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Wiki/Parallel Performance

Below are data from both strong (using fixed problem size) and weak (using increasingly larger problem size) scaling tests that measure the parallel performance of Athena on a variety of different machines. Since Athena is bases on an unsplit explicit update, it shows excellent scaling, even with SMR.

In these plots, efficiency is defined as the per-core performance scaled to the performance on one core.

Red Storm (Cray XT-3)

In the above figure, SN uses one core per node, VN uses two cores per node.

Kraken (Cray XT)

Kraken web-site.

Ranger (Linux cluster)

Ranger web site.

In the above, black lines are for a single level mesh, red lines are for a two-level SMR mesh.

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