imoab_read_map.cpp

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/*
 * This imoab_read_map test will simulate coupling between 2 components
 * 2 meshes will be loaded from 2 files (src, tgt), and one map file
 * after the map is read, in parallel, on coupler pes, with distributed rows, the
 * coupler meshes for source and target will be generated, in a migration step,
 * in which we will migrate from target pes according to row ids, to coupler target mesh,
 * and from source to coverage mesh mesh on coupler. During this migration, par comm graphs
 * will be established between source and coupler and target and coupler, which will assist
 * in field transfer from source to target, through coupler
 *
 */
 
#include "moab/Core.hpp"
#ifndef MOAB_HAVE_MPI
#error mbtempest tool requires MPI configuration
#endif
 
// MPI includes
#include "moab_mpi.h"
#include "moab/ParallelComm.hpp"
#include "MBParallelConventions.h"
 
#include "moab/iMOAB.h"
#include "TestUtil.hpp"
#include "moab/CpuTimer.hpp"
#include "moab/ProgOptions.hpp"
#include <iostream>
#include <sstream>
 
#include "imoab_coupler_utils.hpp"
 
#ifndef MOAB_HAVE_TEMPESTREMAP
#error The climate coupler test example requires MOAB configuration with TempestRemap
#endif
 
int main( int argc, char* argv[] )
{
 int ierr;
 int rankInGlobalComm, numProcesses;
 MPI_Group jgroup;
 std::string readopts( "PARALLEL=READ_PART;PARTITION=PARALLEL_PARTITION;PARALLEL_RESOLVE_SHARED_ENTS" );
 
 // Timer data
 moab::CpuTimer timer;
 double timer_ops;
 std::string opName;
 
 MPI_Init( &argc, &argv );
 MPI_Comm_rank( MPI_COMM_WORLD, &rankInGlobalComm );
 MPI_Comm_size( MPI_COMM_WORLD, &numProcesses );
 
 MPI_Comm_group( MPI_COMM_WORLD, &jgroup ); // all processes in jgroup
 
 std::string atmFilename = TestDir + "unittest/wholeATM_T.h5m";
 // on a regular case, 5 ATM, 6 CPLATM (ATMX), 17 OCN , 18 CPLOCN (OCNX) ;
 // intx atm/ocn is not in e3sm yet, give a number
 // 6 * 100+ 18 = 618 : atmocnid
 // 9 LND, 10 CPLLND
 // 6 * 100 + 10 = 610 atmlndid:
 // cmpatm is for atm on atm pes
 // cmpocn is for ocean, on ocean pe
 // cplatm is for atm on coupler pes
 // cplocn is for ocean on coupelr pes
 // atmocnid is for intx atm / ocn on coupler pes
 //
 int rankInAtmComm = -1;
 int cmpatm = 5,
 cplatm = 6; // component ids are unique over all pes, and established in advance;
 
 std::string ocnFilename = TestDir + "unittest/recMeshOcn.h5m";
 std::string mapFilename = TestDir + "unittest/atm_ocn_map.nc"; // this is a netcdf file!
 
 std::string baseline = TestDir + "unittest/baseline1.txt";
 int rankInOcnComm = -1;
 int cmpocn = 17, cplocn = 18,
 atmocnid = 618; // component ids are unique over all pes, and established in advance;
 
 int rankInCouComm = -1;
 
 int nghlay = 0; // number of ghost layers for loading the file
 std::vector< int > groupTasks;
 int startG1 = 0, startG2 = 0, endG1 = numProcesses - 1, endG2 = numProcesses - 1;
 
 int startG4 = startG1, endG4 = endG1; // these are for coupler layout
 int context_id = -1; // used now for freeing buffers
 
 // default: load atm on 2 proc, ocean on 2,
 // load map on 2 also, in parallel, distributed by rows (which is very bad actually for ocean mesh, because
 // probably all source cells will be involved in coverage mesh on both tasks
 
