#!/bin/bash

# use a tmp-dir in a RAM disk
mkdir -p /dev/shm/pissue || exit
cd /dev/shm/pissue || exit

# this seems to be important
export PARALLEL="--load 100%"
echo PARALLEL=$PARALLEL

echo -n "cores on $HOSTNAME: "
parallel --number-of-cores
echo

for i in $(seq 2 10); do
  i2=$[i*i]; uptime
  echo -n "$i2 files: creating "
  SECONDS=0; seq $i2 | parallel -X touch
  echo -n "(${SECONDS}s) deleting "
  SECONDS=0; ls | parallel -X rm
  echo -e "(${SECONDS}s)\n"
done

rmdir /dev/shm/pissue