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g3MPI.c
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g3MPI.c
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/*
* simMPI.c
*
* this file provides the basic communications routines for the pF3d/Z3
* codes using MPI.
*
*/
#include "grid.h"
#include "main.h"
int nodes, mp_p, mp_q, mp_r, mp_myp, mp_myq, mp_myr, mp_rank;
/*------------------------------------------------------------------------
* build_grid
*
* define a 3-D Cartesian topology atop the hardware
*/
#define REORDER FALSE
void build_grid(void)
{
int dims[3] = {0, 0, 0}; /* global size of 3-d grid */
int coord[3] = {0, 0, 0}; /* local grid position */
int periods[3] = {TRUE, TRUE, TRUE}; /* periodic in each dimension */
int temp[3]; /* for allocating x/y/z comms */
MPI_Comm_rank(MPI_COMM_WORLD, &g3.me);
MPI_Comm_size(MPI_COMM_WORLD, &g3.nproc);
#if defined(DEBUG) && (DEBUG>128)
/* print this out for debugging purposes */
(void) printf("bld[%d]: Process %d, size %d\n", g3.me, g3.me, g3.nproc);
#endif
dims[MP_X] = mp_p;
dims[MP_Y] = mp_q;
dims[MP_Z] = mp_r;
MPI_Dims_create(g3.nproc, 3, dims);
g3.P = dims[MP_X];
g3.Q = dims[MP_Y];
g3.R = dims[MP_Z];
MPI_Cart_create(MPI_COMM_WORLD, 3, dims, periods, REORDER, &g3.gridcom);
MPI_Cart_get(g3.gridcom, 3, dims, periods, coord);
g3.myP = coord[MP_X];
g3.myQ = coord[MP_Y];
g3.myR = coord[MP_Z];
#if defined(DEBUG) && (DEBUG>128)
if (g3.me == master)
(void) printf("bld[0]: size of mesh is %d by %d by %d\n", g3.P, g3.Q, g3.R);
(void) printf("bld[%d]: coord is (%d,%d,%d)\n", g3.me, g3.myP, g3.myQ, g3.myR);
#endif
/* get six neighbors (0=W, 1=E, 2=S, 3=N, 4=D, 5=U) */
/* guard against negative node numbers because IBM MPI doesn't handle that */
coord[MP_X] = ( g3.myP - 1 + g3.P ) % g3.P;
coord[MP_Y] = g3.myQ;
coord[MP_Z] = g3.myR;
MPI_Cart_rank(g3.gridcom, coord, &g3.nbr[0]);
coord[MP_X] = ( g3.myP + 1 ) % g3.P;
coord[MP_Y] = g3.myQ;
coord[MP_Z] = g3.myR;
MPI_Cart_rank(g3.gridcom, coord, &g3.nbr[1]);
coord[MP_X] = g3.myP;
coord[MP_Y] = ( g3.myQ - 1 + g3.Q ) % g3.Q;
coord[MP_Z] = g3.myR;
MPI_Cart_rank(g3.gridcom, coord, &g3.nbr[2]);
coord[MP_X] = g3.myP;
coord[MP_Y] = ( g3.myQ + 1 ) % g3.Q;
coord[MP_Z] = g3.myR;
MPI_Cart_rank(g3.gridcom, coord, &g3.nbr[3]);
coord[MP_X] = g3.myP;
coord[MP_Y] = g3.myQ;
coord[MP_Z] = ( g3.myR - 1 + g3.R ) % g3.R;
MPI_Cart_rank(g3.gridcom, coord, &g3.nbr[4]);
coord[MP_X] = g3.myP;
coord[MP_Y] = g3.myQ;
coord[MP_Z] = ( g3.myR + 1 ) % g3.R;
MPI_Cart_rank(g3.gridcom, coord, &g3.nbr[5]);
