In IIS 8. Internet Information Services IIS on Windows Server provides the administrator with the option of timing out a worker process that is idle for a specified period of time. This is a good option for sites that are not accessed very often because it frees up system resources when the site is idle.
The disadvantage is that the next time the site is accessed, the user will need to wait for the worker process to start again. A suspended worker process remains alive but is paged-out to disk, reducing the system resources it consumes. When a user accesses the site again, the worker process wakes up from suspension and is quickly available. When an idle worker process is terminated, the worker process is shut down, and the startup period will be longer when the site is subsequently accessed.
Terminating the process is the default behavior, and the same behavior that has been used in previous versions of IIS prior to IIS 8. The idleTimeoutAction attribute can be configured either for a single application pool or as a default for all application pools.
You can view suspended worker processes in Task Manager and see that they use very little memory or CPU. The idleTimeoutAction configuration can be entered in two places in the applicationHost. In this guide, you have configured IIS to suspend or terminate worker processes that have been idle for a specified amount of time.
Skip to main content. Exit focus mode. IIS 8. Problem Internet Information Services IIS on Windows Server provides the administrator with the option of timing out a worker process that is idle for a specified period of time.
Solution In IIS 8. Select Applications Pools in the Connections pane, select an application pool in the Application Pool pane, and then click Advanced Settings In the Advanced Settings dialog box, under Process Modelselect Suspend for the value of Idle Time-out Action to suspend a worker process when the time-out value is reached, paging it out to disk.
Select Terminate to shut down the worker process. Optionally set the Idle Time-out value from the default 20 minutes to a different time period. Click OK. In the Application Pool Defaults dialog box, under Process Modelselect Suspend for the value of Idle Time-out Action to suspend a worker process when the time-out value is reached, paging it out to disk. This is what is happening for DefaultAppPool in the screenshot of applicationHost.
If idleTimeoutAction is not set for a specific pool, e. NET v4. If idleTimeoutAction is set for a pool, that setting overrides the default. Summary In this guide, you have configured IIS to suspend or terminate worker processes that have been idle for a specified amount of time. Related Articles Is this page helpful? Yes No. Any additional feedback? Skip Submit.A simple way to preserve system property is to set-up idle time-out settings for the worker protocols in an application pool.
When you configure these settings, a worker system will shut down after a particular length of time of the system going into the inactive mode.
The preset time for idle time-out is 20 minutes. This section of the guide provides information regarding the levels at which you can carry out this operation, and the modules, handlers, and permissions that are needed to perform this action. This article provides you with all the information you need and the steps you must take to configure application pools.
The essential modules and handlers ought to be installed on the Web server and enabled at the level where you carry out the process. Be aware that you can enable Modules at only the Web server, site, and application levels.
However, you can enable handlers at all levels. If you carry out these operations with the use of Appcmd.
You can create an application pool with the use of the user interface UI. You can as well do it by running Appcmd. Alternatively, you can create it by editing configuration files straight-on, or through WMI scripts. To do this, navigate to the.
NET Framework your managed apps, modules, and handlers need. Alternatively, choose No Managed Code. This is particularly useful; when the apps you run within this specific application pool do not need the.
NET structure. Navigate to the list on the Managed pipeline modechoose one the options presented below:. NET request- processing channel. NET request-processing modes differently. Straight after choosing your option, click on the Start application poo l to launch the application pool anytime the WWW service is initiated.
Recycle is a forced action on the application where your processed is closed and started again, for memory leaking purposes and system health. The negative impact of both is usually the use of your Session and Application state is lost if you mess with Recycle to a faster time. The positive would be get rid of the idle time out as your website will respond faster on its "first" response if its not a highly active site where a user would have to wait for it to load if you have 1 user every 20 minutes lets say.
So a website that get his less then 1 time in 20 minutes actually you would want to increase this value as the website has to load up again from scratch for each user. From here :. One way to conserve system resources is to configure idle time-out settings for the worker processes in an application pool.
When these settings are configured, a worker process will shut down after a specified period of inactivity. The default value for idle time-out is 20 minutes. Also check Why is the IIS default app pool recycle set to minutes? If you have a just a few sites on your server and you want them to always load fast then set this to zero. Otherwise, when you have 20 minutes without any traffic then the app pool will terminate so that it can start up again on the next visit.
