Linux CPU and Memory Logging

crontab

#############################################################
# Log memory and CPU usage
#############################################################
*/5 * * * * /usr/local/bin/log_memory_usage.sh > /dev/null
*/5 * * * * /usr/local/bin/log_cpu_usage.sh > /dev/null

get_todays_avg_cpu_usage.sh

#!/bin/bash
sum=0.0
count=0
today=`date +"%x"`
for x in `cat /tmp/cpu_usage.csv | grep $today`
do
	if [[ $x == *","* ]]
	then
		count=`bc <<< $count+1`
		val=`echo $x | awk -F, '{print $2}'`
		sum=`bc <<< $sum+$val`
	fi
done
avg=`bc <<< "scale=2;$sum/$count"`
echo "avg: $avg%"

get_todays_avg_memory_usage.sh

#!/bin/bash
sum=0.0
count=0
today=`date +"%x"`
for x in `cat /tmp/memory_usage.csv | grep $today`
do
	if [[ $x == *","* ]]
	then
		count=`bc <<< $count+1`
		val=`echo $x | awk -F, '{print $2}'`
		sum=`bc <<< $sum+$val`
	fi
done
avg=`bc <<< "scale=2;$sum/$count"`
avggb=`bc <<< "scale=2;$avg/(1024*1024)"`
echo "avg: $avggb GB"

get_todays_max_cpu_usage.sh

#!/bin/bash
max=0
today=`date +"%x"`
for x in `cat /tmp/cpu_usage.csv | grep $today`
do
	if [[ $x == *","* ]]
	then
		val=`echo $x | awk -F, '{print $2}'`
		if (( $(echo "$val > $max" |bc -l) ))
		then
			max=$val
		fi
	fi
done
echo "max: $max%"

get_todays_max_memory_usage.sh

#!/bin/bash
max=0
today=`date +"%x"`
for x in `cat /tmp/memory_usage.csv | grep $today`
do
	if [[ $x == *","* ]]
	then
		val=`echo $x | awk -F, '{print $2}'`
		if [ "$val" -gt "$max" ]
		then
			max=$val
		fi
	fi
done
maxgb=`bc <<< "scale=2;$max/(1024*1024)"`
echo "max: $maxgb GB"

log_cpu_usage.sh

#!/bin/sh
sum=0.0
cpucount=`lscpu | grep "^CPU(s)" | awk '{print $2}'`
for x in `ps -e -o "%cpu" --sort=pcpu --no-headers | grep -v " 0.0"`
do 
	sum=`bc <<< $sum+$x`
done
avg=`bc <<< "scale=2;$sum/$cpucount"`
exec echo `date +"%x %X"`,$avg >> /tmp/cpu_usage.csv

log_memory_usage.sh

#!/bin/sh
total=`cat /proc/meminfo | grep MemTotal | awk '{print $2}'`
free=`cat /proc/meminfo | grep MemFree | awk '{print $2}'`
cached=`cat /proc/meminfo | grep ^Cached | awk '{print $2}'`
swaptotal=`cat /proc/meminfo | grep SwapTotal | awk '{print $2}'`
swapfree=`cat /proc/meminfo | grep SwapFree | awk '{print $2}'`
swapcached=`cat /proc/meminfo | grep SwapCached | awk '{print $2}'`
memoryused=$((total-free-cached+swaptotal-swapfree-swapcached))
exec echo `date +"%x %X"`,$memoryused >> /tmp/memory_usage.csv