The LUMI system leverages a coherent CPU and GPU interconnect using AMD Infinity Fabric™ technology , which offers high-speed , low-latency interconnect , a unified memory for applications and boosts efficiency .
“ Applications using HPL code leverage this coherent interconnect to run the serial portions of the code in the CPU , with the parallel portions of the code on GPUs ensuring an efficient use of both the high performance of the AMD EPYC™ CPU cores and AMD Instinct™ GPU compute units . This also helps intelligently manage the data movement , thus simplifying programmability and easing the adoption of GPUs for HPC applications ,” explains Dieckmann .
He continues : “ The LUMI system also has a downstream NIC directly attached to each