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/*
* ADIOS is freely available under the terms of the BSD license described
* in the COPYING file in the top level directory of this source distribution.
*
* Copyright (c) 2008 - 2009. UT-BATTELLE, LLC. All rights reserved.
*/
/* ADIOS C Example: write variables along with an rectilinear mesh.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "mpi.h"
#include "public/adios.h"
#include "public/adios_types.h"
//will work with 12 cores, which are arranged by npx=4, npy=3 (4x3)
char npx_str[256]; // # of procs in x dim (string value)
char npy_str[256]; // # of procs in y dim (string value)
int npx; // # of procs in x direction
int npy; // # of procs in y direction
int nproc; // # of total procs
void printUsage(char *prgname)
{
printf("Usage: mpirun -np <N> %s <nx> <ny>\n"
" <nx> <ny> 2D decomposition values in each dimension of an 2D array\n"
" The product of these number must be equal the number of processes\n"
" e.g. for N=12 you may use 4 3\n"
,prgname);
}
int processArgs(int argc, char ** argv)
{
if (argc < 3) {
printUsage (argv[0]);
return 1;
}
strncpy(npx_str, argv[1], sizeof(npx_str));
strncpy(npy_str, argv[2], sizeof(npy_str));
npx = atoi(npx_str);
npy = atoi(npy_str);
if (npx*npy != nproc) {
printf ("ERROR: Product of decomposition numbers in X and Y dimension %d != number of processes %d\n", npx*npy, nproc);
printUsage(argv[0]);
return 1;
}
return 0;
}
int main (int argc, char ** argv)
{
MPI_Comm comm = MPI_COMM_WORLD;
int rank;
int ndx, ndy; // size of array per processor
double * data;
double *X; //X coordinate
double *Y; //Y coordinate
// Offsets and sizes
int offs_x, offs_y; //offset in x and y direction
int nx_local, ny_local; //local address
int nx_global, ny_global; //global address
int posx, posy; // position index in the array
int i,j;
int64_t m_adios_group;
uint64_t adios_groupsize, adios_totalsize;
int64_t adios_handle;
MPI_Init (&argc, &argv);
MPI_Comm_rank (comm, &rank);
MPI_Comm_size (comm, &nproc);
if (processArgs(argc, argv)) {
return 1;
}
//will work with each core writing ndx = 65, ndy = 129, (65*4,129*3) global
ndx = 65;
ndy = 129;
//2D array with block,block decomposition
posx = rank%npx; // 1st dim
posy = rank/npx; // 2nd dim
offs_x = posx * ndx;
offs_y = posy * ndy;
nx_local = ndx;
ny_local = ndy;
nx_global = npx * ndx;
ny_global = npy * ndy;
data = malloc (ndx * ndy * sizeof(double));
for( i = 0; i < ndx; i++ )
for( j = 0; j < ndy; j++)
data[i*ndy + j] = 1.0*rank;
X = malloc (ndx * ndy * sizeof(double));
for( i = 0; i < ndx; i++ )
for( j = 0; j < ndy; j++)
X[i*ndy + j] = offs_x + posy*ndx + i*ndx/ndx + (double)ndx*j/ndy;
Y = malloc (ndx * ndy * sizeof(double));
Y[0] = offs_y;
for( i = 0; i < ndx; i++ )
for( j = 0; j < ndy; j++)
Y[i*ndy + j] = offs_y + ndy*j/ndy;
char * schema_version = "1.1";
char * dimemsions = "nx_global,ny_global";
adios_init_noxml (comm);
adios_set_max_buffer_size (50);
adios_declare_group (&m_adios_group, "structured2d", "", adios_stat_default);
adios_select_method (m_adios_group, "MPI", "", "");
adios_define_var (m_adios_group, "nx_global"
,"", adios_integer
,0, 0, 0);
adios_define_var (m_adios_group, "ny_global"
,"", adios_integer
,0, 0, 0);
adios_define_var (m_adios_group, "nproc"
,"", adios_integer
,0, 0, 0);
adios_define_var (m_adios_group, "offs_x"
,"", adios_integer
,0, 0, 0);
adios_define_var (m_adios_group, "offs_y"
,"", adios_integer
,0, 0, 0);
adios_define_var (m_adios_group, "nx_local"
,"", adios_integer
,0, 0, 0);
adios_define_var (m_adios_group, "ny_local"
,"", adios_integer
,0, 0, 0);
adios_define_var (m_adios_group, "X"
,"", adios_double
,"nx_local,ny_local", "nx_global,ny_global", "offs_x,offs_y");
adios_define_var (m_adios_group, "Y"
,"", adios_double
,"nx_local,ny_local", "nx_global,ny_global", "offs_x,offs_y");
adios_define_var (m_adios_group, "data"
,"", adios_double
,"nx_local,ny_local", "nx_global,ny_global", "offs_x,offs_y");
adios_define_schema_version (m_adios_group, schema_version);
adios_define_mesh_structured (dimemsions, "X,Y", "2", m_adios_group, "structuredmesh");
adios_define_mesh_timevarying ("no", m_adios_group, "structuredmesh");
adios_define_var_mesh (m_adios_group, "data", "structuredmesh");
adios_define_var_centering (m_adios_group, "data", "point");
adios_open (&adios_handle, "structured2d", "structured2d_noxml.bp", "w", comm);
adios_groupsize = 7*sizeof(int) \
+ 3*sizeof(double) * (nx_local*ny_local);
adios_group_size (adios_handle, adios_groupsize, &adios_totalsize);
adios_write (adios_handle, "nproc", &nproc);
adios_write (adios_handle, "nx_global", &nx_global);
adios_write (adios_handle, "ny_global", &ny_global);
adios_write (adios_handle, "offs_x", &offs_x);
adios_write (adios_handle, "offs_y", &offs_y);
adios_write (adios_handle, "nx_local", &nx_local);
adios_write (adios_handle, "ny_local", &ny_local);
adios_write (adios_handle, "X", X);
adios_write (adios_handle, "Y", Y);
adios_write (adios_handle, "data", data);
adios_close (adios_handle);
MPI_Barrier (comm);
free (data);
free (X);
free (Y);
adios_finalize (rank);
MPI_Finalize ();
return 0;
}
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