Performance evaluation of N-body code on NVIDIA H100 PCIe and AMD MI210

We have developed gravitational N-body codes based on the direct method. Detailed performance evaluation reveals that (1) NVIDIA H100 PCIe is 2.0x faster than NVIDIA A100, (2) AMD MI210 is 1.4x faster than AMD MI100, and (3) both GPUs are 1.5x more power-efficient than their predecessors. We will discuss the origin of the observed speedup and the discrepancy with the ratio of the theoretical peak performance.