Ejemplo n.º 1
0
  int MESH_ConcatSubMesh_Region(Mesh_ptr mesh, int num, Mesh_ptr *submeshes) {
    int nrf, nre, nrv, nfe, i, j, k, num_parbndry_verts, num_parbndry_edges, num_parbndry_faces, ival;
    MVertex_ptr mv, new_mv, sub_mv;
    MEdge_ptr me, new_me, sub_me;
    MFace_ptr mf, new_mf, sub_mf;
    MRegion_ptr new_mr, sub_mr;
    List_ptr mrfaces, mredges, mrverts, mfedges;
    int add_region, idx, global_id, iloc, *loc;
    double coor[3], rval;
    void *pval;
    Mesh_ptr submesh;

    List_ptr parbndry_verts = List_New(10);        
    List_ptr parbndry_edges = List_New(10);
    List_ptr parbndry_faces = List_New(10);

    MFace_ptr *rfaces = (MFace_ptr *) malloc(MAXPF3*sizeof(MFace_ptr));
    int *rfdirs = (int *) malloc(MAXPF3*sizeof(int));
    MEdge_ptr *fedges = (MEdge_ptr *) malloc(MAXPV2*sizeof(MEdge_ptr));
    int *fedirs = (int *) malloc(MAXPV2*sizeof(int));

    MAttrib_ptr parbndryatt = MAttrib_New(mesh, "on_parbndry", INT, MVERTEX);
    
    /* collect faces, edges and vertices on the partition boundary */
    idx = 0; num_parbndry_faces = 0;
    while ((mf = MESH_Next_Face(mesh,&idx))) 
      if (MF_PType(mf) != PINTERIOR) {
        List_Add(parbndry_faces,mf);
        num_parbndry_faces++;
      }
    idx = 0; num_parbndry_edges = 0;
    while ((me = MESH_Next_Edge(mesh,&idx))) 
      if (ME_PType(me) != PINTERIOR) {
        List_Add(parbndry_edges,me);
        num_parbndry_edges++;
      }
    idx = 0; num_parbndry_verts = 0;
    while ((mv = MESH_Next_Vertex(mesh,&idx)))
      if (MV_PType(mv) != PINTERIOR) {
        List_Add(parbndry_verts,mv);
        MEnt_Set_AttVal(mv, parbndryatt, 1, 0.0, NULL);
        num_parbndry_verts++;
      }
    
    /* sort based on global ID */
    List_Sort(parbndry_faces,num_parbndry_faces,sizeof(MFace_ptr),compareGlobalID);
    List_Sort(parbndry_edges,num_parbndry_edges,sizeof(MEdge_ptr),compareGlobalID);
    List_Sort(parbndry_verts,num_parbndry_verts,sizeof(MVertex_ptr),compareGlobalID);

    int *parbndry_vert_gids = (int *)malloc(num_parbndry_verts*sizeof(int));
    int *parbndry_edge_gids = (int *)malloc(num_parbndry_edges*sizeof(int));
    int *parbndry_face_gids = (int *)malloc(num_parbndry_faces*sizeof(int));

    /* store them in array for binary search */
    for (i = 0; i < num_parbndry_faces; i++) {
      mf = List_Entry(parbndry_faces,i);
      parbndry_face_gids[i] = MF_GlobalID(mf);
    }
    for (i = 0; i < num_parbndry_edges; i++) {
      me = List_Entry(parbndry_edges,i);
      parbndry_edge_gids[i] = ME_GlobalID(me);
    }
    for (i = 0; i < num_parbndry_verts; i++) {
      mv = List_Entry(parbndry_verts,i);
      parbndry_vert_gids[i] = MV_GlobalID(mv);
    }

   /* Make list of new edges and vertices which will be updated
       with each mesh that is concatenated */
    int max_vnew = 0, max_enew = 0, max_fnew = 0;
    for (i = 0; i < num; i++) {
      max_vnew += MESH_Num_Vertices(submeshes[i]);
      max_enew += MESH_Num_Edges(submeshes[i]);
      max_fnew += MESH_Num_Faces(submeshes[i]);
    }

    int num_new_verts = 0, num_new_edges = 0, num_new_faces = 0; 
    int *new_vert_gids = (int *) malloc(max_vnew*sizeof(int));
    int *new_edge_gids = (int *) malloc(max_enew*sizeof(int));
    int *new_face_gids = (int *) malloc(max_fnew*sizeof(int));

