netgen/libsrc/meshing/paralleltop.cpp
Joachim Schoeberl edd41fbf68 parallel tuninig
2011-07-21 14:45:41 +00:00

897 lines
21 KiB
C++

#ifdef PARALLEL
#include <meshing.hpp>
#include "paralleltop.hpp"
namespace netgen
{
static MPI_Group MPI_HIGHORDER_WORLD;
static MPI_Comm MPI_HIGHORDER_COMM;
void MyMPI_ExchangeTable (TABLE<int> & send_verts,
TABLE<int> & recv_verts, int tag,
MPI_Comm comm = MPI_COMM_WORLD)
{
int ntasks, rank;
MPI_Comm_size(comm, &ntasks);
MPI_Comm_rank(comm, &rank);
Array<MPI_Request> requests;
for (int dest = 0; dest < ntasks; dest++)
if (dest != rank)
requests.Append (MyMPI_ISend (send_verts[dest], dest, tag, comm));
for (int i = 0; i < ntasks-1; i++)
{
MPI_Status status;
MPI_Probe (MPI_ANY_SOURCE, tag, comm, &status);
int size, src = status.MPI_SOURCE;
MPI_Get_count (&status, MPI_INT, &size);
recv_verts.SetEntrySize (src, size, sizeof(int));
requests.Append (MyMPI_IRecv (recv_verts[src], src, tag, comm));
}
MPI_Waitall (requests.Size(), &requests[0], MPI_STATUS_IGNORE);
}
void ParallelMeshTopology :: Reset ()
{
*testout << "ParallelMeshTopology::Reset" << endl;
if ( ntasks == 1 ) return;
int nvold = nv;
ne = mesh.GetNE();
nv = mesh.GetNV();
nseg = mesh.GetNSeg();
nsurfel = mesh.GetNSE();
ned = mesh.GetTopology().GetNEdges();
nfa = mesh.GetTopology().GetNFaces();
loc2distedge.ChangeSize (ned);
for (int i = 0; i < ned; i++)
if (loc2distedge[i].Size() == 0)
loc2distedge.Add (i, -1); // will be the global nr
loc2distface.ChangeSize (nfa);
for (int i = 0; i < nfa; i++)
if (loc2distface[i].Size() == 0)
loc2distface.Add (i, -1); // will be the global nr
if ( nvold == nv ) return;
SetNV(nv);
SetNE(ne);
}
ParallelMeshTopology :: ~ParallelMeshTopology ()
{
;
}
ParallelMeshTopology :: ParallelMeshTopology ( const netgen::Mesh & amesh )
: mesh(amesh)
{
ned = 0;
nfa = 0;
nv = 0;
ne = 0;
np = 0;
nseg = 0;
nsurfel = 0;
neglob = 0;
nvglob = 0;
nparel = 0;
coarseupdate = 0;
}
void ParallelMeshTopology :: Print() const
{
(*testout) << endl << "TOPOLOGY FOR PARALLEL MESHES" << endl << endl;
for ( int i = 1; i <= nv; i++ )
if ( IsExchangeVert (i) )
{
(*testout) << "exchange point " << i << ": global " << GetLoc2Glob_Vert(i) << endl;
for ( int dest = 0; dest < ntasks; dest ++)
if ( dest != id )
if ( GetDistantPNum( dest, i ) > 0 )
(*testout) << " p" << dest << ": " << GetDistantPNum ( dest, i ) << endl;
}
for ( int i = 1; i <= ned; i++ )
if ( IsExchangeEdge ( i ) )
{
int v1, v2;
mesh . GetTopology().GetEdgeVertices(i, v1, v2);
(*testout) << "exchange edge " << i << ": global vertices " << GetLoc2Glob_Vert(v1) << " "
<< GetLoc2Glob_Vert(v2) << endl;
for ( int dest = 0; dest < ntasks; dest++)
if ( GetDistantEdgeNum ( dest, i ) > 0 )
if ( dest != id )
(*testout) << " p" << dest << ": " << GetDistantEdgeNum ( dest, i ) << endl;
}
for ( int i = 1; i <= nfa; i++ )
if ( IsExchangeFace(i) )
{
Array<int> facevert;
mesh . GetTopology().GetFaceVertices(i, facevert);
(*testout) << "exchange face " << i << ": global vertices " ;
for ( int fi=0; fi < facevert.Size(); fi++)
(*testout) << GetLoc2Glob_Vert(facevert[fi]) << " ";
(*testout) << endl;
for ( int dest = 0; dest < ntasks; dest++)
