Abstract
We describe the effort to implement the HPCG benchmark using OpenSHMEM and MPI
one-sided communication. Unlike the High Performance LINPACK (HPL) benchmark that places em-
phasis on large dense matrix computations, the HPCG benchmark is dominated by sparse operations
such as sparse matrix-vector product, sparse matrix triangular solve, and long vector operations. The
MPI one-sided implementation is developed using the one-sided OpenSHMEM implementation. Pre-
liminary results comparing the original MPI, OpenSHMEM, and MPI one-sided implementations on
an SGI cluster, Cray XK7 and Cray XC30 are presented. The results suggest the MPI, OpenSHMEM,
and MPI one-sided implementations all obtain similar overall performance but the MPI one-sided im-
plementation seems to slightly increase the run time for multigrid preconditioning in HPCG on the
Cray XK7 and Cray XC30.
