A visualization tool, TreeScope, showing the distribution of network traffic over various links on a system with a fat-tree network topology.
A multi-level direct interconnect
topology, also known as dragonfly, might be a viable option for exascale
supercomputers. However, it raises interesting questions about job scheduling,
routing and task mapping.
A finer domain decomposition for molecular
dynamics leads to communication with more and more neighboring processes.
However, at exascale, all of them might be placed on cores of the same node
thereby not increasing the intra-node communication requirements.