How prevent CPU usage 100 because of worker process in iis

Question

My CPU usage is 100  most of the the time in Windows Server 2008-R2 with my own vps  vmware  quad core  and 4GB Ram  When I open windows Task Manager and go to the resource monitor I see that 100  usage is because of workerprocess exe   I have 3 websites in my IIS      How can I figure out which web site causes that usage How can I limit it to 80  usage of CPU    Could it be a DDOS attack    Is there any way to prevent DDOS      I installed eset-nod32 on my vps  but it doesn t show any attack in the logs   I ve tried searching about IIS and preventing DDOS  and just found an extension for banning IP addresses  but how can I find which IP address are generating traffic     The web site is written in ASP NET and C   How can I determine what is happening on that web site and which lines of codes are causing that cpu usage   Also  one of my web sites should access administrator s desktop and read and write some files   So because of that I changed its application pool -  identity  Process Model  to local system  and I don t know if it is related with the CPU usage or not

User · Accepted Answer

Well  this can take long time to figure out  Few points to narrow it down    Identify what is killing the CPU  I recommend Process Explorer http   technet microsoft com en-us sysinternals bb896653 aspx Identify what AppPool is causing this Fix your code

User · Answer

I was facing the same issues recently and found a solution which worked for me and reduced the memory consumption level upto a great extent   Solution   First of all find the application which is causing heavy memory usage   You can find this in the Details section of the Task Manager   Next    Open the IIS manager  Click on Application Pools  You ll find many application pools which your system is using  Now from the task manager you ve found which application is causing the heavy memory consumption  There would be multiple options for that and you need to select the one which is having  1  in it s Application column of your web application  When you click on the application pool on the right hand side you ll see an option Advance settings under Edit Application pools  Go to Advanced Settings  5 Now under General category set the Enable 32-bit Applications to True Restart the IIS server or you can see the consumption goes down in performance section of your Task Manager    If this solution works for you please add a comment so that I can know

User · Answer

Diagnosing  In terms of diagnosing what App Pool is causing trouble  you can    Select the server Go to IIS   Worker Processes     This should bring up a menu like this so you can determine which App Pool is running amok     From there you can simply restart the the app pool and 9 times out of 10 that will fix any immediate issues you re having   Treating  Unless you run some sort of controversial business  this is probably not a DDOS attack   It s likely that some code is just hanging because it couldn t get through to another server or got stuck in a loop or mis-allocated resources or your app pool just hasn t been recycled in a while   You can deal with this problem programmatically without having to manually identify  log in  and recycle the app pool   Just configure the CPU property on your App Pool   You can have it kill  and automatically restart  your process  anytime you reach a CPU threshold for a certain amount of time     In your case  if you want it to restart at 80   you can right click on the app pool and go to Advanced Settings and apply the following configurations     NOTE  As kraken101 pointed out  different IIS GUIs have treated this differently over time   While the config value is always in 1 1000 of a    sometimes the GUI takes the whole percent   You can add this to your config section like this    lt applicationPools gt      lt add name  DefaultAppPool  gt        lt cpu limit  80000  action  KillW3wp  resetInterval  00 01 00    gt      lt  add gt   lt  applicationPools gt    Alternatively  you could script it with Powershell s WebAdministration Module like this    make sure web-scripting-tools is enabled   Import-Module WebAdministration   appPoolName    DefaultAppPool   appPool   Get-Item  IIS  AppPools  appPoolName   appPool cpu limit   80000  appPool cpu action    KillW3wp   appPool cpu resetInterval    00 01 00   appPool   Set-Item   Preventing  The steps above will help fix some things once they ve broken  but won t really solve any underlying issues you have   Here are some resources on doing performance monitoring    Troubleshooting High CPU in an IIS 7 x Application Pool MSDN - Performance Tuning and Monitoring IIS Extension - Web Performance Monitor Troubleshooting Failed Requests Using Tracing PerfMonitor Log Parser

User · Answer

I recently had this problem myself  and once I determined which AppPool was causing the problem  the only way to resolve the issue was remove that app pool completly and create a new one for the site to use

User · Answer

There are a lot of reasons that you can be seeing w3wp exe high CPU usage   I have selected six common causes to cover    High error rates within your ASP NET web application Increase in web traffic causing high CPU Problems with application dependencies Garbage collection Requests getting blocked or hung somewhere in the ASP NET pipeline Inefficient  NET code that needs to be optimized

User · Answer

If it is not necessary turn off  Enable 32-bit Applications  from your respective application pool of your website   This worked for me on my local machine

User · Answer

Use PerfMon to collect data and DebugDiag to analyse   Found this link while searching for similar issue    http   www iis net learn troubleshoot performance-issues troubleshooting-high-cpu-in-an-iis-7x-application-pool

User · Answer

Use procmon to define your problem

[asp.net] How prevent CPU usage 100% because of worker process in iis

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