e measurements were made on GENCI's Irene supercomputer. Each Irene's node is a dual-socket Intel(R) Xeon(R) Platinum 8168 CPU@2.70GHz with 192GiB of RAM, with a total of 48 physical CPU cores. Parallel speedup curves are made up to 12 288 cores (i.e. 256 nodes) for i) a single iteration of the Davidson diagonalization, and ii) the hybrid semistochastic computation of E (which includes the CIPSI selection). e speedup reference corresponds to the single node calculation (48 cores).