Why is the GPU based on processor core (CPU time) ?
CPU time is a good representation, in general, of the overall load generated by a single (gs) Grid-Service. As (mt) Media Temple’s GRID system develops over time, the GPU will also incorporate other measurements of system resources such as Disk I/O and Database activity. This will ultimately help site owners, with servers representing all types of usage characteristics, to understand their applications better and to plan for scalability.