You get them via the ServiceThrottlingBehavior
class, The defaults are as follows
.NET 3.0/3.5
- MaxConcurrentSessions: 10
- MaxConcurrentCalls: 16
- MaxConcurrentInstances: 26
.NET 4.0+
- MaxConcurrentSessions: 100 * ProcessorCount
- MaxConcurrentCalls: 16 * ProcessorCount
- MaxConcurrentInstances: MaxConcurrentSessions + MaxConcurrentCalls
The thing you are most interested in is MaxConcurrentInstances
as that is what would consume a thread. Normally if you where to configure this you would set it up in your app.config file
<configuration>
<appSettings>
<!-- use appSetting to configure base address provided by host -->
<add key="baseAddress" value="http://localhost:8080/ServiceMetadata" />
</appSettings>
<system.serviceModel>
<services>
<service
name="Microsoft.WCF.Documentation.SampleService"
behaviorConfiguration="Throttled" >
<host>
<baseAddresses>
<add baseAddress="http://localhost:8080/SampleService"/>
</baseAddresses>
</host>
<endpoint
address=""
binding="wsHttpBinding"
contract="Microsoft.WCF.Documentation.ISampleService"
/>
<endpoint
address="mex"
binding="mexHttpBinding"
contract="IMetadataExchange"
/>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="Throttled">
<serviceThrottling
maxConcurrentCalls="1"
maxConcurrentSessions="1"
maxConcurrentInstances="1"
/>
<serviceMetadata
httpGetEnabled="true"
httpGetUrl=""
/>
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
</configuration>
Looking up via code is much more difficult to do (I could not figure out how, I normally just use configuration files)