inconsistency between partitioning combinations

[hkashyap]

Jeffrey Kopsick from GMU reported inconsistent results on the 80-20 example, when different GPU partitioning setups were adopted using 3 GPUs vs. 4 GPUs. I could reproduce the same using CPUs as well.

Of the four groups, I get consistent output for 1, 2, and 4 CPUs. In case of three CPUs:

1. exc1=>0, exc2=>0, exc3=>1, inh =>2 is consistent with 1,2, 4 CPUs
2. When I let the inhibitory group share a CPU with an excitatory group, it becomes inconsistent. Which is not an expected behavior.

On a system with two GPUs, and a run with 2 CPUs and 2 GPUs was fine.