    List_ptr new_verts = List_New(max_vnew);
    List_ptr new_edges = List_New(max_enew);
    List_ptr new_faces = List_New(max_fnew);
  

    /* Now process each mesh and add a layer of ghost elements from
       each of them to the main partition */
       
    for (i = 0; i < num; i++) {
      submesh = submeshes[i];

      MAttrib_ptr vidatt = MAttrib_New(submesh, "tempvid", POINTER, MVERTEX);
      MAttrib_ptr eidatt = MAttrib_New(submesh, "tempeid", POINTER, MEDGE);
      MAttrib_ptr fidatt = MAttrib_New(submesh, "tempfid", POINTER, MFACE);

      idx = 0;
      while ((sub_mr = MESH_Next_Region(submesh, &idx))) {
        add_region = 0;

        /* Find matching vertices between submesh and main mesh */

        mrverts = MR_Vertices(sub_mr);
        nrv = List_Num_Entries(mrverts);
        for (j = 0; j < nrv; j++) {
          sub_mv = List_Entry(mrverts,j);

          MEnt_Get_AttVal(sub_mv, &vidatt, &ival, &rval, &mv);

          if (mv) {
            int on_parbndry=0;
            MEnt_Get_AttVal(mv, &parbndryatt, &on_parbndry, &rval, &pval);
            if (on_parbndry)
              add_region = 1; 
          } else {

            /* Does the global ID of this vertex of the sub mesh region
             * match the global ID of a boundary vertex in the main
             * mesh? */
            
            global_id = MV_GlobalID(sub_mv);
            loc = (int *) bsearch(&global_id, parbndry_vert_gids, num_parbndry_verts, sizeof(int),
                                  compareINT);
            if (loc) {
              add_region = 1; 
              iloc = loc - parbndry_vert_gids;
              mv = List_Entry(parbndry_verts,iloc); 
              /* here set the ghost vertex property, only necessary when the input submeshes are not consistent */
              if(MV_PType(mv) == PGHOST && MV_PType(sub_mv) != PGHOST) {
                MV_Set_GEntDim(mv,MV_GEntDim(sub_mv));
                MV_Set_GEntID(mv,MV_GEntID(sub_mv));
              }
              
              MEnt_Set_AttVal(sub_mv, vidatt, 0, 0.0, mv);
            }
          }
        }
        List_Delete(mrverts);

        /* Find matching edges between submesh and main mesh */

        mredges = MR_Edges(sub_mr);
        nre = List_Num_Entries(mredges);
        for (j = 0; j < nre; j++) {
          sub_me = List_Entry(mredges,j);
          
          /* Does the edge already have a counterpart in the main mesh? */
          MEnt_Get_AttVal(sub_me, eidatt, &ival, &rval, &me);

          if (!me) {
            /* Does the global ID of this edge of the sub mesh region
             * match the global ID of a boundary edge in the main
             * mesh? */
            
            global_id = ME_GlobalID(sub_me);
            loc = (int *) bsearch(&global_id, parbndry_edge_gids, num_parbndry_edges, sizeof(int),
                                  compareINT);
            if (loc) {
              add_region = 1; 
              iloc = loc - parbndry_edge_gids;
              me = List_Entry(parbndry_edges,iloc); 
              /* here set the ghost edge property, only necessary when the input submeshes are not consistent */
              if(ME_PType(me) == PGHOST && ME_PType(sub_me) != PGHOST) {
                ME_Set_GEntDim(me,ME_GEntDim(sub_me));
                ME_Set_GEntID(me,ME_GEntID(sub_me));
              }

              MEnt_Set_AttVal(sub_me, eidatt, 0, 0.0, me);
            }
          }
        }
        List_Delete(mredges);
          
        /* Find matching faces between submesh and main mesh */

        mrfaces = MR_Faces(sub_mr);
        nrf = List_Num_Entries(mrfaces);
        for (j = 0; j < nrf; j++) {
          sub_mf = List_Entry(mrfaces,j);

