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9718c6f31e
* include iowait in idle * guest/guestnice is accounted in user/nice, so need to subtract them to not count them twice
124 lines
3 KiB
Bash
Executable file
124 lines
3 KiB
Bash
Executable file
#!/bin/bash
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# cpu.sh - measures CPU usage at a configurable sample interval
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#
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# Usage: cpu.sh INTERVAL_IN_SECONDS
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#
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# This script will emit the following tags on stdout (N is the number
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# of logical CPUs):
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#
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# Name Type
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# --------------------
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# cpu range 0-100
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# cpu0 range 0-100
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# cpu1 range 0-100
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# ...
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# cpuN-1 range 0-100
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#
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# I.e. ‘cpu’ is the average (or aggregated) CPU usage, while cpuX is a
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# specific CPU’s usage.
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#
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# Example configuration (update every second):
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#
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# - script:
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# path: /path/to/cpu.sh
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# args: [1]
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# content: {string: {text: "{cpu}%"}}
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#
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interval=${1}
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case ${interval} in
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''|*[!0-9]*)
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echo "interval must be an integer"
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exit 1
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;;
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*)
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;;
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esac
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# Get number of CPUs, by reading /proc/stat
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# The output looks like:
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#
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# cpu A B C D ...
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# cpu0 A B C D ...
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# cpu1 A B C D ...
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# cpuN A B C D ...
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#
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# The first line is a summary line, accounting *all* CPUs
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IFS=$'\n' readarray -t all_cpu_stats < <(grep -e "^cpu" /proc/stat)
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cpu_count=$((${#all_cpu_stats[@]} - 1))
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# Arrays of ‘previous’ idle and total stats, needed to calculate the
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# difference between each sample.
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prev_idle=()
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prev_total=()
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for i in $(seq ${cpu_count}); do
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prev_idle+=(0)
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prev_total+=(0)
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done
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prev_average_idle=0
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prev_average_total=0
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while true; do
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IFS=$'\n' readarray -t all_cpu_stats < <(grep -e "^cpu" /proc/stat)
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usage=() # CPU usage in percent, 0 <= x <= 100
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average_idle=0 # All CPUs idle time since boot
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average_total=0 # All CPUs total time since boot
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for i in $(seq 0 $((cpu_count - 1))); do
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# Split this CPUs stats into an array
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stats=($(echo "${all_cpu_stats[$((i + 1))]}"))
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# man procfs(5)
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user=${stats[1]}
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nice=${stats[2]}
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system=${stats[3]}
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idle=${stats[4]}
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iowait=${stats[5]}
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irq=${stats[6]}
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softirq=${stats[7]}
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steal=${stats[8]}
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guest=${stats[9]}
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guestnice=${stats[10]}
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# Guest time already accounted for in user
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user=$((user - guest))
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nice=$((nice - guestnice))
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idle=$((idle + iowait))
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total=$((user + nice + system + irq + softirq + idle + steal + guest + guestnice))
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average_idle=$((average_idle + idle))
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average_total=$((average_total + total))
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# Diff since last sample
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diff_idle=$((idle - prev_idle[i]))
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diff_total=$((total - prev_total[i]))
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usage[i]=$((100 * (diff_total - diff_idle) / diff_total))
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prev_idle[i]=${idle}
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prev_total[i]=${total}
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done
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diff_average_idle=$((average_idle - prev_average_idle))
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diff_average_total=$((average_total - prev_average_total))
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average_usage=$((100 * (diff_average_total - diff_average_idle) / diff_average_total))
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prev_average_idle=${average_idle}
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prev_average_total=${average_total}
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echo "cpu|range:0-100|${average_usage}"
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for i in $(seq 0 $((cpu_count - 1))); do
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echo "cpu${i}|range:0-100|${usage[i]}"
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done
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echo ""
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sleep "${interval}"
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done
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