Compute and I/O blocks
On Blue Gene/Q, there are two types of blocks: compute blocks and I/O blocks. Compute blocks identify the hardware on Blue Gene/Q on which jobs run. I/O blocks allow the compute blocks to communicate with resources outside of the compute nodes. I/O nodes are not tightly coupled with the compute nodes they serve. Instead, compute nodes and I/O nodes are separate entities, connected through I/O links.
3.1 Compute blocks
Compute blocks consist of a number of compute nodes. Before you can submit any job to Blue Gene/Q compute ...