Iis - Web Garden - Max Worker Threads?
Oct 5, 2010
I'm investigating some performance improvements that can be made to our web server and ASP.NET application.This page contains a few things that we can do.We currently have two worker processes running as a garden. Do each of these worker processes have their own ASP.NET threadpool? Or do both of these worker processes share a single threadpool and the max number of worker threads is shared across these processes?This post seems to suggest that the two processes share a common ASP.NET threadpool. All w3wp.exe threads do is take requests from HTTP.SYS queue, process it, and hand the request toASPNET_ISAPI.DLL, who then deposits those requests into the ASP.Net request queue, and the ASP.Net threadsBut this post suggests that each worker process contains their own ASP.NET threadpool. Each process (w3wp.exe) has its own CLR thread pool which has the configured maxworkerthreads value (20 default).
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Nov 1, 2010
I'm currently trying to interface our new intranet (ASP-MVC) with the web front end of our pager system. The pager system's front end is about 10 years old, poor interface and no documentation. To do this I have the form on the intranet post to the server, our server then sends an HTTP POST to the pager server that mimics what its own form sends.
While testing this for overloading (we sent about 10 messages almost concurrently) the pager server crashed, as the system is a black box and the only difference we noticed was the concurrent POSTs the least we can do is try to prevent this happening.I want to have all messages go into a queue that sends at most once every 5-10 seconds but I'm not sure how to implement this,
I didn't specify this earlier but the process should be synchronous from the point of view of the browser, ie webserver gets the http POST request from the browser, message is put into the queue, message is sent from the queue, webserver sends http response to the browser. This is not a high volume service and I expect simultaneous requests to be rare so response will be near instantaneous, it is more of a throttle to prevent potential issues with concurrent requests.
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Sep 8, 2010
since asp.net contains multiple threads that are executing at the same time.so if 2 threads access an object (simple or complex) that i got from the the asp.net httpcontext Cache.can't this lead to state problems on that object if these 2 theads tried to modify/read it at the same time?so what kind of precautions should i implement?for example i am thinking maybe locking the object while working with it? (wont this cause performance problems?)or maybe when i retrieve some object from the cache i should create a copy from it?
or maybe i dont need to worry about this issue at all?
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Jul 6, 2010
Web farm is used for multiple request and multiple user using switching among them.
Web Garden creates worker processes for every processor individually for one user.
Is it possible to use worker process as a switch and convert it into Web Farm that can allocate multiple processor on bases of algorithm?
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Mar 23, 2011
difference between the Web Farm and Web Garden with some real time scenario?
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May 23, 2010
I have a lot of Singleton implementation in asp.net application and want to move my application to IIS Web Garden environment for some performance reasons.
CMIIW, moving to IIS Web Garden with n worker process, there will be one singleton object created in each worker process, which make it not a single object anymore because n > 1.
can I make all those singleton objects, singleton again in IIS Web Garden?
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May 17, 2010
When do you need IIS Web Garden feature. What's pro's and con's?
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Nov 10, 2010
I have a simple question but I still a bit confused after googling. The situation is like this. I have ASP.NET deployed in a Web Server, and had set to a Web Garden and IIS Worker Process is more than 1. So I would like to ask, is it all worker processes running under same Application Domain? Or can said Web Garden running under same Application Domain?
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Mar 22, 2011
Does ASP.NET provide any sort of out-of-process cache server, similar to the way the session server works? If not, what would you recommend for caching in a Web Garden scenario?
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Jan 13, 2011
I just stumbled across the concept of a "Web Garden" in an IIS App Pool. That is, when more than one process serves the same webpage. From what I understand, this means ASP.NET InProc sessions have the same problems as a web farm.
My question is, assuming your production environment is a web farm but your development/test environment is not, would it be to set up a "Web Garden" in dev/test? I'm thinking this would help catch any multi-process/server issues early on, or at least confirm that everything works as expected.
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Jan 6, 2011
I built a little web application that displays charts. I was thinking that it might be useful for the superuser of the app to do a complete data refresh, however this process takes around 10 minutes to complete. I was thinking perhaps the user could click a button that would start off a new thread to do a data refresh and subsequent clicks would kill the thread and restart the data population process. The user would then be free to browse about the site and view the charts as their data is populated.
