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initialize_file.cpp
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initialize_file.cpp
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#include "initialize_file.h"
#include <string>
#include <unistd.h>
#include <iostream>
#include <vector>
#include <mpi.h>
#include <cstring>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
// --------------------------------------------------------------------------
template <typename T>
int readn(int fh, T *buf, size_t n)
{
ssize_t ierr = 0;
ssize_t nb = n*sizeof(T);
if ((ierr = read(fh, buf, nb)) != nb)
{
std::cerr << "Failed to read " << n << " elements of size "
<< sizeof(T) << std::endl << strerror(errno) << std::endl;
return -1;
}
return 0;
}
// --------------------------------------------------------------------------
int initialize_file(MPI_Comm comm, const std::string &idir,
std::vector<patch> &patches, patch_data &lpd,
double &h, double &eps, double &nfr)
{
int rank = 0;
int n_ranks = 1;
MPI_Comm_rank(comm, &rank);
MPI_Comm_size(comm, &n_ranks);
// read the set of patches
long n_patches = 0;
std::vector<double> tpatches;
if (rank == 0)
{
// rank 0 reads and sends to all others
std::string fn = idir + "/patches.npp";
int h = open(fn.c_str(), O_RDONLY);
if (h < 0)
{
std::cerr << "Failed to open \"" << fn << "\"" << std::endl
<< strerror(errno) << std::endl;
return -1;
}
if (readn(h, &n_patches, 1 ))
{
std::cerr << "Failed to read \"" << fn << "\"" << std::endl;
close(h);
return -1;
}
long n_elem = 6*n_patches;
tpatches.resize(n_elem);
if (readn(h, tpatches.data(), n_elem))
{
std::cerr << "Failed to read \"" << fn << "\"" << std::endl;
close(h);
return -1;
}
close(h);
MPI_Bcast(&n_patches, 1, MPI_LONG, 0, comm);
MPI_Bcast(tpatches.data(), n_elem, MPI_DOUBLE, 0, comm);
}
else
{
// receive from rank 0
MPI_Bcast(&n_patches, 1, MPI_LONG, 0, comm);
long n_elem = 6*n_patches;
tpatches.resize(n_elem);
MPI_Bcast(tpatches.data(), n_elem, MPI_DOUBLE, 0, comm);
}
// convert to patch structures
patches.resize(n_ranks);
for (int i = 0; i < n_ranks; ++i)
{
const double *pp = &tpatches[6*i];
patches[i] = patch(i, pp[0], pp[1], pp[2], pp[3], pp[4], pp[5]);
}
// check that number of ranks and patches match
if (n_patches != n_ranks)
{
std::cerr << "Wrong number of patches " << n_patches
<< " for " << n_ranks << " ranks" << std::endl;
return -1;
}
// read the local patch data
{
std::string fn = idir + "/patch_data_" + std::to_string(rank) + ".npp";
int fh = open(fn.c_str(), O_RDONLY);
if (fh < 0)
{
std::cerr << "Failed to open \"" << fn << "\"" << std::endl
<< strerror(errno) << std::endl;
return -1;
}
long nbod = 0;
if (readn(fh, &nbod, 1))
{
std::cerr << "Failed to read \"" << fn << "\"" << std::endl;
close(fh);
return -1;
}
if (nbod)
{
hamr::buffer<double> tm(cpu_alloc(), nbod);
hamr::buffer<double> tx(cpu_alloc(), nbod);
hamr::buffer<double> ty(cpu_alloc(), nbod);
hamr::buffer<double> tz(cpu_alloc(), nbod);
hamr::buffer<double> tu(cpu_alloc(), nbod);
hamr::buffer<double> tv(cpu_alloc(), nbod);
hamr::buffer<double> tw(cpu_alloc(), nbod);
if (readn(fh, tm.data(), nbod) ||
readn(fh, tx.data(), nbod) || readn(fh, ty.data(), nbod) || readn(fh, tz.data(), nbod) ||
readn(fh, tu.data(), nbod) || readn(fh, tv.data(), nbod) || readn(fh, tw.data(), nbod))
{
std::cerr << "Failed to read \"" << fn << "\"" << std::endl;
close(fh);
return -1;
}
lpd.m_m = std::move(tm);
lpd.m_x = std::move(tx);
lpd.m_y = std::move(ty);
lpd.m_z = std::move(tz);
lpd.m_u = std::move(tu);
lpd.m_v = std::move(tv);
lpd.m_w = std::move(tw);
}
}
// read parameters
if (rank == 0)
{
std::string fn = idir + "/params.npp";
FILE *fh = nullptr;
if ((fh = fopen(fn.c_str(),"r")) == nullptr)
{
std::cerr << "Failed to open \"" << fn << "\"" << std::endl
<< strerror(errno) << std::endl;
}
if (fscanf(fh, "h = %lf, eps = %lf, nfr = %lf", &h, &eps, &nfr) != 3)
{
fclose(fh);
std::cerr << "Failed to read h, eps, nfr from file " << fn << std::endl;
return -1;
}
fclose(fh);
}
MPI_Bcast(&h, 1, MPI_DOUBLE, 0, comm);
MPI_Bcast(&eps, 1, MPI_DOUBLE, 0, comm);
MPI_Bcast(&nfr, 1, MPI_DOUBLE, 0, comm);
return 0;
}
// --------------------------------------------------------------------------
int initialize_file(MPI_Comm comm, const char *idir,
std::vector<patch> &patches, patch_data &lpd,
double &h, double &eps, double &nfr,
const char *&odir, long &nits, long &io_int)
{
int rank = 0;
MPI_Comm_rank(comm, &rank);
// initialize
if (initialize_file(comm, idir, patches, lpd, h, eps, nfr))
return -1;
long lnb = lpd.size();
long tnb = 0;
MPI_Reduce(&lnb, &tnb, 1, MPI_LONG, MPI_SUM, 0, comm);
if (rank == 0)
{
std::cerr << "initialized " << tnb << " bodies on " << patches.size()
<< " patches. h=" << h << " eps=" << eps << " nfr=" << nfr << std::endl;
}
return 0;
}