warpx.profile: CMake AMReX_CUDA_ARCH

New environment hint with the same name as the CMake variable.

Docs/source/building/juwels.rst

@@ -55,6 +55,9 @@ We use the following modules and environments on the system.
    export GPUS_PER_SOCKET=2
    export GPUS_PER_NODE=4
 
+   # optimize CUDA compilation for V100 (CMake hint)
+   export AMReX_CUDA_ARCH=7.0
+
 Note that for now WarpX must rely on OpenMPI instead of the recommended MPI implementation on this platform MVAPICH2.
 
 We recommend to store the above lines in a file, such as ``$HOME/warpx.profile``, and load it into your shell after a login:

Docs/source/building/lassen.rst

@@ -58,6 +58,9 @@ We use the following modules and environments on the system.
    # fix system defaults: do not escape $ with a \ on tab completion
    shopt -s direxpand
 
+   # optimize CUDA compilation for V100
+   export AMReX_CUDA_ARCH=7.0
+
    # compiler environment hints
    export CC=$(which gcc)
    export CXX=$(which g++)

Docs/source/building/summit.rst

@@ -89,6 +89,9 @@ We use the following modules and environments on the system.
    # fix system defaults: do not escape $ with a \ on tab completion
    shopt -s direxpand
 
+   # optimize CUDA compilation for V100
+   export AMReX_CUDA_ARCH=7.0
+
    # compiler environment hints
    export CC=$(which gcc)
    export CXX=$(which g++)
@@ -136,7 +139,7 @@ Then, ``cd`` into the directory ``$HOME/src/warpx`` and use the following comman
 
    mkdir -p build
    cd build
-   cmake .. -DWarpX_OPENPMD=ON -DWarpX_DIMS=3 -DWarpX_COMPUTE=CUDA -DCMAKE_CUDA_ARCHITECTURES=70 -DAMReX_CUDA_ARCH=7.0
+   cmake .. -DWarpX_OPENPMD=ON -DWarpX_DIMS=3 -DWarpX_COMPUTE=CUDA
    make -j 10
 
 The general :ref:`cmake compile-time options <building-cmake>` apply as usual.