 ProgOptions opts;
 opts.addOpt< std::string >( "atmosphere,t", "atm mesh filename (source)", &atmFilename );
 opts.addOpt< std::string >( "ocean,m", "ocean mesh filename (target)", &ocnFilename );
 opts.addOpt< std::string >( "map_file,w", "map file from source to target", &mapFilename );
 
 opts.addOpt< int >( "startAtm,a", "start task for atmosphere layout", &startG1 );
 opts.addOpt< int >( "endAtm,b", "end task for atmosphere layout", &endG1 );
 
 opts.addOpt< int >( "startOcn,c", "start task for ocean layout", &startG2 );
 opts.addOpt< int >( "endOcn,d", "end task for ocean layout", &endG2 );
 
 opts.addOpt< int >( "startCoupler,g", "start task for coupler layout", &startG4 );
 opts.addOpt< int >( "endCoupler,j", "end task for coupler layout", &endG4 );
 
 int n = 1; // number of send/receive / project / send back cycles
 opts.addOpt< int >( "iterations,n", "number of iterations for coupler", &n );
 
 bool no_regression_test = false;
 opts.addOpt< void >( "no_regression,r", "do not do regression test against baseline 1", &no_regression_test );
 opts.parseCommandLine( argc, argv );
 
 char fileWriteOptions[] = "PARALLEL=WRITE_PART";
 
 if( !rankInGlobalComm )
 {
 std::cout << " atm file: " << atmFilename << "\n on tasks : " << startG1 << ":" << endG1
 << "\n ocn file: " << ocnFilename << "\n on tasks : " << startG2 << ":" << endG2
 << "\n map file:" << mapFilename << "\n on tasks : " << startG4 << ":" << endG4 << "\n";
 if( !no_regression_test )
 {
 std::cout << " check projection against baseline: " << baseline << "\n";
 }
 }
 
 // load files on 3 different communicators, groups
 // first groups has task 0, second group tasks 0 and 1
 // coupler will be on joint tasks, will be on a third group (0 and 1, again)
 // first groups has task 0, second group tasks 0 and 1
 // coupler will be on joint tasks, will be on a third group (0 and 1, again)
 MPI_Group atmPEGroup;
 MPI_Comm atmComm;
 ierr = create_group_and_comm( startG1, endG1, jgroup, &atmPEGroup, &atmComm );
 CHECKIERR( ierr, "Cannot create atm MPI group and communicator " )
 
 MPI_Group ocnPEGroup;
 MPI_Comm ocnComm;
 ierr = create_group_and_comm( startG2, endG2, jgroup, &ocnPEGroup, &ocnComm );
 CHECKIERR( ierr, "Cannot create ocn MPI group and communicator " )
 
 // we will always have a coupler
 MPI_Group couPEGroup;
 MPI_Comm couComm;
 ierr = create_group_and_comm( startG4, endG4, jgroup, &couPEGroup, &couComm );
 CHECKIERR( ierr, "Cannot create cpl MPI group and communicator " )
 
 // atm_coupler
 MPI_Group joinAtmCouGroup;
 MPI_Comm atmCouComm;
 ierr = create_joint_comm_group( atmPEGroup, couPEGroup, &joinAtmCouGroup, &atmCouComm );
 CHECKIERR( ierr, "Cannot create joint atm cou communicator" )
 
 // ocn_coupler
 MPI_Group joinOcnCouGroup;
 MPI_Comm ocnCouComm;
 ierr = create_joint_comm_group( ocnPEGroup, couPEGroup, &joinOcnCouGroup, &ocnCouComm );
 CHECKIERR( ierr, "Cannot create joint ocn cou communicator" )
 
 ierr = iMOAB_Initialize( argc, argv ); // not really needed anything from argc, argv, yet; maybe we should
 CHECKIERR( ierr, "Cannot initialize iMOAB" )
 
 int cmpAtmAppID = -1;
 iMOAB_AppID cmpAtmPID = &cmpAtmAppID; // atm
 int cplAtmAppID = -1; // -1 means it is not initialized
 iMOAB_AppID cplAtmPID = &cplAtmAppID; // atm on coupler PEs
 
 int cmpOcnAppID = -1;
 iMOAB_AppID cmpOcnPID = &cmpOcnAppID; // ocn
 int cplOcnAppID = -1, cplAtmOcnAppID = -1; // -1 means it is not initialized
 iMOAB_AppID cplOcnPID = &cplOcnAppID; // ocn on coupler PEs
 iMOAB_AppID cplAtmOcnPID = &cplAtmOcnAppID; // intx atm -ocn on coupler PEs
 
