vmstat returns good val for cpuIdle put ps shows no active process
hi
i'm running a shell script that checks the amount of cpu idle either using /usr/bin/vmstat 1 2 or sar 1 2 (on unixware) before i run some tests(if cpu idle greater than 89 I run them).
These tests are run on many platforms, linux(suse, redhat) hp-ux, unixware, aix, solaris, tru64.
When the test for cpu idle fails I do a
Code:
ps -e -o user,stime,pcpu,pid,ppid,time,tty,args
to try to find out what process is hogging the cpu, at best the output does not clearly show which process is affecting it or at worst does not return anything other than 0.0 values for %CPU for all processes.
I know that ps -e -o pcpu returns a percentage value - the CPU time divided by the time the process has been running and it will never add up to 100% but I would expect something useful.
hi
i'm running a shell script that checks the amount of cpu idle either using /usr/bin/vmstat 1 2 or sar 1 2 (on unixware) before i run some tests(if cpu idle greater than 89 I run them).
These tests are run on many platforms, linux(suse, redhat) hp-ux, unixware, aix, solaris, tru64.
When the test for cpu idle fails I do a
Code:
ps -e -o user,stime,pcpu,pid,ppid,time,tty,args
to try to find out what process is hogging the cpu, at best the output does not clearly show which process is affecting it or at worst does not return anything other than 0.0 values for %CPU for all processes.
I know that ps -e -o pcpu returns a percentage value - the CPU time divided by the time the process has been running and it will never add up to 100% but I would expect something useful.
top won't work on all platforms.
Does anyone have an ideas? Thanks in advance
First sort based on the CPU% in the reverse order, something like this:
ps -e -o user,stime,pcpu,pid,ppid,time,tty,args | sort -k3 -rn
Now couple of things (just throwing in my 2 cents):
1. vmstat shows the summary of activity since the system was booted last. Well although the output changes with the kernel state changes, the old processes would still show up if they accounting to a higher CPU.
2. Do you want to use mpstat instead of vmstat. Hmm not sure if that would really change the output much.
First sort based on the CPU% in the reverse order, something like this:
ps -e -o user,stime,pcpu,pid,ppid,time,tty,args | sort -k3 -rn
Now couple of things (just throwing in my 2 cents):
1. vmstat shows the summary of activity since the system was booted last. Well although the output changes with the kernel state changes, the old processes would still show up if they accounting to a higher CPU.
2. Do you want to use mpstat instead of vmstat. Hmm not sure if that would really change the output much.
thanks for your reply Deal_NoDeal.
The problem I'm getting is that I get 0.0 returned for all my %CPUs. AARGH!
I decided to use vmstat not mpstat as wasn't that interested in by processor just overal.
When I use vmstat I don't take the first output for the reason you state. I get the latest val output after 2 seconds
Code:
#gets the column that contains the cpu idle val as diff col on diff sys
idColNo=`/usr/bin/vmstat 1 2 | grep id | awk -v idleVal=id -f cpuIdle.awk`
#gets val that corresponds to column
cpuIdleTime=`/usr/bin/vmstat 1 2 | tail -1 | awk -v idColNo=$idColNo '{ split($0, vals); print vals[idColNo]}'`
The problem I'm getting is that I get 0.0 returned for all my %CPUs. AARGH!
I decided to use vmstat not mpstat as wasn't that interested in by processor just overal.
When I use vmstat I don't take the first output for the reason you state. I get the latest val output after 2 seconds
Code:
#gets the column that contains the cpu idle val as diff col on diff sys
idColNo=`/usr/bin/vmstat 1 2 | grep id | awk -v idleVal=id -f cpuIdle.awk`
#gets val that corresponds to column
cpuIdleTime=`/usr/bin/vmstat 1 2 | tail -1 | awk -v idColNo=$idColNo '{ split($0, vals); print vals[idColNo]}'`
Do you have ideas?
Thanks for your time
I will try to find out more on this one. Nothing useful hits me now.
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