Shell Programming and Scripting

I wrote a very simple script that matches combinations of alphabetic characters (1-5). I want to use it to test CPU speeds of different hardware/platforms. The problem is that on multi-core/processor systems, only one CPU is being utilized to execute the script. Is there a way to change that? Shouldn't the OS automatically start using the second, third, (etc..) CPU once the first one becomes overloaded?

The script:

Code:

#!/bin/bash
for a in {a..z}
do
 for b in {a..z}
 do
  for c in {a..z}
  do
        x="$a$b$c"
     done
    done
   done
echo $x
exit

Thank you!

J.