High Performance Remote Memory Access Communication: The Armci Approach
International Journal of High Performance Computing Applications
Integrated data placement and task assignment for scientific workflows in clouds
Proceedings of the fourth international workshop on Data-intensive distributed computing
An evaluation of implementation options for MPI one-sided communication
PVM/MPI'05 Proceedings of the 12th European PVM/MPI users' group conference on Recent Advances in Parallel Virtual Machine and Message Passing Interface
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Obtaining highly accurate predictions on properties of light atomic nuclei using the Configuration Interaction (CI) method requires computing the lowest eigenvalues and associated eigenvectors of a large many-body nuclear Hamiltonian, H. One particular approach, the J-scheme, requires the projection of the H matrix into an invariant subspace. Since the matrices can be very large, enormous computing power is needed while significant stresses are put on the memory and I/O sub-systems. By exploiting the inherent localities in the problem and making use of the MPI one-sided communication routines backed by RDMA operations available in the new parallel architectures, we show that it is possible to reduce the I/O overheads drastically for large problems. This is demonstrated in the subspace projection phase of J-scheme calculations on 6Li nucleus, where our new implementation based on one-sided MPI communications outperforms the previous I/O based implementation by almost a factor of 10.