Include mpi in CMakeLists

CMakeLists.txt

@@ -25,12 +25,18 @@ set(CMAKE_CXX_EXTENSIONS                  OFF)
 set(CMAKE_EXPORT_COMPILE_COMMANDS          ON)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${TORCH_CXX_FLAGS}")
 SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
-
 # Options
 # -------
 option(ENABLE_CLANG_TIDY "Enable to add clang tidy."              OFF)
 option(ENABLE_TESTING "Unit testing build"                        OFF)
 option(CODE_COVERAGE "Collect coverage from test library"         OFF)
+option(MPI_ENABLED "Enable MPI options"                           ON)
+
+if (MPI_ENABLED)
+  find_package(MPI REQUIRED)
+  message("MPI_CXX_LIBRARIES=${MPI_CXX_LIBRARIES}")
+  message("MPI_CXX_INCLUDE_DIRS=${MPI_CXX_INCLUDE_DIRS}")
+endif (MPI_ENABLED)
 
 # Boost Library
 set(Boost_USE_STATIC_LIBS OFF) 

README.md

@@ -8,6 +8,16 @@ Bayesian Network Classifier with libtorch from scratch
 
 Before compiling BayesNet.
 
+### MPI
+
+In Linux just install openmpi & openmpi-devel packages.
+
+In Mac OS X, install mpich with brew and if cmake doesn't find it, edit mpicxx wrapper to remove the ",-commons,use_dylibs" from final_ldflags
+
+```bash
+vi /opt/homebrew/bin/mpicx
+```
+
 ### boost library
 
 [Getting Started](<https://www.boost.org/doc/libs/1_83_0/more/getting_started/index.html>)

src/Platform/b_grid.cc

@@ -141,18 +141,18 @@ void list_results(json& results, std::string& model)
 
 void initialize_mpi(struct platform::ConfigMPI& config)
 {
-    int provided;
+    // int provided;
     // MPI_Init_thread(nullptr, nullptr, MPI_THREAD_MULTIPLE, &provided);
     // if (provided != MPI_THREAD_MULTIPLE) {
     //     std::cerr << "MPI_Init_thread returned " << provided << " instead of " << MPI_THREAD_MULTIPLE << std::endl;
     //     exit(1);
     // }
-    MPI_Init(nullptr, nullptr);
+    // MPI_Init(nullptr, nullptr);
-    int rank, size;
+    // int rank, size;
-    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+    // MPI_Comm_rank(MPI_COMM_WORLD, &rank);
-    MPI_Comm_size(MPI_COMM_WORLD, &size);
+    // MPI_Comm_size(MPI_COMM_WORLD, &size);
-    config.mpi_rank = rank;
+    // config.mpi_rank = rank;
-    config.mpi_size = size;
+    // config.mpi_size = size;
 }
 
 
@@ -213,8 +213,11 @@ int main(int argc, char** argv)
     } else {
         if (compute) {
             if (program.get<bool>("mpi")) {
-                initialize_mpi(mpi_config);
+                MPI_Init(nullptr, nullptr);
-                grid_search.setMPIConfig(mpi_config);
+                MPI_Comm_rank(MPI_COMM_WORLD, &config.rank);
+                MPI_Comm_size(MPI_COMM_WORLD, &config.size);
+                grid_search.go_mpi();
+                MPI_Finzalize();
             } else {
                 grid_search.go();
                 std::cout << "Process took " << timer.getDurationString() << std::endl;