if ( dest != id )
{
if ( GetDistantFaceNum ( dest, i ) >= 0 )
(*testout) << " p" << dest << ": " << GetDistantFaceNum ( dest, i ) << endl;
}
}
/*
for ( int i = 1; i < mesh.GetNE(); i++)
{
if ( !IsExchangeElement(i) ) continue;
Array<int> vert;
const Element & el = mesh.VolumeElement(i);
(*testout) << "parallel local element " << i << endl;
(*testout) << "vertices " ;
for ( int j = 0; j < el.GetNV(); j++)
(*testout) << el.PNum(j+1) << " ";
(*testout) << "is ghost " << IsGhostEl(i) << endl;
(*testout) << endl;
}
*/
}
int ParallelMeshTopology :: GetDistantPNum ( int proc, int locpnum ) const
{
if ( proc == 0 )
return loc2distvert[locpnum][0];
for (int i = 1; i < loc2distvert[locpnum].Size(); i += 2)
if ( loc2distvert[locpnum][i] == proc )
return loc2distvert[locpnum][i+1];
return -1;
}
int ParallelMeshTopology :: GetDistantFaceNum ( int proc, int locfacenum ) const
{
if ( proc == 0 )
return loc2distface[locfacenum-1][0];
for ( int i = 1; i < loc2distface[locfacenum-1].Size(); i+=2 )
if ( loc2distface[locfacenum-1][i] == proc )
return loc2distface[locfacenum-1][i+1];
return -1;
}
int ParallelMeshTopology :: GetDistantEdgeNum ( int proc, int locedgenum ) const
{
if ( proc == 0 )
return loc2distedge[locedgenum-1][0];
for ( int i = 1; i < loc2distedge[locedgenum-1].Size(); i+=2 )
if ( loc2distedge[locedgenum-1][i] == proc )
return loc2distedge[locedgenum-1][i+1];
return -1;
}
int ParallelMeshTopology :: GetDistantElNum ( int proc, int locelnum ) const
{
if ( proc == 0 )
return loc2distel[locelnum-1][0];
for ( int i = 1; i < loc2distel[locelnum-1].Size(); i+=2 )
if ( loc2distel[locelnum-1][i] == proc )
return loc2distel[locelnum-1][i+1];
return -1;
}
// gibt anzahl an distant pnums zurueck
// * pnums entspricht Array<int[2] >
int ParallelMeshTopology :: GetDistantPNums ( int locpnum, int * distpnums ) const
{
distpnums[0] = 0;
distpnums[1] = loc2distvert[locpnum][0];
for ( int i = 1; i < loc2distvert[locpnum].Size(); i++ )
distpnums[i+1] = loc2distvert[locpnum][i];
int size = loc2distvert[locpnum].Size() / 2 + 1;
return size;
}
int ParallelMeshTopology :: GetDistantFaceNums ( int locfacenum, int * distfacenums ) const
{
distfacenums[0] = 0;
distfacenums[1] = loc2distface[locfacenum-1][0];
for ( int i = 1; i < loc2distface[locfacenum-1].Size(); i++ )
distfacenums[i+1] = loc2distface[locfacenum-1][i];
int size = loc2distface[locfacenum-1].Size() / 2 + 1;
return size;
}
int ParallelMeshTopology :: GetDistantEdgeNums ( int locedgenum, int * distedgenums ) const
{
distedgenums[0] = 0;
distedgenums[1] = loc2distedge[locedgenum-1][0];
for ( int i = 1; i < loc2distedge[locedgenum-1].Size(); i++ )
distedgenums[i+1] = loc2distedge[locedgenum-1][i];
int size = loc2distedge[locedgenum-1].Size() / 2 + 1;
return size;
}
int ParallelMeshTopology :: GetDistantElNums ( int locelnum, int * distelnums ) const
{
distelnums[0] = 0;
distelnums[1] = loc2distel[locelnum-1][0];
for ( int i = 1; i < loc2distel[locelnum-1].Size(); i++ )
distelnums[i+1] = loc2distel[locelnum-1][i];
int size = loc2distel[locelnum-1].Size() / 2 + 1;
return size;
}
