Date: 2015-10-02T22:02:12+00:00

Actual source code: vpscat.h
petsc-3.6.2 2015-10-02
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      2: /*
      3:      Defines the methods VecScatterBegin/End_1,2,......
      4:      This is included by vpscat.c with different values for BS

      6:      This is a terrible way of doing "templates" in C.
      7: */
      8: #define PETSCMAP1_a(a,b)  a ## _ ## b
      9: #define PETSCMAP1_b(a,b)  PETSCMAP1_a(a,b)
     10: #define PETSCMAP1(a)      PETSCMAP1_b(a,BS)

     14: PetscErrorCode PETSCMAP1(VecScatterBegin)(VecScatter ctx,Vec xin,Vec yin,InsertMode addv,ScatterMode mode)
     15: {
     16:   VecScatter_MPI_General *to,*from;
     17:   PetscScalar            *xv,*yv,*svalues;
     18:   MPI_Request            *rwaits,*swaits;
     19:   PetscErrorCode         ierr;
     20:   PetscInt               i,*indices,*sstarts,nrecvs,nsends,bs;

     23:   if (mode & SCATTER_REVERSE) {
     24:     to     = (VecScatter_MPI_General*)ctx->fromdata;
     25:     from   = (VecScatter_MPI_General*)ctx->todata;
     26:     rwaits = from->rev_requests;
     27:     swaits = to->rev_requests;
     28:   } else {
     29:     to     = (VecScatter_MPI_General*)ctx->todata;
     30:     from   = (VecScatter_MPI_General*)ctx->fromdata;
     31:     rwaits = from->requests;
     32:     swaits = to->requests;
     33:   }
     34:   bs      = to->bs;
     35:   svalues = to->values;
     36:   nrecvs  = from->n;
     37:   nsends  = to->n;
     38:   indices = to->indices;
     39:   sstarts = to->starts;
     40: #if defined(PETSC_HAVE_CUSP)
     41:   VecCUSPAllocateCheckHost(xin);
     42:   if (xin->valid_GPU_array == PETSC_CUSP_GPU) {
     43:     if (xin->spptr && ctx->spptr) {
     44:       VecCUSPCopyFromGPUSome_Public(xin,(PetscCUSPIndices)ctx->spptr);
     45:     } else {
     46:       VecCUSPCopyFromGPU(xin);
     47:     }
     48:   }
     49:   xv = *((PetscScalar**)xin->data);
     50: #else
     51:   VecGetArrayRead(xin,(const PetscScalar**)&xv);
     52: #endif

     54:   if (xin != yin) {VecGetArray(yin,&yv);}
     55:   else yv = xv;

     57:   if (!(mode & SCATTER_LOCAL)) {
     58:     if (!from->use_readyreceiver && !to->sendfirst && !to->use_alltoallv  & !to->use_window) {
     59:       /* post receives since they were not previously posted    */
     60:       if (nrecvs) {MPI_Startall_irecv(from->starts[nrecvs]*bs,nrecvs,rwaits);}
     61:     }

     63: #if defined(PETSC_HAVE_MPI_ALLTOALLW)  && !defined(PETSC_USE_64BIT_INDICES)
     64:     if (to->use_alltoallw && addv == INSERT_VALUES) {
     65:       MPI_Alltoallw(xv,to->wcounts,to->wdispls,to->types,yv,from->wcounts,from->wdispls,from->types,PetscObjectComm((PetscObject)ctx));
     66:     } else
     67: #endif
     68:     if (ctx->packtogether || to->use_alltoallv || to->use_window) {
     69:       /* this version packs all the messages together and sends, when -vecscatter_packtogether used */
     70:       PETSCMAP1(Pack)(sstarts[nsends],indices,xv,svalues,bs);
     71:       if (to->use_alltoallv) {
     72:         MPI_Alltoallv(to->values,to->counts,to->displs,MPIU_SCALAR,from->values,from->counts,from->displs,MPIU_SCALAR,PetscObjectComm((PetscObject)ctx));
     73: #if defined(PETSC_HAVE_MPI_WIN_CREATE)
     74:       } else if (to->use_window) {
     75:         PetscInt cnt;

     77:         MPI_Win_fence(0,from->window);
     78:         for (i=0; i<nsends; i++) {
     79:           cnt  = bs*(to->starts[i+1]-to->starts[i]);
     80:           MPI_Put(to->values+bs*to->starts[i],cnt,MPIU_SCALAR,to->procs[i],bs*to->winstarts[i],cnt,MPIU_SCALAR,from->window);
     81:         }
     82: #endif
     83:       } else if (nsends) {
     84:         MPI_Startall_isend(to->starts[to->n],nsends,swaits);
     85:       }
     86:     } else {
     87:       /* this version packs and sends one at a time */
     88:       for (i=0; i<nsends; i++) {
     89:         PETSCMAP1(Pack)(sstarts[i+1]-sstarts[i],indices + sstarts[i],xv,svalues + bs*sstarts[i],bs);
     90:         MPI_Start_isend(sstarts[i+1]-sstarts[i],swaits+i);
     91:       }
     92:     }

     94:     if (!from->use_readyreceiver && to->sendfirst && !to->use_alltoallv && !to->use_window) {
     95:       /* post receives since they were not previously posted   */
     96:       if (nrecvs) {MPI_Startall_irecv(from->starts[nrecvs]*bs,nrecvs,rwaits);}
     97:     }
     98:   }

