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Change Spelling: Env AMREX_CUDA_ARCH #1522

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Nov 7, 2020
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Change Spelling: Env AMREX_CUDA_ARCH #1522

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5 changes: 3 additions & 2 deletions Docs/sphinx_documentation/source/GPU.rst
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Expand Up @@ -247,8 +247,9 @@ For example, on Cori GPUs you can specify the architecture as follows:
cmake [options] -DAMReX_GPU_BACKEND=CUDA -DAMReX_CUDA_ARCH=Volta /path/to/amrex/source


If no architecture is specified, CMake will default to the architecture defined in the environmental
variable ``AMReX_CUDA_ARCH``. If the latter is not defined, CMake will try to determine which GPU
If no architecture is specified, CMake will default to the architecture defined in the
*environment variable* ``AMREX_CUDA_ARCH`` (note: all caps).
If the latter is not defined, CMake will try to determine which GPU
architecture is supported by the system. If more than one is found, CMake will build for all of them.
This will generally results in a larger library and longer build times.
If autodetection fails, a set of "common" architectures is assumed.
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4 changes: 2 additions & 2 deletions Tools/CMake/AMReX_SetupCUDA.cmake
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Expand Up @@ -54,8 +54,8 @@ endif ()
message(STATUS "Enabled CUDA options:")

set(AMReX_CUDA_ARCH_DEFAULT "Auto")
if(DEFINED ENV{AMReX_CUDA_ARCH})
set(AMReX_CUDA_ARCH_DEFAULT "$ENV{AMReX_CUDA_ARCH}")
if(DEFINED ENV{AMREX_CUDA_ARCH})
set(AMReX_CUDA_ARCH_DEFAULT "$ENV{AMREX_CUDA_ARCH}")
endif()
set(AMReX_CUDA_ARCH ${AMReX_CUDA_ARCH_DEFAULT} CACHE STRING "CUDA architecture (Use 'Auto' for automatic detection)")

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