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<?xml version="1.0"?>
<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
<chapter id="feature-pcp">
<title>PCP</title>
<para>If available, Cockpit uses the
<ulink url="https://pcp.io/">Performance Co-Pilot</ulink> framework to
gather metrics data about the system. This data is used to display graphs.
Cockpit can use the PCP logging feature to display archived data about the
system from a different point in time. If PCP is not available, then Cockpit
gathers the metrics data itself, but archival features are not available.</para>
<para>Whether or not metrics are archived depends on whether the
<code>pmlogger.service</code> and <code>pmcd.service</code> systemd units
are running or not. The "Store Performance Data" button in Cockpit
will enable and start these services.</para>
<para>To see similar metrics data from the command line, you can use tools like
<ulink url="https://pcp.io/books/PCP_UAG/html/LE38515-PARENT.html#LE91266-PARENT"><code>pmstat</code></ulink>
or <ulink url="https://pcp.io/books/PCP_UAG/html/LE60452-PARENT.html"><code>pminfo</code></ulink>:</para>
<programlisting>
$ <command>pmstat</command>
@ Sat Sep 26 15:30:10 2015
loadavg memory swap io system cpu
1 min swpd free buff cache pi po bi bo in cs us sy id
4.19 0 20710m 605148 6450m 0 0 0 2548 5688 14K 19 3 76
...
</programlisting>
</chapter>
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