Ubuntu – Is there a way to autostart CPULIMIT in order to reduce excessive CPU consumption

tracker-miner-f, tracker-store, tracker-extract and dropbox processes are killing my CPU, they make it run at over 100%, overheating my laptop.

I have installed CPULIMIT and it works great restricting these processes, however, I cannot get it to autostart.

I have followed this but it does not work, the daemon starts but I think there is an error in the creation of the script and it does not actually limit any processes.

Is there a way to reduce cpu usage without having to manually do it through terminal every time I start a new session?

Ubuntu 14.04

A script I have found below, only partly runs and does not detect the PID correctly.

If someone has better knowledge than me, could you check the line:

NEW_PIDS_COMMAND="top -b -n1 -c | grep -E '$BLACK_PROCESSES_LIST' | gawk '\$9>CPU_LIMIT {print \$1}' CPU_LIMIT=$CPU_LIMIT"

Is this correct?

#!/bin/bash
# ==============================================================
# CPU limit daemon - set PID's max. percentage CPU consumptions
# ==============================================================

# Variables
CPU_LIMIT=40        # Maximum percentage CPU consumption by each PID
DAEMON_INTERVAL=3   # Daemon check interval in seconds
BLACK_PROCESSES_LIST="dropbox" # Limit only processes defined in this variable. If variable is empty (default) all violating processes are limited.
WHITE_PROCESSES_LIST=  # Limit all processes except processes defined in this variable. If variable is empty (default) all violating processes are limited.

#PID Variables
NEW_PIDS_COMMAND=       
NEW_PIDS=
LIMITED_PIDS=
QUEUE_PIDS=

# Check if both of the variables BLACK_PROCESSES_LIST or WHITE_PROCESSES_LIST are defined.
if [[ -n "$BLACK_PROCESSES_LIST" &&  -n "$WHITE_PROCESSES_LIST" ]]
then    
# If both variables are defined then error is produced.
   echo "At least one or both of the variables BLACK_PROCESSES_LIST or WHITE_PROCESSES_LIST must be empty."
   exit 1

# If Black_Processes_List is defined
elif [[ -n "$BLACK_PROCESSES_LIST" ]]
then  
# Set NEW_PIDS_COMMAND variable to below command
NEW_PIDS_COMMAND="top -b -n1 -c | grep -E '$BLACK_PROCESSES_LIST' | gawk '\$9>CPU_LIMIT {print \$1}' CPU_LIMIT=$CPU_LIMIT"

# If White_Processes_List is defined
elif [[ -n "$WHITE_PROCESSES_LIST" ]]   
then                                 
# Set NEW_PIDS_COMMAND variable to below command
   NEW_PIDS_COMMAND="top -b -n1 -c | gawk 'NR>6' | grep -E -v '$WHITE_PROCESSES_LIST' | gawk '\$9>CPU_LIMIT {print \$1}' CPU_LIMIT=$CPU_LIMIT"

else
   NEW_PIDS_COMMAND="top -b -n1 -c | gawk 'NR>6 && \$9>CPU_LIMIT {print \$1}' CPU_LIMIT=$CPU_LIMIT"
fi

# Search and limit violating PIDs
while sleep $DAEMON_INTERVAL
do
   NEW_PIDS=$(eval "$NEW_PIDS_COMMAND")                                                                    # Violating PIDs
   LIMITED_PIDS=$(ps -eo args | gawk '$1=="cpulimit" {print $3}')                                          # Already limited PIDs
   QUEUE_PIDS=$(comm -23 <(echo "$NEW_PIDS" | sort -u) <(echo "$LIMITED_PIDS" | sort -u) | grep -v '^$')   # PIDs in queue

   for i in $QUEUE_PIDS
   do
       cpulimit -p $i -l $CPU_LIMIT -z &   # Limit new violating processes
   done
done

I only want to black list specific applications so I have altered to this:

#!/bin/bash
# CPU limit of a process
#
# Variables
CPU_LIMIT=50        # Maximum percentage CPU consumption by each PID 
                    # NOTE: If your machine has one processor you can limit the percentage from 0% to 100%, which means that if you set for example 50%, your process cannot use more than 500 ms of cpu time for each second. But if your machine has four processors, percentage may vary from 0% to 400%, so setting the limit to 200% means to use no more than half of the available power.
DAEMON_INTERVAL=3   # Daemon check interval in seconds
PROCESS_1="" # Processes to be limited. If variable is empty (default) all violating processes are limited.


if [ -n "$PROCESS_1" ] # Process_1 entered
then  

    PID_1="pidof $PROCESS_1" # Set NEW_PIDS_COMMAND variable to below command

echo "Limit Process of: $PROCESS_1"

    cpulimit --pid "$PID_1" -b -l "$CPU_LIMIT" # Run cpulimit with selected paramters

else

   echo "All Processes limited to: $CPU_LIMIT"

   PID_1="top -b -n1 -c | gawk 'NR>6 && \$9>CPU_LIMIT {print \$1}' CPU_LIMIT=$CPU_LIMIT" # Set global CPU limit
fi


# Search and limit violating PIDs
while sleep $DAEMON_INTERVAL
do
   NEW_PIDS=$(eval "$PID_1")                                                                    # Violating PIDs
   LIMITED_PIDS=$(ps -eo args | gawk '$1=="cpulimit" {print $3}')                                          # Already limited PIDs
   QUEUE_PIDS=$(comm -23 <(echo "$NEW_PIDS" | sort -u) <(echo "$LIMITED_PIDS" | sort -u) | grep -v '^$')   # PIDs in queue

   for i in $QUEUE_PIDS
   do
       cpulimit -p $i -l $CPU_LIMIT -z &   # Limit new violating processes
   done
done

This works, but how do I limit multiple processes? At the moment it is either one or all … Thanks