Different implementation for different backend

[lwJi]

Why are there different implementations for different backends in this example?
https://github.com/AMReX-Codes/amrex-tutorials/tree/main/ExampleCodes/Particles/ElectromagneticPIC/Exec

[WeiqunZhang]

They were written when we were experimenting with various GPU strategies.

[lwJi]

Roger that. Thanks Weiqun

[atmyers]

Hi @lwJi,

This tutorial predates the amrex::ParallelFor functionality. Originally we were exploring different options for GPU support. However, we kept the OpenMP and OpenACC examples in place so people could have examples of using those, since they are still compatible with AMReX. The "CUDA" example shows our preferred way of doing things.

[lwJi]

Roger that. Thanks Andrew