topic Re: Multiple Core Monitoring script in Operating System - Linux

Multiple Core Monitoring script

Boerbokrib — Wed, 19 Oct 2011 06:00:43 GMT

I have been asked to monitor the cores of the multicore processors on our linux app servers.

I have the below script which catches the info to a file. I pull this into an excel spread sheet and use the following formula to get the percentage of each core used.(1000*($DIFF_TOTAL-$DIFF_IDLE)/$DIFF_TOTAL)/10".

However when i do a ps there are multiple sessions of the script running. How would i get this to run infinitley collect the data but not spawn so many sessions?

#!/bin/bash
# script to capture the core statistics of the cpu's
#Wayne McN 18/10/2011

DAT=`date +"%Y%m%d"`
HOSTNAM=`hostname -s`
LOGDIR=/home/sys_logs
LOGNAM=$LOGDIR/${HOSTNAM}_cpu_core.$DAT
dtim=`date +"%T"`

CPU_NO=`cat /proc/stat | grep cpu | wc -l`
CPU=1

echo "$dtim" >> $LOGNAM
while [ $CPU -le $CPU_NO ] ;do
cat /proc/stat | awk 'NR == '$CPU' { print " ",$0 >> "'$LOGNAM'" } '
CPU=$[CPU+1]
done
sleep 1

# If the date has changed stop the process
CURDAT=`date +"%Y%m%d"`
if [ $DAT != $CURDAT ]
then
exit
fi

sh /home/sys_scripts/cpu_core_stats.sh

Re: Multiple Core Monitoring script

Boerbokrib — Wed, 19 Oct 2011 06:34:29 GMT

Ok got it working.

now is there a way to do the cpu calculations within the script?

#!/bin/bash
# script to capture the core statistics of the cpu's
#Wayne McN 18/10/2011

DAT=`date +"%Y%m%d"`
HOSTNAM=`hostname -s`
LOGDIR=/home/sys_logs
LOGNAM=$LOGDIR/${HOSTNAM}_cpu_core.$DAT
#dtim=`date +"%T"`

while true ; do

dtim=`date +"%T"`
CPU_NO=`cat /proc/stat | grep cpu | wc -l`
CPU=1

echo "$dtim" >> $LOGNAM
while [ $CPU -le $CPU_NO ] ;do
cat /proc/stat | awk 'NR == '$CPU' { print " ",$0 >> "'$LOGNAM'" } '
CPU=$[CPU+1]
done
sleep 1

# If the date has changed stop the process
CURDAT=`date +"%Y%m%d"`
if [ $DAT != $CURDAT ]
then
exit
fi

done

Re: Multiple Core Monitoring script

Dennis Handly — Wed, 19 Oct 2011 18:43:00 GMT

>now is there a way to do the CPU calculations within the script?

What type of calculations?

(Note it would be very helpful if you indented the bodies of your two while loops so the control flow becomes more obvious.)