void ParallelMeshTopology :: SetDistantFaceNum ( int dest, int locnum, int distnum )
{
if ( dest == 0 )
{
loc2distface[locnum-1][0] = distnum;
return;
}
for ( int i = 1; i < loc2distface[locnum-1].Size(); i+=2 )
if ( loc2distface[locnum-1][i] == dest )
{
loc2distface[locnum-1][i+1] = distnum;
return;
}
loc2distface.Add(locnum-1, dest);
loc2distface.Add(locnum-1, distnum);
}
void ParallelMeshTopology :: SetDistantPNum ( int dest, int locnum, int distnum )
{
if ( dest == 0 )
{
loc2distvert[locnum][0] = distnum; // HERE
return;
}
for ( int i = 1; i < loc2distvert[locnum].Size(); i+=2 )
if ( loc2distvert[locnum][i] == dest )
{
loc2distvert[locnum][i+1] = distnum;
return;
}
loc2distvert.Add (locnum, dest);
loc2distvert.Add (locnum, distnum);
}
void ParallelMeshTopology :: SetDistantEdgeNum ( int dest, int locnum, int distnum )
{
if ( dest == 0 )
{
loc2distedge[locnum-1][0] = distnum;
return;
}
for ( int i = 1; i < loc2distedge[locnum-1].Size(); i+=2 )
if ( loc2distedge[locnum-1][i] == dest )
{
loc2distedge[locnum-1][i+1] = distnum;
return;
}
loc2distedge.Add (locnum-1, dest);
loc2distedge.Add (locnum-1, distnum);
}
void ParallelMeshTopology :: SetDistantEl ( int dest, int locnum, int distnum )
{
if ( dest == 0 )
{
loc2distel[locnum-1][0] = distnum;
return;
}
for ( int i = 1; i < loc2distel[locnum-1].Size(); i+=2 )
if ( loc2distel[locnum-1][i] == dest )
{
loc2distel[locnum-1][i+1] = distnum;
return;
}
loc2distel.Add (locnum-1, dest);
loc2distel.Add (locnum-1, distnum);
}
void ParallelMeshTopology :: SetDistantSurfEl ( int dest, int locnum, int distnum )
{
if ( dest == 0 )
{
loc2distsurfel[locnum-1][0] = distnum;
return;
}
for ( int i = 1; i < loc2distsurfel[locnum-1].Size(); i+=2 )
if ( loc2distsurfel[locnum-1][i] == dest )
{
loc2distsurfel[locnum-1][i+1] = distnum;
return;
}
loc2distsurfel.Add (locnum-1, dest);
loc2distsurfel.Add (locnum-1, distnum);
}
void ParallelMeshTopology :: SetDistantSegm ( int dest, int locnum, int distnum )
{
if ( dest == 0 )
{
loc2distsegm[locnum-1][0] = distnum;
return;
}
for (int i = 1; i < loc2distsegm[locnum-1].Size(); i+=2 )
if ( loc2distsegm[locnum-1][i] == dest )
{
loc2distsegm[locnum-1][i+1] = distnum;
return;
}
loc2distsegm.Add (locnum-1, dest);
loc2distsegm.Add (locnum-1, distnum);
}
void ParallelMeshTopology :: GetVertNeighbours ( int vnum, Array<int> & dests ) const
{
dests.SetSize(0);
int i = 1;
while ( i < loc2distvert[vnum].Size() )
{
dests.Append ( loc2distvert[vnum][i] );
i+=2;
}
}
void ParallelMeshTopology :: Update ()
{
ne = mesh.GetNE();
nv = mesh.GetNV();
nseg = mesh.GetNSeg();
nsurfel = mesh.GetNSE();
ned = mesh.GetTopology().GetNEdges();
nfa = mesh.GetTopology().GetNFaces();
}
void ParallelMeshTopology :: UpdateRefinement ()
{
;
}
void ParallelMeshTopology :: UpdateCoarseGridGlobal ()
{
if (id == 0)
PrintMessage ( 3, "UPDATE GLOBAL COARSEGRID STARTS" ); // JS
MPI_Group MPI_GROUP_WORLD;
int process_ranks[] = { 0 };
MPI_Comm_group (MPI_COMM_WORLD, &MPI_GROUP_WORLD);
MPI_Group_excl (MPI_GROUP_WORLD, 1, process_ranks, &MPI_HIGHORDER_WORLD);
MPI_Comm_create (MPI_COMM_WORLD, MPI_HIGHORDER_WORLD, &MPI_HIGHORDER_COMM);
int timer = NgProfiler::CreateTimer ("UpdateCoarseGridGlobal");
