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Performance tuning for NVIDIA Grace-Hopper for the Gordon Bell runs #987

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Performance tuning for NVIDIA Grace-Hopper for the Gordon Bell runs #987

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a1ed1a2
Reduce registers
ntselepidis Aug 17, 2025
227d018
Set maxregcount to 128
ntselepidis Aug 26, 2025
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2 changes: 1 addition & 1 deletion CMakeLists.txt
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Expand Up @@ -499,7 +499,7 @@ function(MFC_SETUP_TARGET)
endforeach()

target_compile_options(${a_target}
PRIVATE -gpu=keep,ptxinfo,lineinfo
PRIVATE -gpu=keep,ptxinfo,lineinfo -gpu=maxregcount:128
)

if (MFC_Fastmath)
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1 change: 1 addition & 0 deletions src/simulation/m_igr.fpp
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Expand Up @@ -27,6 +27,7 @@ module m_igr
#ifdef __NVCOMPILER_GPU_UNIFIED_MEM
integer, dimension(3) :: nv_uvm_temp_on_gpu
real(wp), pointer, contiguous, dimension(:, :, :) :: jac, jac_rhs, jac_old
$:GPU_DECLARE(create='[jac, jac_rhs, jac_old]')
real(wp), allocatable, dimension(:, :, :), pinned, target :: jac_host
real(wp), allocatable, dimension(:, :, :), pinned, target :: jac_rhs_host
real(wp), allocatable, dimension(:, :, :), pinned, target :: jac_old_host
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