When you set an application pool's Maximum Worker Processes attribute in IIS are you actually setting the number of processes or the number of threads?
These are processes (w3wp instances). Each process will have multiple threads.
ASP.NET Web Garden - How Many Worker Processes Do I Need?
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What is the intended usage of Worker Services in .net Core 3 with respect to threading. Is it expected that the need for multiple threads be handled as background threads within Workers or is there a pattern for adding multiple Workers (similar question) with in CreateHOstBuilder() and respected by all of its extension methods?
The title sums it up. Is there a limit of how many application pools a server's IIS can have?
The configuration system allows you to set many many more pools, but each pools' worker processes will consume system resources like CPU and memory. Thus, the final limit comes from the worker processes and that's determined by the sites, which vary in all possible ways.
I have been reading a lot about Node.JS and i'm with a doubt.
NodeJS is single thread but, let's say for example, IIS it isn't also single thread?
If my server has a CPU with one core shouldn't be single thread also? I read that the number of threads are relative to the number of CPU cores.
I ask that because I also read that in IIS we have one thread by connection. Is it possible?
Thanks for reading
In a general application, the number of threads is not bound by the number of cores. IIS may have an arbitrary number of threads on a single core CPU.
Javascript, Flash, and most other web applications are single threaded by the design of the Web Browser. This does not extend to the server though.
I have a doubt on IIS 6.0 worker process and Application pool.
I am having two web application which is been hosted on IIS 6.0 with different port number. Also I am created and assigned an Application pool to that applications. That application pool has configured for 2 worker process. Now what is my question is? when I am running that two applications from the browser, How that application pool will handle them? whether that two worker process will be assigned to one application or both.?
Please share your idea...
Thanks in Advance...
The worker processes are specific to each application pool. If you specify one application pool to have 1 worker process it will have only 1 worker process. If you specify another application pool to have 2 worker processes it will have 2 worker processes. You should notice that the properties screen is specific to an app pool.
You can see which application pools are using which worker processes using the following process;
• Start > Run > Cmd
• Go To Windows > System32
• Run cscript iisapp.vbs
• You will get the list of Running Worker ProcessID and the Application Pool Name.
You should see that if one of your app pools is set to use 2 worker processes it will have two entries in the list against the same app pool name.
Instructions and reference for above and also listing running worker processes in IIS7.
We use Kentico CMS and I've exchanged emails with them about a web garden deployment.
We have a single site running on a server with 8 cpu cores. In line with Kentico's advice, we have not altered the application pool web garden setting from the default i.e. it is set to a maximum number of worker processes of 1.
Our experience is that the site only uses one of the cpu cores - the others are idling. When I emailed them about this, their response was that the OS/IIS would handle this and use other cores as necessary even though the application pool only has a single worker process.
Now, I've a lot of respect for the guys at Kentico, but this doesn't seem right to me?
Surely, if we want to use all cores, we need to permit eight worker processes (and implement session state storage in SQL server)?
Many thanks
Tony
I would suggest running perfmon for a 24 hours and see if you can determine what resources are being used. Indeed they might already be running on all cores . . . Also, if their web app is a heavily threaded system, then it will take full advantage of multiple cores(at least ours does). Threads, not worker processes, are what actually count for processor utilization.
Not sure if you got an answer on ServerFault, at any rate ASP.NET is multi-threaded and in a single worker process there are several threads, each serving a single request.