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POWCF Performance Question
 

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    <p>I'm pretty much new at WCF and have a performance question. I have the following code that is executing at the client:</p> <pre><code> try { for (int i = 0; i &lt; 20; i++) { stopwatch.Reset(); stopwatch.Start(); var psn = client.GetPsnByPsnId(21); var psnList = client.GetPsnBySmartBizClientId(2); var container = client.GetContainerByContainerId(3); var containerList = client.GetContainerBySmartBizClientId(2); stopwatch.Stop(); Console.WriteLine(string.Format("Pass # {0} completed in {1} milliseconds", i + 1,stopwatch.ElapsedMilliseconds)); } } catch (FaultException exception) { MessageBox.Show(string.Format("Error occurred. The error message is {0}", exception.Message)); } finally { client.Close(); client = null; } </code></pre> <p>This code hits a WCF service that is hosted as a Windows service using HTTP binding under .NET 4.0. The problem I have is this. The very first time through the loop, on the very first WCF call (client.GetPsnByPsnID()), there is a very significant delay, 10+ seconds in fact. But, after this first call, each subsequent call, each time through the loop, takes &lt; 1 second, as I would expect. I'm sure this is a WCF issue because if I call the first method outside of WCF, I get &lt; 1 second performance.</p> <p>Anyone have any idea what might be causing the initial delay?</p> <p>EDIT: Here is the OnStart code for the Windows Service:</p> <pre><code>protected override void OnStart(string[] args) { serviceHost = new ServiceHost(typeof(ServiceMethods),new Uri("http://111.111.111.111:1111/Psn")); // Add an endpoint and the methods the endpoint will support. serviceHost.AddServiceEndpoint(typeof(IServiceMethods), WcfConfiguration.GenerateBinding(Enumerations.WcfBindingType.HTTP), ""); WcfConfiguration.CreateMexData(serviceHost); serviceHost.Open(); } </code></pre> <p>And here is the GenerateBinding method:</p> <pre><code>public static System.ServiceModel.Channels.Binding GenerateBinding(Enumerations.WcfBindingType bindingType) { System.ServiceModel.Channels.Binding binding = null; BasicHttpBinding httpBinding = new BasicHttpBinding(); httpBinding.Security.Mode = ((bindingType == Enumerations.WcfBindingType.HTTP) ? BasicHttpSecurityMode.None : BasicHttpSecurityMode.Transport); httpBinding.OpenTimeout = new TimeSpan(0, 0, 30); httpBinding.SendTimeout = new TimeSpan(0, 0, 30); httpBinding.ReceiveTimeout = new TimeSpan(0, 0, 30); httpBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None; httpBinding.ReaderQuotas.MaxStringContentLength = httpBinding.ReaderQuotas.MaxStringContentLength; httpBinding.MaxReceivedMessageSize = httpBinding.MaxReceivedMessageSize; httpBinding.ReaderQuotas.MaxArrayLength = 1048576; httpBinding.MaxBufferSize = httpBinding.MaxBufferSize; binding = httpBinding; break; } return binding; } public static void CreateMexData(ServiceHost host) { ServiceMetadataBehavior behavior = new ServiceMetadataBehavior(); behavior.HttpGetEnabled = true; host.Description.Behaviors.Add(behavior); host.AddServiceEndpoint(typeof(IMetadataExchange), MetadataExchangeBindings.CreateMexHttpBinding(), "mex"); } </code></pre>
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    1. COIs there a significant code in `OnStart` method to your service and / or WCF host?
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    2. COIs your service transactional, by any chance?
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    3. CO@mellamokb - I've added the OnStart code.
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