From owner-freebsd-hackers@freebsd.org  Tue Oct 10 04:23:41 2017
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Date: Mon, 09 Oct 2017 23:16:16 -0500
From: "Zane C. B-H." <v.velox@vvelox.net>
To: freebsd-hackers@freebsd.org
Subject: using pctcpu
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Using https://metacpan.org/pod/BSD::Process that to get pctcpu, but I 
can't get it to line up nicely with ps.

The closest I can get is dividing pctcpu by 20, but that still tends to 
run high. For example dividing by 20 will give me 1635.8 while ps will 
show 1595.3.

I know the 1635.8 is definitely off as this machine only has 16 cores.