MPI-Hello World. Timothy H. Kaiser, PH.D.
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1 MPI-Hello World Timothy H. Kaiser, PH.D. 1
2 Calls we will Use MPI_INIT( ierr ) MPI_Get_Processor_name(myname,resultlen,ierr) MPI_FINALIZE(ierr) MPI_COMM_RANK( MPI_COMM_WORLD, myid, ierr ) MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr ) 2
3 Starting Point program hello use mpi! include mpif.h character (len=mpi_max_processor_name):: name call MPI_INIT( ierr ) call MPI_COMM_RANK( MPI_COMM_WORLD, myid, ierr ) call MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr ) call MPI_Get_processor_name(name,nlen,ierr) write(*,'("fort says Hello from",i4," on ",a)')myid,trim(name)! write (*,*) "Numprocs is ",numprocs call MPI_FINALIZE(ierr) stop end 3
4 Add MPI include files program hello use mpi! include mpif.h character (len=mpi_max_processor_name):: name call MPI_INIT( ierr ) call MPI_COMM_RANK( MPI_COMM_WORLD, myid, ierr ) call MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr ) call MPI_Get_processor_name(name,nlen,ierr) write(*,'("fort says Hello from",i4," on ",a)')myid,trim(name)! write (*,*) "Numprocs is ",numprocs call MPI_FINALIZE(ierr) stop end 4
5 Define Variables program hello use mpi! include mpif.h character (len=mpi_max_processor_name):: name integer ierr,myid,numprocs,nlen call MPI_INIT( ierr ) call MPI_COMM_RANK( MPI_COMM_WORLD, myid, ierr ) call MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr ) call MPI_Get_processor_name(name,nlen,ierr) write(*,'("fort says Hello from",i4," on ",a)')myid,trim(name)! write (*,*) "Numprocs is ",numprocs call MPI_FINALIZE(ierr) stop end 5
6 Start/Terminate MPI program hello use mpi! include mpif.h character (len=mpi_max_processor_name):: name integer ierr,myid,numprocs,nlen call MPI_INIT( ierr ) call MPI_COMM_RANK( MPI_COMM_WORLD, myid, ierr ) call MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr ) call MPI_Get_processor_name(name,nlen,ierr) write(*,'("fort says Hello from",i4," on ",a)')myid,trim(name)! write (*,*) "Numprocs is ",numprocs call MPI_FINALIZE(ierr) stop end 6
7 Get MPI task Information program hello use mpi! include mpif.h character (len=mpi_max_processor_name):: name integer ierr,myid,numprocs,nlen call MPI_INIT( ierr ) call MPI_COMM_RANK( MPI_COMM_WORLD, myid, ierr ) call MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr ) call MPI_Get_processor_name(name,nlen,ierr) write(*,'("fort says Hello from",i4," on ",a)')myid,trim(name) write (*,*) "Numprocs is ",numprocs call MPI_FINALIZE(ierr) stop end 7
8 Write out Hello numprocs times) program hello use mpi! include mpif.h character (len=mpi_max_processor_name):: name integer ierr,myid,numprocs,nlen call MPI_INIT( ierr ) call MPI_COMM_RANK( MPI_COMM_WORLD, myid, ierr ) call MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr ) call MPI_Get_processor_name(name,nlen,ierr) write(*,'("fort says Hello from",i4," on ",a)')myid,trim(name) write (*,*) "Numprocs is ",numprocs call MPI_FINALIZE(ierr) stop end 8
9 C version #include <stdio.h> #include <stdlib.h> #include <mpi.h> /************************************************************ This is a simple hello world program. Each processor prints out it's rank and the size of the current MPI run (Total number of processors). ************************************************************/ int main(int argc,char **argv) { int myid, numprocs; int resultlen; char myname[mpi_max_processor_name]; MPI_Init(&argc,&argv); MPI_Comm_size(MPI_COMM_WORLD,&numprocs); MPI_Comm_rank(MPI_COMM_WORLD,&myid); MPI_Get_processor_name(myname,&resultlen); printf("c says Hello from %4d on %s\n",myid,myname); printf("numprocs is %d\n",numprocs); MPI_Finalize(); } 9
10 C version #include <stdio.h> #include <stdlib.h> /************************************************************ This is a simple hello world program. Each processor prints out it's rank and the size of the current MPI run (Total number of processors). ************************************************************/ int main(int argc,char **argv) { } 10
11 Add Include File #include <stdio.h> #include <stdlib.h> #include <mpi.h> /************************************************************ This is a simple hello world program. Each processor prints out it's rank and the size of the current MPI run (Total number of processors). ************************************************************/ int main(int argc,char **argv) { } 11
