Memory bandwidth usage value (mem_gps)

Glad to see the new trace includes memory bandwidth usage information. I've checked several machine_usage entries and found non-empty values.
I'm somehow confused with its description "Normalized to maximum memory bandwidth usage of all machines". What does this value exactly mean? For example, if the mem_gps is 5, does it mean 5% of the memory bandwidth of this machine is used? Or it just means the bandwidth is 5GB/s?

BTW, two minor concerns.
1. This value is a float but is said to be an integer in 'trace_2018.md';
2. The name 'mem_gps' for memory bandwidth, what does the 'gps' mean?

Start with trace_2018.md and inspect the documented machine_usage entries containing mem_gps. Compare the documentation with the observed value type and naming, then update the description so the unit, normalization, and field name are unambiguous; done means the documentation matches the trace data and answers the reported questions.

Written by the indexing model from the issue text.