    100:   /* take care of local scatters */
    101:   if (to->local.n) {
    102:     if (to->local.is_copy && addv == INSERT_VALUES) {
    103:       if (yv != xv || from->local.copy_start !=  to->local.copy_start) {
    104:         PetscMemcpy(yv + from->local.copy_start,xv + to->local.copy_start,to->local.copy_length);
    105:       }
    106:     } else {
    107:       if (xv == yv && addv == INSERT_VALUES && to->local.nonmatching_computed) {
    108:         /* only copy entries that do not share identical memory locations */
    109:         PETSCMAP1(Scatter)(to->local.n_nonmatching,to->local.slots_nonmatching,xv,from->local.slots_nonmatching,yv,addv,bs);
    110:       } else {
    111:         PETSCMAP1(Scatter)(to->local.n,to->local.vslots,xv,from->local.vslots,yv,addv,bs);
    112:       }
    113:     }
    114:   }
    115: #if defined(PETSC_HAVE_CUSP)
    116:   if (xin->valid_GPU_array != PETSC_CUSP_GPU) {
    117:     VecRestoreArrayRead(xin,(const PetscScalar**)&xv);
    118:   } else {
    119:     VecRestoreArrayRead(xin,(const PetscScalar**)&xv);
    120:   }
    121: #else
    122:   VecRestoreArrayRead(xin,(const PetscScalar**)&xv);
    123: #endif
    124:   if (xin != yin) {VecRestoreArray(yin,&yv);}
    125:   return(0);
    126: }

    128: /* --------------------------------------------------------------------------------------*/

    132: PetscErrorCode PETSCMAP1(VecScatterEnd)(VecScatter ctx,Vec xin,Vec yin,InsertMode addv,ScatterMode mode)
    133: {
    134:   VecScatter_MPI_General *to,*from;
    135:   PetscScalar            *rvalues,*yv;
    136:   PetscErrorCode         ierr;
    137:   PetscInt               nrecvs,nsends,*indices,count,*rstarts,bs;
    138:   PetscMPIInt            imdex;
    139:   MPI_Request            *rwaits,*swaits;
    140:   MPI_Status             xrstatus,*rstatus,*sstatus;

    143:   if (mode & SCATTER_LOCAL) return(0);
    144:   VecGetArray(yin,&yv);

    146:   to      = (VecScatter_MPI_General*)ctx->todata;
    147:   from    = (VecScatter_MPI_General*)ctx->fromdata;
    148:   rwaits  = from->requests;
    149:   swaits  = to->requests;
    150:   sstatus = to->sstatus;    /* sstatus and rstatus are always stored in to */
    151:   rstatus = to->rstatus;
    152:   if (mode & SCATTER_REVERSE) {
    153:     to     = (VecScatter_MPI_General*)ctx->fromdata;
    154:     from   = (VecScatter_MPI_General*)ctx->todata;
    155:     rwaits = from->rev_requests;
    156:     swaits = to->rev_requests;
    157:   }
    158:   bs      = from->bs;
    159:   rvalues = from->values;
    160:   nrecvs  = from->n;
    161:   nsends  = to->n;
    162:   indices = from->indices;
    163:   rstarts = from->starts;

    165:   if (ctx->packtogether || (to->use_alltoallw && (addv != INSERT_VALUES)) || (to->use_alltoallv && !to->use_alltoallw) || to->use_window) {
    166: #if defined(PETSC_HAVE_MPI_WIN_CREATE)
    167:     if (to->use_window) {MPI_Win_fence(0,from->window);}
    168:     else
    169: #endif
    170:     if (nrecvs && !to->use_alltoallv) {MPI_Waitall(nrecvs,rwaits,rstatus);}
    171:     PETSCMAP1(UnPack)(from->starts[from->n],from->values,indices,yv,addv,bs);
    172:   } else if (!to->use_alltoallw) {
    173:     /* unpack one at a time */
    174:     count = nrecvs;
    175:     while (count) {
    176:       if (ctx->reproduce) {
    177:         imdex = count - 1;
    178:         MPI_Wait(rwaits+imdex,&xrstatus);
    179:       } else {
    180:         MPI_Waitany(nrecvs,rwaits,&imdex,&xrstatus);
    181:       }
    182:       /* unpack receives into our local space */
    183:       PETSCMAP1(UnPack)(rstarts[imdex+1] - rstarts[imdex],rvalues + bs*rstarts[imdex],indices + rstarts[imdex],yv,addv,bs);
    184:       count--;
    185:     }
    186:   }
    187:   if (from->use_readyreceiver) {
    188:     if (nrecvs) {MPI_Startall_irecv(from->starts[nrecvs]*bs,nrecvs,rwaits);}
    189:     MPI_Barrier(PetscObjectComm((PetscObject)ctx));
    190:   }

    192:   /* wait on sends */
    193:   if (nsends  && !to->use_alltoallv  && !to->use_window) {MPI_Waitall(nsends,swaits,sstatus);}
    194:   VecRestoreArray(yin,&yv);
    195:   return(0);
    196: }

    198: #undef PETSCMAP1_a
    199: #undef PETSCMAP1_b
    200: #undef PETSCMAP1
    201: #undef BS