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type="topic" style="task"
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id="process-identify-hog">
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<info>
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<revision version="0.2" pkgversion="3.11" date="2014-01-26" status="review"/>
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<link type="guide" xref="index#processes-tasks" group="processes-tasks" />
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<include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
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<credit type="author copyright">
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<name>Phil Bull</name>
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<email>philbull@gmail.com</email>
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<years>2011</years>
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</credit>
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<credit type="author copyright">
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<name>Michael Hill</name>
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<email>mdhillca@gmail.com</email>
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<years>2011, 2014</years>
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</credit>
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<desc>Sort the list of processes by <gui>% CPU</gui> to see which
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application is using up the computer's resources.</desc>
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</info>
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<title>Which program is making the computer run slowly?</title>
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<comment>
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Phil Bull
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Explain how the System Monitor can be used to find
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misbehaving/resource-hogging processes. (A lot of process use 100% CPU or
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similar if they hang, for example.)
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</comment>
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A program that is using more than its share of the CPU may slow down the
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whole computer. To find which process could be doing this:
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<steps>
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<item>
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Click the <gui>Processes</gui> tab.
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</item>
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<item>
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Click the <gui>% CPU</gui> column header to sort the processes
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according to CPU use.
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<note>
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The arrow in the column header shows the sort direction; click again
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to reverse it. The arrow should point up.
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</note>
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</item>
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</steps>
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The processes at the top of the list are using the highest percentage CPU.
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Once you identify which one might be using more resources than it should, you
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can decide whether to close the program itself, or close other programs to
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try to reduce the CPU load.
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<note style = "tip">
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A process that has hung or crashed might use 100% CPU. If this happens
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you may need to <link xref="process-kill">kill</link> the process.
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</note>
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</page>
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