S4BXI: the MPI-ready Portals 4 Simulator

Julien Emmanuel, Matthieu Moy, Ludovic Henrio, Gregoire Pichon
2021 2021 29th International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS)  
We present a simulator for High Performance Computing (HPC) interconnection networks. It models Portals 4, a standard low-level API for communication, and it allows running unmodified applications that use higher-level network APIs such as the Message Passing Interface (MPI). It is based on SimGrid, a framework used to build single-threaded simulators based on a cooperative actor model. Unlike existing tools like SMPI, we rely on an actual MPI implementation, hence our simulation takes into
more » ... unt MPI's implementation details in the performance. This paper also presents a case study using the BullSequana eXascale Interconnect (BXI) made by Atos, which highlights how such a simulator can help design space exploration (DSE) for new interconnects.
doi:10.1109/mascots53633.2021.9614285 fatcat:tenquktuznh2xhktfnktecrqxm