How many concurrent requests can be executed in IIS 8.5?
I could not find proper values for how many concurrent requests can be executed in IIS 8.5
As I found out below 2 different values:
By default IIS 8.5 can handle 5000 concurrent requests as per MaxConcurrentRequestsPerCPU settings in aspnet.config
In machine.config, the maxconnection is 2 per CPU as default. So if have 6 core CPU then 12 concurrent requests are possible by default.
So I would like to know that Point 1 is right or Point 2 is right for concurrent requests for IIS 8.5.
Assuming that you are using ASP.NET application, the concurrent requests executed can vary based on the way the application code is written and the framework version you are using to run the application (2.0, 3.5, 4+ etc). Also you are confusing with max connect with concurrent requests. Both are two different things.
For more detailed understanding please read msdn blog ASP.NET Thread Usage on IIS 7.5, IIS 7.0, and IIS 6.0 .
To summarize
MaxConcurrentRequestsPerCPU in
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET\2.0.50727.0 determines the number of concurrent requests per CPU. By default, it does not exist and the number of requests per CPU is limited to 12
If your asp.net application is written entirely with asynchronous requests, the default MaxConcurrentReqeustsPerCPU limit of 12 is less and increase this setting MaxConcurrentRequestsPerCPU to a very high number.
In v4.0, the default for MaxConcurrentRequestsPerCPU to 5000
Maxconnection is the setting per HTTP protocol.Any application can only make two concurrent requests to any server.e.g. Your browser(IE 6,7) can make only two connection to your www.example.com. But for speed improvement ,many of the browsers currently make more than 6 simultaneous connections (vary in Chrome, Firefox and IE). Similarly when your server application make a request to a web service or a rest API, the client is your application and maxconnection enforces that for the same server (rest end point), you are allowed to make only two connections .
To increase maxconnection in an ASP.NET application, set
System.Net.ServicePointManager.DefaultConnectionLimit programatically,
from Application_Start, E.g. You can set this to Int32.MaxValue
Hope this helps!
According to this article there is also limitations when running on different Windows versions:
https://blogs.iis.net/owscott/windows-8-iis-8-concurrent-requests-limit
Max concurrent requests
Windows 8:
3 requests
Windows 8 Professional:
10 requests
Windows RT:
N/A since IIS does not run on Windows RT
I assumed (and tested on Windows 10 Home Edition) that on 8 and above this limitations still exists.
These 2 properties are not the same as I think you are implying they are.
MaxConcurrentRequestsPerCPU
Controls the number of incoming requests being handled per CPU
maxconnection
Controls the maximum number of outgoing HTTP connections that you can initiate from a client to a specific IP address.
Related
I am learning jmeter to check perform of the web application. This web application is hosted on IIS server and built in php. For testing we use windows 10 PC with 4GB RAM.
I am checking load testing with jmeter where I am sending 10 login request to IIS server with ramp-up periods 3 sec , IIS server stops responding and I have to restart IIS service. If I set ramp-up period 4 SEC then it is working fine.
I m expecting IIS should handle 10 request in 2 sec. For this what configuration should I change in IIS ?
My expectation is that you're hitting IIS concurrent connections limit:
Single JMeter virtual user can open up to 7 connections to the server when retrieving embedded resources so I think you can only do some functional testing using JMeter, but not the load testing.
If you want to identify the limits of your application and conduct some load testing you should consider upgrading to Windows Server operating system which doesn't have this limits.
Alternative solution is migrating from IIS to i.e. Apache which is capable of hosting PHP applications, in this case you will have much more concurrent connections allowed
Is there any setting in IIS 6 where we can limit number of parallel requests coming from specific host / machine.
I have noticed when a specific web service is invoked from specific server with parallel thread, it times out when parallel thread are more than 10., where as similar works fine when number of parallel thread is limited to 10.
Similar behavior is observed even if requests are coming via Load Balancer to server.
Thanks in anticipation
yes you can, have a look here:
https://learn.microsoft.com/en-us/iis/configuration/system.applicationhost/sites/sitedefaults/limits
The limits element replaces the following IIS 6.0 metabase settings:
ConnectionTimeout
MaxBandwidth
MaxConnections
you may also want to check out this article detailing the steps specifically for IIS6:
https://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/b2b550de-f655-4fb6-9bed-dfc9583b6700.mspx?mfr=true
How many user can enter a site at a time in IIS?
Say, the limit is 100.
Does it mean that 100 user each having various number of request can enter a site?
or
100 user each having a single request can enter a site?
or
100 request are allowed, doesn't matter whether they are from 100 user or not.
Total requests to the server so 100 users at one time.
Controls the number of simultaneous HTTP connections (and hence limits number of simultaneous connections serviceable by IIS6).
•On Windows Server 2003 RTM x86, this comes out to around 8,700
•On Windows Server 2003 SP1, the limit has been removed
•On Windows Server 2003 SP1 x64, since NPP is bound by available memory, you can increase concurrent connections by merely adding more RAM. To give a sense of scope - I have seen 50K+ concurrent connections to IIS6 on WS03SP1 x64 with 4GB RAM
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters
Type: DWORD
Value: Range from 0 to 2^32-1
Why do you have it set so low?
What IIS are you using?
I am trying to do some performance testing on an ASP.NET application where I suspect most of the stress is currently on the database. I want to test entire round trips with the system to find the bottle necks, so I am starting a test application to hit my web service that starts up multiple threads to simulate multiple clients. However, IIS (7 on windows 7) seems to have a default limit per client of 5 concurrent connections.
I know that this limit is there for good reasons (like preventing DOS attacks), but is there a way to bump this up for my testing environment?
I have a SOAP web service that is running on Windows 2008 R2, IIS7, ASP, and .net v2 framework. The service connects to a 32-bit dll that performs an operation that typically takes 15ms to complete. I have a requirement to manage 100 simultaneous requests per second originating from a single IP address.
Having followed many threads in this forum and the Microsoft site I have been able to tune my service to achive up to 50 simultaneous requests, using soap-ui and load-ui as a test harness.
I think that my only option is now to load balance several servers. Having read about load balancing and tried a virtual application from loadbalancers.org I'm not sure how to load balance the SOAP requests from a single IP, they only seem to balance based by IP address. Is this possible?
Regards, Mark.
If you have Windows Server with Network Load Balancing this is absolutely possible.
Check out http://technet.microsoft.com/en-us/library/cc725691.aspx for more information on it.
It should be standard with your server install.
There are other options but this will be your fastest and easiest since it seems you already have the necessary components.