WCF service is not multithreaded

Question

I am designing a WCF service used by a WPF application. The service will be used by 50 customers and will be hosted on a multi-core server. That is why I would like it to be multithreaded.

Here's how I announced it:

[ServiceContract(
    SessionMode = SessionMode.Required,
    Namespace = Constants.NameSpace,
    CallbackContract = typeof (ISaphirServiceCallback))]
public interface ISaphirService


[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, 
                InstanceContextMode=InstanceContextMode.PerSession)]
public partial class SaphirService : ISaphirService

And the server side configuration:

  <system.serviceModel>
    <bindings>
      <netTcpBinding>
        <binding name="NewBinding0" receiveTimeout="00:59:00" sendTimeout="00:59:00" maxReceivedMessageSize="2147483647" maxBufferPoolSize="20000000">
          <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
          <reliableSession ordered="true" inactivityTimeout="00:30:00" enabled="true"/>
          <security mode="Message">
            <message clientCredentialType="UserName" />
          </security>
        </binding>
      </netTcpBinding>

      <customBinding>
        <binding name="ServicePECB2ServiceBinding">
          <textMessageEncoding messageVersion="Soap12WSAddressing10" />
          <httpsTransport />
        </binding>
      </customBinding>
    </bindings>
    <client>
      <endpoint address="https://qualiflps.services-ps.ameli.fr/lps" binding="customBinding" bindingConfiguration="ServicePECB2ServiceBinding" contract="ServiceReference1.ServicePECB2Service" name="ServicePECB2Service" />
    </client>

    <behaviors>
      <serviceBehaviors>
        <behavior name="NewBehavior0">
          <serviceThrottling maxConcurrentCalls="50" maxConcurrentSessions="50" maxConcurrentInstances="50"/>
          <serviceAuthorization serviceAuthorizationManagerType="Service.Authorizations.AuthorizationPolicy, Service">
            <authorizationPolicies>
              <add policyType="Service.Authorizations.AuthorizationPolicy, Service" />
            </authorizationPolicies>
          </serviceAuthorization>
          <serviceMetadata httpGetEnabled="true" httpGetUrl="http://127.0.0.1:80/Service" />
          <serviceDebug includeExceptionDetailInFaults="true" />
          <serviceCredentials>
            <serviceCertificate storeLocation="CurrentUser" storeName="TrustedPeople" x509FindType="FindBySubjectName" findValue="*****" />
            <userNameAuthentication userNamePasswordValidationMode="Custom" customUserNamePasswordValidatorType="Service.Authorizations.CustomValidator, Service" />
          </serviceCredentials>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <services>
      <service behaviorConfiguration="NewBehavior0" name="Service.Services.SaphirService">
        <endpoint address="basic" binding="netTcpBinding" bindingConfiguration="NewBinding0" contract="ServiceInterfaces.IServices.ISaphirService">
          <identity>
            <dns value="*****" />
          </identity>
        </endpoint>
      </service>
    </services>
  </system.serviceModel>

And here is the client side configuration:

  <system.serviceModel>
    <bindings>
      <netTcpBinding>
        <binding name="NetTcpBinding_ISaphirService" receiveTimeout="00:30:00" sendTimeout="00:05:00" maxReceivedMessageSize="2147483647" maxBufferPoolSize="20000000">
          <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
          <reliableSession ordered="true" inactivityTimeout="00:30:00" enabled="true"/>
          <security mode="Message">
            <message clientCredentialType="UserName" />
          </security>
        </binding>
      </netTcpBinding>
    </bindings>
    <client>
      <endpoint address="http://****:4224/service/basic" binding="netTcpBinding" bindingConfiguration="NetTcpBinding_ISaphirService" contract="ISaphirService" name="NetTcpBinding_ISaphirService" behaviorConfiguration="CustomBehavior">
        <identity>
          <certificate encodedValue="****" />
        </identity>
      </endpoint>
    </client>
    <behaviors>
      <endpointBehaviors>
        <behavior name="CustomBehavior">
          <clientCredentials>
            <serviceCertificate>
              <authentication certificateValidationMode="PeerOrChainTrust" />
            </serviceCertificate>
          </clientCredentials>
        </behavior>
      </endpointBehaviors>
    </behaviors>
  </system.serviceModel>

The fact is that each request is processed in the same topic. I checked a lot on the Internet, but everything seems good to me ...

Do you have any ideas?

Thank!

Answer 1

ServiceHost WCF SynchronizationContext . WPF Dispatcher, .

:

• , . : , . , :

  Task.Run(() => serviceHost.Open());
  

• , :

  [ServiceBehavior(UseSynchronizationContext = false)]
  

: , .

Answer 2

, , InstanceContextMode=InstanceContextMode.PerSession. InstanceContextMode=InstanceContextMode.PerCall.