Correct plotting Linux? I am confused



I need help for good and correct plotting settings

  1. When I split up files. Is the start nonce the end nonce + 1?
    For example:

./plot -k KEY -x 1 -d /home -s 0 -n 20000 -m 8000 -t 2
./plot -k KEY -x 1 -d /home -s 20001 -n 20000 -m 8000 -t 2

I am mining on nas so -m 8000 is 2 GB RAM. Is it important to set correct staggersize.
How big shall the staggersize be? RAM Size of System?

I tested it with x plotter on Windows and xplotter Always make staggersize = nonces. Why?
What is correct.