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The EU has launched EuroHPC Joint Undertaking initiative plan to build an exascale HPC by 2025. A petascale HPC will be built in Slovenia in a concerted effort by 2020. The aim is to establish a national HPC system by own design with low maintenance and power consumption costs of the system. The HPC architecture will be unique, built from the off-the-shelf state-of-the-art components, and will operate using the open-source system software. A small HPC prototype system of about 200 TFLOP/s computing capability will be built in the first phase to test various computing nodes and components, which will be later integrated into a full-scale supercomputer with approx. 2 PFLOP/s. The throughput of Infiniband and Ethernet interconnect solutions will be of particular interest. The presentation is first focused on the architecture of HPC prototype consisting of 82 heterogeneous nodes based on double AMD Epyc and Intel Xeon SCL processors in combination with GPU nodes, with the discussion of possible variations of interconnect configurations. The network configuration of full-scale HPC with 600 AMD Epyc nodes, GPU nodes and large hard drive storage with a connection to HPC prototype will be discussed next. Possibilities of open source software for operating, provisioning and maintaining system, as well as flexibility and security of several options for user access, will be given in conclusion.
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