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Modify warning messages about number of GPUs #4315

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Jan 28, 2025
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Modify warning messages about number of GPUs #4315

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5 changes: 3 additions & 2 deletions Src/Base/AMReX_GpuDevice.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -204,7 +204,7 @@ Device::Initialize ()
}
else {
if (amrex::Verbose() && ParallelDescriptor::IOProcessor()) {
amrex::Warning("Multiple GPUs are visible to each MPI rank, This may lead to incorrect or suboptimal rank-to-GPU mapping.");
amrex::Warning("Multiple GPUs are visible to each MPI rank. This is usually not an issue. But this may lead to incorrect or suboptimal rank-to-GPU mapping.");
}
if (ParallelDescriptor::NProcsPerNode() == gpu_device_count) {
device_id = ParallelDescriptor::MyRankInNode();
Expand Down Expand Up @@ -322,7 +322,8 @@ Device::Initialize ()
<< ((num_devices_used == 1) ? " device.\n"
: " devices.\n");
if (num_devices_used < ParallelDescriptor::NProcs() && ParallelDescriptor::IOProcessor()) {
amrex::Warning("There are more MPI processes than the number of GPUs.");
amrex::Warning("There are more MPI processes than the number of unique GPU devices. This is not necessarily a problem.\n"
"For example this could happen when a device such as MI300A is partitioned into multiple subdevices.");
}
}

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