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8: Smart Client Application Performance
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Another decision you will face is how to design and work with network services, such as Web services. In particular, you should consider the granularity, synchronicity, and frequency of interaction with network services. For the best performance and scalability, you should send more data in a single call rather than send smaller amounts of data in several calls. For example, if your application allows users to enter multiple items in a purchase order, it is better to collect data for all items, and then to send the completed purchase order to the service at one time, rather than send individual item details in multiple calls. In addition to reducing the overhead associated with making many network calls, this also reduces the need for complex state management within the service and/or the client. Your smart client applications should be designed to use asynchronous communication whenever possible, as this will help to keep the user interface responsive and execute tasks in parallel. For more information on how to initiate calls and retrieve data asynchronously using BeginInvoke and EndInvoke methods see, Asynchronous Programming Overview (http://msdn.microsoft.com/library /default.asp url=/library/en-us/cpguide/html/cpovrasynchronousprogrammingoverview.asp).
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Note: For more information on designing and building smart client applications that are occasionally connected to the network, see 3, Getting Connected and 4, Occasionally Connected Smart Clients.
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Using multiple threads within your application can be a good way to increase its responsiveness and performance. In particular, you should consider using threads to carry out processing that can safely be done in the background and that does not require user interaction. Performing such work in the background allows the user to continue working with the application and allows the application s main user-interface thread to maintain the application s responsiveness. Good candidates for processing that can be done on a separate thread include: Application Initialization. Perform lengthy initialization on a background thread so that the user is able to interact with your application as soon as possible, especially if an important or major part of the application functionality does not depend on this initialization completing. Remote Service Calls. Make all remote calls over the network on a separate background thread. It is difficult if not impossible to guarantee response times for services located on the network. Performing these calls on a separate thread reduces the risk of network outages or slowdowns adversely affecting application performance.
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IO Bound Processing. Processing, such as searching and sorting data on disk, should be done on a separate thread. Typically, this kind of work is subject to the constraints of the disk I/O sub-system, and not processor availability, so your application can effectively maintain its responsiveness while this work is carried out in the background.
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While the performance benefits of using multiple threads can be significant, it is important to note that threads consume resources of their own and using too many threads can create a burden on the processor, which needs to manage context switching between threads. To prevent this, consider using a thread pool instead of creating and managing your own threads. Thread pools will efficiently manage the threads for you, reusing existing thread objects and minimizing the overhead associated with thread creation and disposal. If the user experience is impacted by work performed by background threads, you should always keep the user informed of the progress of the work. Providing feedback in this way enhances the user s perception of the performance of your application and prevents him or her from assuming that nothing is happening. Try to ensure that the user can cancel lengthy operations at any time. You should also consider using the Idle event of the Application object to perform simple operations. The Idle event provides a simple alternative to using separate threads for background processing. This event fires when the application has no more user interface messages to handle and is about to enter the idle state. You can perform simple operations with this event and take advantage of user inactivity. For example: [C#]
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public Form1() { InitializeComponent(); Application.Idle += new EventHandler( OnApplicationIdle ); } private void OnApplicationIdle( object sender, EventArgs e ) { }
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