Parallel Processing

To study the communication among the nodes of a cluster

MPI-Message Passing Interface

A library of functions or an API Allows communication between

processors in a distributed memory architecture.

Affords portability. Uses either a C or a FORTRAN

compiler.

MPI Data Types

MPI datatype handle C datatype

MPI_INT int

MPI_SHORT short

MPI_LONG long

MPI_FLOAT float

MPI_DOUBLE double

MPI_CHAR char

MPI_BYTE unsigned char

MPI Program# include <stdio.h># include <mpi.h>main(int argc, char **argv) {//codingMPI_Init(&argc, &argv);//codingMPI_Finalize();//coding}

MPI Init

NetworkNetwork

OO44

33 22

11

MPI Finalize

NetworkNetwork

OO44

33 22

11

Logging into linux

To login to linux, login name is test, password is test.

Applications>system>terminal test@linux:~>pwd /home/test

Remote login to master node

rlogin 172.16.66.27 –l ppPassword: asdfgh vi <filename>.c To go to insert mode press i To come out of insert mode press Esc.

Saving and quiting Suppose I had written vi urooj.c• :w save file as urooj.c• :w ur1.c save file as ur1.c• :w /xy/urooj.c save file as urooj.c in /xy• :w /xy/ur.c save file as ur.c in /xy• :wq save and quit• :wq ur1.c save as ur1.c and quit • :wq /xy/urooj.csave file as urooj.c in /xy and quit• :wq /xy/ur.c save file as ur.c in /xy and quit• :q quits only if work has been

saved• :q! quits without saving

Compiling and running

mpicc –o <executable file name> <source file name>

mpirun <executable file name> mpirun –np <no> <executable file

name>