alert-bad-processes: alert in case something uses 100% of CPU

Put this script into crontab, e.g.

*/2 * * * * root test -f /root/bin/alert-bad-processes && /root/bin/alert-bad-processes 0 1 &> /dev/null

A Linux script which could alert you (visually or/and audibly) when there is/are process(es) which use(s) 100% of CPU.

It's written specifically for X.org. It's currently fine-tuned for LXDM but there's a universal version which is suitable if `w` works for you.

Author: birdie-github

alert-bad-processes

@@ -0,0 +1,92 @@
+#! /bin/bash
+
+#----------------------------------------------------------------------
+# Description: alert audibly and visually if there are CPU heavy
+#              processes running
+# if argument1 == 1 then alert audibly
+# if argument2 == 1 then alert visually
+#
+# Mon Jan 11 23:11:09 2016 v1.0.1 - made `top` version agnostic
+# Wed 16 Oct 2019 09:31:20 PM - fine tune for LXDM *only*
+#
+# Author: Artem S. Tashkinov
+# Created at: Mon Jan 11 18:54:14 2016
+# Computer: localhost.localdomain
+# System: Linux 4.4.0-ic64 on x86_64
+#
+# Copyright (c) 2016-2019 Artem S. Tashkinov  All rights reserved.
+#----------------------------------------------------------------------
+
+faudio=/opt/kde3/share/sounds/KDE_Beep_ClockChime.wav
+timeout=3      # visual cue for this number of seconds
+threshold=75   # minimum CPU usage which is considered bad
+
+nl='
+'
+
+processes()
+{
+#    doesn't work: shows the aggregated CPU usage which might be very low for long running processes
+#    ps auxS | awk '{if ($3 > 80) for (i=11; i<=NF; i++) print $i" "}'
+
+#    doesn't work: top version specific
+#    HOME=/dev/null top -bn1 | tail -n +8 | awk 'BEGIN{ORS=""}{if ($9 > '$threshold') {print $9"%\t"; for (i=12; i<=NF; i++) print $i" "; print "\n"}}'
+
+#    avoid using user's top settings
+    HOME=/dev/null top -bn1 | \
+    awk '
+    BEGIN {ORS=""}
+    {
+        if ($0~/PID.*USER.*PR/) {
+            for (i=1;i<=NF;i++) {
+                if ($i~/CPU/) f_cpu=i;
+                if ($i~/COMMAND/) f_cmd=i;
+                found=1;
+            }
+        }
+        if (found) {
+            if ($f_cpu > '$threshold') {
+                print $f_cpu"%\t";
+                for (i=f_cmd; i<=NF; i++) {
+                    if ($i != "`-") # top 3.3 likes a tree structure
+                        print $i" ";
+                }
+                print "\n";
+            }
+        }
+    }'
+}
+
+if [ "$1" = 1 ]; then 
+    if [ -n "`processes`" ]; then
+        if [ -f "$faudio" ]; then
+            aplay -q "$faudio" &
+        elif eplay --version &>/dev/null; then
+            play -q -n synth 0.5 sine &
+        else
+            echo -ne '\007' &
+        fi
+    fi
+fi
+
+# LXDM version
+pid_lxdm=`pidof lxdm-session`
+Xuser=0 # this might not work - needs to be tested
+test -z "$pid_lxdm" || Xuser=`ps -u --ppid "$pid_lxdm" | tail -1 | awk '{print $1}'`
+
+if [ "$2" = 1 -a -n "$Xuser" ]; then
+    bad_processes=`processes`
+    if [ -n "$bad_processes" ]; then
+        su "$Xuser" -c "DISPLAY=:0 xmessage -center -timeout $timeout 'Detected > ${threshold}%:$nl$bad_processes' &> /dev/null" &
+    fi
+fi
+
+# Universal version in case w does work (it doesn't for LXDM)
+#if [ "$2" = 1 ]; then
+#    w | awk '/xdm/{print $1" "$2}' | while read current_user current_x; do
+#        bad_processes=`processes`
+#        if [ -n "$bad_processes" ]; then
+#            su $current_user -c "DISPLAY=$current_x xmessage -center -timeout $timeout 'Detected > ${threshold}%:$nl$bad_processes' &> /dev/null" &
+#        fi
+#    done
+#fi