The Atos HPCF consists of four virtually identical complexes: AA, AB, AC and AD. In total, this HPCF features 8128 nodes:
- 7680 compute nodes, for parallel jobs
- 448 GPIL (General Purpose and Interactive Login) nodes, which are devised to integrate the interactive and post-processing work from older platforms such as the Cray HPCF, ECGATE and Linux Clusters.
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There is an additional virtual complex, ECS, which is made from compute nodes of the 4 complexes. This is the one to be used by those users who don't have access to the full HPCF service. |
The logic structure of one of the complexes is as follows:
Main differences with the previous Cray XC40 system
The most notable change with respect to the previous Cray XC40 HPCF is in the processor architecture, from Intel to AMD. Although both implement the x86_64 instruction set, the latter has many more cores.
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Core Frequency
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AG cluster is based on the Eviden BullSequana XH3000 architecture, and consists of 30 accelerated compute nodes each configured with four Grace Hopper GH200 Superchips.
- Each node has 4 Grace Hopper superchips, a total of 480 GB of RAM and 384 GB of HBM3. Note that the GPU memory is also seen as main memory, so you will see a total of ~864 GB of RAM.
- Each grace chip has 72 ARM cores, 120GB of RAM and 96 GB HBM3 as GPU memory.
- Each node also has a local NVME of 3.5 TB mounted, accessible through $TMPDIR.
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