Independent Parallel Particle Layer (IPPL) is a performance portable C++ library for Particle-Mesh methods. IPPL makes use of Kokkos (https://github.com/kokkos/kokkos), HeFFTe (https://github.com/icl-utk-edu/heffte), and MPI (Message Passing Interface) to deliver a portable, massively parallel toolkit for particle-mesh methods. IPPL supports simulations in one to six dimensions, mixed precision, and asynchronous execution in different execution spaces (e.g. CPUs and GPUs).

All IPPL releases (< 3.2.0) are available under the BSD 3-clause license. Since version 3.2.0, this repository includes a modified version of the variant header by GNU, created to support compilation under CUDA 12.2 with GCC 12.3.0. This header file is available under the same terms as the GNU Standard Library; note the GNU runtime library exception. As long as this file is not removed, IPPL is available under GNU GPL version 3.

Goals of Independent Parallel Particle Layer (IPPL)

Open source modern C++ (requires at least C++ 20) library for grid and particle-based methods
Performance Portability across heterogeneous parallel architectures (different CPUs, GPUs etc.)
Development of reusable, cross-domain components to enable rapid application development
Prototyping library for the development of novel numerical methods targeting exascale architectures
Shorter time from problem inception to working parallel simulations
Primary application is particle-in-cell methods (backend of production particle accelerator code OPAL) but applicable for other use cases too