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POSimulate Concurrent WCF Client Calls And Measure Response Time
 

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  1. POSimulate Concurrent WCF Client Calls And Measure Response Time
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    <p>I am trying to simulate X number of concurrent requests for a WCF Service and measure the response time for each request. I want to have all the requests hit the Service at more or less the same time. </p> <p>As the first step I spawned X number of Threads, using the Thread class, and have invoked the Start method. To synchronize all the requests, on the Thread callback I open the connection and have a Monitor.Wait to hold the request from being fired, till all the Threads are created and started. Once all the Threads are started, I call Monitor.PulseAll to trigger the method invocation on the WCF Client Proxy.</p> <p>When I execute the requests this way, I see a huge delay in the response. A request that should just a few milliseconds, is taking about a second.</p> <p>I also noticed huge lag between the time the request is dispatched and the time it was received at the service method. I measured this by send sending client time stamp as a parameter value to the service method for each request.</p> <p>I have the following settings. Assume "X" to the Concurrent number of requests I want to fire. Also note with the following settings I don't get any Denial of Service issues.</p> <ol> <li>The Call chain is as follows,Client->Service1->Service2->Service3</li> <li>All Services are PerCall with Concurrency set to Multiple. </li> <li>Throttling set to X Concurrent calls, X Concurrent Instances.</li> <li>MaxConnections, ListenBacklog on the Service to X.</li> <li>Min/Max Threads of ThreadPool set to X on both Client and Server (I have applied the patch provided by Microsoft).</li> </ol> <p>Am not sure if the response time I'm measuring is accurate. Am I missing something very trivial?</p> <p>Any inputs on this would be of great help.</p> <p>Thanks.</p> <p>-Krishnan</p>
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    1. COHave you tried it with X=1? Does the response delay change as you add threads?
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    2. COYes, it does. For X = 1, the response time is equal to the response I get when I execute the requests sequentially with no threads. And one more information. I use TCP Binding.
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