Rockfish Hardware Summary
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
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
The following table summarizes the current node types available in the Rockfish cluster:
Type |
Count |
CPU |
GPU |
RAM |
Storage |
Total Cores |
|---|---|---|---|---|---|---|
Compute |
720 |
Intel Xeon Gold 6248R (Cascade Lake) |
N/A |
192 GB DDR4 2933MHz |
1 TB NVMe SSD |
36,864 |
Compute (Next-Gen) |
46 |
Intel Xeon Gold 6448Y (Sapphire Rapids) |
N/A |
256 GB DDR5 4800MHz |
2 TB NVMe SSD |
2,944 |
Large Memory |
25 |
Intel Xeon Gold 6248R (Cascade Lake) |
N/A |
1.5 TB DDR4 2933MHz |
1 TB NVMe SSD |
1,200 |
GPU (A100 40GB) |
18 |
Intel Xeon Gold 6248R (Cascade Lake) |
4 × NVIDIA A100 40GB |
192 GB DDR4 2933MHz |
1 TB NVMe SSD |
864 |
GPU (A100 80GB) |
10 |
Intel Xeon Gold 6338 (Icy Lake) |
4 × NVIDIA A100 80GB |
256 GB DDR4 3200MHz |
1.6 TB NVMe SSD |
640 |
GPU (L40S) |
4 |
Intel Xeon Gold 6338 |
8 × NVIDIA L40S 48GB |
512 GB DDR4 3200MHz |
3.5 TB NVMe SSD |
256 |
Fast Compute (Emerald Rapids) |
18 |
Intel Xeon Gold / Platinum 8592+ |
N/A |
512 GB TruDDR5 5600MHz |
1.8 TB NVMe SSD |
2,304 |
Note
Node specifications may change as new hardware is integrated into the cluster.
Total system core count: 45,072 cores across 841 nodes