OrLzhqzpEHA.896@TK2MSFTNGP12.phx.gbl...
> Wade,
>
> Thanks for your quick response; I appreciate you MS guys monitoring these
> groups.
>
> What I found today was actually quite interesting - it appears that when I
> run my ISAPI extension out of proc, IIS
> runs multiple threads through it. Using the Win32 ::GetCurrentThreadId()
> and ::OutputDebugString, I'm able to see multiple threads passing through
> the code of my ISAPI when its out of proc. However, when in proc there
> appears to be only ONE thread ever used, and the
> ConnID value of the ISAPI context structure is always the same (I assume
> this is due to the same thread). ASP.NET employs its own thread-pooling
> mechanism (I've seen this via empircal tests and
> AppDomain.GetCurrentThreadID()).
>
> In summary, it looks as though the performance hit I'm seeing is a result
> of a single thread of execution hitting my inproc DLL. Would
> an ATL Server solve this? Currently I just created a DLL and exported the

Yes, ATL server makes it more easy to create thread pools and such. A plain
ISAPI filter, runs without threadpools and without caching. 

-- 
compatible web farm Session replacement for Asp and Asp.Net
http://www.nieropwebconsult.nl/asp_session_manager.htm
> necessary functions - I see a lot of work has gone into ATL Server
> in the latest release of Visual Studio. I also see from reading online it 
> performs its own thread-pooling and I can only assume that, since its ATL, 
> it's
> pretty fast.....
>

Relevant Pages

  • Re: Poor ISAPI performance in comparison to ASP.NET
    ... threads that enter your ISAPI when you are running OOP are actually RPC ... I am not at all familiar with ATL server, ... > the code of my ISAPI when its out of proc. ... >> reason for this is that ASP.NET is highly optimized and has substantial ...
    (microsoft.public.inetserver.iis)
  • Creating a COM object crashes IIS
    ... I am now migrating it to a ISAPI ATL Server. ... My problem is that IIS craches when I try to create the COM object. ... I had to put my application code in a separate dll called by the ISAPI ...
    (microsoft.public.dotnet.framework.webservices)
  • Re: Poor ISAPI performance in comparison to ASP.NET
    ... Thanks for your quick response; I appreciate you MS guys monitoring these ... the code of my ISAPI when its out of proc. ... a single thread of execution hitting my inproc DLL. ... necessary functions - I see a lot of work has gone into ATL Server ...
    (microsoft.public.inetserver.iis)
  • Keep Socket connection open in ATL Server (ISAPI)
    ... I created an ISAPI application using ATL Server. ... I would like to keep the connection open from session to session. ... This way will work if I could somehow prevent the DLL from unloaded by IIS. ...
    (microsoft.public.vc.atl)
  • Poor ISAPI performance in comparison to ASP.NET
    ... over to ISAPI; but the counters I'm getting back show ISAPI is behaving very ... out of proc, the ASP.NET solution runs about 1.3 x faster than ISAPI. ... simply a console-mode app using WinINET. ...
    (microsoft.public.inetserver.iis)