gistfile1.sh

#Pausing all but x CPU-intensive tasks

PAUSEQUEUENUM=0
ACTIVEQUEUENUM=0

function putinpausequeue {
  kill -STOP $1
  PAUSEQUEUE="$PAUSEQUEUE $1"
  PAUSEQUEUENUM=$(($PAUSEQUEUENUM+1))
  echo "Notice. I am pausing $1 . The pause queue is now $PAUSEQUEUE"
}

function regenerateactivequeue {
  OLDACTIVEQUEUE=$ACTIVEQUEUE
  ACTIVEQUEUE=""
  ACTIVEQUEUENUM=0
  for PID in $OLDACTIVEQUEUE
  do
    if [ -d /proc/$PID  ] ; then
      ACTIVEQUEUE="$ACTIVEQUEUE $PID"
      ACTIVEQUEUENUM=$(($ACTIVEQUEUENUM+1))
    fi
  done
}

function putinactivequeue {
  kill -CONT $1
  ACTIVEQUEUE="$ACTIVEQUEUE $1"
  ACTIVEQUEUENUM=$(($ACTIVEQUEUENUM+1))
  echo "Notice. I am resuming $1"
}

function processpausequeue {
  while [ $PAUSEQUEUENUM -gt 0 ]; do
    echo "Notice. There are $PAUSEQUEUENUM processes paused, and $ACTIVEQUEUENUM processes active . The paused processes are $PAUSEQUEUE , and the active processes are $ACTIVEQUEUE"
    regenerateactivequeue
    if [ $ACTIVEQUEUENUM -lt 2 ]; then
      set -- $PAUSEQUEUE
      PIDTOPROCESS=$1
      shift
      PAUSEQUEUE=$@
      PAUSEQUEUENUM=$(($PAUSEQUEUENUM-1))
      putinactivequeue $PIDTOPROCESS
    else
      echo "Notice. No processes activated"
    fi
    sleep 5
  done
  while [ $ACTIVEQUEUENUM -gt 0 ]; do
    echo "Notice. There are $ACTIVEQUEUENUM processes active . The active processeses are $ACTIVEQUEUE"
    regenerateactivequeue
    sleep 5
  done
  echo "Notice. Done now"
}

sleep 150 > log1.txt & #Insert really CPU-intensive task here
PID=$! ; sleep 1; putinpausequeue $PID
sleep 150 > log2.txt & #Insert really CPU-intensive task here
PID=$! ; sleep 1; putinpausequeue $PID
sleep 150 > log3.txt & #Insert really CPU-intensive task here
PID=$! ; sleep 1; putinpausequeue $PID

processpausequeue