cpu和内存的使用率统计

统计cpu和内存一个月的平均使用率：

#!/bin/bash
totalcpu_rate=0.0
totalmem_rate=0.0
num_days=$(ls -l /var/log/sa/sa[0-3]* | wc -l)
echo $num_days
for file in /var/log/sa/sa[0-3]*
do
    cpu_average=$(sar -f $file | grep Average | tail -n1 | awk '{printf("%.2f\n", (100-$NF))}')
    mem_average=$(sar -r -f $file | grep Average | tail -1 | awk '{printf("%.2f\n", $4)}')
    totalcpu_rate=$(echo "${cpu_average} + ${totalcpu_rate}" | bc)
    totalmem_rate=$(echo "${mem_average} + ${totalmem_rate}" | bc)
done 

cpu_average=$(echo "scale=5; $totalcpu_rate/$num_days" | bc)
mem_average=$(echo "scale=5; $totalmem_rate/$num_days" | bc)
printf "%.2f%%, %.2f%%\n" $cpu_average $mem_average >> /tmp/hostinfo.csv

统计cpu和内存一个月的使用峰值：

#!/bin/bash
cpu_min=100
mem_max=0
for file in /var/log/sa/sa[0-3]*
do
    _day_cpu_min=$(sar -f $file | awk 'BEGIN{min=100} {if(($NF ~ /^[1-9]/) && $NF< min) {min=$NF} fi} END{printf("%.2f\n", min)}')
    if [ $(echo "${_day_cpu_min} < ${cpu_min}" | bc) ]; then
        cpu_min=${_day_cpu_min}
    fi
    _day_mem_max=$(sar -r -f $file | awk 'BEGIN{max=0} {if((NF==12) && ($5 ~ /^[1-9]/) && $5>max) {max=$5} fi} END{printf("%.2f", max)}')
    if [ $(echo "${_day_mem_max} > ${mem_max}" | bc) ]; then
        mem_max=${_day_mem_max}
    fi
done 

cpu_max=$(echo "100-${cpu_min}" | bc)
echo ${cpu_max}
echo ${mem_max}

printf "%.2f%%, %.2f%%\n" $cpu_max $mem_max >> /tmp/hostinfo.csv