Question regarding .attrib file from compile

When I do a compile using the AOC one of the files generated is a .attrib. It looks like this

Vectorization: 1
Max_vectorization: 16
Copies: 2
Max_copies: 2
Throughput: 0.488281
Copyfactor: 3
Sharing: 1
Max_sharing: 1
Unroll: 1
Max_unroll: 1
Throughput_unroll: 1
Aggressive_unroll: 1

I've been able to figure out what most related to, but I'm not sure what the copies, max copies, and copyfactor lines mean. I believe that one or more deal with the num_compute_units attribute, but I cannot figure out which. For some of my compiles with num_compute_units (2), copies is 1 and copyfactor is 2, others have 2 and 2, while others have 2 and 3 respectively. That's where I am getting confused.

Any help would be appreciated.