EARLY EXPERIENCES WITH THE 360TF IBM BLUE GENE/L PLATFORM

G. BHANOT, J. M. DENNIS, J. EDWARDS, W. GRABOWSKI, M. GUPTA, K. JORDAN, R. D. LOFT, J. SEXTON, A. ST-CYR, S. J. THOMAS, H. M. TUFO, T. VORAN (+2 others)
2008 International Journal of Computational Methods  
The High Order Method Modeling Environment is a scalable, spectral element-based prototype for the Community Atmospheric Model component of the Community Climate System Model. The 3D moist primitive equations are solved on the cubed-sphere with a hybrid pressure η vertical coordinate using an Emanuel convective parameterization for moist processes. Semi-implicit time integration, based on a preconditioned conjugate gradient solver, circumvents the time step restrictions associated with gravity
more » ... iated with gravity waves. Benchmarks for two standard tests problems at 10 km horizontal resolution have been run on Blue Gene/L. Results obtained on a 32 rack Blue Gene/L system (65,536 processors, 183.5 TeraFlops peak) show sustained performance of 8.0 TeraFlops on 32,768 processors for the moist Held-Suarez test problem in coprocessor mode and 11.3 TeraFlops on 32,768 processors for the aqua-planet test problem, running in virtual node mode.
doi:10.1142/s0219876208001443 fatcat:wkhqlayfjreytnjgfb7y7vyrxa