Code Generation

function.sh

gen_random() {
  NUM=$1
  if [ $(($NUM%1000000)) -eq 0 ]; then
    echo $NUM
  fi
  RAND=$(head /dev/urandom | tr -dc 'A-Za-z0-9!"#$%&'\''()*+,-./:;<=>?@[\]^_`{|}~\n\t' | head -c100)
  echo "$RAND" | gcc -x c - > /dev/null 2>&1
  RESULT=$?
  if [ $RESULT -eq 0 ]; then
    echo 'SUCCESSFULLY COMPILED!' $NUM
    echo "$RAND"
  fi
}
export -f gen_random

run_serial() {
  a=0
  COUNT=$1
  while [ $a -lt $COUNT ]
  do
    a=`expr $a + 1`
    gen_random $a
  done
}
export -f run_serial

running

$ time seq 1000 | parallel gen_random
...
real	0m12.335s
user	0m12.940s
sys	0m10.225s

$ time seq 4 | parallel -j+0 run_serial 250
...
real	0m4.361s
user	0m10.485s
sys	0m5.698s

time seq 4 | parallel -j+0 run_serial 10000000

setup

sudo apt update
sudo apt install -y build-essential
sudo mkdir /mnt/ramdisk
sudo mount -t tmpfs -o rw,size=1G tmpfs /mnt/ramdisk
cd /mnt/ramdisk

https://gist.github.com/earthgecko/3089509