Is there a simple method of accomplishing something like this?
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Aug 20, 2010
I'm trying to get a better handle on how threads work in ASP.NET, so I have a test site with a few pages, and I have a test WinForms client that creates 40 roughly concurrent requests to the test site. The requests take about 5-10 seconds to complete--they call a web service on another server. When I run the test client, I can use Fiddler to see that the requests are being made concurrently. However, when I look at Performance Monitor on the web server, with counters "ASP.NET Apps v2.0.xxx/Requests Executing", "ASP.NET/Requests Current", "ASP.NET Requests Queued", these counters never display more than 2.
This is the case regardless of whether the test page I'm requesting is set up with Async=True and using the Begin/End pattern of calling the web service, or if it's set up to make the call synchronously. Judging by what I see in Fiddler, I would think I should be seeing a total of 40 requests in one of those states, but I don't. Why is that? Do these counters not mean what I think they mean?
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Nov 1, 2010
In the main thread I open a new thread that gets the number of new messages of user (takes about 5 secs) and this second thread should save the number in some place.
In the main thread I should check the "some place" and if the value exists I display it on the page.
Where can I save the value from the second thread to read it from the main one? This value is unique per user so I can't use static field.
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Feb 21, 2011
I have a method that I call 8 times with different parametres.I use
AvailableYears.AsParallel()
.Select<Int32,DateUsedByThread>(x => GetDataForYearWorker(x,CIF))
.ToList();
GetDataForYearWorker gets the response from a webservice synchronously. It uses very little computing power on my asp.net application, but it ussualy takes 3-5 sec for each webservice response. Because the calls to the webservice are independent of eachother, I want to make tham all at the same time. But it looks like only 2 threads can run at the same time. Why is this and how can I have 8 threads working at the same time?
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Feb 27, 2011
I am trying to reproduce a threading error condition within an HTTP Handler.
Basically, the ASP.net worker procecss is creating 2 threads which invoke the HTTP handler in my application simultaneously when a certain page loads.
Inside the http handler, is a resource which is not thread safe. Hence, when the 2 threads try to access it simultaneously an exception occurs.
I could potentially, put a lock statement around the resource, however I want to make sure that it is infact the case. So I wanted to create the situation in a console application first.
But i cant get 2 threads to execute a method at the same time like asp.net wp does. So, my question is how can you can create 2 threads which can execute a method at the same time.
Edit:
The underlying resource is a sql database with a user table (has a name column only). Here is a sample code i tried.
[TestClass]
public class UnitTest1
{
[TestMethod]
public void Linq2SqlThreadSafetyTest()
[Code]....
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Mar 5, 2011
I'm using ASP.NET 4.0 on IIS7.5 and WCF Callback technique. I have no problem with callback. The wcf service can fire callback method in web client but it seems it's on another thread with the UI thread.
public partial class _Default : System.Web.UI.Page, IServiceCallback
{
private IService proxy = null;
private static TextBox _textBoxtest;
protected void Page_Load(object sender, EventArgs e)
[Code]....
how to update my textBox from callback event.
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Feb 15, 2011
When my asp.net page loads,it needs to get data from 2 webservices.I want to make the data retrieval processes work concurently.How can I do this and update Label1 with the text result from WS1 and label2 with the result from WS2?I don't know how the code should look like in order to be able to update the controls on the page.
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Apr 11, 2010
Do I have to lock access to instance members?
public class HttpModule : IHttpModule
{
//...
Dictionary<int, int> foo;
void UseFoo(int a, int b)
{
foo[a] = b;
}
}
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Jun 15, 2010
When I do ThreadPool.QueueUserWorkItem, I don't want unhandled exceptions to kill my entire process. So I do something like:
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try { FunctionIActuallyWantToCall(); }
catch { HandleException(); }
});
Is this the recommended pattern? It seems like there should be a simpler way to do this. It's in an asp.net-mvc app, if that's relevant.
