The scale of applications and computing systems is tremendously increasing and needs to
increase even more to realize exascale systems. As the number of nodes keeps growing …

Proceedings of the 23rd European MPI Users' Group Meeting: Towards millions of
communicating threads Page 1 Towards millions of communicating threads Hoang-Vu …

MPI usage patterns are changing as applications move towards fully-multithreaded
runtimes. However, the impact of these patterns on MPI message matching is not well …

This paper provides an in-depth analysis of the software overheads in the MPI performance-
critical path and exposes mandatory performance overheads that are unavoidable based on …

Partitioned point-to-point communication and persistent collective communication were both
recently standardized in MPI-4.0. Each offers performance and scalability advantages over …

Modern communication APIs provide increased ability to specify when, where, and how to
send data between processes. One recent innovation is fine-grained communication, where …

The Message Passing Interface (MPI) standard specifies the use of (source, tag,
communicator) tuple to identify whether an incoming message is what the receiver process …

The Message Passing Interface (MPI) is the de facto communication standard for distributed-
memory High-Performance Computing (HPC) systems. Ultra-low latency communication in …

Accelerators, such as GPUs, have proven to be highly successful in reducing execution time
and power consumption of compute-intensive applications. Even though they are already …

With the increased scale expected on future leadership-class systems, detailed information
about the resource usage and performance of MPI message matching provides important …