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#include <cctk.h>
#include <algorithm>
#include <cassert>
#include <cstring>
#include <string>
#include <vector>
#ifdef CCTK_MPI
# include <mpi.h>
#else
# include "nompi.h"
#endif
#include "dh.hh"
#include "mpi_string.hh"
#include "region.hh"
namespace CarpetLib
{
using namespace std;
vector <string>
gather_string (MPI_Comm const comm,
int const root,
string const & data)
{
// Get my rank
int rank;
MPI_Comm_rank (comm, & rank);
if (rank == root) {
// Get the total number of processes
int num_procs;
MPI_Comm_size (comm, & num_procs);
// Gather the lengths of the data strings
int const length = data.length();
vector <int> lengths (num_procs);
MPI_Gather (const_cast <int *> (& length), 1, MPI_INT,
& lengths.front(), 1, MPI_INT,
root, comm);
// Allocate space for all data strings
vector <int> offsets (num_procs + 1);
offsets.AT(0) = 0;
for (int n = 0; n < num_procs; ++ n)
{
offsets.AT(n + 1) = offsets.AT(n) + lengths.AT(n);
}
int const total_length = offsets.AT(num_procs);
vector <char> alldata_buffer (total_length);
// Gather all data strings
MPI_Gatherv (const_cast <char *> (data.c_str()), length, MPI_CHAR,
& alldata_buffer.front(),
const_cast <int *> (& lengths.front()),
const_cast <int *> (& offsets.front()),
MPI_CHAR,
root, comm);
// Convert data buffer with C strings to C++ strings
vector <string> alldata (num_procs);
for (int n = 0; n < num_procs; ++ n)
{
alldata.AT(n) =
string (& alldata_buffer.AT (offsets.AT(n)), lengths.AT(n));
}
return alldata;
} else {
// Gather the lengths of the data strings
int const length = data.length();
MPI_Gather (const_cast <int *> (& length), 1, MPI_INT,
NULL, 1, MPI_INT,
root, comm);
// Gather all data strings
MPI_Gatherv (const_cast <char *> (data.c_str()), length, MPI_CHAR,
NULL, NULL, NULL, MPI_CHAR,
root, comm);
// Convert data buffer with C strings to C++ strings
vector <string> alldata;
return alldata;
}
}
vector <string>
allgather_string (MPI_Comm const comm,
string const & data)
{
// Get the total number of processes
int num_procs;
MPI_Comm_size (comm, & num_procs);
// Gather the lengths of the data strings
int const length = data.length();
vector <int> lengths (num_procs);
MPI_Allgather (const_cast <int *> (& length), 1, MPI_INT,
& lengths.front(), 1, MPI_INT,
comm);
// Allocate space for all data strings
vector <int> offsets (num_procs + 1);
offsets.AT(0) = 0;
for (int n = 0; n < num_procs; ++ n)
{
offsets.AT(n + 1) = offsets.AT(n) + lengths.AT(n);
}
int const total_length = offsets.AT(num_procs);
vector <char> alldata_buffer (total_length);
// Gather all data strings
MPI_Allgatherv (const_cast <char *> (data.c_str()), length, MPI_CHAR,
& alldata_buffer.front(),
const_cast <int *> (& lengths.front()),
const_cast <int *> (& offsets.front()),
MPI_CHAR,
comm);
// Convert data buffer with C strings to C++ strings
vector <string> alldata (num_procs);
for (int n = 0; n < num_procs; ++ n)
{
alldata.AT(n) =
string (& alldata_buffer.AT (offsets.AT(n)), lengths.AT(n));
}
return alldata;
}
vector <string>
alltoallv_string (MPI_Comm const comm,
vector<string> const & data)
{
// Get the total number of processes
int num_procs;
MPI_Comm_size (comm, & num_procs);
// Exchange the lengths of the data strings
vector <int> lengths_in (num_procs);
for (int n = 0; n < num_procs; ++ n)
{
lengths_in.AT(n) = data.AT(n).length();
}
vector <int> lengths (num_procs);
MPI_Alltoall (& lengths_in.front(), 1, MPI_INT,
& lengths.front(), 1, MPI_INT,
comm);
// Allocate space for all data strings
vector <int> offsets_in (num_procs + 1);
offsets_in.AT(0) = 0;
for (int n = 0; n < num_procs; ++ n)
{
offsets_in.AT(n + 1) = offsets_in.AT(n) + lengths_in.AT(n);
}
int const total_length_in = offsets_in.AT(num_procs);
vector <char> alldata_buffer_in (total_length_in);
vector <int> offsets (num_procs + 1);
offsets.AT(0) = 0;
for (int n = 0; n < num_procs; ++ n)
{
offsets.AT(n + 1) = offsets.AT(n) + lengths.AT(n);
}
int const total_length = offsets.AT(num_procs);
vector <char> alldata_buffer (total_length);
// Convert C++ strings to data buffer with C strings
for (int n = 0; n < num_procs; ++ n)
{
memcpy (& alldata_buffer_in.AT (offsets_in.AT(n)),
data.AT(n).c_str(),
lengths_in.AT(n));
}
// Exchange all data strings
MPI_Alltoallv (& alldata_buffer_in.front(),
& lengths_in.front(), & offsets_in.front(), MPI_CHAR,
& alldata_buffer.front(),
& lengths.front(), & offsets.front(), MPI_CHAR,
comm);
// Convert data buffer with C strings to C++ strings
vector <string> alldata (num_procs);
for (int n = 0; n < num_procs; ++ n)
{
alldata.AT(n) =
string (& alldata_buffer.AT (offsets.AT(n)), lengths.AT(n));
}
return alldata;
}
string
broadcast_string (MPI_Comm const comm,
int const root,
string const & data)
{
// Get my rank
int rank;
MPI_Comm_rank (comm, & rank);
if (rank == root) {
// Broadcast the length of the data string
int const length = data.length();
MPI_Bcast (const_cast <int *> (& length), 1, MPI_INT, root, comm);
// Broadcast data string
char const * const buf = data.c_str();
MPI_Bcast (const_cast <char *> (buf), length, MPI_CHAR, root, comm);
// Return original string
return data;
} else {
// Broadcast the length of the data string
int length;
MPI_Bcast (& length, 1, MPI_INT, root, comm);
// Allocate space for data string
vector <char> data_buffer (length);
// Broadcast data string
char * const buf = & data_buffer.front();
MPI_Bcast (buf, length, MPI_CHAR, root, comm);
// Convert data buffer with C strings to C++ strings
string const result = string (& data_buffer.front(), length);
return result;
}
}
//////////////////////////////////////////////////////////////////////////////
template
vector <vector <dh::light_dboxes> >
allgatherv (MPI_Comm comm,
vector <dh::light_dboxes> const & data);
template
vector <ivect>
allgatherv1 (MPI_Comm comm,
vector <ivect> const & data);
} // namespace CarpetLib
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