Comments on: Monitor cpu abusers with this simple script http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html Learn the UNIX/Linux command line Mon, 06 Jun 2011 01:35:32 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Tony http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html/comment-page-1#comment-36912 Tony Mon, 08 Feb 2010 21:35:01 +0000 http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html#comment-36912 Can't you just multiply the usage by 100 to sum and divide later or does it not do that well either? IE Does '100 * .9' == 0? Can’t you just multiply the usage by 100 to sum and divide later or does it not do that well either? IE Does ’100 * .9′ == 0?

]]> By: Yinon http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html/comment-page-1#comment-21772 Yinon Thu, 11 Sep 2008 08:48:07 +0000 http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html#comment-21772 thanks for the script, it's great ! however, I found two un-covered cases: 1. defunct process (got "|Ú@: cum = cum + : syntax error: operand expected" ...) 2. dual core CPUs (got "Process cc1plus is using 120% cpu." and even "Process cc1plus is using 208% cpu." I have only dual-core, not quad-core...) thanks for the script, it’s great !
however, I found two un-covered cases:
1. defunct process (got “|Ú@: cum = cum + : syntax error: operand expected” …)
2. dual core CPUs (got “Process cc1plus is using 120% cpu.” and even “Process cc1plus is using 208% cpu.” I have only dual-core, not quad-core…)

]]> By: papah http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html/comment-page-1#comment-21578 papah Wed, 03 Sep 2008 05:06:44 +0000 http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html#comment-21578 I replaced your sum function with float_eval: float_scale=2 function float_eval() { local stat=0 local result=0.0 if [[ $# -gt 0 ]]; then result=$(echo "scale=$float_scale; $*" | bc -q 2>/dev/null) stat=$? if [[ $stat -eq 0 && -z "$result" ]]; then stat=1; fi fi echo $result return $stat } source: http://www.linuxjournal.com/content/floating-point-math-bash and changed calls to sum to use float_eval (note the extra operator required): cumUsage=$( sum $cumUsage $cpu ) to: cumUsage=$( float_eval $cumUsage + $cpu ) I replaced your sum function with float_eval:

float_scale=2
function float_eval()
{
local stat=0
local result=0.0
if [[ $# -gt 0 ]]; then
result=$(echo “scale=$float_scale; $*” | bc -q 2>/dev/null)
stat=$?
if [[ $stat -eq 0 && -z "$result" ]]; then stat=1; fi
fi
echo $result
return $stat
}
source: http://www.linuxjournal.com/content/floating-point-math-bash

and changed calls to sum to use float_eval (note the extra operator required):

cumUsage=$( sum $cumUsage $cpu )

to:

cumUsage=$( float_eval $cumUsage + $cpu )

]]> By: papah http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html/comment-page-1#comment-21576 papah Wed, 03 Sep 2008 04:32:27 +0000 http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html#comment-21576 Really useful script, thanks. Though it doesn't seem to be accurate because the sum() function only uses the integer part of the CPU usage, not the fractional part, therefore the accuracy of cumulative CPU usage for a group of processes (or users). and gets worse as the size of the group increases eg. sum 0.9 0.9 returns 0 sum 1.9 1.9 returns 2 etc. ie. consider 125 httpd processes with 0.8 CPU usage. This is actually 100% CPU usage, but your script would still return 0%... from my googling I'm seeing that bash doesn't handle floats very well. Anyone have a solution? I'll post if I work it out... Really useful script, thanks. Though it doesn’t seem to be accurate because the sum() function only uses the integer part of the CPU usage, not the fractional part, therefore the accuracy of cumulative CPU usage for a group of processes (or users). and gets worse as the size of the group increases eg.

sum 0.9 0.9 returns 0
sum 1.9 1.9 returns 2
etc.

ie. consider 125 httpd processes with 0.8 CPU usage. This is actually 100% CPU usage, but your script would still return 0%…

from my googling I’m seeing that bash doesn’t handle floats very well. Anyone have a solution? I’ll post if I work it out…

]]> By: Nick http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html/comment-page-1#comment-9958 Nick Wed, 04 Jun 2008 18:10:32 +0000 http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html#comment-9958 I was doing something similar until I discovered that the CPU usage is since the process started it is not a current value. The documentation is very misleading on this topic (in AIX). I was hoping to send an email if CPU usage on some of our processes remained too high for too long but since they are almost always running they remain at or near 0 even if in topas they are showing 50% utilization I was doing something similar until I discovered that the CPU usage is since the process started it is not a current value. The documentation is very misleading on this topic (in AIX). I was hoping to send an email if CPU usage on some of our processes remained too high for too long but since they are almost always running they remain at or near 0 even if in topas they are showing 50% utilization

]]> By: Mike http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html/comment-page-1#comment-3140 Mike Wed, 06 Feb 2008 13:47:17 +0000 http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html#comment-3140 i am using this script in solaris. It is always giving CPU usage 0%. I have modified the following Before - if [ $id -ge $startAtUid ] Modified - Before - if [[ $id -ge $startAtUid ]] Anyproblem. i am using this script in solaris.
It is always giving CPU usage 0%.

I have modified the following

Before – if [ $id -ge $startAtUid ]

Modified
- Before – if [[ $id -ge $startAtUid ]]

Anyproblem.

]]> By: admin http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html/comment-page-1#comment-2383 admin Tue, 22 Jan 2008 17:11:00 +0000 http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html#comment-2383 I don't have access to a Solaris host I can test on. Where is the script having trouble? I don’t have access to a Solaris host I can test on. Where is the script having trouble?

]]> By: Manual http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html/comment-page-1#comment-2382 Manual Tue, 22 Jan 2008 16:27:13 +0000 http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html#comment-2382 Hi , Can you please provide script for solaris? I am using solaris. Regards Manual Hi ,

Can you please provide script for solaris?

I am using solaris.

Regards
Manual

]]> By: Yuvi http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html/comment-page-1#comment-1312 Yuvi Tue, 01 Jan 2008 19:43:42 +0000 http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html#comment-1312 Is this script can be used in Solaris ? Is this script can be used in Solaris ?

]]> By: » Bash cures cancer, aprendiendo Shell script | Informática Práctica | http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html/comment-page-1#comment-76 » Bash cures cancer, aprendiendo Shell script | Informática Práctica | Fri, 19 Oct 2007 18:36:12 +0000 http://bashcurescancer.com/monitor-cpu-abusers-with-this-simple-script.html#comment-76 [...] Bash cures cancer es un completo blog dedicado a los scripts en sistemas Unix/Linux. Aprender script de Unix es bastante interesante, y puede resultar muy útil bajo éstos entornos a la hora de planificar backups, generar queries, etc. Si estás interesado en éste tema no puedes perderte éste blog, ya que encontrarás montones de interesantes scripts. Un interesante script que he encontrado es éste, para poder ver qué procesos gastan demasiada cuota de cpu. [...] [...] Bash cures cancer es un completo blog dedicado a los scripts en sistemas Unix/Linux. Aprender script de Unix es bastante interesante, y puede resultar muy útil bajo éstos entornos a la hora de planificar backups, generar queries, etc. Si estás interesado en éste tema no puedes perderte éste blog, ya que encontrarás montones de interesantes scripts. Un interesante script que he encontrado es éste, para poder ver qué procesos gastan demasiada cuota de cpu. [...]

]]>