          MEnt_Get_AttVal(sub_mf, fidatt, &ival, &rval, &mf);

          if (!mf) {
            /* Does the global ID of this face of the sub mesh region
             * match the global ID of a boundary face in the main
             * mesh? */
            
            global_id = MF_GlobalID(sub_mf);
            loc = (int *) bsearch(&global_id, parbndry_face_gids, num_parbndry_faces, sizeof(int),
                                  compareINT);
            if (loc) {
              iloc = loc - parbndry_face_gids;
              mf = List_Entry(parbndry_faces,iloc); 
              /* here set the ghost edge property, only necessary when the input submeshes are not consistent */
              if (MF_PType(mf) == PGHOST && MF_PType(sub_mf) != PGHOST) {
                MF_Set_GEntDim(mf,MF_GEntDim(sub_mf));
                MF_Set_GEntID(mf,MF_GEntID(sub_mf));
              }

              MEnt_Set_AttVal(sub_mf, fidatt, 0, 0.0, mf);
            }
          }
        }

        if (!add_region) {
          List_Delete(mrfaces);
          continue;
        }
        
        new_mr = MR_New(mesh);                  /* add region */
        MR_Set_GEntDim(new_mr,MR_GEntDim(sub_mr));
        MR_Set_GEntID(new_mr,MR_GEntID(sub_mr));
        MR_Set_PType(new_mr,PGHOST);
        MR_Set_MasterParID(new_mr,MR_MasterParID(sub_mr));
        MR_Set_GlobalID(new_mr,MR_GlobalID(sub_mr));
	
        nrf = List_Num_Entries(mrfaces);
        int i2;
        for(i2 = 0; i2 < nrf; i2++) {
          sub_mf = List_Entry(mrfaces,i2);
          global_id = MF_GlobalID(sub_mf);
          rfdirs[i2] = MR_FaceDir_i(sub_mr,i2) == 1 ? 1 : 0;

          new_mf = NULL;
          MEnt_Get_AttVal(sub_mf, fidatt, &ival, &rval, &new_mf);

          if (!new_mf) {
            /* search in the ghost layer if another face with
             * this global ID has been added */
            loc = (int *) bsearch(&global_id, new_face_gids, num_new_faces,
                                  sizeof(int), compareINT);
            if (loc) {
              iloc = loc - new_face_gids;
              new_mf = List_Entry(new_faces, iloc);
              MEnt_Set_AttVal(sub_mf, fidatt, 0, 0.0, new_mf);
            }
          }

          if (new_mf) {
            List_ptr mfverts = MF_Vertices(sub_mf,1,0);
            int fvgid0[2];
            fvgid0[0] = MF_GlobalID(List_Entry(mfverts,0));
            fvgid0[1] = MF_GlobalID(List_Entry(mfverts,1));
            List_Delete(mfverts);

            mfverts = MF_Vertices(new_mf,1,0);
            int nfv = List_Num_Entries(mfverts);
            int fvgid1[MAXPV2];
            for (j = 0; j < nfv; j++)
              fvgid1[j] = MF_GlobalID(List_Entry(mfverts,j));
            List_Delete(mfverts);

            for (j = 0; j < nfv; j++) {
              if (fvgid1[j] == fvgid0[0]) {
                if (fvgid1[(j+nfv-1)%nfv] == fvgid0[1]) /* reverse dir */
                  rfdirs[i2] = !rfdirs[i2];
                break;
              }
            }                  
          }
          else {  /* add a new face to main mesh */
            new_mf = MF_New(mesh); /* add face */
            MF_Set_GEntDim(new_mf,MF_GEntDim(sub_mf));
            MF_Set_GEntID(new_mf,MF_GEntID(sub_mf));
            MF_Set_PType(new_mf,PGHOST);
            MF_Set_MasterParID(new_mf,MF_MasterParID(sub_mf));
            MF_Set_GlobalID(new_mf,MF_GlobalID(sub_mf));
	    
            MEnt_Set_AttVal(sub_mf, fidatt, 0, 0.0, new_mf);
            List_Add(new_faces, new_mf);
	    
            mfedges = MF_Edges(sub_mf,1,0);
            nfe = List_Num_Entries(mfedges);
            for(j = 0; j < nfe; j++) {
              sub_me = List_Entry(mfedges,j);
              global_id = ME_GlobalID(sub_me);
              
              fedirs[j] = MF_EdgeDir_i(sub_mf,j) == 1 ? 1 : 0;

              new_me = NULL;
              MEnt_Get_AttVal(sub_me, eidatt, &ival, &rval, &new_me);

              if (!new_me) {
                /* search in the ghost layer if another edge with
                 * this global ID has been added */
                loc = (int *) bsearch(&global_id, new_edge_gids, num_new_edges,
                                      sizeof(int), compareINT);
                if (loc) {
                  iloc = loc - new_edge_gids;
                  new_me = List_Entry(new_edges, iloc);
                  MEnt_Set_AttVal(sub_me, eidatt, 0, 0.0, new_me);
                }
              }
              
              if (new_me) {
                if(MV_GlobalID(ME_Vertex(new_me,0)) != MV_GlobalID(ME_Vertex(sub_me,0)))
                  fedirs[j] = 1 - fedirs[j];  /* if the edge dir is not the same, reverse the edge dir */
	      
