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)

 12: PetscErrorCode PETSCMAP1(VecScatterBeginMPI1)(VecScatter ctx,Vec xin,Vec yin,InsertMode addv,ScatterMode mode)
 13: {
 14:   VecScatter_MPI_General *to,*from;
 15:   PetscScalar            *xv,*yv,*svalues;
 16:   MPI_Request            *rwaits,*swaits;
 17:   PetscErrorCode         ierr;
 18:   PetscInt               i,*indices,*sstarts,nrecvs,nsends,bs;
 19: #if defined(PETSC_HAVE_VECCUDA)
 20:   PetscBool              is_cudatype = PETSC_FALSE;
 21: #endif

 24:   if (mode & SCATTER_REVERSE) {
 25:     to     = (VecScatter_MPI_General*)ctx->fromdata;
 26:     from   = (VecScatter_MPI_General*)ctx->todata;
 27:     rwaits = from->rev_requests;
 28:     swaits = to->rev_requests;
 29:   } else {
 30:     to     = (VecScatter_MPI_General*)ctx->todata;
 31:     from   = (VecScatter_MPI_General*)ctx->fromdata;
 32:     rwaits = from->requests;
 33:     swaits = to->requests;
 34:   }
 35:   bs      = to->bs;
 36:   svalues = to->values;
 37:   nrecvs  = from->n;
 38:   nsends  = to->n;
 39:   indices = to->indices;
 40:   sstarts = to->starts;
 41: #if defined(PETSC_HAVE_VECCUDA)
 42:   PetscObjectTypeCompareAny((PetscObject)xin,&is_cudatype,VECSEQCUDA,VECMPICUDA,VECCUDA,"");
 43:   if (is_cudatype) {
 44:     VecCUDAAllocateCheckHost(xin);
 45:     if (xin->valid_GPU_array == PETSC_OFFLOAD_GPU) {
 46:       if (xin->spptr && ctx->spptr) {
 47:         VecCUDACopyFromGPUSome_Public(xin,(PetscCUDAIndices)ctx->spptr,mode);
 48:       } else {
 49:         VecCUDACopyFromGPU(xin);
 50:       }
 51:     }
 52:     xv = *((PetscScalar**)xin->data);
 53:   } else
 54: #endif
 55:   {
 56:     VecGetArrayRead(xin,(const PetscScalar**)&xv);
 57:   }

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

 62:   if (!(mode & SCATTER_LOCAL)) {
 63:     /* post receives since they were not previously posted    */
 64:     if (nrecvs) {MPI_Startall_irecv(from->starts[nrecvs]*bs,nrecvs,rwaits);}

 66:     /* this version packs and sends one at a time */
 67:     for (i=0; i<nsends; i++) {
 68:       if (to->memcpy_plan.optimized[i]) { /* use memcpy instead of indivisual load/store */
 69:         VecScatterMemcpyPlanExecute_Pack(i,xv,&to->memcpy_plan,svalues+bs*sstarts[i],INSERT_VALUES,bs);
 70:       } else {
 71:         PETSCMAP1(Pack_MPI1)(sstarts[i+1]-sstarts[i],indices + sstarts[i],xv,svalues + bs*sstarts[i],bs);
 72:       }
 73:       MPI_Start_isend((sstarts[i+1]-sstarts[i])*bs,swaits+i);
 74:     }
 75:   }

 77:   /* take care of local scatters */
 78:   if (to->local.n) {
 79:     if (to->local.memcpy_plan.optimized[0] && addv == INSERT_VALUES) {
 80:       /* do copy when it is not a self-to-self copy */
 81:       if (!(xv == yv && to->local.memcpy_plan.same_copy_starts)) { VecScatterMemcpyPlanExecute_Scatter(0,xv,&to->local.memcpy_plan,yv,&from->local.memcpy_plan,addv); }
 82:     } else if (to->local.memcpy_plan.optimized[0]) {
 83:       VecScatterMemcpyPlanExecute_Scatter(0,xv,&to->local.memcpy_plan,yv,&from->local.memcpy_plan,addv);
 84:     } else {
 85:       if (xv == yv && addv == INSERT_VALUES && to->local.nonmatching_computed) {
 86:         /* only copy entries that do not share identical memory locations */
 87:         PETSCMAP1(Scatter_MPI1)(to->local.n_nonmatching,to->local.slots_nonmatching,xv,from->local.slots_nonmatching,yv,addv,bs);
 88:       } else {
 89:         PETSCMAP1(Scatter_MPI1)(to->local.n,to->local.vslots,xv,from->local.vslots,yv,addv,bs);
 90:       }
 91:     }
 92:   }
 93:   VecRestoreArrayRead(xin,(const PetscScalar**)&xv);
 94:   if (xin != yin) {VecRestoreArray(yin,&yv);}
 95:   return(0);
 96: }

 98: /* --------------------------------------------------------------------------------------*/

100: PetscErrorCode PETSCMAP1(VecScatterEndMPI1)(VecScatter ctx,Vec xin,Vec yin,InsertMode addv,ScatterMode mode)
101: {
102:   VecScatter_MPI_General *to,*from;
103:   PetscScalar            *rvalues,*yv;
104:   PetscErrorCode         ierr;
105:   PetscInt               nrecvs,nsends,*indices,count,*rstarts,bs;
106:   PetscMPIInt            imdex;
107:   MPI_Request            *rwaits,*swaits;
108:   MPI_Status             xrstatus,*sstatus;

111:   if (mode & SCATTER_LOCAL) return(0);
112:   VecGetArray(yin,&yv);

114:   to      = (VecScatter_MPI_General*)ctx->todata;
115:   from    = (VecScatter_MPI_General*)ctx->fromdata;
116:   rwaits  = from->requests;
117:   swaits  = to->requests;
118:   sstatus = to->sstatus;    /* sstatus and rstatus are always stored in to */
119:   if (mode & SCATTER_REVERSE) {
120:     to     = (VecScatter_MPI_General*)ctx->fromdata;
121:     from   = (VecScatter_MPI_General*)ctx->todata;
122:     rwaits = from->rev_requests;
123:     swaits = to->rev_requests;
124:   }
125:   bs      = from->bs;
126:   rvalues = from->values;
127:   nrecvs  = from->n;
128:   nsends  = to->n;
129:   indices = from->indices;
130:   rstarts = from->starts;

132:   /* unpack one at a time */
133:   count = nrecvs;
134:   while (count) {
135:     MPI_Waitany(nrecvs,rwaits,&imdex,&xrstatus);
136:     /* unpack receives into our local space */
137:     if (from->memcpy_plan.optimized[imdex]) {
138:       VecScatterMemcpyPlanExecute_Unpack(imdex,rvalues+bs*rstarts[imdex],yv,&from->memcpy_plan,addv,bs);
139:     } else {
140:       PETSCMAP1(UnPack_MPI1)(rstarts[imdex+1] - rstarts[imdex],rvalues + bs*rstarts[imdex],indices + rstarts[imdex],yv,addv,bs);
141:     }
142:     count--;
143:   }

145:   /* wait on sends */
146:   if (nsends) {MPI_Waitall(nsends,swaits,sstatus);}
147:   VecRestoreArray(yin,&yv);
148:   return(0);
149: }

151: #undef PETSCMAP1_a
152: #undef PETSCMAP1_b
153: #undef PETSCMAP1
154: #undef BS