Specifies the throttling mechanism of a Windows Communication Foundation (WCF) service.
<serviceThrottling maxConcurrentCalls="Integer" maxConcurrentInstances="Integer" maxConcurrentSessions="Integer" />
The following sections describe attributes, child elements, and parent elements.
|maxConcurrentCalls||A positive integer that limits the number of messages that currently process across a ServiceHost. Calls in excess of the limit are queued. Setting this value to 0 is equivalent to setting it to Int32.MaxValue. The default is 16 * processor count.|
|maxConcurrentInstances||A positive integer that limits the number of InstanceContext objects that execute at one time across a ServiceHost. Requests to create additional instances are queued and complete when a slot below the limit becomes available. The default is the sum of maxConcurrentSessions and MaxConcurrentCalls|
|maxConcurrentSessions||A positive integer that limits the number of sessions a ServiceHost object can accept.|
The service will accept connections in excess of the limit, but only the channels below the limit are active (messages are read from the channel). Setting this value to 0 is equivalent to setting it to Int32.MaxValue. The default is 100 * processor count.
|<behavior>||Specifies a behavior element.|
Throttling controls place limits on the number of concurrent calls, instances, or sessions to prevent over-consumption of resources.
A trace is written every time the value of attributes is reached. The first trace is written as a warning.
The following configuration example specifies that the service limits the maximum concurrent calls to 2, and the maximum number of concurrent instances to 10. For a detailed example of running this example, see Throttling.
<behaviors> <serviceBehaviors> <behavior name="CalculatorServiceBehavior"> <serviceDebug includeExceptionDetailInFaults="False" /> <serviceMetadata httpGetEnabled="True"/> <!-- Specify throttling behavior --> <serviceThrottling maxConcurrentCalls="2" maxConcurrentInstances="10"/> </behavior> </serviceBehaviors> </behaviors>