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POC# WCF - Client/Server - System.OutOfMemory Exception
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copied!<h3>The Problem.</h3> <ul> <li>C# WCF Client/Server Application using Net TCP Binding (Publisher/Subscriber Pattern).</li> <li>Client-side keeps crashing with an <code>OutOfMemoryException</code>.</li> <li>When I run Task Manager along with the client, I can see the Memory Usage column increase until the application crashes.</li> <li>Intention is for multiple instances of the client to be running on separate machines.</li> </ul> <h3>Scenario</h3> <ul> <li>I have a client/server application.</li> <li>Publisher/Subscriber Design Pattern.</li> <li>On the server-side there are 6 dictionaries that make up a cache, each containing a custom object as a value.</li> <li>Each set of dictionary values gets updated every 5 seconds as part of a while loop.</li> <li>At the end of the 5 second loop, the 6 dictionaries are added to a datacontract object, each as a different data member.</li> <li>The data contract object is then sent over the wire to the client, where there are 6 more dictionaries.</li> <li>I then loop through each data contract dictionary, and either add to or update the contents of it's client-side equivalent, depending on whether the values already exist or not.</li> </ul> <h3>Summary</h3> <ul> <li>6 dictionaries server-side.</li> <li>6 serializable dictionaries in the data contract.</li> <li>6 bindable dictionaries client-side.</li> <li>WCF using Net TCP Binding to transport data over the wire.</li> </ul> <h3>Specification</h3> <ul> <li>C# .Net 3.5</li> <li>Client-side using one DevExpress form and 9 DX gridviews & tab controls.</li> <li>Most of the custom objects containg a dictionary of "sub assets". - I have used a bindable dictionary for this property, which I imagine creates overhead when you have a few hundred objects (although I don't think using a serializable dictionary instead would make much difference, as they both contain the same code for serialization).</li> <li><p>Bindings on both sides are programmatically created once at the start and contain the same settings (see below).</p> <pre><code>NetTcpBinding netTcpBinding = new NetTcpBinding(SecurityMode.None); EndpointAddress endpointAddress = new EndpointAddress(EndpoindAddress); InstanceContext context = new InstanceContext(callbackinstance); netTcpBinding.MaxConnections = 5; netTcpBinding.MaxBufferSize = 2147483647; netTcpBinding.MaxBufferPoolSize = 2147483647; netTcpBinding.MaxReceivedMessageSize = 2147483647; netTcpBinding.ReceiveTimeout = TimeSpan.MaxValue; netTcpBinding.CloseTimeout = TimeSpan.MaxValue; netTcpBinding.TransferMode = TransferMode.Buffered; netTcpBinding.ListenBacklog = 5; DuplexChannelFactory<ISubscription> channelFactory = new DuplexChannelFactory<ISubscription>( new InstanceContext(this), netTcpBinding, endpointAddress); proxy = channelFactory.CreateChannel(); </code></pre></li> </ul> <h3>My Questions</h3> <ul> <li>How can I prevent the client memory usage from growing constantly?</li> <li>Would the memory usage on the client be significantly lower if I sent only Generic Lists of objects as opposed to serializable dictionaries?</li> <li>Have I setup my binding configurations correctly for this kind of implementation?</li> <li>Any other suggestions for fixing this memory problem would be greatly appreciated.</li> </ul>

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