How to make makefile for MPI program with openMP?

Question

I have absolutely no experience in using makefile for MPI program with OpenMP. I usually run on the command prompt as

mpicc main.c -fopenmp -o Out
mpirun -np 4 Out

So now I need to utilise the makefile and my understanding is that we use makefile to run the commands in a more convenient way so logically we should type the same commands in the makefile right? So my makefile now looks like this

all: 
    mpicc main.c -fopenmp -o Out
    mpirun -np 4 Out

Is there a step by step guide on how to create a makefile for absolute beginner?

648trindade · Accepted Answer · 2019-10-17 18:12:08Z

1

Makefiles are commonly used for build/compile, test, install and uninstall programs and pieces of code. It's not very common to use it to actually run the programs, but yes, you can do it. You can create a specific rule to it, like run

CC=mpicc
CFLAGS=-fopenmp
EXE=./Out
SRCS=main.c

all:
    $(CC) $(CFLAGS) $(SRCS) -o $(EXE)

run:
    mpirun -np 4 $(EXE)

So you can compile it with just make and then invoke it with make run

NOTE: the space preceding the commands inside a rule must be a tab

Is there a step by step guide on how to create a makefile for absolute beginner?

You can give a look on this page from University of Oxford

answered Oct 17, 2019 at 18:12

648trindade

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