The problem is that the first visit to an app pool needs to create a new w3wp. NET or another framework needs to be loaded, and then your application needs to be loaded. That can take a few seconds. Suspending is just freezes the process and it is much more efficient than the destroying the process.
The web services also have to be able to run timed processes, independently without having the client on. Hence they all have timers.
The web service timers were shutting down memory leak? Learn more. Asked 6 years, 5 months ago. Active 2 years ago.
Viewed 98k times. What are the negative implications of settings them to 0?A kernel-mode web driver http. Worker processes register for URL subspaces, and http. The request can be served from the HTTP. Multiple worker processes can be configured, which provides isolation at a reduced cost. For more info on how request handling works, see the following figure:. When a request matches an entry in the response cache, HTTP.
Some web application platforms, such as ASP. NET, provide mechanisms to enable any dynamic content to be cached in the kernel-mode cache.
Subscribe to RSS
Because a web server has kernel-mode and user-mode components, both components must be tuned for optimal performance. Performance-related HTTP. All registry settings are stored under the following registry entry:. One benefit that HTTP.
If the response is in the kernel-mode cache, you can satisfy an HTTP request entirely from the kernel mode, which significantly lowers the CPU cost of handling the request.
An entry in the cache is helpful only when it is used. However, the entry always consumes physical memory, whether or not the entry is being used.
Idle Worker Process Page-Out in IIS 8.5
You must evaluate the usefulness of an item in the cache the savings from being able to serve it from the cache and its cost the physical memory occupied over the lifetime of the entry by considering the available resources CPU and physical memory and the workload requirements. A non-zero value enables the kernel-mode response and fragment caching. For most workloads, the cache should remain enabled. Consider disabling the cache if you expect a very low response and fragment caching.
A non-zero value that specifies the maximum memory that is available to the kernel-mode cache. The default value, 0, enables the system to automatically adjust how much memory is available to the cache. Note Specifying the size sets only the maximum, and the system might not let the cache grow to the maximum set size. The maximum size of an entry in the kernel-mode cache. Responses or fragments larger than this are not cached.Problem: Asp Net Core 2 hangs. Restart on IIS
If you have enough memory, consider increasing the limit. If memory is limited and large entries are crowding out smaller ones, it might be helpful to lower the limit.
The HTTP. Setting the scavenger period to a high value reduces the number of scavenger scans. However, the cache memory usage might increase because older, less frequently accessed entries can remain in the cache. Setting the period too low causes more frequent scavenger scans, and it can result in too many flushes and cache churn.
Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up.
I'm currently fighting an issue with ASP. Net taking minutes to load a page for the first time. Through playing with settings I've found that disabling "Shutdown worker processes after being idle for time in minutes " stops the issue from occurring I assume the reason it stops my issue from occurring is due to the fact the worker process does not end and therefor the app pool never needs to recreate itself.
I highly recommend turning off the idle timeout in most situations. It's the default but it's meant more for bulk hosters that want unused worker processes to be ended so that they can always assume that they won't have all of them running at the same time. However, if you have just a few production app pools on a server but occasionally don't have a visitor in a 20 minute space i.
You likely have enough resources to have all of your app pools running at once. Additionally the default settings of recycling the app pool at minutes should also be changed. I recommend scheduling it for an off-peak time like am daily rather than having it at different times each day. More on that here on my website. My understanding is that if you don't kill idle worker processes after a period of time, you will have tons of unused worker processes eating up memory.
I guess you can try it and see if you notice a gradual increase in memory. There is another setting that does a recycle every minutes or something, so that would clear out really old worker processes. BTW The way we handle this with lesser-used websites is that our monitoring software loads an aspx page every 10 minutes. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Is there any harm in disabling the idle timeout for an application pool?
Ask Question. Asked 10 years, 9 months ago. Active 1 year, 9 months ago. Viewed 57k times.
Is there any harm in disabling this option? What ramifications could it have? Active Oldest Votes. Glorfindel 1, 2 2 gold badges 10 10 silver badges 20 20 bronze badges. This setting is best left enabled for: leaky applications servers with lots of application pools There isn't much danger of being overwhelmed with app pools if you've only got a few defined.
