CODEWITHSUNDEEP
asp.net-mvciisiocpu
Rene K
Rene K

Reputation: 75

High CPU on IIS sites

I have a webserver with 10 mvc sites that I have created. All sites "link" to the same code in a folder. So all 10 sites run on same code. This is done have different languages on the site.

My problem is that 1 site goes up to use 40-60% of the CPU for a few minutes. Then it drops down and another sites rises in CPU. Normally the sites use 300mb in w3wp process, but sometimes rises to 8-900mb!

There's 20GB of memory, 18,9 is constantly used. There is also a SQL server running that takes 13GB.

The site is a MVC 3 site. Uses caching on the SQL data.

Every site has its own pool.

I know its a very vague question. But can anyone see any obvious problems with this setup?

Why does the CPU rise periodically?

There are about constantly 100-150 users on the sites.

Any ideas or thought would be very appreciated.

Upvotes: 4

Views: 3001

Answers (1)

manuel
manuel

Reputation: 1840

CPU utilization is result of web application so application developers would know best where is the problem. If application developers aren't "in-house" you as administrator will have to find is there problem in setup (less likely) or in application (more likely in my opinion).

Since IIS NEED tool from Microsoft like IIS Tracer, debugging high CPU utilization with "DebugDiag & friends" require lots of knowledge and effort.

Here is one nice article how to troubleshoot high CPU usage

Do your web apps use caching ?

OutputCache duration="180" varybyparam="*"

Sorry if this isn't helpful, but I'm administrator and when IIS server have high CPU usage in 95% problem is in poor SQL queries or bad programming which we fix after analyzing source code.

Upvotes: 3

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