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48 lines
2.4 KiB
HTML
48 lines
2.4 KiB
HTML
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<!DOCTYPE html>
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<html>
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<title>Chatty Help</title>
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<link rel="stylesheet" type="text/css" href="style.css" />
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<body>
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<div id="backlink"><a href="help.html">Back to main help page</a></div>
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<h1><a name="top">Memory Usage</a></h1>
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<p>
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<a href="#restrict">Restrict Memory Usage</a> |
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<a href="#error">OutOfMemoryError</a>
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</p>
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<p>The programs memory is managed by Java, which means Java allocates a
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certain amount of memory which is then filled up with data of the program
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and once Java decides so, it cleans up data that is not used anymore
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(Garbage Collection). This leads to the actual memory usage going up and
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down constantly, while the allocated memory mostly stays the same. So
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even if only 50 MB are filled with data by the program <em>at the time</em>, Java may
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still have 200 MB reserved to optimize Gargabe Collection. Thus, the memory usage in e.g. the Task Manager
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may not reflect what the program actually <em>requires</em>, just how
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much Java uses.</p>
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<p>Use the <code>/appinfo</code> command in Chatty to get some information
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about the current memory usage.</p>
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<p>A typical memory usage pattern, which can change over time as the program
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is running while Java optimizes Gargabe Collection:<br />
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<img src="jconsole.jpg" alt="Typical memory usage pattern" /></p>
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<h2><a name="restrict">Restrict Memory Usage</a></h2>
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<p>You can <a href="http://stackoverflow.com/questions/1493913/how-to-set-the-maximum-memory-usage-for-jvm">restrict</a> how much memory Java is allowed to use by specifying
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commandline parameters for Java. <a href="help-guide_create_shortcut.html">Create a shortcut</a>
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and add the appropriate parameter after the <code>javaw.exe</code> but
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before the <code>-jar</code> parameter.</p>
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<p>For example to restrict memory to 100 MB: <code>javaw -Xmx100M -jar "D:\Chatty\Chatty.jar"</code></p>
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<h2><a name="error">OutOfMemoryError</a></h2>
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<p>If you get an OutOfMemoryError then Java ran out of memory. This can
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either be because it simply can't allocate enough memory (at least 100 MB is recommended)
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or there is a bug that prevents it from cleaning up memory that is not
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actually used anymore. These kinds of bugs are pretty difficult to track
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down though, especially if they only occur somewhat randomly.</p>
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</body>
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</html>
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