              } else {  /* add a new edge to main mesh */
                new_me = ME_New(mesh);      /* add new edge and copy information */
                ME_Set_GEntDim(new_me,ME_GEntDim(sub_me));
                ME_Set_GEntID(new_me,ME_GEntID(sub_me));
                ME_Set_PType(new_me,PGHOST);
                ME_Set_MasterParID(new_me,ME_MasterParID(sub_me));
                ME_Set_GlobalID(new_me,ME_GlobalID(sub_me));
		
                MEnt_Set_AttVal(sub_me, eidatt, 0, 0.0, new_me);
                List_Add(new_edges, new_me);

                for(k = 0; k < 2; k++) {
                  sub_mv = ME_Vertex(sub_me,k);
                  global_id = MV_GlobalID(sub_mv);

                  new_mv = NULL;
                  MEnt_Get_AttVal(sub_mv, vidatt, &ival, &rval, &new_mv);

                  if (!new_mv) {
                    /* search in the ghost layer if another vertex with
                     * this global ID has been added */
                    loc = (int *) bsearch(&global_id, new_vert_gids, num_new_verts,
                                          sizeof(int), compareINT);
                    if (loc) {
                      iloc = loc - new_vert_gids;
                      new_mv = List_Entry(new_verts, iloc);
                      MEnt_Set_AttVal(sub_mv, vidatt, 0, 0.0, new_mv);
                    }
                  }
              
                  if (!new_mv) {  /* add new vertex to main mesh */
                    new_mv = MV_New(mesh);  /* add new vertex and copy information */
                    MV_Set_GEntDim(new_mv,MV_GEntDim(sub_mv));
                    MV_Set_GEntID(new_mv,MV_GEntID(sub_mv));
                    MV_Set_PType(new_mv,PGHOST);
                    MV_Set_MasterParID(new_mv,MV_MasterParID(sub_mv));
                    MV_Set_GlobalID(new_mv,MV_GlobalID(sub_mv));
                    MV_Coords(sub_mv,coor);
                    MV_Set_Coords(new_mv,coor);
		    
                    MEnt_Set_AttVal(sub_mv, vidatt, 0, 0.0, new_mv);
                    List_Add(new_verts, new_mv);
                  }
                  ME_Set_Vertex(new_me,k,new_mv);  /* set edge-vertex */
                }
              }							
              fedges[j] = new_me;
            }
            MF_Set_Edges(new_mf,nfe,fedges,fedirs); /* set face-edge */
            List_Delete(mfedges);
          }
          rfaces[i2] = new_mf;
        }
        MR_Set_Faces(new_mr,nrf,rfaces,rfdirs); /* set region-face */

        List_Delete(mrfaces);
      }

      idx = 0;
      while ((sub_mv = MESH_Next_Vertex(submesh, &idx)))
	MEnt_Rem_AttVal(sub_mv, vidatt);
      MAttrib_Delete(vidatt);
      idx = 0;
      while ((sub_me = MESH_Next_Edge(submesh, &idx)))
	MEnt_Rem_AttVal(sub_me, eidatt);
      MAttrib_Delete(eidatt);
      idx = 0;
      while ((sub_mf = MESH_Next_Face(submesh, &idx)))
	MEnt_Rem_AttVal(sub_mf, fidatt);
      MAttrib_Delete(fidatt);

      /* Sort the added entity lists by GlobalID */
      num_new_faces = List_Num_Entries(new_faces);
      List_Sort(new_faces, num_new_faces, sizeof(MFace_ptr), compareGlobalID);
      for (j = 0; j < num_new_faces; j++)
        new_face_gids[j] = MF_GlobalID(List_Entry(new_faces, j));

      num_new_edges = List_Num_Entries(new_edges);
      List_Sort(new_edges, num_new_edges, sizeof(MEdge_ptr), compareGlobalID);
      for (j = 0; j < num_new_edges; j++)
        new_edge_gids[j] = ME_GlobalID(List_Entry(new_edges, j));

      num_new_verts = List_Num_Entries(new_verts);
      List_Sort(new_verts, num_new_verts, sizeof(MVertex_ptr), compareGlobalID);
      for (j = 0; j < num_new_verts; j++)
        new_vert_gids[j] = MV_GlobalID(List_Entry(new_verts, j));
      
