User 350 | 2/15/2015, 5:40:56 AM
How does powergraph split the load between the cores? I understand that gather operation may be split across the core, but the following behavior seems strange to me.
I run a program on 2 machines with 36 core each. I set powergraph to use 30 on each. First 30 minutes of the execution, I see 3000% utilization on each machine - i.e., 30 cores are utilized. - Then utilization on both machines falls down to 100% - i.e., only one core is utilized.
So, it looks like the program has some computation bottleneck at some node of the graph.
Moreover, when I run the same program on one machine and specify 30 cores, I see the same pattern: initially all 30 cores work and then just one.
What part of a vertex program can cause such a behavior? One utilized core when 1 machine is used, and 2 cores when 2 machines are used.