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POWCF. What is the performance difference between async and sync methods on a service?
 

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  1. POWCF. What is the performance difference between async and sync methods on a service?
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    <p>lets assume that we have two operation contracts defined on wcf service, sync and async one. There are two samples:</p> <pre><code>public void SubscribeSingle(int userId) { var clientId = this.OperationContext.GetClientId(); var session = this.OperationContext.GetPollingDuplexSession(); if (string.IsNullOrEmpty(clientId) || session == null || userId == 0) { return; } this.InternalSubscribeSingle(userId, clientId, session.SessionId); } </code></pre> <p>and </p> <pre><code>public IAsyncResult BeginUnsubscribeSingle(int userId, AsyncCallback callback, object state) { var clientId = this.OperationContext.GetClientId(); var session = this.OperationContext.GetPollingDuplexSession(); if (string.IsNullOrEmpty(clientId) || session == null) { return null; } var asyncResult = new VoidAsyncResult(callback, state); Task.Factory.StartNew(() =&gt; { try { this.InternalUnsubscribeSingle(userId, clientId); asyncResult.SetAsCompleted(false); } catch (Exception ex) { asyncResult.SetAsCompleted(ex, false); } }); return asyncResult; } public void EndUnsubscribeSingle(IAsyncResult result) { var response = result as VoidAsyncResult; if (response != null) { response.EndInvoke(); } } </code></pre> <p>As I understand WCF service also has a thread pool inside, so each I/O operation may be finished on another thread. As well as starting new thread using Task.Factory.StartNew</p> <p>Is there any difference between sync and async server calls from performance point of view, if database access is made through EntityFramework and though blocking?</p>
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    1. COFYI Stephen Toub has an article about performance implications of asynchrony using the Task-based Asynchrony Pattern in this month's MSDN magazine. You can read it here: http://msdn.microsoft.com/en-us/magazine/hh456402.aspx
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