12 Add MPI related variables #include <stdio.h> #include <stdlib.h> #include <mpi.h> /************************************************************ This is a simple hello world program. Each processor prints out it's rank and the size of the current MPI run (Total number of processors). ************************************************************/ int main(int argc,char **argv) { int myid, numprocs; int resultlen; char myname[mpi_max_processor_name]; } 12
13 Init and Finalize #include <stdio.h> #include <stdlib.h> #include <mpi.h> /************************************************************ This is a simple hello world program. Each processor prints out it's rank and the size of the current MPI run (Total number of processors). ************************************************************/ int main(int argc,char **argv) { int myid, numprocs; int resultlen; char myname[mpi_max_processor_name]; MPI_Init(&argc,&argv); } MPI_Finalize(); 13
14 Information Calls #include <stdio.h> #include <stdlib.h> #include <mpi.h> /************************************************************ This is a simple hello world program. Each processor prints out it's rank and the size of the current MPI run (Total number of processors). ************************************************************/ int main(int argc,char **argv) { int myid, numprocs; int resultlen; char myname[mpi_max_processor_name]; MPI_Init(&argc,&argv); MPI_Comm_size(MPI_COMM_WORLD,&numprocs); MPI_Comm_rank(MPI_COMM_WORLD,&myid); MPI_Get_processor_name(myname,&resultlen); } MPI_Finalize(); 14
15 Print Information #include <stdio.h> #include <stdlib.h> #include <mpi.h> /************************************************************ This is a simple hello world program. Each processor prints out it's rank and the size of the current MPI run (Total number of processors). ************************************************************/ int main(int argc,char **argv) { int myid, numprocs; int resultlen; char myname[mpi_max_processor_name]; MPI_Init(&argc,&argv); MPI_Comm_size(MPI_COMM_WORLD,&numprocs); MPI_Comm_rank(MPI_COMM_WORLD,&myid); MPI_Get_processor_name(myname,&resultlen); printf("c says Hello from %4d on %s\n",myid,myname); printf("numprocs is %d\n",numprocs); MPI_Finalize(); } 15
16 Compile Lines Blue Gene mpixlc_r hello.c -o hello.x mpixlf90_r hello.f90 -o hello.x Most other platforms mpicc hello.c -o hello.x mpif90 hello.f90 -o hello.x 16
17 Slurm Run Script #!/bin/bash -x #SBATCH --job-name="hybrid" #comment = glorified hello world" #SBATCH --nodes=2 #SBATCH --ntasks-per-node=8 #SBATCH --ntasks=16 #SBATCH --exclusive #SBATCH --time=10:00:00 # Go to the directoy from which our job was launched cd $SLURM_SUBMIT_DIR # run an application srun $SLURM_SUBMIT_DIR/hello.x To run it: sbatch myscript 17
18 Output ~]$ cat slurm-6644.out C says Hello from 5 on Task 5 of 16 (0,0,0,0,0,5) R00-M0-N00-J28 C says Hello from 11 on Task 11 of 16 (0,0,0,0,1,3) R00-M0-N00-J27 C says Hello from 7 on Task 7 of 16 (0,0,0,0,0,7) R00-M0-N00-J28 C says Hello from 13 on Task 13 of 16 (0,0,0,0,1,5) R00-M0-N00-J27 C says Hello from 6 on Task 6 of 16 (0,0,0,0,0,6) R00-M0-N00-J28 C says Hello from 10 on Task 10 of 16 (0,0,0,0,1,2) R00-M0-N00-J27 C says Hello from 2 on Task 2 of 16 (0,0,0,0,0,2) R00-M0-N00-J28 C says Hello from 15 on Task 15 of 16 (0,0,0,0,1,7) R00-M0-N00-J27 C says Hello from 1 on Task 1 of 16 (0,0,0,0,0,1) R00-M0-N00-J28 C says Hello from 8 on Task 8 of 16 (0,0,0,0,1,0) R00-M0-N00-J27 C says Hello from 12 on Task 12 of 16 (0,0,0,0,1,4) R00-M0-N00-J27 C says Hello from 0 on Task 0 of 16 (0,0,0,0,0,0) R00-M0-N00-J28 C says Hello from 9 on Task 9 of 16 (0,0,0,0,1,1) R00-M0-N00-J27 C says Hello from 4 on Task 4 of 16 (0,0,0,0,0,4) R00-M0-N00-J28 C says Hello from 3 on Task 3 of 16 (0,0,0,0,0,3) R00-M0-N00-J28 C says Hello from 14 on Task 14 of 16 (0,0,0,0,1,6) R00-M0-N00-J27 18
19 Every Site Should have A Cut/Paste guide for building and running applications Source code (hello world) Makefile script 19
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