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The Portable Extensible Toolkit for Scientific computation (PETSc) librarydelivers scalable solvers for nonlinear time-dependent differential andalgebraic equations and for numerical optimization.The PETSc design forperformance portability addresses fundamental GPU accelerator challenges andstresses flexibility and extensibility by separating the programming model usedby the application from that used by the library, and it enables applicationdevelopers to use their preferred programming model, such as Kokkos, RAJA,SYCL, HIP, CUDA, or OpenCL, on upcoming exascale systems. A blueprint for usingGPUs from PETSc-based codes is provided, and case studies emphasize theflexibility and high performance achieved on current GPU-based systems.

Toward Performance-Portable PETSc for GPU-based Exascale Systems