Below is the code snippet for the same. ReadLine ; ServiceReference1. There are 2 important points to note:- By default the WCF service is configure to run with instance mode of per call. So new instances are created every time the service runs. Instance 1 indicate new instances created for every method call. By default the concurrency is single so same thread is use to service all the 5 request's which are sent from the WCF client side. You can see the value of the thread is always 4.
The most important factor is time. As the concurrency is configured as single it will be called one after another sequentially. You can notice the same from the time difference of method call of 5 seconds. Let's go and change the concurrency mode to multiple.
In order to change the concurrency mode to multiple we need to specify 'Multiple' in the concurrency mode as shown in the below code snippet.
If you run the client now you can see different threads i. In other words the methods are executed concurrently on different threads. In short you are now having higher throughput in less amount of time.
In the further coming section we will discuss in more detail about the same. Multiple threads for all clients. Single threads for all clients, locks are released when calls diverted to other WCF services.
PerSession Multiple instance per client Single thread for every client. Multiple threads for every request. PerCall Default Multiple instance for every method call Single thread for every client Single thread for every client.
We have already seen and example and demonstration of the same. The default concurrency is single so only one thread will be used to serve all instances. Below is a simple pictorial representation of what will happen in per call and single concurrency scenario:- For every client instance a single thread will be allocated.
For every method call a new service instance will be created. A single thread will be used to serve all WCF instances generated from a single client instance. If you refer the previous sample you can see how threads are same and the halt of 5 seconds on the WCF service. You can see in the below figure we have two WCF service instance and every instance has multiple WCF service objects created for every method call.
Every method call is handled by multiple threads. In the above sample if you remember we have multiple threads serving every method call and the time difference between every method call is reduced considerably. The method calls are fired approximately same time.
All the method calls are executed in a sequential manner one by one. In other words only one thread is available for all method calls for a particular service instance. If you run the sample code with the per session and single combination mode you will find the same thread executes all request with same WCF instance per session.
Below is the pictorial representation of the same. If you run the sample code attached with this article you will find same instance with every method call running on different methods. To get a better idea you can run with different client exe instance with different names as shown below.
You can notice how every client get his own WCF service instance with every method allocated to run on different threads. Quick access. Search related threads. Remove From My Forums. Answered by:. Archived Forums. Sign in to vote. User posted Hi, I wanted to know if WCF limits the concurrent connection from, let's say a web site that call's it.
This will not be the case. Case is customers will visit a web site that calls the WCF service. Wednesday, February 3, PM.
Throttling is an aspect of hosting and deployment. When you design a service, you should make no assumptions about throttling configuration—always assume your service will bear the full brunt of the client's load. This is why, although it is fairly easy to write a throttling behavior attribute, WCF does not offer one.
Administrators typically configure throttling in the config file. This enables you to throttle the same service code differently over time or across deployment sites.
The host can also programmatically configure throttling based on some runtime decisions. Example shows how to configure throttling in the host config file. Using the behaviorConfiguration tag, you add to your service a custom behavior that sets throttled values.
The host process can programmatically throttle the service based on some runtime parameters. You can only configure the throttle programmatically before the host is opened. Although the host can override the throttling behavior found in the config file by removing it and adding its own, you typically should provide a programmatic throttling behavior only when there is no throttling behavior in the config file. The service description, as its name implies, is a description of the service, with all its aspects and behaviors.
Example shows how to set the throttled behavior programmatically. First, the hosting code verifies that no service throttling behavior was provided in the config file. ServiceThrottlingBehavior is defined in the System. Design namespace:. If the returned throttle is null , then the hosting code creates a new ServiceThrottlingBehavior , sets its values, and adds it to the behaviors in the service description. Using C 3. ServiceThrottleHelper offers the SetThrottle method, which accepts the throttle to use, and a Boolean flag indicating whether or not to override the configured values, if present.
The default value using an overloaded version of SetThrottle is false. SetThrottle verifies that the host hasn't been opened yet using the State property of the CommunicationObject base class.
If it is required to override the configured throttle, SetThrottle removes it from the description. The rest of Example is similar to Example Service developers can read the throttle values at runtime, for diagnostic and analytical purposes. For a service instance to access its throttle properties from its dispatcher at runtime, it must first obtain a reference to the host from the operation context.
ChannelDispatchers is a strongly typed collection of ChannelDispatcherBase objects:. Each item in the collection is of the type ChannelDispatcher. ChannelDispatcher offers the property ServiceThrottle :.
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