pcp
Copy a directory tree using a configurable number of parallel processes.
Most likely, you don't need it. If you read from and/or write to a simple HDD, it can only do one thing at a time, more or less. This script was instead written for testing purposes with a special IO backend.
Usage
pcp -p <processes> <dir> <to dir>
Source dir will appear inside of destination dir, for example pcp -p 5 srcdir dstdir will produce dstdir/srcdir/...