Aitken Supercomputer

Aitken is a petascale supercomputer housed in the Modular Supercomputing Facility (MSF) at NASA's Ames Research Center. The MSF is situated on a one-acre site that has the potential to hold 16 modules for computing and data storage. Aitken's initial module and racks containing Intel Xeon Gold "Cascade Lake" nodes were installed in 2019. Since then, the system has been expanded with 16 racks containing AMD "Rome" nodes and four racks of AMD "Milan" nodes.

System Architecture

Manufacturer: HPE
4 E-Cells (1,116 nodes), 20 Apollo 9000 racks (2,540 nodes)
15.49 Pflop/s theoretical peak
9.07 Pflop/s LINPACK rating (#58 on June 2022 TOP500 list)
172.38 Tflop/s HPCG rating (#44 on June 2022 HPCG list)
Total cores: 369,760
Total memory: 1.51 PB

Node Detail
	Intel Cascade Lake Nodes	AMD Rome Nodes	AMD Milan Nodes
Number of Nodes	1,116	2,048	512
Processor/Node	2 20-core Intel Xeon Gold 6248 processors per node	2 64-core AMD 7742 processors per node	2 64-core AMD 7763 processors per node
Processor Speed	2.5 GHz	2.25 GHz	2.45 GHz
Cache	27.5 MB shared non-inclusive by the 20 cores	256 MB per socket, each socket containing 16 core complexes (CCX)	256 MB per socket, each socket containing 16 core complexes (CCX)
Memory Type	16 GB 2Rx4 DDR4-2933V-R	32 GB 2Rx4 PC4-3200AA-R Smart Kit	32 GB 2Rx4 PC4-3200AA-R Smart Kit
Memory Size	4.8 GB per core, 192 GB per node	4 GB per core, 512 GB per node	4 GB per core, 512 GB per node
Host Channel Adapter	InfiniBand EDR host channel adapter and HDR switches	InfiniBand HDR Mezzanine cards	InfiniBand HDR Mezzanine cards

Interconnects

InfiniBand EDR and HDR
Gigabit Ethernet management network

Operating Environment

Operating System: Tri-Lab Operating System Stack (TOSS)
Job Scheduler: Altair PBS Professional
Compilers: Intel and GNU C, C++ and Fortran
MPI: HPE MPT

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