#if defined(DEBUG) && (DEBUG>128)
(void) printf("bld[%d]: nbrs = %d/%d/%d/%d/%d/%d (EWNSUD)\n", g3.me,
g3.nbr[1], g3.nbr[0], g3.nbr[3], g3.nbr[2], g3.nbr[5], g3.nbr[4]);
#endif
/* define z communicator */
temp[MP_X] = FALSE; temp[MP_Y] = FALSE; temp[MP_Z] = TRUE;
MPI_Cart_sub(g3.gridcom, temp, &g3.zcom);
/* get z neighbors (DOWN and UP) */
coord[0] = ( g3.myR - 1 + g3.R ) % g3.R;
MPI_Cart_rank(g3.zcom, coord, &g3.znbr[BEFORE]);
coord[0] = ( g3.myR + 1 ) % g3.R;
MPI_Cart_rank(g3.zcom, coord, &g3.znbr[AFTER]);
/* define y communicator */
temp[MP_X] = FALSE; temp[MP_Y] = TRUE; temp[MP_Z] = FALSE;
MPI_Cart_sub(g3.gridcom, temp, &g3.ycom);
/* get y neighbors (SOUTH and NORTH) */
coord[0] = ( g3.myQ - 1 + g3.Q ) % g3.Q;
MPI_Cart_rank(g3.ycom, coord, &g3.ynbr[BEFORE]);
coord[0] = ( g3.myQ + 1 ) % g3.Q;
MPI_Cart_rank(g3.ycom, coord, &g3.ynbr[AFTER]);
/* define x communicator */
temp[MP_X] = TRUE; temp[MP_Y] = FALSE; temp[MP_Z] = FALSE;
MPI_Cart_sub(g3.gridcom, temp, &g3.xcom);
/* get y neighbors (WEST and EAST) */
coord[0] = ( g3.myP - 1 + g3.P ) % g3.P;
MPI_Cart_rank(g3.xcom, coord, &g3.xnbr[BEFORE]);
coord[0] = ( g3.myP + 1 ) % g3.P;
MPI_Cart_rank(g3.xcom, coord, &g3.xnbr[AFTER]);
/* define xy-communicator for sub-global collective operations */
temp[MP_X] = TRUE;temp[MP_Y] = TRUE; temp[MP_Z] = FALSE;
MPI_Cart_sub(g3.gridcom, temp, &g3.xycom);
/* get diagonal xy neighbor */
#ifdef ORIG_ORDER
coord[0] = (g3.P -1 - g3.myP);
coord[1] = (g3.Q -1 - g3.myQ);
#else
coord[1] = (g3.P -1 - g3.myP);
coord[0] = (g3.Q -1 - g3.myQ);
#endif
MPI_Cart_rank(g3.xycom, coord, &g3.diag);
/* define the MPI_STATE typemap for mfhydro communications */
MPI_Type_contiguous(MAXNEQ, MPI_SINGLE, &g3.MPI_STATE);
MPI_Type_commit(&g3.MPI_STATE);
/* export some info */
mp_p = g3.P; mp_q = g3.Q; mp_r = g3.R;
mp_myp = g3.myP; mp_myq = g3.myQ; mp_myr = g3.myR;
mp_rank= g3.me;
}
/*------------------------------------------------------------------------
* simdone
*
* simulation is finished, exit the message passing.
*/
void simdone(void)
{
MPI_Finalize();
}
/*------------------------------------------------------------------------
* siminit
*
* initialize parallel simulation
*/
void siminit(int *ac, char **av[])
{
/* initialize; get rank and size information */
MPI_Init(ac,av);
MPI_Comm_rank(MPI_COMM_WORLD, &g3.me);
MPI_Comm_size(MPI_COMM_WORLD, &g3.nproc);
}
/*------------------------------------------------------------------------
* simsync
*
* synchronize entire grid
*/
void simsync(void)
{
double tim0, tim1;
MPI_Barrier(g3.gridcom);
}