mpi_alltoallv deadlock/error when used to re-distribute matrix

• 6 aprilie 2010 15:04

   

   
  

  0
  
  Could someone kindly help me to re-distribute a matrix with mpi_alltoallv or anyother functions in Intel Fortran? Thanks in advance!
  
  Say I have a matrix A(I,J) with I=2 and J=78
  
  currently, A is distributed on 3 nodes along I:
  
  node 1:  A(1,1:J)
  node 2:  A(1,1:J)
  node 3: none
  
  I want to distribute it to:
  
  node 1: A(1:I, 1:26)
  node 2: A(1:I, 1:26)
  node 3: A(1:I, 1:26)
  
  
  I used a function as this:
  
  mpi_alltoallv(B0,np0,dp0,mpi_double_complex,B1,np1,dp1,mpi_double_complex,mpi_comm_world,pierr)
  
  I checked it:
  node1: np0=(26 26 26), dp0=(0 26 52), np1=(26 26 26), dp1=(0 0 0)
  node2: np0=(26 26 26), dp0=(0 26 52), np1=(26 26 26), dp1=(26 26 26)
  node3: np0=(0 0 0),      dp0=(0 0 0),    np1=(0 0 0), dp1=(52 52 52)
  
  where B0((j-1)*I+i)=A(i,j)
  
  However, the prorgag has a deadlock!!!!!!!!!!!!!!!!!!!!!!
  
  ================================================================
  
  I also tested with other case:
  I=5; J=78 with two nodes:
  
  A distribution:
  node1: A(1:3,1:78)
  node2: A(1:2,1:78)
  
  I want to re-distribute it to:
  node1: A(1:5,1:39)
  node1: A(1:5,1:39)
  
  Again with B0((j-1)*I+i)=A(i,j) :
  
  mpi_alltoallv(B0,np0,dp0,mpi_double_complex,B1,np1,dp1,mpi_double_complex,mpi_comm_world,pierr)
  
  I checked it:
  node1: np0=(117 117), dp0=(0 117), np1=(117 117), dp1=(0 0)
  node2: np0=(78 78), dp0=(0 78), np1=(78 78), dp1=(117 117)
  
  This time, it gave a error:
  
  job aborted:
  rank: node: exit code[: error message]
  node0:
  node1: 13: Fatal error in MPI_Alltoallv: Pending request (no error), error stack:
  MPI_Alltoallv(576): MPI_Alltoallv(sbuf=0x000000000517C690, scnts=0x0000000002EECC20, sdispls=0x0000000002EECBC0, MPI_DOUBLE_COMPLEX, rbuf=0x
  0000000004F42470, rcnts=0x0000000002EECB60, rdispls=0x0000000002EECB00, MPI_DOUBLE_COMPLEX, MPI_COMM_WORLD) failed
  (unknown)(): Pending request (no error)
  
  
  
  • Mesaj
  • Citare