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Dec 20, 2010
I have a web application hosted in IIS 7.5 and expose its functionality using web services. The web application has state the the first thing I do is to call a web service method to start it all up. As a consequence several threads are created and these threads run until the system is stopped. All recycling of application pools and such is disabled! To access the web services the calling client must authenticate (using basic auth and local windows users). Thus, an incoming request has the CurrentPrincipal set. The logging subsystem is setup to tag all log messages with the current principals identity name and this works just fine for code that runs on an the thread of on incoming request. But, it doesn't work at all for all of my background threads. The current principal is still set in these threads but the identity objects name has been disposed. Why is this? What can I do to fix this. I would really like to get all log messages tagged with the current principal. It also seems impossible to detect if the identity name instance has been disposed without trying to access it and catch the exception which is highly annoying.
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Jan 5, 2010
I had the following code to send different mails to differnt users in my asp.net web application
foreach (DataRow dataRow in dataTable.Rows)
{
sendMails();
[code]...
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Mar 1, 2011
ASP.NET 2.0
We have an old app we are moving to a new server and the dates are screwing up (we are in England dd/MM/yyyy) on an assynchronous thread.
Googling it appears that each thread needs to be set to a specific culture otherwise it defaults to the 'OS default locale'. We don't want to change the code so looks like we need to change the os default locale.
Just to be completely clear - does a new thread in asp.net default to the app.config setting (no), machine.config settings (?), app pool account settings (Network Service in our case), Local Service or the Local System account locale settings? Can the default be changed through the Administration tab in regional setting (WS2008)?
Second question, when looking at Environment.UserName, it is showing the server name (xxxx$) rather than Network Service (which is running the app pool). Why is this?
Also, do we need to worry about Input Language, or just Format (locale)?
Is it possible for the Welcome Page to be showing as English (United Kingdom) but the system accounts to actually be English (United States)?
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Sep 13, 2010
I've got a thread that sends emails around. I need to generate ActionLinks as part of the content of the email so the user can click on the link and be redirected to the website, exactly to the required page. I tried to instantiate a UrlHelper class and use it's Action method to generate the link but since threads don't run within the context of any request I get exceptions at the time of generating the ActionLink.
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Jan 29, 2011
I'm currently reading a lot about node.js. There is a frequent comparison between servers using a traditional thread per request model (Apache), and servers that use an event loop (Nginx, node, Tornado).
I would like to learn in detail about how a request is processed in ASP.NET - from the point it is received in http.sys all the way up to it being processed in ASP.NET itself. I've found the MSDN documentation on http.sys and IIS a little lacking, but perhaps my google-fu is weak today. So far, the best resource I have found is a post on Thomas Marquardt's Blog.
Could anyone shed more light on the topic, or point me to any other resources?
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Dec 7, 2010
After an IISRESET on my public facing webserver, the initialization of my app seems correct. That is, in the Application_Start event I launch a new "email" thread whose purpose is to sleep until the configured time, upon "waking" produce a report and email it to my administrative user(s) and go back to sleep until the configured duration elapses at which time, the report is created again and emailed out. I am currently configured to start at 1900 and produce a new report every 12 hours.
As time marches on with this production site, however, something is causing an "extra" thread to be created. This, in turn, results in a duplicate report being emailed. While the problem is benign enough, I'd like to clean this up if possible. Here's a snippet:
[code]....
The above code seems to work fine (like I stated, after an IISRESET, I see the one logged event from the Application_Start event followed by the log entry from my "email" thread: "EmailThread will sleep for nnn minutes...etc.". But somehow (over time) I am getting another instance of the EmailThread thus producing 2 reports instead of just one at the scheduled "wake time".
In the IIS application pool assigned to this website, I have the following settings:
- Recycle worker processes (in minutes) is UNCHECKED
- Recycle worker process (number of requests) is UNCHECKED
- Recycle worker process (at various times) is UNCHECKED / nothing specified
- [Idle timeout] Shutdown worker process after being idle for (time in minutes) is UNCHECKED
I have noticed that the Application_Start event can be entered again (in one case roughly 38 minutes after the first time) which causes my code to run again and create another [and unwanted] thread.
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