Created
February 28, 2022 11:49
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cmake_minimum_required(VERSION 3.17) | |
project(dm) | |
#--- MPI ------------------------------------------------------------------- | |
find_package(MPI) | |
# Need this to comply with CMP004 policy: | |
string(STRIP "${MPI_CXX_LINK_FLAGS}" MPI_CXX_LINK_FLAGS) | |
string(STRIP "${MPI_CXX_LIBRARIES}" MPI_CXX_LIBRARIES) | |
add_library(mpi_target INTERFACE) | |
target_link_libraries(mpi_target INTERFACE ${MPI_CXX_LIBRARIES}) | |
target_include_directories(mpi_target INTERFACE ${MPI_CXX_INCLUDE_PATH}) | |
target_compile_options(mpi_target INTERFACE | |
$<$<CXX_COMPILER_ID:GNU>:-Wno-long-long> | |
$<$<CXX_COMPILER_ID:GNU>:-Wno-literal-suffix> | |
$<$<CXX_COMPILER_ID:Clang>:-Wno-long-long> | |
) | |
#--- AMGCL ----------------------------------------------------------------- | |
find_package(amgcl) | |
#--------------------------------------------------------------------------- | |
add_executable(dm dm.cpp) | |
target_link_libraries(dm amgcl::amgcl mpi_target) |
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#include <iostream> | |
#include <vector> | |
#include <amgcl/backend/builtin.hpp> | |
#include <amgcl/adapter/zero_copy.hpp> | |
#include <amgcl/mpi/distributed_matrix.hpp> | |
/* | |
* 0 1 2 3 | |
* -|-------|-------- | |
* 0 [| 1 -1 | 0 0 ] | |
* 1 [| -1 2 | -1 0 ] | |
* [|-------|-------] | |
* 2 [| 0 -1 | 2 -1 ] | |
* 3 [| 0 0 | -1 1 ] | |
*/ | |
int main(int argc, char *argv[]) { | |
MPI_Init(&argc, &argv); | |
amgcl::mpi::communicator comm(MPI_COMM_WORLD); | |
ptrdiff_t chunk = 0; | |
std::vector<size_t> loc_ptr, loc_col, rem_ptr, rem_col, z_ptr = {0, 0, 0}, z_col; | |
std::vector<double> loc_val, rem_val, z_val, x, y; | |
if (comm.rank == 0) { | |
chunk = 2; | |
loc_ptr = {0, 2, 4}; | |
loc_col = {0, 1, 0, 1}; | |
loc_val = {1.0, -1.0, -1.0, 2.0}; | |
rem_ptr = {0, 0, 1}; | |
rem_col = {2}; | |
rem_val = {-1.0}; | |
x = {1.0, 1.0}; | |
y = {0.0, 0.0}; | |
} else if (comm.rank == 1) { | |
chunk = 2; | |
loc_ptr = {0, 2, 4}; | |
loc_col = {0, 1, 0, 1}; | |
loc_val = {2.0, -1.0, -1.0, 1.0}; | |
rem_ptr = {0, 1, 1}; | |
rem_col = {1}; | |
rem_val = {-1.0}; | |
x = {1.0, 1.0}; | |
y = {0.0, 0.0}; | |
} | |
auto loc_a = amgcl::adapter::zero_copy(chunk, loc_ptr.data(), loc_col.data(), loc_val.data()); | |
auto rem_a = amgcl::adapter::zero_copy(chunk, rem_ptr.data(), rem_col.data(), rem_val.data()); | |
rem_a->ncols = 1; | |
amgcl::mpi::distributed_matrix<amgcl::backend::builtin<double>> A(comm, loc_a, rem_a); | |
auto loc_b = amgcl::adapter::zero_copy(chunk, loc_ptr.data(), loc_col.data(), loc_val.data()); | |
auto rem_b = amgcl::adapter::zero_copy(chunk, z_ptr.data(), z_col.data(), z_val.data()); | |
rem_b->ncols = 0; | |
amgcl::mpi::distributed_matrix<amgcl::backend::builtin<double>> B(comm, loc_b, rem_b); | |
auto Bt = amgcl::mpi::transpose(B); | |
auto C = amgcl::mpi::product(A, *Bt); | |
C->move_to_backend(); | |
amgcl::backend::spmv(1.0, *C, x, 0.0, y); | |
for(int i = 0; i < comm.size; ++i) { | |
if (comm.rank == i) { | |
for(auto v : y) std::cout << v << std::endl; | |
} | |
MPI_Barrier(comm); | |
} | |
MPI_Finalize(); | |
} |
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