WCF : Tuning WCF Service Performance and Default value for Throttling Settings

This blog will discuss how to tune WCF service performance under heavy load and explain the throttling settings.

Here is default value for each throttling setting as per msdn (wcf4.5 and higher version)

	Default Value	Single core -processor
MaxConcurrentCalls	16 * No of processor	16
MaxConcurrentInstances	MaxConcurrentCalls + MaxConcurrentInstances	116
MaxConcurrentSessions	100 * No of processor	100

In WCF , service throttling settings control the WCF service performance and server resource unitization, without knowing if you provide the highest value (INT MAX) to these setting, then service will be completed chocked.

We can achieve balance performance of service and controller resource usages by using following settings

• MaxConcurrentCalls: specify maximum number of message concurrently process by Service Host.
• MaxConcurrentInstances: specify the maximum number of instance object of service.
• MaxConcurrentSessions : specify the maximum number of sessions a ServiceHost object can accept

Web.config:

<serviceBehaviors>

        <behavior name="serviceBehavior">

          <serviceThrottling 

            maxConcurrentCalls="16"

             maxConcurrentInstances="116"

             maxConcurrentSessions ="100"

           />

         <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />

        </behavior>

      </serviceBehaviors>

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