NgProfiler::RegionTimer reg(timer);
*testout << "ParallelMeshTopology :: UpdateCoarseGridGlobal" << endl;
const MeshTopology & topology = mesh.GetTopology();
Array<int> sendarray, recvarray;
nfa = topology . GetNFaces();
ned = topology . GetNEdges();
np = mesh . GetNP();
nv = mesh . GetNV();
ne = mesh . GetNE();
nseg = mesh.GetNSeg();
nsurfel = mesh.GetNSE();
// low order processor - save mesh partition
if ( id == 0 )
{
for ( int eli = 1; eli <= ne; eli++ )
loc2distel[eli-1][0] = eli;
for ( int i = 1; i <= mesh .GetNV(); i++)
loc2distvert[i][0] = i;
for ( int i = 0; i < mesh . GetNSeg(); i++)
loc2distsegm[i][0] = i+1;
for ( int i = 0; i < mesh . GetNSE(); i++)
loc2distsurfel[i][0] = i+1;
for ( int i = 0; i < topology .GetNEdges(); i++)
loc2distedge[i][0] = i+1;
for ( int i = 0; i < topology .GetNFaces(); i++)
loc2distface[i][0] = i+1;
}
if ( id == 0 )
{
sendarray.Append (nfa);
sendarray.Append (ned);
Array<int> edges, pnums, faces, elpnums;
sendarray.Append (ne);
for ( int el = 1; el <= ne; el++ )
{
topology.GetElementFaces (el, faces);
topology.GetElementEdges ( el, edges );
const Element & volel = mesh.VolumeElement (el);
int globeli = GetLoc2Glob_VolEl(el);
// cout << "el = " << el << ", globeli = " << globeli << endl;
sendarray. Append ( globeli );
sendarray. Append ( faces.Size() );
sendarray. Append ( edges.Size() );
sendarray. Append ( volel.GetNP() );
for ( int i = 0; i < faces.Size(); i++ )
sendarray. Append(faces[i] );
for ( int i = 0; i < edges.Size(); i++ )
sendarray. Append(edges[i] );
for ( int i = 0; i < volel.GetNP(); i++ )
if (id == 0)
sendarray. Append(volel[i] );
else
sendarray. Append(GetLoc2Glob_Vert (volel[i]));
}
sendarray.Append (nsurfel);
for (int el = 1; el <= nsurfel; el++)
{
topology.GetSurfaceElementEdges ( el, edges );
const Element2d & surfel = mesh.SurfaceElement (el);
sendarray. Append ( el );
sendarray. Append ( edges.Size() );
sendarray. Append ( surfel.GetNP() );
for ( int i = 0; i < edges.Size(); i++ )
sendarray. Append(edges[i] );
for ( int i = 0; i < surfel.GetNP(); i++ )
sendarray. Append(surfel[i] );
}
}
if (id == 0)
MyMPI_Bcast ( sendarray );
else
MyMPI_Bcast ( recvarray );
if (id != 0)
{
Array<int,1> glob2loc_el;
glob2loc_el.SetSize (neglob);
glob2loc_el = -1;
for ( int locel = 1; locel <= mesh.GetNE(); locel++)
glob2loc_el[GetLoc2Glob_VolEl(locel)] = locel;
int ii = 0;
nfaglob = recvarray[ii++];
nedglob = recvarray[ii++];
Array<int> faces, edges;
Array<int> pnums, globalpnums;
int recv_ne = recvarray[ii++];
for (int hi = 0; hi < recv_ne; hi++)
{
int globvolel = recvarray[ii++];
int distnfa = recvarray[ii++];
int distned = recvarray[ii++];
int distnp = recvarray[ii++];
int volel = glob2loc_el[globvolel];
if (volel != -1)
{
topology.GetElementFaces( volel, faces);
topology.GetElementEdges ( volel, edges);
const Element & volelement = mesh.VolumeElement (volel);
for ( int i = 0; i < faces.Size(); i++)
SetDistantFaceNum ( 0, faces[i], recvarray[ii++]);
for ( int i = 0; i < edges.Size(); i++)
SetDistantEdgeNum ( 0, edges[i], recvarray[ii++]);
for ( int i = 0; i < volelement.GetNP(); i++)
