I implemented my own (1 second interval) mpstat command in Perl which seems
to not have the aforementioned bug, getting CPU metrics directly from
/proc/stat. I thought I'd send it over to you in case it helps troubleshoot
the issue.
Thanks
-----Original Message-----
From: Debian BTS [mailto:[email protected]] On Behalf Of Debian Bug
Tracking System
Sent: Monday, February 20, 2012 1:03 PM
To: [email protected]
Subject: Bug#660662: Acknowledgement (sysstat: mpstat shows 0% idle
incorrectly)
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--
660662: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=660662
Debian Bug Tracking System
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#!/usr/bin/perl
#NAME: Michael Mastrogiacomo
#DATE: 02-20-2012
print "cpu\t%idle\n";
open(STAT, "< /proc/stat") or die;
while(<STAT>)
{
if (/^cpu(\d+)/)
{
$cpu = $1;
@f = split;
$idle_before{$cpu} = $f[4];
$total_before{$cpu} = $f[1] + $f[2] + $f[3] + $f[4] + $f[5] + $f[6] +
$f[7] + $f[8] + $f[9];
}
}
close(STAT) or die;
sleep(1);
open(STAT, "< /proc/stat") or die;
while(<STAT>)
{
if (/^cpu(\d+)/)
{
$cpu = $1;
@f = split;
$idle_after{$cpu} = $f[4];
$total_after{$cpu} = $f[1] + $f[2] + $f[3] + $f[4] + $f[5] + $f[6] +
$f[7] + $f[8] + $f[9];
}
}
close(STAT) or die;
for($i=0; $i <= $cpu; $i++)
{
$total = $total_after{$i} - $total_before{$i};
$idle = $idle_after{$i} - $idle_before{$i};
if ($total == 0) #avoid division by 0 errors
{
$percent_busy = 0;
}
else
{
$percent_busy = ($total - $idle) * 100 / $total;
}
# round it down and add 1 for the percent_busy value for printing
$show_idle = 100 - int($percent_busy);
print $i . "\t" . $show_idle . "\n";
}
