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    <p>Per Microsoft docs: </p> <blockquote> <p>The use of concurrency is related to the instancing mode. In PerCall instancing, concurrency is not relevant, because each message is processed by a new service instance.</p> </blockquote> <pre><code>// Multiple allows concurrent processing of multiple messages by a service instance. // The service implementation should be thread-safe. This can be used to increase throughput. [ServiceBehavior(ConcurrencyMode=ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.Single)] // Uses Thread.Sleep to vary the execution time of each operation. public class CalculatorService : ICalculatorConcurrency { int operationCount; public double Add(double n1, double n2) { operationCount++; System.Threading.Thread.Sleep(180); return n1 + n2; } public double Subtract(double n1, double n2) { operationCount++; System.Threading.Thread.Sleep(100); return n1 - n2; } public double Multiply(double n1, double n2) { operationCount++; System.Threading.Thread.Sleep(150); return n1 * n2; } public double Divide(double n1, double n2) { operationCount++; System.Threading.Thread.Sleep(120); return n1 / n2; } public string GetConcurrencyMode() { // Return the ConcurrencyMode of the service. ServiceHost host = (ServiceHost)OperationContext.Current.Host; ServiceBehaviorAttribute behavior = host.Description.Behaviors.Find&lt;ServiceBehaviorAttribute&gt;(); return behavior.ConcurrencyMode.ToString(); } public int GetOperationCount() { // Return the number of operations. return operationCount; } } </code></pre> <p>Sample output: (number in [] indicates thread id)</p> <pre><code>2012-07-31 09:07:28,509 [9] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Leaving: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double, double) : 752.919376325402 2012-07-31 09:07:28,512 [17] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Leaving: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double, double) : 752.919376325402 2012-07-31 09:07:28,524 [13] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Leaving: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double, double) : 2143.10173334651 2012-07-31 09:07:28,524 [11] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Entering: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double n1 = 15.5665354410031, double n2 = 48.3678194919451) 2012-07-31 09:07:28,532 [22] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Entering: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double n1 = 94.7194438868758, double n2 = 29.8120223590229) 2012-07-31 09:07:28,534 [9] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Entering: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double n1 = 99.2045067247024, double n2 = 88.4957458770349) 2012-07-31 09:07:28,539 [4] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Entering: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double n1 = 99.2045067247024, double n2 = 88.4957458770349) 2012-07-31 09:07:28,539 [7] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Entering: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double n1 = 37.991849630136, double n2 = 41.7864370820049) 2012-07-31 09:07:28,539 [17] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Entering: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double n1 = 11.331077670367, double n2 = 55.5888338273339) 2012-07-31 09:07:28,539 [11] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Leaving: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double, double) : 752.919376325402 2012-07-31 09:07:28,539 [22] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Leaving: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double, double) : 2823.77817898976 2012-07-31 09:07:28,539 [17] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Leaving: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double, double) : 629.881393702645 2012-07-31 09:07:28,542 [9] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Leaving: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double, double) : 8779.17681696586 2012-07-31 09:07:28,544 [4] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Leaving: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double, double) : 8779.17681696586 2012-07-31 09:07:28,544 [7] DEBUG Microsoft.ServiceModel.Samples.CalculatorService - Leaving: Microsoft.ServiceModel.Samples.CalculatorService.Multiply(double, double) : 1587.54403419867 </code></pre>
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    1. POSelf-hosted WCF service: ConcurrencyMode.Multiple but only using one thread?
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    1. COI really do wish it were that simple. I have tried every configuration of those atts and nothing seems to make a difference. Only one thread gets used.
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    2. COI am not sure if it the use of the third party DLL that is only making use of the one thread.
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    3. COWell, your service is not thread-safe to start with. You have a racing condition in InitialiseThirdParty. I will test the sample code if I can get multiple threads to spawn. What is your testing method? How do you know you only have one thread?
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