SetDistantPNum ( 0, volelement[i], recvarray[ii++]);
}
else
ii += distnfa + distned + distnp;
}
Array<int,1> glob2loc_sel;
int recv_nse = recvarray[ii++];
nseglob = recv_nse;
glob2loc_sel.SetSize (nseglob);
glob2loc_sel = -1;
for ( int locel = 1; locel <= mesh.GetNSE(); locel++)
glob2loc_sel[GetLoc2Glob_SurfEl(locel)] = locel;
for (int hi = 0; hi < recv_nse; hi++)
{
int globvolel = recvarray[ii++];
int distned = recvarray[ii++];
int distnp = recvarray[ii++];
int surfel = glob2loc_sel[globvolel];
if (surfel != -1)
{
topology.GetSurfaceElementEdges ( surfel, edges);
const Element2d & element = mesh.SurfaceElement (surfel);
for ( int i = 0; i < edges.Size(); i++)
SetDistantEdgeNum ( 0, edges[i], recvarray[ii++]);
for ( int i = 0; i < element.GetNP(); i++)
SetDistantPNum ( 0, element[i], recvarray[ii++]);
}
else
ii += distned + distnp;
}
}
if (id != 0)
{
*testout << "l2d - vert = " << loc2distvert << endl;
*testout << "l2d - edge = " << loc2distedge << endl;
*testout << "l2d - el = " << loc2distel << endl;
*testout << "l2d - sel = " << loc2distsurfel << endl;
}
coarseupdate = 1;
}
void ParallelMeshTopology :: UpdateCoarseGrid ()
{
static int timer = NgProfiler::CreateTimer ("UpdateCoarseGrid");
NgProfiler::RegionTimer reg(timer);
(*testout) << "UPDATE COARSE GRID PARALLEL TOPOLOGY " << endl;
if (id == 0)
PrintMessage (1, "UPDATE COARSE GRID PARALLEL TOPOLOGY ");
// find exchange edges - first send exchangeedges locnum, v1, v2
// receive distant distnum, v1, v2
// find matching
const MeshTopology & topology = mesh.GetTopology();
UpdateCoarseGridGlobal();
MPI_Barrier (MPI_COMM_WORLD);
if ( id == 0 )
{
return;
}
Array<int> sendarray, recvarray;
nfa = topology . GetNFaces();
ned = topology . GetNEdges();
np = mesh . GetNP();
nv = mesh . GetNV();
ne = mesh . GetNE();
nseg = mesh.GetNSeg();
nsurfel = mesh.GetNSE();
static int timerv = NgProfiler::CreateTimer ("UpdateCoarseGrid - ex vertices");
static int timere = NgProfiler::CreateTimer ("UpdateCoarseGrid - ex edges");
static int timerf = NgProfiler::CreateTimer ("UpdateCoarseGrid - ex faces");
Array<int,1> glob2loc;
Array<int> cnt_send(ntasks-1);
NgProfiler::StartTimer (timere);
// exchange edges
int maxedge = 0;
for (int edge = 1; edge <= ned; edge++)
maxedge = max (maxedge, GetDistantEdgeNum (0, edge));
glob2loc.SetSize (maxedge);
glob2loc = -1;
for (int edge = 1; edge <= ned; edge++)
glob2loc[GetDistantEdgeNum(0, edge)] = edge;
cnt_send = 0;
int v1, v2;
for (int edge = 1; edge <= ned; edge++)
{
topology.GetEdgeVertices (edge, v1, v2);
for (int dest = 1; dest < ntasks; dest++)
if (IsExchangeVert (dest, v1) &&
IsExchangeVert (dest, v2))
{
cnt_send[dest-1]+=2;
}
}
TABLE<int> send_edges(cnt_send);
for (int edge = 1; edge <= ned; edge++)
{
topology.GetEdgeVertices (edge, v1, v2);
for (int dest = 1; dest < ntasks; dest++)
{
if (IsExchangeVert (dest, v1) &&
IsExchangeVert (dest, v2))
{
send_edges.Add (dest-1, GetDistantEdgeNum(0, edge));
send_edges.Add (dest-1, edge);
}
}
}
// *testout << "send exchange edges: " << send_edges << endl;
TABLE<int> recv_edges(ntasks-1);
MyMPI_ExchangeTable (send_edges, recv_edges, MPI_TAG_MESH+9, MPI_HIGHORDER_COMM);
