I chose Python because of its simplicity and the size of coverage area there are a lot more docs about Python&MPI friendship then about Java&MPI (there are no tutorials/manuals about mpijava at all)

MPIJava seems to me complicated and confusing. And PyMPI is great, simple and fast-to-implement.

So, the result is: 70 lines of code on Python (create 5 matrixes, split 2 of them on equal parts, spread them through all workers, gather computation results) and one evening of fun coding because I’m a newbie in Python and it is very impressive and it admires me

example:

if mpi.rank == 0 :
    MB = MT = MC = MD = ME = create_matrix(n)
    mpi.bcast((MT, MD, ME))
    print mpi.rank, "MT, MD, ME broadcasted"
else :
    print mpi.rank, "Waiting for messages"
    MB = MC = []
    MT, MD, ME = mpi.bcast()

localMB = mpi.scatter(MB)
localMC = mpi.scatter(MC)

print mpi.rank,"MB, MC scattered"

MAr = sub_matrix(mult_matrix(localMB, MT), mult_matrix(mult_matrix(localMC, MD), ME))
MA = mpi.gather(MAr)

if mpi.rank == 0 :
    #print "String received", masterString
    print mpi.rank,"Results gathered"
    print print_matrix(MA)
else:
    print mpi.rank,"Worker finished his work"