CoupleMGen.cpp

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/*
 * Driver to test coupling online, without using IO hdf5 files
 * Will instantiate 2 different meshes, that cover the same domain; reports in the end the L
 * infinity norm of a field
 *
 * will report time to build the meshes, instantiate coupler, locate points and interpolate
 * M and K are options for number of parts in x and z directions
 *
 * partitions are ordered lexicographically, (MxNxK)
 *
 * it needs to be np = MxNxK
 *
 * if M==K, then the partitions are perfectly aligned
 *
 * the second mesh is ordered (KxNxM), so if you want them to not be perfectly aligned, make M and
 * K different
 *
 * for example, run with
 * M = 16, N=K=1, will verify slabs
 *
 * -b controls the number of elements in each partition
 *
 * example
 *
 * mpiexec -np 16 CoupleMGen -K 4 -N 4
 *
 * Right now, to build, it needs to install MOAB; coupler is harder if not installed (would need to
 * add
 * ../tools/mbcoupler , etc, to include and lib paths)
 *
 *
 */
// MOAB includes
#include "moab/ParallelComm.hpp"
#include "MBParallelConventions.h"
#include "moab/Core.hpp"
#include "mbcoupler/Coupler.hpp"
#include "moab_mpi.h"
#include "mbcoupler/ElemUtil.hpp"
#include "moab/MeshGeneration.hpp"
#include "moab/ProgOptions.hpp"
 
using namespace moab;
using std::string;
 
double physField( double x, double y, double z )
{
 
 double out = sin( M_PI * x ) * cos( M_PI * y ) * sin( M_PI * z );
 
 return out;
}
 
int main( int argc, char* argv[] )
{
 int proc_id = 0, size = 1;
 
 MPI_Init( &argc, &argv );
 MPI_Comm_rank( MPI_COMM_WORLD, &proc_id );
 MPI_Comm_size( MPI_COMM_WORLD, &size );
 
 Core mcore;
 Interface* mb = &mcore;
 EntityHandle fileset1, fileset2; // for 2 different meshes
 MeshGeneration::BrickOpts opts;
 // default options
 opts.A = opts.B = opts.C = 1;
 opts.M = opts.N = opts.K = 1;
 opts.blockSize = 4;
 opts.xsize = opts.ysize = opts.zsize = 1.;
 opts.ui = CartVect( 1., 0, 0. );
 opts.uj = CartVect( 0., 1., 0. );
 opts.uk = CartVect( 0., 0., 1. );
 opts.newMergeMethod = opts.quadratic = opts.keep_skins = opts.tetra = false;
 opts.adjEnts = opts.parmerge = false;
 opts.GL = 0;
 
 ProgOptions popts;
 
 popts.addOpt< int >( string( "blockSize,b" ), string( "Block size of mesh (default=4)" ), &opts.blockSize );
 popts.addOpt< int >( string( "xproc,M" ), string( "Number of processors in x dir (default=1)" ), &opts.M );
 popts.addOpt< int >( string( "yproc,N" ), string( "Number of processors in y dir (default=1)" ), &opts.N );
 popts.addOpt< int >( string( "zproc,K" ), string( "Number of processors in z dir (default=1)" ), &opts.K );
 
 popts.addOpt< int >( string( "xblocks,A" ), string( "Number of blocks on a task in x dir (default=2)" ), &opts.A );
 popts.addOpt< int >( string( "yblocks,B" ), string( "Number of blocks on a task in y dir (default=2)" ), &opts.B );
 popts.addOpt< int >( string( "zblocks,C" ), string( "Number of blocks on a task in x dir (default=2)" ), &opts.C );
 
 popts.addOpt< double >( string( "xsize,x" ), string( "Total size in x direction (default=1.)" ), &opts.xsize );
 popts.addOpt< double >( string( "ysize,y" ), string( "Total size in y direction (default=1.)" ), &opts.ysize );
 popts.addOpt< double >( string( "zsize,z" ), string( "Total size in z direction (default=1.)" ), &opts.zsize );
 
