Rockfish Cluster

The Rockfish cluster is a high-performance computing (HPC) system operated by ARCH at Johns Hopkins University. As of 2025, Rockfish consists of:

• 45,072 CPU cores across 841 nodes

• 18 nodes with 4x NVIDIA A100 (40GB) GPUs

• 10 nodes with 4x NVIDIA A100 (80GB) GPUs

• 4 nodes with 8x NVIDIA L40S (48GB) GPUs

• Theoretical peak performance: 3.3 PFLOPs

• Rmax: 2.1 PFLOPs (measured)

• Parallel file systems: 3 IBM GPFS systems totaling ~13 PB of usable space

• Network fabric: Mellanox HDR100 (1:1.5 topology)

• Top500 Ranking: #443 as of November 2023

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If users have any questions about these policies, please send an email to help@arch.jhu.edu

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