    }      

    idx = 0;
    while ((mv = List_Next_Entry(parbndry_verts, &idx)))
      MEnt_Rem_AttVal(mv, parbndryatt);
    MAttrib_Delete(parbndryatt);
    
    List_Delete(parbndry_faces);
    List_Delete(parbndry_edges);
    List_Delete(parbndry_verts);
    List_Delete(new_faces);
    List_Delete(new_edges);
    List_Delete(new_verts);

    free(parbndry_vert_gids);
    free(parbndry_edge_gids);
    free(parbndry_face_gids);
    free(new_face_gids);
    free(new_edge_gids);
    free(new_vert_gids);
    free(fedges);
    free(fedirs);
    free(rfaces);
    free(rfdirs);

    return 1;
  }
Ejemplo n.º 2
0
  int MESH_Update_ParallelAdj(Mesh_ptr mesh, MSTK_Comm comm) {
  int i, idx, nv, ne, nf, nr, local_ov_num[4];
  MVertex_ptr mv;
  MEdge_ptr me;
  MFace_ptr mf;
  MRegion_ptr mr;
  MType mtype;

  int myprtn, numprtns;
  MPI_Comm_rank(comm,&myprtn);
  MPI_Comm_size(comm,&numprtns);

  if (numprtns == 1) return 1;
  
  /* set ghost adjacencies */
  idx = 0;
  while ((mv = MESH_Next_GhostVertex(mesh,&idx)))
    MESH_Flag_Has_Ghosts_From_Prtn(mesh,MV_MasterParID(mv),MVERTEX);
  idx = 0;
  while ((me = MESH_Next_GhostEdge(mesh,&idx)))
    MESH_Flag_Has_Ghosts_From_Prtn(mesh,ME_MasterParID(me),MEDGE);
  idx = 0;
  while ((mf = MESH_Next_GhostFace(mesh,&idx)))
    MESH_Flag_Has_Ghosts_From_Prtn(mesh,MF_MasterParID(mf),MFACE);
  idx = 0;
  while ((mr = MESH_Next_GhostRegion(mesh,&idx)))
    MESH_Flag_Has_Ghosts_From_Prtn(mesh,MR_MasterParID(mr),MREGION);


  /* derive which processors this processor has overlaps with */

  int *local_par_adj = (int *) malloc(numprtns*sizeof(int));
  int *global_par_adj = (int *) malloc(numprtns*numprtns*sizeof(int));

  for (i = 0; i < numprtns; i++) {
    local_par_adj[i] = 0;

    for (mtype = MVERTEX; mtype <= MREGION; mtype++) {
      int j = MESH_Has_Ghosts_From_Prtn(mesh,i,mtype);
      local_par_adj[i] |= j<<(2*mtype);
    }
  }
     
  /* At this point, it is assumed that this processor ('prtn') has
     knowledge of all the processors that it has ghost entities from
     and what type of entities they are. We do an MPI_Allgather so
     that the processor can find out the reverse info, i.e., which
     processors are expecting ghost entities from this processor and
     what type of entities. This info then goes in as the overlap
     entity info for this processor */
  for (i = 0; i < numprtns*numprtns; i++) global_par_adj[i] = 0;
  MPI_Allgather(local_par_adj,numprtns,MPI_INT,global_par_adj,numprtns,MPI_INT,comm);

  /* Now set overlap adjacency flags */

  unsigned int ovnum = 0;
  unsigned int *prtnums = (unsigned int *) malloc(numprtns*sizeof(unsigned int));
  for (i = 0; i < numprtns; i++) {
    for (mtype = MVERTEX; mtype <= MREGION; mtype++) {

      int j = global_par_adj[i*numprtns + myprtn] & 1<<(2*mtype);
      if (j)
        MESH_Flag_Has_Overlaps_On_Prtn(mesh,i,mtype);
    }
  }


