Incredible CPU overload with W2K3/IIS6 and ASP.net

External Since: Oct 18, 2003 Posts: 1

Hello,

can't understand how works W2K3/II6 with ASP.net webpages. Here is my
story :

I work with a P4 2.4 GHz dedicated server with 1 GO RAM and 80 Go HD.
Just to say that my system is OK to serve webpages.

I began several weeks ago to notice that without no reason, my CPU was
100% overloaded. I see Windows Tasks Manager and notice an unknown
W3WP.exe process taking all CPU.

Now, my website is in production, and for no special reason, CPU goes
to 100% during a minute or two. Probably the worker process that do
something, but what ?!

So I decide to reconfigure IIS isolation mode, and check "Run WWW
service in IIS 5.0 isolation mode" checkbox.

What's the change ? Always an overloading, but instead of w3wp.exe
process, this is aspnet_wp.exe process that do the trip.

EVEN WHEN I STOP ALL MY WEBSITES, aspnet_wp.exe process makes my CPU
goes to 100% for several minutes after.

What's this ? I usually works with IIS5/W2K - ASP.net, and I have
never see such waste of CPU and time.

thank you for help !

Frederic

External Since: Aug 25, 2003 Posts: 54

Hey ~

The first thing - I do not recommend leaving your site in IIS 5 Isolation
Mode. However, the difference is significant when you change the process
model. I think you have done a good job of isolating the problem to ASP.net
since you have determined that the CPU spike is being caused by
aspnet_wp.exe. This process is only used in IIS 5 and IIS 5 Isolation Mode.
In IIS 6, ASP.net applications are run in the native IIS 6 worker process -
w3wp.

If you would like further proof this being in one of your ASP.net
applications - then prohibit ASP.Net applications in Web Services Extension.
This will of course kill ASP.Net on your server but should show that the
problem is 100 percent in your application.

Beyond that, I can only recommend looking closely at your ASP.net apps and
what they are doing...

Hope this helps,
~Chris (MSFT)
IIS Supportability Lead

"Frederic" <flottant75.TakeThisOut@ifrance.com> wrote in message
news:d84ffc13.0310180645.4c57067e@posting.google.com...
> Hello,
>
> can't understand how works W2K3/II6 with ASP.net webpages. Here is my
> story :
>
> I work with a P4 2.4 GHz dedicated server with 1 GO RAM and 80 Go HD.
> Just to say that my system is OK to serve webpages.
>
> I began several weeks ago to notice that without no reason, my CPU was
> 100% overloaded. I see Windows Tasks Manager and notice an unknown
> W3WP.exe process taking all CPU.
>
> Now, my website is in production, and for no special reason, CPU goes
> to 100% during a minute or two. Probably the worker process that do
> something, but what ?!
>
> So I decide to reconfigure IIS isolation mode, and check "Run WWW
> service in IIS 5.0 isolation mode" checkbox.
>
> What's the change ? Always an overloading, but instead of w3wp.exe
> process, this is aspnet_wp.exe process that do the trip.
>
> EVEN WHEN I STOP ALL MY WEBSITES, aspnet_wp.exe process makes my CPU
> goes to 100% for several minutes after.
>
> What's this ? I usually works with IIS5/W2K - ASP.net, and I have
> never see such waste of CPU and time.
>
> thank you for help !
>
> Frederic