// *testout << "recv exchange edges: " << recv_edges << endl;
for (int sender = 1; sender < ntasks; sender ++)
if (id != sender)
{
FlatArray<int> recvarray = recv_edges[sender-1];
for (int ii = 0; ii < recvarray.Size(); )
{
int globe = recvarray[ii++];
int diste = recvarray[ii++];
if (globe <= maxedge)
{
int loce = glob2loc[globe];
if (loce != -1)
SetDistantEdgeNum (sender, loce, diste);
}
}
}
NgProfiler::StopTimer (timere);
MPI_Barrier (MPI_HIGHORDER_COMM);
if (mesh.GetDimension() == 3)
{
NgProfiler::StartTimer (timerf);
glob2loc.SetSize (nfaglob);
glob2loc = -1;
for (int loc = 1; loc <= nfa; loc++)
glob2loc[GetDistantFaceNum(0, loc)] = loc;
cnt_send = 0;
Array<int> verts;
for (int face = 1; face <= nfa; face++)
{
topology.GetFaceVertices (face, verts);
for (int dest = 1; dest < ntasks; dest++)
if (IsExchangeVert (dest, verts[0]) &&
IsExchangeVert (dest, verts[1]) &&
IsExchangeVert (dest, verts[2]))
{
cnt_send[dest-1]+=2;
}
}
TABLE<int> send_faces(cnt_send);
for (int face = 1; face <= nfa; face++)
{
topology.GetFaceVertices (face, verts);
for (int dest = 1; dest < ntasks; dest++)
{
if (IsExchangeVert (dest, verts[0]) &&
IsExchangeVert (dest, verts[1]) &&
IsExchangeVert (dest, verts[2]))
{
send_faces.Add (dest-1, GetDistantFaceNum(0, face));
send_faces.Add (dest-1, face);
}
}
}
TABLE<int> recv_faces(ntasks-1);
MyMPI_ExchangeTable (send_faces, recv_faces, MPI_TAG_MESH+8, MPI_HIGHORDER_COMM);
// *testout << "send exchange faces: " << send_faces << endl;
// *testout << "recv exchange faces: " << recv_faces << endl;
for (int sender = 1; sender < ntasks; sender ++)
if (id != sender)
{
FlatArray<int> recvarray = recv_faces[sender-1];
for (int ii = 0; ii < recvarray.Size(); )
{
int globf = recvarray[ii++];
int distf = recvarray[ii++];
int locf = glob2loc[globf];
// *testout << "set distant face, sender = " << sender << ", locf = " << locf << "; distf = " << distf << endl;
if (locf != -1)
SetDistantFaceNum (sender, locf, distf);
}
}
NgProfiler::StopTimer (timerf);
}
// set which elements are where for the master processor
coarseupdate = 1;
}
void ParallelMeshTopology :: UpdateTopology ()
{
;
}
void ParallelMeshTopology :: SetNV ( const int anv )
{
*testout << "called setnv" << endl
<< "old size: " << loc2distvert.Size() << endl
<< "new size: " << anv << endl;
loc2distvert.ChangeSize (anv);
for (int i = 1; i <= anv; i++)
if (loc2distvert.EntrySize(i) == 0)
loc2distvert.Add (i, -1); // will be the global nr
nv = anv;
}
void ParallelMeshTopology :: SetNE ( const int ane )
{
loc2distel.ChangeSize (ane);
for (int i = 0; i < ane; i++)
if (loc2distel[i].Size() == 0)
loc2distel.Add (i, -1); // will be the global nr
ne = ane;
}
void ParallelMeshTopology :: SetNSE ( int anse )
{
loc2distsurfel.ChangeSize (anse);
for (int i = 0; i < anse; i++)
if (loc2distsurfel[i].Size() == 0)
loc2distsurfel.Add (i, -1); // will be the global nr
nsurfel = anse;
}
void ParallelMeshTopology :: SetNSegm ( int anseg )
{
loc2distsegm.ChangeSize (anseg);
for (int i = 0; i < anseg; i++)
if (loc2distsegm[i].Size() == 0)
loc2distsegm.Add (i, -1); // will be the global nr
nseg = anseg;
}
}
#endif