first commit

Makefile

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+TARGETS = main
+
+all: ${TARGETS}
+
+main: main.cpp
+	mpicxx -Wall -Wextra $< -o $@

README.md

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+# mpi_test

main.cpp

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+#include <mpi.h>
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+  // Initialize the MPI environment
+  MPI_Init(NULL, NULL);
+
+  // Get the number of processes
+  int world_size;
+  MPI_Comm_size(MPI_COMM_WORLD, &world_size);
+
+  // Get the rank of the process
+  int world_rank;
+  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 %s, rank %d out of %d processors\n", processor_name,
+         world_rank, world_size);
+
+  // Finalize the MPI environment.
+  MPI_Finalize();
+}