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| #define MULTIGRID_MPI 1
typedef struct {
Boundary b;
MPI_Comm cartcomm;
} MpiBoundary;
foreach_dimension()
static void * snd_x (int i, int dst, int tag, int level, scalar * list,
MPI_Request * req)
{
if (dst == MPI_PROC_NULL)
return NULL;
size_t size = 0;
for (scalar s in list)
size += s.block;
size *= pow((1 << level) + 2*GHOSTS, dimension - 1)*GHOSTS*sizeof(double);
double * buf = (double *) malloc (size), * b = buf;
foreach_slice_x (i, i + GHOSTS, level)
for (scalar s in list) {
memcpy (b, &s[], sizeof(double)*s.block);
b += s.block;
}
MPI_Isend (buf, size, MPI_BYTE, dst, tag, MPI_COMM_WORLD, req);
return buf;
}
foreach_dimension()
static void rcv_x (int i, int src, int tag, int level, scalar * list)
{
if (src == MPI_PROC_NULL)
return;
size_t size = 0;
for (scalar s in list)
size += s.block;
size *= pow((1 << level) + 2*GHOSTS, dimension - 1)*GHOSTS*sizeof(double);
double * buf = (double *) malloc (size), * b = buf;
MPI_Status s;
MPI_Recv (buf, size, MPI_BYTE, src, tag, MPI_COMM_WORLD, &s);
foreach_slice_x (i, i + GHOSTS, level)
for (scalar s in list) {
memcpy (&s[], b, sizeof(double)*s.block);
b += s.block;
}
free (buf);
}
trace
static void mpi_boundary_level (const Boundary * b, scalar * list, int level)
{
scalar * list1 = NULL;
for (scalar s in list)
if (!is_constant(s) && s.block > 0)
list1 = list_add (list1, s);
if (!list1)
return;
prof_start ("mpi_boundary_level");
if (level < 0) level = depth();
MpiBoundary * mpi = (MpiBoundary *) b;
struct { int x, y, z; } dir = {0,1,2};
foreach_dimension() {
int left, right;
MPI_Cart_shift (mpi->cartcomm, dir.x, 1, &left, &right);
MPI_Request reqs[2];
void * buf[2];
int npl = (1 << level) + 2*GHOSTS, nr = 0;
if ((buf[0] = snd_x (npl - 2*GHOSTS, right, 0, level, list1, &reqs[nr])))
nr++;
if ((buf[1] = snd_x (2, left, 1, level, list1, &reqs[nr])))
nr++;
rcv_x (0, left, 0, level, list1);
rcv_x (npl - GHOSTS, right, 1, level, list1);
MPI_Status stats[nr];
MPI_Waitall (nr, reqs, stats);
free (buf[0]); free (buf[1]);
}
free (list1);
prof_stop();
}
static void mpi_boundary_destroy (Boundary * b)
{
MpiBoundary * m = (MpiBoundary *) b;
MPI_Comm_free (&m->cartcomm);
free (m);
}
Boundary * mpi_boundary_new()
{
MpiBoundary * m = qcalloc (1, MpiBoundary);
MPI_Dims_create (npe(), dimension, mpi_dims);
MPI_Cart_create (MPI_COMM_WORLD, dimension,
mpi_dims, &Period.x, 0, &m->cartcomm);
MPI_Cart_coords (m->cartcomm, pid(), dimension, mpi_coords);
// make sure other boundary conditions are not applied
struct { int x, y, z; } dir = {0,1,2};
foreach_dimension() {
int l, r;
MPI_Cart_shift (m->cartcomm, dir.x, 1, &l, &r);
if (l != MPI_PROC_NULL)
periodic_boundary (left);
if (r != MPI_PROC_NULL)
periodic_boundary (right);
}
// rescale the resolution
N /= mpi_dims[0];
int r = 0;
while (N > 1)
N /= 2, r++;
grid->depth = grid->maxdepth = r;
N = mpi_dims[0]*(1 << r);
grid->n = 1 << dimension*depth();
grid->tn = npe()*grid->n;
// setup boundary methods and add to list of boundary conditions
Boundary * b = (Boundary *) m;
b->level = mpi_boundary_level;
b->destroy = mpi_boundary_destroy;
add_boundary (b);
return b;
}
trace
double z_indexing (scalar index, bool leaves)
{
long i;
if (leaves)
i = pid()*(1 << dimension*depth());
else
i = pid()*((1 << dimension*(depth() + 1)) - 1)/((1 << dimension) - 1);
foreach_cell() {
if (!leaves || is_leaf(cell))
index[] = i++;
if (is_leaf(cell))
continue;
}
boundary ({index});
return pid() == 0 ? i*npe() - 1 : -1;
}
|
