wsHttpBinding to WCF Service hosted in IIS throughput issue - wcf

Question

I have a client application for load testing, which is used as payload generator. The application is a client to WCF service hosted in IIS with secure wsHttpBinding. In addition, the WCF service hosted in IIS is a middle tier which is also a client to another asynchronous WCF service hosted in Windows services using netTcpBinding.
While load testing I couldn't go beyond 10-12 requests per second. I have the right throttling configuration as shown below.
Here is my configuration for the application that is client to the service hosted in IIS
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.serviceModel>
<services>
<service behaviorConfiguration="ews.behavior" name="ServiceLoadTest.ProcessLoadRequest">
<endpoint address="" binding="netTcpBinding" bindingConfiguration="ews.search.netTcp" contract="ServiceLoadTest.IProcessLoadRequest" />
<endpoint address=""
binding="wsHttpBinding" bindingConfiguration="ews.wsHttp"
contract="EWSServiceLoadTest.IProcessLoadRequest" />
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="net.tcp://localhost:3300/load/" />
<add baseAddress="http://localhost:3301/load/" />
</baseAddresses>
</host>
</service>
</services>
<bindings>
<netTcpBinding>
<binding name="ews.search.netTcp" closeTimeout="00:05:00" openTimeout="00:10:00" receiveTimeout="00:10:00" sendTimeout="00:05:00" transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions" hostNameComparisonMode="StrongWildcard" listenBacklog="1000" maxBufferPoolSize="2147483647" maxBufferSize="2147483647" maxConnections="2000" maxReceivedMessageSize="2147483647">
<readerQuotas maxDepth="32767" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
<security mode="None" />
</binding>
<binding name="ews.netTcp">
<security mode="None" />
</binding>
</netTcpBinding>
<wsHttpBinding>
<binding name="WSHttpBinding_ISearchData" closeTimeout="00:05:00" openTimeout="00:05:00" receiveTimeout="00:05:00" sendTimeout="00:05:00"
maxBufferPoolSize="2147483647"
maxReceivedMessageSize="2147483647">
<readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647"
maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
<security mode="Transport">
<transport clientCredentialType="None" />
<message clientCredentialType="None" negotiateServiceCredential="false" />
</security>
</binding>
<binding name="ews.wsHttp" closeTimeout="00:05:00" openTimeout="00:05:00" receiveTimeout="00:05:00" sendTimeout="00:05:00"
maxBufferPoolSize="2147483647"
maxReceivedMessageSize="2147483647">
<readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647"
maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
<security mode="None" />
</binding>
</wsHttpBinding>
</bindings>
<client>
<endpoint address="https://[dnsName]/SearchData/Search.svc"
binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_ISearchData"
contract="SearchDataReference.ISearchData"
name="WSHttpBinding_ISearchData">
<identity>
<dns value="[dnsName]" />
</identity>
</endpoint>
</client>
<behaviors>
<serviceBehaviors>
<behavior name="ews.behavior">
<serviceDebug includeExceptionDetailInFaults="true"/>
<serviceMetadata httpGetEnabled="true" />
<serviceThrottling maxConcurrentCalls="5000" maxConcurrentSessions="5000" maxConcurrentInstances="5000"/>
<serviceTimeouts transactionTimeout="00:05:00" />
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
</configuration>
And here is web.config file for WCF service hosted in IIS
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.serviceModel>
<extensions>
<behaviorExtensions>
<add name="wsdlExtensions" type="WCFExtrasPlus.Wsdl.WsdlExtensionsConfig, WCFExtrasPlus" />
</behaviorExtensions>
</extensions>
<services>
<service behaviorConfiguration="ews.behavior" name="SearchData">
<endpoint address="" binding="wsHttpBinding" bindingConfiguration="ews.secure.wsHttp"
behaviorConfiguration="FlatWsdlBehaviour" contract="Contracts.ISearchData">
<identity>
<dns value="[dnsname]" />
</identity>
</endpoint>
<endpoint address="mex" binding="mexHttpsBinding" contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="https://[dnsname]/SearchData/Search.svc" />
</baseAddresses>
</host>
</service>
</services>
<behaviors>
<endpointBehaviors>
<behavior name="FlatWsdlBehaviour">
<wsdlExtensions location="https://[dnsname]/SearchData/Search.svc" singleFile="true" />
</behavior>
</endpointBehaviors>
<serviceBehaviors>
<behavior name="ews.behavior">
<serviceDebug includeExceptionDetailInFaults="true" />
<serviceMetadata httpsGetEnabled="true" />
<serviceThrottling maxConcurrentCalls="5000" maxConcurrentSessions="5000" maxConcurrentInstances="5000" />
<serviceTimeouts transactionTimeout="00:05:00" />
<dataContractSerializer maxItemsInObjectGraph="2147483647"/>
</behavior>
</serviceBehaviors>
</behaviors>
<bindings>
<netTcpBinding>
<binding name="NetTcpBinding_AllAsync" closeTimeout="00:10:00"
openTimeout="00:10:00" receiveTimeout="00:10:00" sendTimeout="00:10:00"
transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions"
hostNameComparisonMode="StrongWildcard" listenBacklog="5000"
maxBufferPoolSize="2147483647" maxBufferSize="2147483647" maxConnections="5000"
maxReceivedMessageSize="2147483647">
<readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647"
maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
<reliableSession ordered="true" inactivityTimeout="00:10:00"
enabled="false" />
<security mode="None">
</security>
</binding>
</netTcpBinding>
<wsHttpBinding>
<binding name="ews.secure.wsHttp" closeTimeout="00:05:00" openTimeout="00:05:00" receiveTimeout="00:05:00" sendTimeout="00:05:00"
maxBufferPoolSize="2147483647"
maxReceivedMessageSize="2147483647">
<readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647"
maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
<security mode="Transport">
<transport clientCredentialType="None" />
<message clientCredentialType="None" negotiateServiceCredential="false" />
</security>
</binding>
</wsHttpBinding>
<wsDualHttpBinding>
<binding name="WSDualHttpBinding_AllAsync" closeTimeout="00:10:00" openTimeout="00:10:00" receiveTimeout="00:10:00" sendTimeout="00:10:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true">
<readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="16384" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
<reliableSession ordered="true" inactivityTimeout="00:10:00" />
<security mode="None" />
</binding>
</wsDualHttpBinding>
</bindings>
<client>
<endpoint address="net.tcp://localhost:5536/NMVTISCheckForDataOnlineCallback"
binding="netTcpBinding" bindingConfiguration="NetTcpBinding_AllAsync"
contract="CheckForDataReference.IProcessCheckForDateOnlineAsync" name="NetTcpBinding_IProcessCheckDataOnlineAsync">
</endpoint>
<endpoint address="http://localhost:5525/NMVTISCheckForVinOnlineCallback"
binding="wsDualHttpBinding" bindingConfiguration="WSDualHttpBinding_AllAsync"
contract="CheckForDataReference.IProcessCheckForDataOnlineAsync" name="WSDualHttpBinding_IProcessCheckDataOnlineAsync">
</endpoint>
</client>
</system.serviceModel>
<runtime>
<gcServer enabled="true" />
</runtime>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
</startup>
</configuration>

Answer 1

In order to improve the performance of a IIS hosted WCF service, you may need to adjust the application pool settings. The following code snippet shows an example configuration setting:
<system.web>
<applicationPool maxConcurrentRequestsPerCPU="x" maxConcurrentThreadsPerCPU="x" requestQueueLimit="x"/>
</system.web>
Refer to the following MSDN page for additional information:
http://msdn.microsoft.com/en-us/library/ee377050.aspx