 if( couComm != MPI_COMM_NULL )
 {
 MPI_Comm_rank( couComm, &rankInCouComm );
 // Register all the applications on the coupler PEs
 ierr = iMOAB_RegisterApplication( "ATMX", &couComm, &cplatm,
 cplAtmPID ); // atm on coupler pes
 CHECKIERR( ierr, "Cannot register ATM over coupler PEs" )
 
 ierr = iMOAB_RegisterApplication( "OCNX", &couComm, &cplocn,
 cplOcnPID ); // ocn on coupler pes
 CHECKIERR( ierr, "Cannot register OCN over coupler PEs" )
 }
 
 if( atmComm != MPI_COMM_NULL )
 {
 MPI_Comm_rank( atmComm, &rankInAtmComm );
 ierr = iMOAB_RegisterApplication( "ATM1", &atmComm, &cmpatm, cmpAtmPID );
 CHECKIERR( ierr, "Cannot register ATM App" )
 ierr = iMOAB_LoadMesh( cmpAtmPID, atmFilename.c_str(), readopts.c_str(), &nghlay );
 CHECKIERR( ierr, "Cannot load atm mesh" )
 }
 
 MPI_Barrier( MPI_COMM_WORLD );
 if( ocnComm != MPI_COMM_NULL )
 {
 MPI_Comm_rank( ocnComm, &rankInOcnComm );
 ierr = iMOAB_RegisterApplication( "OCN1", &ocnComm, &cmpocn, cmpOcnPID );
 CHECKIERR( ierr, "Cannot register OCN App" )
 ierr = iMOAB_LoadMesh( cmpOcnPID, ocnFilename.c_str(), readopts.c_str(), &nghlay );
 CHECKIERR( ierr, "Cannot load ocn mesh" )
 }
 
 MPI_Barrier( MPI_COMM_WORLD );
 
 if( couComm != MPI_COMM_NULL )
 {
 // now load map between OCNx and ATMx on coupler PEs
 ierr = iMOAB_RegisterApplication( "ATMOCN", &couComm, &atmocnid, cplAtmOcnPID );
 CHECKIERR( ierr, "Cannot register ocn_atm map instance over coupler pes " )
 }
 
 int disc_orders[3] = { 4, 1, 1 };
 
 const std::string intx_from_file_identifier = "map-from-file";
 
 if( couComm != MPI_COMM_NULL )
 {
 int dummyCpl = -1;
 int dummy_rowcol = -1;
 int dummyType = 0;
 ierr = iMOAB_LoadMappingWeightsFromFile( cplAtmOcnPID, &dummyCpl, &dummy_rowcol, &dummyType,
 intx_from_file_identifier.c_str(), mapFilename.c_str() );
 CHECKIERR( ierr, "failed to load map file from disk" );
 }
 
 if( atmCouComm != MPI_COMM_NULL )
 {
 int type = 1; // quads in source set
 int direction = 1; // from source to coupler; will create a mesh on cplAtmPID
 // because it is like "coverage", context will be cplocn
 ierr = iMOAB_MigrateMapMesh( cmpAtmPID, cplAtmOcnPID, cplAtmPID, &atmCouComm, &atmPEGroup, &couPEGroup, &type,
 &cmpatm, &cplocn, &direction );
 CHECKIERR( ierr, "failed to migrate mesh for atm on coupler" );
#ifdef VERBOSE
 if( *cplAtmPID >= 0 )
 {
 char prefix[] = "atmcov";
 ierr = iMOAB_WriteLocalMesh( cplAtmPID, prefix );
 CHECKIERR( ierr, "failed to write local mesh" );
 }
#endif
 }
 MPI_Barrier( MPI_COMM_WORLD );
 
 if( ocnCouComm != MPI_COMM_NULL )
 {
 int type = 3; // cells with GLOBAL_ID in ocean / target set
 int direction = 2; // from coupler to target; will create a mesh on cplOcnPID
 // it will be like initial migrate cmpocn <-> cplocn
 ierr = iMOAB_MigrateMapMesh( cmpOcnPID, cplAtmOcnPID, cplOcnPID, &ocnCouComm, &ocnPEGroup, &couPEGroup, &type,
 &cmpocn, &cplocn, &direction );
 CHECKIERR( ierr, "failed to migrate mesh for ocn on coupler" );
#ifdef VERBOSE
 if( *cplOcnPID >= 0 )
 {
 char prefix[] = "ocntgt";
 ierr = iMOAB_WriteLocalMesh( cplOcnPID, prefix );
 CHECKIERR( ierr, "failed to write local ocean mesh" );
 char outputFileRec[] = "CoupOcn.h5m";
 ierr = iMOAB_WriteMesh( cplOcnPID, outputFileRec, fileWriteOptions );
 CHECKIERR( ierr, "failed to write ocean global mesh file" );
 }
#endif
 }
 MPI_Barrier( MPI_COMM_WORLD );
 
