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examples: scripts: cpu: fix idle and total calculation

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* include iowait in idle
* guest/guestnice is accounted in user/nice, so need to subtract them
  to not count them twice
This commit is contained in:
Daniel Eklöf 2020-11-15 12:15:16 +01:00
parent 4a9f550069
commit 9718c6f31e
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GPG key ID: 5BBD4992C116573F
1 changed files with 24 additions and 17 deletions
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41
examples/scripts/cpu.sh
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@ -65,8 +65,6 @@ while true; do
IFS=$'\n' readarray -t all_cpu_stats < <(grep -e "^cpu" /proc/stat)
usage=() # CPU usage in percent, 0 <= x <= 100
idle=() # idle time since boot, in jiffies
total=() # total time since boot, in jiffies
average_idle=0 # All CPUs idle time since boot
average_total=0 # All CPUs total time since boot
@ -75,28 +73,37 @@ while true; do
# Split this CPUs stats into an array
stats=($(echo "${all_cpu_stats[$((i + 1))]}"))
# Clear (zero out) “cpuN”
unset "stats[0]"
# man procfs(5)
user=${stats[1]}
nice=${stats[2]}
system=${stats[3]}
idle=${stats[4]}
iowait=${stats[5]}
irq=${stats[6]}
softirq=${stats[7]}
steal=${stats[8]}
guest=${stats[9]}
guestnice=${stats[10]}
# CPU idle time since boot
idle[i]=${stats[4]}
average_idle=$((average_idle + idle[i]))
# Guest time already accounted for in user
user=$((user - guest))
nice=$((nice - guestnice))
# CPU total time since boot
total[i]=0
for v in "${stats[@]}"; do
total[i]=$((total[i] + v))
done
average_total=$((average_total + total[i]))
idle=$((idle + iowait))
total=$((user + nice + system + irq + softirq + idle + steal + guest + guestnice))
average_idle=$((average_idle + idle))
average_total=$((average_total + total))
# Diff since last sample
diff_idle=$((idle[i] - prev_idle[i]))
diff_total=$((total[i] - prev_total[i]))
diff_idle=$((idle - prev_idle[i]))
diff_total=$((total - prev_total[i]))
usage[i]=$((100 * (diff_total - diff_idle) / diff_total))
prev_idle[i]=${idle[i]}
prev_total[i]=${total[i]}
prev_idle[i]=${idle}
prev_total[i]=${total}
done
diff_average_idle=$((average_idle - prev_average_idle))