 popts.addOpt< void >( "newMerge,w", "use new merging method", &opts.newMergeMethod );
 
 popts.addOpt< void >( "quadratic,q", "use hex 27 elements", &opts.quadratic );
 
 popts.addOpt< void >( "keep_skins,k", "keep skins with shared entities", &opts.keep_skins );
 
 popts.addOpt< void >( "tetrahedrons,t", "generate tetrahedrons", &opts.tetra );
 
 popts.addOpt< void >( "faces_edges,f", "create all faces and edges", &opts.adjEnts );
 
 popts.addOpt< int >( string( "ghost_layers,g" ), string( "Number of ghost layers (default=0)" ), &opts.GL );
 
 popts.addOpt< void >( "parallel_merge,p", "use parallel mesh merge, not vertex ID based merge", &opts.parmerge );
 
 Coupler::Method method = Coupler::LINEAR_FE;
 
 double toler = 1.e-6;
 popts.addOpt< double >( string( "eps,e" ), string( "tolerance for coupling, used in locating points" ), &toler );
 
 bool writeMeshes = false;
 popts.addOpt< void >( "print,p", "write meshes", &writeMeshes );
 
 popts.parseCommandLine( argc, argv );
 
 double start_time = MPI_Wtime();
 
 ErrorCode rval = mb->create_meshset( MESHSET_SET, fileset1 );MB_CHK_ERR( rval );
 rval = mb->create_meshset( MESHSET_SET, fileset2 );MB_CHK_ERR( rval );
 
 ParallelComm* pc1 = new ParallelComm( mb, MPI_COMM_WORLD );
 MeshGeneration* mgen1 = new MeshGeneration( mb, pc1, fileset1 );
 
 rval = mgen1->BrickInstance( opts );MB_CHK_ERR( rval ); // this will generate first mesh on fileset1
 
 double instance_time = MPI_Wtime();
 double current = instance_time;
 if( !proc_id ) std::cout << " instantiate first mesh " << instance_time - start_time << "\n";
 // set an interpolation tag on source mesh, from phys field
 std::string interpTag( "interp_tag" );
 Tag tag;
 rval = mb->tag_get_handle( interpTag.c_str(), 1, MB_TYPE_DOUBLE, tag, MB_TAG_CREAT | MB_TAG_DENSE );MB_CHK_ERR( rval );
 
 Range src_elems;
 rval = pc1->get_part_entities( src_elems, 3 );MB_CHK_ERR( rval );
 Range src_verts;
 rval = mb->get_connectivity( src_elems, src_verts );MB_CHK_ERR( rval );
 for( Range::iterator vit = src_verts.begin(); vit != src_verts.end(); ++vit )
 {
 EntityHandle vert = *vit; //?
 
 double vertPos[3];
 mb->get_coords( &vert, 1, vertPos );
 
 double fieldValue = physField( vertPos[0], vertPos[1], vertPos[2] );
 
 rval = mb->tag_set_data( tag, &vert, 1, &fieldValue );MB_CHK_ERR( rval );
 }
 
 double setTag_time = MPI_Wtime();
 if( !proc_id ) std::cout << " set tag " << setTag_time - current;
 current = instance_time;
 // change some options, so it is a different mesh
 int tmp1 = opts.K;
 opts.K = opts.M;
 opts.M = tmp1; // swap (opts.K, opts.M)
 opts.tetra = !opts.tetra;
 opts.blockSize++;
 
 ParallelComm* pc2 = new ParallelComm( mb, MPI_COMM_WORLD );
 MeshGeneration* mgen2 = new MeshGeneration( mb, pc2, fileset2 );
 
 rval = mgen2->BrickInstance( opts );MB_CHK_ERR( rval ); // this will generate second mesh on fileset2
 
 double instance_second = MPI_Wtime();
 if( !proc_id ) std::cout << " instance second mesh" << instance_second - current << "\n";
 current = instance_second;
 
