fuck it we ball

.gitignore

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+build

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.14)
+
+project(
+    ift630_sts3
+    VERSION 0.1.0
+	DESCRIPTION "bs project to learn openMPI / openMP"
+    LANGUAGES C
+)
+
+set(src
+	src/main.c
+	)
+
+set(CMAKE_DEBUG_POSTFIX d)
+add_executable(ift630_sts3 ${src})
+
+find_package(MPI) #make it REQUIRED, if you want
+include_directories(SYSTEM ${MPI_INCLUDE_PATH})
+target_link_libraries(ift630_sts3 ${MPI_C_LIBRARIES})
+
+set_target_properties(ift630_sts3 PROPERTIES DEBUG_POSTFIX ${CMAKE_DEBUG_POSTFIX})
+target_compile_features(ift630_sts3 PRIVATE c_std_99)

src/main.c

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+/*
+  "Hello World" MPI Test Program
+*/
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include <mpi.h>
+
+int main(int argc, char** argv) {
+    // Initialize the MPI environment
+    MPI_Init(NULL, NULL);
+
+    int world_size, world_rank;
+    MPI_Comm_size(MPI_COMM_WORLD, &world_size);
+    MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
+
+    // Get the name of the processor
+    char processor_name[MPI_MAX_PROCESSOR_NAME];
+    int name_len;
+    MPI_Get_processor_name(processor_name, &name_len);
+
+    // Print off a hello world message
+    printf("Hello world from processor %s, rank %d out of %d processors\n",
+           processor_name, world_rank, world_size);
+
+
+
+  // We are assuming at least 2 processes for this task
+  if (world_size < 2) {
+    fprintf(stderr, "World size must be greater than 1 for %s\n", argv[0]);
+    MPI_Abort(MPI_COMM_WORLD, 1);
+  }
+  int number;
+  if (world_rank == 0) {
+    // If we are rank 0, set the number to -1 and send it to process 1
+    number = -1;
+    MPI_Send(
+      /* data         = */ &number, 
+      /* count        = */ 1, 
+      /* datatype     = */ MPI_INT, 
+      /* destination  = */ 1, 
+      /* tag          = */ 0, 
+      /* communicator = */ MPI_COMM_WORLD);
+  } else if (world_rank == 1) {
+    MPI_Recv(
+      /* data         = */ &number, 
+      /* count        = */ 1, 
+      /* datatype     = */ MPI_INT, 
+      /* source       = */ 0, 
+      /* tag          = */ 0, 
+      /* communicator = */ MPI_COMM_WORLD, 
+      /* status       = */ MPI_STATUS_IGNORE);
+    printf("Process 1 received number %d from process 0\n", number);
+  }
+
+    // Finalize the MPI environment.
+    MPI_Finalize();
+}
+