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<page xmlns="http://projectmallard.org/1.0/"
type="topic" style="task"
id="process-identify-hog">
<info>
<revision version="0.2" pkgversion="3.11" date="2014-01-26" status="review"/>
<link type="guide" xref="index#processes-tasks" group="processes-tasks" />
<include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
<credit type="author copyright">
<name>Phil Bull</name>
<email>philbull@gmail.com</email>
<years>2011</years>
</credit>
<credit type="author copyright">
<name>Michael Hill</name>
<email>mdhillca@gmail.com</email>
<years>2011, 2014</years>
</credit>
<desc>Sort the list of processes by <gui>% CPU</gui> to see which
application is using up the computer's resources.</desc>
</info>
<title>Which program is making the computer run slowly?</title>
<comment>
<cite date="2011-06-18" href="mailto:philbull@gmail.com">Phil Bull</cite>
<p>Explain how the System Monitor can be used to find
misbehaving/resource-hogging processes. (A lot of process use 100% CPU or
similar if they hang, for example.)</p>
</comment>
<p>A program that is using more than its share of the CPU may slow down the
whole computer. To find which process could be doing this:</p>
<steps>
<item>
<p>Click the <gui>Processes</gui> tab.</p>
</item>
<item>
<p>Click the <gui>% CPU</gui> column header to sort the processes
according to CPU use.</p>
<note>
<p>The arrow in the column header shows the sort direction; click again
to reverse it. The arrow should point up.</p>
</note>
</item>
</steps>
<p>The processes at the top of the list are using the highest percentage CPU.
Once you identify which one might be using more resources than it should, you
can decide whether to close the program itself, or close other programs to
try to reduce the CPU load.</p>
<note style = "tip">
<p>A process that has hung or crashed might use 100% CPU. If this happens
you may need to <link xref="process-kill">kill</link> the process.</p>
</note>
</page>
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