First report on MAX software architecture and implementation planning

This report describes the main developments that will be performed on the MAX codes –BIGDFT, FLEUR, QUANTUM ESPRESSO, SIESTA, and YAMBO– to extend their portability, improve their efficiency and scalability, streamline their deployment and maintenance, enable selected new features and a common MAX interoperability layer. The final objective of this work is to make the codes able to operate at full efficiency on pre-exascale and exascale machines and to pave the way for the realisation of the MAX Lighthouse applications that will be deployed on the EuroHPC clusters.