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…nt an mpi_gather for strings
hmenke
reviewed
Jan 22, 2025
c++/mpi/window.hpp
Outdated
| @@ -36,6 +38,8 @@ namespace mpi { | |||
| class window { | |||
| friend class shared_window<BaseType>; | |||
| MPI_Win win{MPI_WIN_NULL}; | |||
| BaseType* base_local{nullptr}; | |||
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Suggested change
| BaseType* base_local{nullptr}; | |
| public: | |
| std::span<BaseType> base; |
c++/mpi/window.hpp
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| MPI_Datatype target_datatype = mpi_type<TargetType>::get(); | ||
| MPI_Get(origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count_, target_datatype, win); | ||
| } else { | ||
| if ((sizeof(OriginType) * origin_count) >= (sizeof(TargetType) * target_count_)) { |
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| if ((sizeof(OriginType) * origin_count) >= (sizeof(TargetType) * target_count_)) { | |
| if ((sizeof(OriginType) * origin_count) >= (sizeof(TargetType) * target_count_) + target_disp) { |
Assumes that target_disp is in bytes. (Check with the standard maybe?)
c++/mpi/window.hpp
Outdated
| if ((sizeof(OriginType) * origin_count) >= (sizeof(TargetType) * target_count_)) { | ||
| std::memcpy(origin_addr, base_local + target_disp, sizeof(TargetType) * target_count_); | ||
| } else { | ||
| std::abort(); // Not enough memory |
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Remove noexcept and throw std::bad_alloc.
c++/mpi/window.hpp
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| switch (op) { | ||
| case MPI_SUM: | ||
| for (int i = 0; i < origin_count; ++i) { | ||
| base_local[target_disp + i] += origin_addr[i]; | ||
| } | ||
| break; | ||
| case MPI_PROD: | ||
| for (int i = 0; i < origin_count; ++i) { | ||
| base_local[target_disp + i] *= origin_addr[i]; | ||
| } | ||
| break; | ||
| case MPI_MIN: | ||
| for (int i = 0; i < origin_count; ++i) { | ||
| base_local[target_disp + i] = std::min(base_local[target_disp + i], origin_addr[i]); | ||
| } | ||
| break; | ||
| case MPI_MAX: | ||
| for (int i = 0; i < origin_count; ++i) { | ||
| base_local[target_disp + i] = std::max(base_local[target_disp + i], origin_addr[i]); | ||
| } | ||
| break; | ||
| default: | ||
| std::cerr << "Error: Unsupported operation." << std::endl; | ||
| std::abort(); | ||
| } |
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For now just std::abort. We have to think of a usable solution. Maybe have a look at what all_reduce does without has_env.
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