  /* Right now the model we use is that every partition sends ALL its
     overlap entity data to any partition that asks for it */
  /* So, if a processor 'i' has ghosts from partition 'j', it needs to
     know the total number of overlap entities on partition 'j' in
     order to allocate sufficient receive buffers */

  int *global_ov_num = (int *) malloc(4*numprtns*sizeof(int));

  /* local overlap entity numbers */
  local_ov_num[0] = MESH_Num_OverlapVertices(mesh);
  local_ov_num[1] = MESH_Num_OverlapEdges(mesh);
  local_ov_num[2] = MESH_Num_OverlapFaces(mesh);
  local_ov_num[3] = MESH_Num_OverlapRegions(mesh);


  MPI_Allgather(local_ov_num,4,MPI_INT,global_ov_num,4,MPI_INT,comm);

  /* Set how many entities a partition can expect to receive from
     another partititon whether it is used on this partition or not */
  MESH_Init_Par_Recv_Info(mesh);
  for(i = 0; i < numprtns; i++) {
    if (MESH_Has_Ghosts_From_Prtn(mesh,i,MANYTYPE)) {
      for (mtype = MVERTEX; mtype <= MREGION; mtype++) 
        MESH_Set_Num_Recv_From_Prtn(mesh,i,mtype,global_ov_num[4*i+mtype]);
    }
  }

  free(global_ov_num);
  free(local_par_adj);
  free(global_par_adj);
  free(prtnums);

  MESH_Mark_ParallelAdj_Current(mesh);

 return 1;
}
Ejemplo n.º 3
0
  int MESH_Send_NonVertexEntities_FN(Mesh_ptr mesh, int torank, MSTK_Comm comm,
                           int *numreq, int *maxreq, MPI_Request **requests,
                           int *numptrs2free, int *maxptrs2free,
                           void ***ptrs2free) {
    int i, j, nv, ne, nf, nr;
    int nevs, nfes, nrfs, nfe, nrv, nrf, dir;
    int maxnfe, maxnrf;
    int *mesh_info;
    int *list_edge=NULL, *list_face=NULL, *list_region=NULL;
    MVertex_ptr mv;
    MEdge_ptr me;
    MFace_ptr mf;
    MRegion_ptr mr;
    List_ptr mfedges, mrfaces, mrverts;
    RepType rtype;
    double coor[3];
    MPI_Request mpirequest;

    if (requests == NULL)
      MSTK_Report("MESH_Surf_SendMesh","MPI requests array is NULL",MSTK_FATAL);

    if (*maxreq == 0) {
      *maxreq = 25;
      *requests = (MPI_Request *) malloc(*maxreq*sizeof(MPI_Request));
      *numreq = 0;
    }
    else if (*maxreq < (*numreq) + 13) {
      *maxreq = 2*(*maxreq) + 11;
      *requests = (MPI_Request *) realloc(*requests,*maxreq*sizeof(MPI_Request));
    }
  

    ne = MESH_Num_Edges(mesh);
    nf = MESH_Num_Faces(mesh);
    nr = MESH_Num_Regions(mesh);

    /* some other known quantitites - 5 items per edge (2 for verts
       and 3 for extra data), maxnfe+4 items per face (1 for number of
       edges, maxnfe for edge indices, anad 3 for extra data),
       maxnrf+4 items per region (1 for number of faces, maxnrf for
       face indices and 3 for extra data */


    maxnfe = 0;
    for (i = 0; i < nf; i++) {
      mf = MESH_Face(mesh,i);
      nfe = MF_Num_Edges(mf);
      if (nfe > maxnfe)
        maxnfe = nfe;
    }

    maxnrf = 0;
    for (i = 0; i < nr; i++) {
      mr = MESH_Region(mesh,i);
      nrf = MR_Num_Faces(mr);
      if (nrf > maxnrf)
        maxnrf = nrf;
    }

    // The amount of extra info we are sending and their meaning is obviously
    // known on the receiving side too. So nevs, nfes and nrfs can be 
    // calculated without us sending it


    nevs = (2+3)*ne;    
    nfes = (1 + maxnfe + 3)*nf;
    nrfs = (1 + maxnrf + 3)*nr;
    
    /* Reserve nevs spots for each edge */

    list_edge = (int *) malloc(5*ne*sizeof(int));

    nevs = 0;

