129 lines
5.0 KiB
Plaintext
129 lines
5.0 KiB
Plaintext
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#!/bin/bash
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# Get the procs sorted by the number of inotify watches
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# @author Carl-Erik Kopseng
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# @latest https://github.com/fatso83/dotfiles/blob/master/utils/scripts/inotify-consumers
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# Discussion leading up to answer: https://unix.stackexchange.com/questions/15509/whos-consuming-my-inotify-resources
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#
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#
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########################################## Notice ##########################################
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### Since Fall 2022 you should prefer using the following C++ version ###
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### https://github.com/mikesart/inotify-info ###
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############################################################################################
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#
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#
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# The fastest version of this script is here: https://github.com/fatso83/dotfiles/commit/inotify-consumers-v1-fastest
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# Later PRs introduced significant slowdowns at the cost of better output, but it is insignificant on most machines
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# See this for details: https://github.com/fatso83/dotfiles/pull/10#issuecomment-1122374716
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main(){
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printf "\n%${WLEN}s %${WLEN}s\n" "INOTIFY" "INSTANCES"
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printf "%${WLEN}s %${WLEN}s\n" "WATCHES" "PER "
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printf "%${WLEN}s %${WLEN}s %s\n" " COUNT " "PROCESS " "PID USER COMMAND"
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printf -- "------------------------------------------------------------\n"
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generateData
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}
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usage(){
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cat << EOF
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Usage: $0 [--help|--limits]
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-l, --limits Will print the current related limits and how to change them
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-h, --help Show this help
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FYI: Check out Michael Sartain's C++ take on this script. The resulting native executable
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is much faster, modern and feature rich. It can be found at
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https://github.com/mikesart/inotify-info
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Requires building, but is well worth the few seconds :)
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EOF
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}
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limits(){
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printf "\nCurrent limits\n-------------\n"
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sysctl fs.inotify.max_user_instances fs.inotify.max_user_watches
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cat <<- EOF
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Changing settings permanently
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-----------------------------
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echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf
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sudo sysctl -p # re-read config
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EOF
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}
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generateData() {
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local -i PROC
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local -i PID
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local -i CNT
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local -i INSTANCES
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local -i TOT
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local -i TOTINSTANCES
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# read process list into cache
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local PSLIST="$(ps ax -o pid,user=WIDE-COLUMN,command $COLSTRING)"
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local INOTIFY="$(find /proc/[0-9]*/fdinfo -type f 2>/dev/null | xargs grep ^inotify 2>/dev/null)"
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local INOTIFYCNT="$(echo "$INOTIFY" | cut -d "/" -s --output-delimiter=" " -f 3 |uniq -c | sed -e 's/:.*//')"
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# unique instances per process is denoted by number of inotify FDs
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local INOTIFYINSTANCES="$(echo "$INOTIFY" | cut -d "/" -s --output-delimiter=" " -f 3,5 | sed -e 's/:.*//'| uniq |awk '{print $1}' |uniq -c)"
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local INOTIFYUSERINSTANCES="$(echo "$INOTIFY" | cut -d "/" -s --output-delimiter=" " -f 3,5 | sed -e 's/:.*//' | uniq |
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while read PID FD; do echo $PID $FD $(grep -e "^ *${PID} " <<< "$PSLIST"|awk '{print $2}'); done | cut -d" " -f 3 | sort | uniq -c |sort -nr)"
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set -e
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cat <<< "$INOTIFYCNT" |
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{
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while read -rs CNT PROC; do # count watches of processes found
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echo "${PROC},${CNT},$(echo "$INOTIFYINSTANCES" | grep " ${PROC}$" |awk '{print $1}')"
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done
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} |
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grep -v ",0," | # remove entires without watches
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sort -n -t "," -k 2,3 -r | # sort to begin with highest numbers
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{ # group commands so that $TOT is visible in the printf
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IFS=","
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while read -rs PID CNT INSTANCES; do # show watches and corresponding process info
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printf "%$(( WLEN - 2 ))d %$(( WLEN - 2 ))d %s\n" "$CNT" "$INSTANCES" "$(grep -e "^ *${PID} " <<< "$PSLIST")"
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TOT=$(( TOT + CNT ))
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TOTINSTANCES=$(( TOTINSTANCES + INSTANCES))
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done
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# These stats should be per-user as well, since inotify limits are per-user..
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printf "\n%$(( WLEN - 2 ))d %s\n" "$TOT" "WATCHES TOTAL COUNT"
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# the total across different users is somewhat meaningless, not printing for now.
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# printf "\n%$(( WLEN - 2 ))d %s\n" "$TOTINSTANCES" "TOTAL INSTANCES COUNT"
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}
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echo ""
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echo "INotify instances per user (e.g. limits specified by fs.inotify.max_user_instances): "
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echo ""
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(
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echo "INSTANCES USER"
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echo "----------- ------------------"
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echo "$INOTIFYUSERINSTANCES"
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) | column -t
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echo ""
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exit 0
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}
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# get terminal width
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declare -i COLS=$(tput cols 2>/dev/null || echo 80)
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declare -i WLEN=10
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declare COLSTRING="--columns $(( COLS - WLEN ))" # get terminal width
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if [ "$1" = "--limits" -o "$1" = "-l" ]; then
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limits
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exit 0
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fi
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if [ "$1" = "--help" -o "$1" = "-h" ]; then
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usage
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exit 0
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fi
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# added this line and moved some declarations to allow for the full display instead of a truncated version
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if [ "$1" = "--full" -o "$1" = "-f" ]; then
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unset COLSTRING
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main
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fi
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if [ -n "$1" ]; then
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printf "\nUnknown parameter '$1'\n" >&2
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usage
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exit 1
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fi
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main
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