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211 | /* Parallel Merge Mesh Test
Nathan Bertram
5/31/11
*/
#include "moab/ParallelMergeMesh.hpp"
#include "moab/Core.hpp"
#include "moab/Range.hpp"
#include "moab_mpi.h"
#include <iostream>
#include <string>
#include <cstdlib>
#include "moab/ParallelMergeMesh.hpp"
#include "moab/ParallelComm.hpp"
#include "MBParallelConventions.h"
#include <fstream>
#include <sstream>
#include "moab/Skinner.hpp"
// Should we print out info on the merged mesh?
#define PrintInfo false
/*
Parmerge
Takes multiple mesh files and merges them into a single output file.
This is a driver for ParallelMergeMesh
Does not currently work if #procs > #meshfiles
<inputfile> is text file containing each mesh file on a line
i.e.
/my/path/file1
/my/path/file2
...
/my/path/fileN
<outputfile> file is a single file where the entire mesh is written to
It must be of type ".h5m"
<tolerance> is the merging tolerance
Typical usage of:
mpirun -n <#procs> parmerge <inputfile> <outputfile> <tolerance>
*/
// Function to print out info for testing purposes
void print_output( moab::ParallelComm* pc, moab::Core* mb, int numprocs, int myID, bool perform );
int main( int argc, char* argv[] )
{
// Check argument count
if( argc != 4 )
{
std::cerr << "Usage: " << argv[0] << " <inputfile> <outputfile> <tolerance>" << std::endl;
return 1;
}
// Check the output file extension
std::string outfile( argv[2] );
if( outfile.compare( outfile.size() - 4, 4, ".h5m" ) != 0 )
{
std::cerr << "Invalid Parallel Output File" << std::endl;
return 1;
}
// Read in tolerance
double epsilon;
if( !( std::istringstream( argv[3] ) >> epsilon ) )
{
std::cerr << "Unable to parse tolerance" << std::endl;
return 1;
}
// Initialize MPI
int numprocs, myID;
MPI_Init( &argc, &argv );
MPI_Comm_size( MPI_COMM_WORLD, &numprocs );
MPI_Comm_rank( MPI_COMM_WORLD, &myID );
// Read in files from input files
// Round robin distribution of reading meshes
moab::Core* mb = new moab::Core();
moab::ErrorCode rval;
std::ifstream file( argv[1] );
if( file.is_open() )
{
std::string line;
int count = 0;
// Read each line
while( file.good() )
{
getline( file, line );
if( myID == count && line != "" )
{
// Read in the file
rval = mb->load_mesh( line.c_str() );
if( rval != moab::MB_SUCCESS )
{
std::cerr << "Error Opening Mesh File " << line << std::endl;
MPI_Abort( MPI_COMM_WORLD, 1 );
file.close();
return 1;
}
}
count = ( count + 1 ) % numprocs;
}
file.close();
}
else
{
std::cerr << "Error Opening Input File " << argv[1] << std::endl;
MPI_Abort( MPI_COMM_WORLD, 1 );
return 1;
}
// Get a pcomm object
moab::ParallelComm* pc = new moab::ParallelComm( mb, MPI_COMM_WORLD );
// Call the resolve parallel function
moab::ParallelMergeMesh pm( pc, epsilon );
rval = pm.merge();
if( rval != moab::MB_SUCCESS )
{
std::cerr << "Merge Failed" << std::endl;
MPI_Abort( MPI_COMM_WORLD, 1 );
return 1;
}
print_output( pc, mb, myID, numprocs, PrintInfo );
// Write out the file
rval = mb->write_file( outfile.c_str(), 0, "PARALLEL=WRITE_PART" );
if( rval != moab::MB_SUCCESS )
{
std::cerr << "Writing output file failed. Code:";
// Temporary File error info.
std::cerr << mb->get_error_string( rval ) << std::endl;
std::string foo = "";
mb->get_last_error( foo );
std::cerr << "File Error: " << foo << std::endl;
return 1;
}
// The barrier may be necessary to stop items from being deleted when needed
// But probably not necessary
MPI_Barrier( MPI_COMM_WORLD );
delete pc;
delete mb;
MPI_Finalize();
return 0;
}
// This function doesn't normally get called, but is here for debugging
// and verifying that merge is working.
void print_output( moab::ParallelComm* pc, moab::Core* mb, int myID, int /* numprocs */, bool perform )
{
moab::Range ents, skin;
int o_ct = 0, no_ct = 0, tmp = 0, o_tot = 0, no_tot = 0;<--- The scope of the variable 'tmp' can be reduced. [+]The scope of the variable 'tmp' can be reduced. Warning: Be careful when fixing this message, especially when there are inner loops. Here is an example where cppcheck will write that the scope for 'i' can be reduced:<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
void f(int x)<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
{<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
int i = 0;<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
if (x) {<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
// it's safe to move 'int i = 0;' here<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
for (int n = 0; n < 10; ++n) {<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
// it is possible but not safe to move 'int i = 0;' here<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
do_something(&i);<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
}<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
}<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
}<--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
When you see this message it is always safe to reduce the variable scope 1 level. <--- Variable 'no_ct' is assigned a value that is never used.<--- Variable 'no_tot' is assigned a value that is never used.
if( perform )
{
if( myID == 0 ) std::cout << "------------------------------------------" << std::endl;
// Check the count of total vertices
mb->get_entities_by_dimension( 0, 0, ents );
for( moab::Range::iterator rit = ents.begin(); rit != ents.end(); ++rit )
{
pc->get_owner( *rit, tmp );
if( tmp == myID )
{
o_ct++;
}
}
MPI_Reduce( &o_ct, &o_tot, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD );
if( myID == 0 )
{
std::cout << "There are " << o_tot << " vertices." << std::endl;
std::cout << "------------------------------------------" << std::endl;
}
// Check the count of owned and not owned skin faces.
// owned-not owned == total skin faces
moab::Skinner skinner( mb );
o_ct = 0;
no_ct = 0;
o_tot = 0;
no_tot = 0;
skin.clear();
ents.clear();
mb->get_entities_by_dimension( 0, 3, ents );
skinner.find_skin( 0, ents, 2, skin );
for( moab::Range::iterator s_rit = skin.begin(); s_rit != skin.end(); ++s_rit )
{
pc->get_owner( *s_rit, tmp );
if( tmp == myID )
{
o_ct++;
}
else
{
no_ct++;
}
}
MPI_Reduce( &o_ct, &o_tot, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD );
MPI_Reduce( &no_ct, &no_tot, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD );
if( myID == 0 )
{
std::cout << "There are " << o_tot << " owned skin faces." << std::endl;
std::cout << "There are " << no_tot << " not owned skin faces." << std::endl;
std::cout << "The difference (Global Skin Faces) is " << ( o_tot - no_tot ) << "." << std::endl;
std::cout << "------------------------------------------" << std::endl;
}
}
}
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