HelloWorld

HelloWorld ★

The smallest AMReX program: initialize and finalize AMReX, and print from one or all MPI ranks.

Key APIs: amrex::Initialize, amrex::Finalize, amrex::Print, amrex::AllPrint

Build and run

CMake, from the repository root:

cmake -S . -B build -DAMReXTutorials_TOPICS=Base
cmake --build build --target Base_HelloWorld -j 8
cd build/Base/HelloWorld && mpiexec -n 2 ./HelloWorld

GNU Make, with AMReX cloned next to this repository:

make -j8
mpiexec -n 2 ./main3d.gnu.MPI.ex

Expected output

Hello world from AMReX version 26.10
  MPI ranks:      2
  ...