 int tagIndex[2];
 int tagTypes[2] = { DENSE_DOUBLE, DENSE_DOUBLE };
 int atmCompNDoFs = disc_orders[0] * disc_orders[0], ocnCompNDoFs = 1 /*FV*/;
 
 const char* bottomFields = "a2oTbot:a2oUbot:a2oVbot";
 const char* bottomProjectedFields = "a2oTbot_proj:a2oUbot_proj:a2oVbot_proj";
 
 if( couComm != MPI_COMM_NULL )
 {
 ierr = iMOAB_DefineTagStorage( cplAtmPID, bottomFields, &tagTypes[0], &atmCompNDoFs, &tagIndex[0] );
 CHECKIERR( ierr, "failed to define the field tags a2oTbot:a2oUbot:a2oVbot" );
 
 ierr = iMOAB_DefineTagStorage( cplOcnPID, bottomProjectedFields, &tagTypes[1], &ocnCompNDoFs, &tagIndex[1] );
 CHECKIERR( ierr, "failed to define the field tags a2oTbot_proj:a2oUbot_proj:a2oVbot_proj " );
 }
 
 // need to make sure that the coverage mesh (created during intx method) received the tag that
 // need to be projected to target so far, the coverage mesh has only the ids and global dofs;
 // need to change the migrate method to accommodate any GLL tag
 // now send a tag from original atmosphere (cmpAtmPID) towards migrated coverage mesh
 // (cplAtmPID), using the new coverage graph communicator
 
 // make the tag 0, to check we are actually sending needed data
 {
 if( cplAtmAppID >= 0 )
 {
 int nverts[3], nelem[3], nblocks[3], nsbc[3], ndbc[3];
 /*
 * Each process in the communicator will have access to a local mesh instance, which
 * will contain the original cells in the local partition and ghost entities. Number of
 * vertices, primary cells, visible blocks, number of sidesets and nodesets boundary
 * conditions will be returned in numProcesses 3 arrays, for local, ghost and total
 * numbers.
 */
 ierr = iMOAB_GetMeshInfo( cplAtmPID, nverts, nelem, nblocks, nsbc, ndbc );
 CHECKIERR( ierr, "failed to get num primary elems" );
 int numAllElem = nelem[2];
 std::vector< double > vals;
 int storLeng = atmCompNDoFs * numAllElem * 3; // 3 tags
 int eetype = 1;
 
 vals.resize( storLeng );
 for( int k = 0; k < storLeng; k++ )
 vals[k] = 0.;
 
 ierr = iMOAB_SetDoubleTagStorage( cplAtmPID, bottomFields, &storLeng, &eetype, &vals[0] );
 CHECKIERR( ierr, "cannot make tag nul" )
 }
 }
 
 const char* concat_fieldname = "a2oTbot:a2oUbot:a2oVbot";
 const char* concat_fieldnameT = "a2oTbot_proj:a2oUbot_proj:a2oVbot_proj";
 
 // start a virtual loop for number of iterations
 for( int iters = 0; iters < n; iters++ )
 {
 
 PUSH_TIMER( "Send/receive data from atm component to coupler in ocn context" )
 if( atmComm != MPI_COMM_NULL )
 {
 // as always, use nonblocking sends
 // this is for projection to ocean:
 ierr = iMOAB_SendElementTag( cmpAtmPID, "a2oTbot:a2oUbot:a2oVbot", &atmCouComm, &cplocn );
 CHECKIERR( ierr, "cannot send tag values" )
#ifdef GRAPH_INFO
 int is_sender = 1;
 int context = cplocn;
 iMOAB_DumpCommGraph( cmpAtmPID, &context, &is_sender, "AtmCovOcnS" );
#endif
 }
 if( couComm != MPI_COMM_NULL )
 {
 // receive on atm on coupler pes, that was redistributed according to coverage
 ierr = iMOAB_ReceiveElementTag( cplAtmPID, "a2oTbot:a2oUbot:a2oVbot", &atmCouComm, &cmpatm );
 CHECKIERR( ierr, "cannot receive tag values" )
#ifdef GRAPH_INFO
 int is_sender = 0;
 int context = atmocnid; // the same context
 iMOAB_DumpCommGraph( cmpAtmPID, &context, &is_sender, "AtmCovOcnR" );
#endif
 }
 
