Hello world

hello_world.def

@@ -0,0 +1,33 @@
+Bootstrap: docker
+From: ubuntu:20.04
+
+%post
+    echo America/Buenos_Aires > /etc/localtime
+    apt-get update
+    apt-get install -y libopenmpi-dev
+    apt-get clean
+    rm -rf /var/lib/apt/lists/*
+
+    cd /opt
+    cat << EOF > hello_mpi.c
+    #include <mpi.h>
+    #include <stdio.h>
+    #include <stdlib.h>
+
+    int main(int argc, char** argv) {
+        int world_size, world_rank;
+        char processor_name[MPI_MAX_PROCESSOR_NAME];
+
+        MPI_Init(NULL, NULL);
+        MPI_Comm_size(MPI_COMM_WORLD, &world_size);
+        MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
+        int name_len;
+        MPI_Get_processor_name(processor_name, &name_len);
+
+        printf("Hello world! Processor %s, Rank %d of %d\n", processor_name, world_rank, world_size);
+
+        MPI_Finalize();
+    }
+EOF
+
+    mpicc -o hello_mpi hello_mpi.c