1: #include "src/vec/vecimpl.h"

  3: #undef __FUNCT__  
  5: /*@C
  6:   VecConvertMPIToSeqAll - make available all the values of
  7:   an MPIVEC on all processors as a SEQVEC

  9:   Collective

 11:   Input Parameter: 
 12: .  vin  - input MPIVEC

 14:   Output Parameter:
 15: .  vout - output SEQVEC

 17:   Level: intermediate

 19:   Notes: Each processor will have all the values
 20: .seealso VecConvertMPIToMPIZero
 21: @*/
 22: int VecConvertMPIToSeqAll(Vec vin,Vec *vout)
 23: {

 25:   int        ierr,N;
 26:   IS         is;
 27:   VecScatter ctx;


 31:   /* Check if vin is of type VECMPI ????????? */

 35:   /* Create seq vec on each proc, with the same size of the original mpi vec */
 36:   VecGetSize(vin,&N);
 37:   VecCreateSeq(PETSC_COMM_SELF,N,vout);
 38:   /* Create the VecScatter ctx with the communication info */
 39:   ISCreateStride(PETSC_COMM_SELF,N,0,1,&is);
 40:   VecScatterCreate(vin,is,*vout,is,&ctx);
 41:   /* Now trasfer the values into the seq vector */
 42:   VecScatterBegin(vin,*vout,INSERT_VALUES,SCATTER_FORWARD,ctx);
 43:   VecScatterEnd(vin,*vout,INSERT_VALUES,SCATTER_FORWARD,ctx);

 45:   ISDestroy(is);
 46:   VecScatterDestroy(ctx);
 47:   return(0);
 48: }

 50: #undef __FUNCT__  
 52: /*@C
 53:   VecConvertMPIToMPIZero - make available all the values of
 54:   an MPIVEC on processor zero as an MPIVEC

 56:   Collective on Vec

 58:   Input Parameter: 
 59: .  vin  - input MPIVEC

 61:   Output Parameter:
 62: .  vout - output MPIVEC, with values only on processor zero.

 64:   Level: intermediate

 66: .seealso VecConvertMPIToSeqAll
 67: @*/
 68: int VecConvertMPIToMPIZero(Vec vin,Vec *vout)
 69: {

 71:   int        ierr,rank,N;
 72:   IS         is;
 73:   VecScatter ctx;


 77:   /* Check if vin is of type VECMPI ????????? */

 81:   /* Create seq vec on each proc, with the same size of the original mpi vec */
 82:   VecGetSize(vin,&N);
 83:   MPI_Comm_rank(vin->comm,&rank);

 85:   if (!rank) {
 86:     VecCreateMPI(vin->comm,N,N,vout);
 87:   } else {
 88:     VecCreateMPI(vin->comm,0,N,vout);
 89:   }

 91:   /* Create the VecScatter ctx with the communication info */
 92:   ISCreateStride(PETSC_COMM_SELF,N,0,1,&is);
 93:   VecScatterCreate(vin,is,*vout,is,&ctx);
 94:   /* Now trasfer the values into the new layout */
 95:   VecScatterBegin(vin,*vout,INSERT_VALUES,SCATTER_FORWARD,ctx);
 96:   VecScatterEnd(vin,*vout,INSERT_VALUES,SCATTER_FORWARD,ctx);
 97: 
 98:   ISDestroy(is);
 99:   VecScatterDestroy(ctx);
100:   return(0);
101: }