    /* Store the vertex ids, then the 3 auxilliary data fields */

    for(i = 0; i < ne; i++) {
      me = MESH_Edge(mesh,i);
      list_edge[nevs]   = MV_ID(ME_Vertex(me,0));
      list_edge[nevs+1] = MV_ID(ME_Vertex(me,1));
      list_edge[nevs+2] = (ME_GEntID(me)<<3) | (ME_GEntDim(me));
      list_edge[nevs+3] = (ME_MasterParID(me) <<3) | (ME_OnParBoundary(me)<<2) | (ME_PType(me));
      list_edge[nevs+4] = ME_GlobalID(me);
      nevs += 5;
    }

    /* send detailed edge info */

    MPI_Isend(list_edge,nevs,MPI_INT,torank,torank,comm,&mpirequest);
    (*requests)[*numreq] = mpirequest;
    (*numreq)++;
  

    /* Reserve nfes spots for each face */

    list_face = (int *) malloc(nfes*sizeof(int));

    nfes = 0;

    /* first store nfe, then the edge ids, then the 3 auxilliary data fields */

    for(i = 0; i < nf; i++) {
      mf = MESH_Face(mesh,i);
      mfedges = MF_Edges(mf,1,0);
      nfe = List_Num_Entries(mfedges);
      list_face[nfes] = nfe;
      for(j = 0; j < nfe; j++) {
        dir = MF_EdgeDir_i(mf,j) ? 1 : -1;
        list_face[nfes+j+1] = dir*ME_ID(List_Entry(mfedges,j));
      }
      list_face[nfes+nfe+1] = (MF_GEntID(mf)<<3) | (MF_GEntDim(mf));
      list_face[nfes+nfe+2] = (MF_MasterParID(mf)<<3) | (MF_OnParBoundary(mf)<<2) | (MF_PType(mf));
      list_face[nfes+nfe+3] = MF_GlobalID(mf);
      nfes += (nfe + 4);
      List_Delete(mfedges);
    }


    /* send detailed face info */

    MPI_Isend(list_face,nfes,MPI_INT,torank,torank,comm,&mpirequest);
    (*requests)[*numreq] = mpirequest;
    (*numreq)++;

    
    if (nr) {

      list_region = (int *) malloc(nrfs*sizeof(int));
      
      nrfs = 0;
      
      /* first store nrf, then the face ids, then the 3 auxilliary data fields */
      
      for(i = 0; i < nr; i++) {
        mr = MESH_Region(mesh,i);
        mrfaces = MR_Faces(mr);
        nrf = List_Num_Entries(mrfaces);
        list_region[nrfs] = nrf;
        for(j = 0; j < nrf; j++) {
          dir = MR_FaceDir_i(mr,j) == 1 ? 1 : -1;
          list_region[nrfs+j+1] = dir*MF_ID(List_Entry(mrfaces,j));
        }
        list_region[nrfs+nrf+1] = (MR_GEntID(mr)<<3) | (MR_GEntDim(mr));
        list_region[nrfs+nrf+2] = (MR_MasterParID(mr)<<3) | (MR_PType(mr)); /* MR_PType is 2 bits; 3 bit is 0 */
        list_region[nrfs+nrf+3] = MR_GlobalID(mr);
        nrfs += (nrf + 4);
        List_Delete(mrfaces);
      }
      
      /* send detailed region info */
      
      MPI_Isend(list_region,nrfs,MPI_INT,torank,torank,comm,&mpirequest);
      (*requests)[*numreq] = mpirequest;
      (*numreq)++;
      
    }
      

    /* collect allocated memory so it can be freed in a higher level
       routine after MPI_Waitall or MPI_Test has ensured that the send
       has been completed */

    if (ptrs2free == NULL) 
      MSTK_Report("MESH_Surf_SendMesh_FN","ptrs2free array is NULL",MSTK_FATAL);

    int nptrs = 3;

    if (*maxptrs2free == 0) {
      *maxptrs2free = 25;
      *ptrs2free = (void **) malloc(*maxptrs2free*sizeof(void *));
      *numptrs2free = 0;
    }
    else if (*maxptrs2free < (*numptrs2free) + nptrs) {
      *maxptrs2free = 2*(*maxptrs2free) + nptrs;
      *ptrs2free = (void **) realloc(*ptrs2free,(*maxptrs2free)*sizeof(void *));
    }

    if (ne)
      (*ptrs2free)[(*numptrs2free)++] = list_edge;
    if (nf)
      (*ptrs2free)[(*numptrs2free)++] = list_face;
    if (nr)
      (*ptrs2free)[(*numptrs2free)++] = list_region;

    return 1;
  }