The IBM System Blue Gene Solution is a leading edge system in the field of high performance computing (HPC). The primary computational resource of Shaheen consists of 16 racks of Blue Gene/P. Each rack contains 1024 quad-core, 32-bit, 850 MHz PowerPC compute nodes, for a total of 65,536 compute cores. Each node is equipped with 4GB of system memory, providing a total 64TB of distributed memory across the resource. The four racks of R0 (row zero) have a pset ratio of 64 (i.e., there is one 10GigE I/O node for every 64 compute nodes). The remaining three rows (R1-R3) have a pset ratio of 128.

Blue Gene nodes are interconnected by a three-dimensional point-to-point "torus" network used for general-purpose message-passing and multicast communication. Special purpose networks are provided for global collective and interrupt operations.

Blue Gene processes execute on blocks of 64, 128, 256, 512, 1024, 1536, 2048, 3072, 4096, 4608, 6144, 8192, 9216, 12288, or 16384 nodes. Processes of other sizes can execute but run on the next-largest-size block. Processes must run on a block of at least 512 nodes in order to use the torus network.​