 // we can now free the sender buffers
 if( atmComm != MPI_COMM_NULL )
 {
 ierr = iMOAB_FreeSenderBuffers( cmpAtmPID, &cplocn ); // context is for ocean
 CHECKIERR( ierr, "cannot free buffers used to resend atm tag towards the coverage mesh" )
 }
 POP_TIMER( MPI_COMM_WORLD, rankInGlobalComm )
#ifdef VERBOSE
 if( *cplAtmPID >= 0 && n == 1 )
 {
 char prefix[] = "atmcov_withdata";
 ierr = iMOAB_WriteLocalMesh( cplAtmPID, prefix );
 CHECKIERR( ierr, "failed to write local atm cov mesh with data" );
 }
 
 if( couComm != MPI_COMM_NULL && 1 == n )
 {
 // write only for n==1 case
 char outputFileRecvd[] = "recvAtmCoupOcn.h5m";
 ierr = iMOAB_WriteMesh( cplAtmPID, outputFileRecvd, fileWriteOptions );
 CHECKIERR( ierr, "could not write recvAtmCoupOcn.h5m to disk" )
 }
#endif
 
 if( couComm != MPI_COMM_NULL )
 {
 /* We have the remapping weights now. Let us apply the weights onto the tag we defined
 on the source mesh and get the projection on the target mesh */
 PUSH_TIMER( "Apply Scalar projection weights" )
 ierr = iMOAB_ApplyScalarProjectionWeights( cplAtmOcnPID, intx_from_file_identifier.c_str(),
 concat_fieldname, concat_fieldnameT );
 CHECKIERR( ierr, "failed to compute projection weight application" );
 POP_TIMER( couComm, rankInCouComm )
 if( 1 == n ) // write only for n==1 case
 {
 char outputFileTgt[] = "fOcnOnCpl8.h5m";
 ierr = iMOAB_WriteMesh( cplOcnPID, outputFileTgt, fileWriteOptions );
 CHECKIERR( ierr, "could not write fOcnOnCpl8.h5m to disk" )
 }
 }
 
 // send the projected tag back to ocean pes, with send/receive tag
 if( ocnComm != MPI_COMM_NULL )
 {
 int tagIndexIn2;
 ierr =
 iMOAB_DefineTagStorage( cmpOcnPID, bottomProjectedFields, &tagTypes[1], &ocnCompNDoFs, &tagIndexIn2 );
 CHECKIERR( ierr, "failed to define the field tag for receiving back the tags "
 "a2oTbot_proj:a2oUbot_proj:a2oVbot_proj on ocn pes" );
 }
 // send the tag to ocean pes, from ocean mesh on coupler pes
 // from couComm, using common joint comm ocn_coupler
 // as always, use nonblocking sends
 // original graph (context is -1_
 if( couComm != MPI_COMM_NULL )
 {
 // need to use ocean comp id for context
 context_id = cmpocn; // id for ocean on comp
 ierr =
 iMOAB_SendElementTag( cplOcnPID, "a2oTbot_proj:a2oUbot_proj:a2oVbot_proj", &ocnCouComm, &context_id );
 CHECKIERR( ierr, "cannot send tag values back to ocean pes" )
 }
 
 // receive on component 2, ocean
 if( ocnComm != MPI_COMM_NULL )
 {
 context_id = cplocn; // id for ocean on coupler
 ierr = iMOAB_ReceiveElementTag( cmpOcnPID, "a2oTbot_proj:a2oUbot_proj:a2oVbot_proj", &ocnCouComm,
 &context_id );
 CHECKIERR( ierr, "cannot receive tag values from ocean mesh on coupler pes" )
 }
 
 if( couComm != MPI_COMM_NULL )
 {
 context_id = cmpocn;
 ierr = iMOAB_FreeSenderBuffers( cplOcnPID, &context_id );
 }
 MPI_Barrier( MPI_COMM_WORLD );
 
