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Tutorial on Parallel Computing and Message Passing Model - C4

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Marcirio Chaves
Marcirio Chaves

This document provides a tutorial on communicating non-contiguous data and mixed data types in parallel computing using MPI (Message Passing Interface). It discusses several strategies for sending this type of complex data, including sending multiple messages, buffering using pack/unpack, and defining derived datatypes. It also covers collective communication operations like broadcast, scatter/gather, and reductions.

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Marcirio Silveira Chaves [email_address] Tutorial on Parallel Computing and Message Passing Model Part II - Day 4 ,[object Object],[object Object]
Introduction ,[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Sending Multiple Messages ,[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Sending Multiple Messages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Sending Multiple Messages ,[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Sending Multiple Messages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Sending Multiple Messages ,[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Buffering ,[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI icount = 0 do j = l, l+m-1 do i = k, k+n-1 icount = icount + 1 p(icount) = a(i,j) enddo enddo call MPI_Send(p, n*m, MPI_DOUBLE, dest, tag, MPI_COMM_WORLD, ierr)
Buffering ,[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Buffering ,[object Object],[object Object],June - 2009 LNEC-DHA-NTI icount = 0 do i = 1, m call MPI_PACK (a(k,l+i-1), n, MPI_DOUBLE, buffer , bufsize, & icount, MPI_COMM_WORLD, ierr) enddo call MPI_SEND( buffer , icount, MPI_PACKED , dest, tag, MPI_COMM_WORLD, ierr)
Buffering ,[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI icount = 0 do i = 1, m call MPI_PACK (a(k,l+i-1), n, MPI_DOUBLE, buffer, bufsize, icount , MPI_COMM_WORLD, ierr) enddo call MPI_SEND(buffer, icount , MPI_PACKED, dest, tag, MPI_COMM_WORLD, ierr)
Buffering ,[object Object],[object Object],June - 2009 LNEC-DHA-NTI icount = 0 do i = 1, m call MPI_PACK (a(k,l+i-1), n, MPI_DOUBLE, buffer, bufsize, icount, MPI_COMM_WORLD, ierr) enddo call MPI_SEND(buffer, icount, MPI_PACKED, dest, tag, MPI_COMM_WORLD, ierr)
Buffering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Buffering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI ,[object Object]
Derived Datatypes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Derived Datatypes ,[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Derived Datatypes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Derived Datatypes ,[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI ,[object Object],[object Object]
Derived Datatypes ,[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI call MPI_TYPE_VECTOR( m , n , nn , MPI_DOUBLE , my_mpi_type , ierr) call MPI_TYPE_COMMIT ( my_mpi_type , ierr) call MPI_SEND (a(k,l), 1, my_mpi_type , dest, tag, MPI_COMM_WORLD, ierr)
Derived Datatypes ,[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Constructing Derived Datatypes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Constructing Derived Datatypes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Constructing Derived Datatypes June - 2009 LNEC-DHA-NTI
Constructing Derived Datatypes ,[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Obtaining Information About Your Derived Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
 Nano-Self Test - Derived Datatypes  http://ci-tutor.ncsa.uiuc.edu/content.php?cid=1309 Questions 1-3.
Collective Communications
Collective Communication ,[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Collective Communication ,[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Collective Communication ,[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Collective Communication ,[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Collective Communication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Collective Communication ,[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Collective Communication Routines ,[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Collective Communication Routines ,[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Collective Communication Routines ,[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
Collective Communication Routines June - 2009 LNEC-DHA-NTI
Collective Communication Routines June - 2009 LNEC-DHA-NTI
Collective Communication Routines June - 2009 LNEC-DHA-NTI
Collective Communication Routines June - 2009 LNEC-DHA-NTI
Collective Communication Routines June - 2009 LNEC-DHA-NTI
Collective Communication Routines June - 2009 LNEC-DHA-NTI
Collective Communication Routines June - 2009 LNEC-DHA-NTI
Collective Communication Routines June - 2009 LNEC-DHA-NTI
Collective Communication Routines June - 2009 LNEC-DHA-NTI
June - 2009 LNEC-DHA-NTI
Fortran - Collective Communications Example ,[object Object],[object Object],[object Object],[object Object],[object Object],June - 2009 LNEC-DHA-NTI
[object Object],June - 2009 LNEC-DHA-NTI
 Self Test - Collective Communications  http://ci-tutor.ncsa.uiuc.edu/content.php?cid=1310

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Editor's Notes

  1. You will have to learn other techniques for the heavily executed portions.