45 lines
2.2 KiB
HTML
45 lines
2.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<META http-equiv="Content-Type" content="text/html; charset=utf-8">
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<LINK rel="stylesheet" type="text/css" href="../../../rzahg/ic.css">
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<title>Performance overview</title>
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</head>
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<BODY>
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<!-- Java sync-link -->
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<SCRIPT LANGUAGE="Javascript" SRC="../../../rzahg/synch.js" TYPE="text/javascript"></SCRIPT>
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<h3><a name="prfover"></a>Performance overview</h3>
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<p>Performance is the measure of time and resources that are required to complete a task. Because of the variety of resources involved, performance tuning for Web-based applications is more complex than tuning most other applications.</p>
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<p>To understand performance management, you need to know these basic performance concepts:</p>
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<ul>
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<li><strong>Throughput</strong> is the number of client requests that the application server environment can process at a given time.</li>
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<li><strong>Response time</strong> is the elapsed time that it takes for the application server to process a client request.</li>
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<li><strong>Load</strong> is the amount of resources, such as main storage, processor, and I/O support, that are required by the application to process all client requests at a given time.</li>
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</ul>
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<p>Application server performance is determined primarily by these components:</p>
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<ul>
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<li><strong>Hardware resources</strong> such as system configuration, memory pools, and subsystems</li>
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<li><strong>Web environment configuration</strong> such as garbage collection, request queuing, and data caching</li>
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<li><strong>Application design and implementation</strong> such as object creation, connection pooling, and data access configuration</li>
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</ul>
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<p>See these topics for more information about performance and the resources that are available to help you optimize performance:</p>
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<blockquote>
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<p><strong><a href="prfguide.htm">Performance guidelines</a></strong>
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<br>This topic provides general guidelines that can help you ensure optimal performance.</p>
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<p><strong><a href="prfref.htm">Performance resources</a></strong>
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<br>This topic provides links to additional references and tools that can help you optimize performance.</p>
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</blockquote>
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</body>
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</html>
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