 if( ocnComm != MPI_COMM_NULL && 1 == n ) // write only for n==1 case
 {
#ifdef VERBOSE
 char outputFileOcn[] = "OcnWithProj.h5m";
 ierr = iMOAB_WriteMesh( cmpOcnPID, outputFileOcn, fileWriteOptions );
 CHECKIERR( ierr, "could not write OcnWithProj.h5m to disk" )
#endif
 // test results only for n == 1, for bottomTempProjectedField = "a2oTbot_proj"
 if( !no_regression_test )
 {
 // the same as remap test
 // get temp field on ocean, from conservative, the global ids, and dump to the baseline file
 // first get GlobalIds from ocn, and fields:
 int nverts[3], nelem[3];
 ierr = iMOAB_GetMeshInfo( cmpOcnPID, nverts, nelem, 0, 0, 0 );
 CHECKIERR( ierr, "failed to get ocn mesh info" );
 std::vector< int > gidElems;
 gidElems.resize( nelem[2] );
 std::vector< double > tempElems;
 tempElems.resize( nelem[2] );
 // get global id storage
 const std::string GidStr = "GLOBAL_ID"; // hard coded too
 int tag_type = DENSE_INTEGER, ncomp = 1, tagInd = 0;
 ierr = iMOAB_DefineTagStorage( cmpOcnPID, GidStr.c_str(), &tag_type, &ncomp, &tagInd );
 CHECKIERR( ierr, "failed to define global id tag" );
 
 int ent_type = 1;
 ierr = iMOAB_GetIntTagStorage( cmpOcnPID, GidStr.c_str(), &nelem[2], &ent_type, &gidElems[0] );
 CHECKIERR( ierr, "failed to get global ids" );
 ierr = iMOAB_GetDoubleTagStorage( cmpOcnPID, "a2oTbot_proj", &nelem[2], &ent_type, &tempElems[0] );
 CHECKIERR( ierr, "failed to get temperature field" );
 int err_code = 1;
 check_baseline_file( baseline, gidElems, tempElems, 1.e-9, err_code );
 if( 0 == err_code )
 std::cout << " passed baseline test atm2ocn on ocean task " << rankInOcnComm << "\n";
 }
 }
 
 } // end loop iterations n
 
 if( couComm != MPI_COMM_NULL )
 {
 ierr = iMOAB_DeregisterApplication( cplAtmOcnPID );
 CHECKIERR( ierr, "cannot deregister app intx AO" )
 }
 if( ocnComm != MPI_COMM_NULL )
 {
 ierr = iMOAB_DeregisterApplication( cmpOcnPID );
 CHECKIERR( ierr, "cannot deregister app OCN1" )
 }
 
 if( atmComm != MPI_COMM_NULL )
 {
 ierr = iMOAB_DeregisterApplication( cmpAtmPID );
 CHECKIERR( ierr, "cannot deregister app ATM1" )
 }
 
 if( couComm != MPI_COMM_NULL )
 {
 ierr = iMOAB_DeregisterApplication( cplOcnPID );
 CHECKIERR( ierr, "cannot deregister app OCNX" )
 }
 
 if( couComm != MPI_COMM_NULL )
 {
 ierr = iMOAB_DeregisterApplication( cplAtmPID );
 CHECKIERR( ierr, "cannot deregister app ATMX" )
 }
 
 //#endif
 ierr = iMOAB_Finalize();
 CHECKIERR( ierr, "did not finalize iMOAB" )
 
 // free atm coupler group and comm
 if( MPI_COMM_NULL != atmCouComm ) MPI_Comm_free( &atmCouComm );
 MPI_Group_free( &joinAtmCouGroup );
 if( MPI_COMM_NULL != atmComm ) MPI_Comm_free( &atmComm );
 
 if( MPI_COMM_NULL != ocnComm ) MPI_Comm_free( &ocnComm );
 // free ocn - coupler group and comm
 if( MPI_COMM_NULL != ocnCouComm ) MPI_Comm_free( &ocnCouComm );
 MPI_Group_free( &joinOcnCouGroup );
 
 if( MPI_COMM_NULL != couComm ) MPI_Comm_free( &couComm );
 
 MPI_Group_free( &atmPEGroup );
 
 MPI_Group_free( &ocnPEGroup );
 
 MPI_Group_free( &couPEGroup );
 MPI_Group_free( &jgroup );
 
 MPI_Finalize();
 
 return 0;
}