 // test the sets are fine
 if( writeMeshes )
 {
 rval = mb->write_file( "mesh1.h5m", 0, ";;PARALLEL=WRITE_PART;CPUTIME;PARALLEL_COMM=0;", &fileset1, 1 );MB_CHK_SET_ERR( rval, "Can't write in parallel mesh 1" );
 rval = mb->write_file( "mesh2.h5m", 0, ";;PARALLEL=WRITE_PART;CPUTIME;PARALLEL_COMM=1;", &fileset2, 1 );MB_CHK_SET_ERR( rval, "Can't write in parallel mesh 1" );
 double write_files = MPI_Wtime();
 if( !proc_id ) std::cout << " write files " << write_files - current << "\n";
 current = write_files;
 }
 
 // Instantiate a coupler, which also initializes the tree
 Coupler mbc( mb, pc1, src_elems, 0 );
 
 double instancecoupler = MPI_Wtime();
 if( !proc_id ) std::cout << " instance coupler " << instancecoupler - current << "\n";
 current = instancecoupler;
 
 // Get points from the target mesh to interpolate
 // We have to treat differently the case when the target is a spectral mesh
 // In that case, the points of interest are the GL points, not the vertex nodes
 std::vector< double > vpos; // This will have the positions we are interested in
 int numPointsOfInterest = 0;
 
 Range targ_elems;
 Range targ_verts;
 
 // First get all vertices adj to partition entities in target mesh
 rval = pc2->get_part_entities( targ_elems, 3 );MB_CHK_ERR( rval );
 
 rval = mb->get_adjacencies( targ_elems, 0, false, targ_verts, Interface::UNION );MB_CHK_ERR( rval );
 Range tmp_verts;
 // Then get non-owned verts and subtract
 rval = pc2->get_pstatus_entities( 0, PSTATUS_NOT_OWNED, tmp_verts );MB_CHK_ERR( rval );
 targ_verts = subtract( targ_verts, tmp_verts );
 // get position of these entities; these are the target points
 numPointsOfInterest = (int)targ_verts.size();
 vpos.resize( 3 * targ_verts.size() );
 rval = mb->get_coords( targ_verts, &vpos[0] );MB_CHK_ERR( rval );
 // Locate those points in the source mesh
 // std::cout<<"rank "<< proc_id<< " points of interest: " << numPointsOfInterest << "\n";
 rval = mbc.locate_points( &vpos[0], numPointsOfInterest, 0, toler );MB_CHK_ERR( rval );
 
 double locatetime = MPI_Wtime();
 if( !proc_id ) std::cout << " locate points: " << locatetime - current << "\n";
 current = locatetime;
 
 // Now interpolate tag onto target points
 std::vector< double > field( numPointsOfInterest );
 
 rval = mbc.interpolate( method, interpTag, &field[0] );MB_CHK_ERR( rval );
 
 // compare with the actual phys field
 double err_max = 0;
 for( int i = 0; i < numPointsOfInterest; i++ )
 {
 double trval = physField( vpos[3 * i], vpos[3 * i + 1], vpos[3 * i + 2] );
 double err2 = fabs( trval - field[i] );
 if( err2 > err_max ) err_max = err2;
 }
 
 double interpolateTime = MPI_Wtime();
 if( !proc_id ) std::cout << " interpolate points: " << interpolateTime - current << "\n";
 current = interpolateTime;
 
 double gerr;
 MPI_Allreduce( &err_max, &gerr, 1, MPI_DOUBLE, MPI_MAX, MPI_COMM_WORLD );
 if( 0 == proc_id ) std::cout << "max err " << gerr << "\n";
 
 delete mgen1;
 delete mgen2;
 
 MPI_Finalize();
 
 return 0;
}