Other than that, I've disabled it in many cases, with no ill effect. M Aguilar M Aguilar 5 5 silver badges 5 5 bronze badges. Adam Brand Adam Brand 5, 2 2 gold badges 25 25 silver badges 39 39 bronze badges.
Thanks for the info, I'll keep an eye on the memory. What monitoring software do you use? According to this link bradkingsley. Sign up or log in Sign up using Google. Sign up using Facebook.IIS hosts millions of websites around the world. Thanks to IIS Manager, it is easy to create and manage websites. Websites use default functional and performance settings which are efficient most of the time.
However, you may want to fine-tune IIS performance for specific applications and cases. In this post, I will explain 8 recommendations that potentially improves IIS performance. Most of the recommendations are compatible with IIS 7. I will mention the exceptions in their respective section.
IIS has kernel-mode and user-mode components. Kernel-mode components receive and route HTTP requests, manage connections, and send responses back to clients. User-mode components process the requests and prepares responses. There is a response cache for both kernel-mode and user-mode levels.
Using cache allows IIS to handle requests faster. However, the consumption of the physical memory increases as the cached entries occupy space in the memory. It is recommended to monitor the memory usage and limit the maximum amount memory that can be used by cache. Requests can be satisfied entirely by using this cache. Enabling kernel-mode cache speeds up page load time, reduces bandwidth usage and the amount of data transfer, and decreases the server load which significantly lowers the CPU cost of handling the requests.
Some features such as authentication and authorization cannot be served by using Output Caching. In user-mode level, requests are handled in containers worker processes which provides more security and manageability. Follow the steps below to enable Output Caching. These steps will enable both kernel-mode and user-mode caching. This is a feature in IIS that manages what happens when an application is started for the first time.
The startup process affects the speed of the website for the users who hit the website for the first time after a deployment, server restart, IIS reset, application pool restart or application pool idle time. For large applications, the startup time could be high because the website compiles the code, initiates caching, loads components, and generate files. Note: The steps below apply to IIS 7.
IIS 7. IIS uses modules to process requests in the integrated pipeline. One of these modules is the Default Document Module. It handles the requests that go to the root of a directory for an application.
This can negatively affect the IIS performance. By reducing and reordering the list of default documents, the application response time can be increased. While editing the list, make sure to have only the default documents that are used by that particular application. Additionally, make sure that the list begins with the most frequently accessed default document name. When a client visits a webpage, the browser makes multiple requests to download the entire page.
In order to load the page, the browser may initiate separate connections for each element such as images. When a client visits a webpage for the first time, the request is processed by the web server and a response is sent through network.
If caching is set up, the client will use its own cache to visit the website which significantly improves the response time.
It also improves the server performance as the request is not served by the server. The cache-control is an HTTP header. In addition to the client machines, this header is also used CDNs, load balancers, and proxies.
I setup ASP. NET 4. I basically followed those instructions. I used remote access and verified that those two properties are correctly set through IIS Manager, as well as checking the applicationHost. This page says the Idle Timeout should be disabled when auto-start is enabled.
Yet, I can see from my log that it is not, the application pool gets restarted after some inactivity. I can also see that in the event log several times over 6 hours :. A worker process with process id of '' serving application pool 'cf9dbbf-8a8e-efd73df4ed83' was shutdown due to inactivity. Application Pool timeout configuration was set to 20 minutes. A new worker process will be started when needed. The strange thing is that it seems a new application pool is started immediately after this is logged, even if there is no request to the website.
So if I don't get a single request in one hour, the application pool is recycled and restarted 3 times I confirmed this from the logs. Is my configuration incorrect or am I missing something? Setting the Start Mode to Always Running alone didn't work for me either but setting the Idle Timeout to 0 in the application pool's Advances settings did.
I did everything i could to keep my services alive in IIS but eventually got tired and had to take different approach. I created a windows service just to keep those app pool alive.
One approach you can try is go to IIS config file and verify that you can see the configuration you made is reflected in that config file. Refer to the link on top.
But your configuration will be reset on app pool restart whatever time you set it to go to sleep. You might need to comeup with some approach. Learn more.