The PetscSF Scalable Communication Layer

PetscSF, the communication component of Portable, Extensible Toolkit for Scientific Computation (PETSc), is designed to provide PETSc's infrastructure suitable exascale computers that utilize GPUs and other accelerators. PetscSF provides a simple application programming interface (API) managing common patterns in scientific computations by using star-forest graph representation. supports several implementations based on MPI NVSHMEM, whose selection characteristics or target architecture. An efficient portable model network intra-node essential implementing large-scale applications. The Message Passing Interface, which has been de facto standard distributed memory systems, developed into large complex API does not yet high performance emerging heterogeneous CPU-GPU-based systems. In this article, we discuss design how it can overcome some difficulties working directly with GPUs, demonstrate its performance, scalability, novel features.