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/*@@
@file PostSendGA.c
@date Wed Feb 2 11:58:14 2000
@author Gabrielle Allen
@desc
The send of the three-way pugh communcations branch
which is @seefile PostReceiveGA.c, @seefile PostSendGA.c
and @seefile FinishReceiveGA.c. See the documentation for
@seeroutine PostSendGA for details on this routine.
@enddesc
@version $Header$
@@*/
/* #define DEBUG_PUGH 1 */
#include <stdio.h>
#include <string.h>
#include "cctk.h"
#include "pugh.h"
static const char *rcsid = "$Header$";
CCTK_FILEVERSION(CactusPUGH_PUGH_PostSendGA_c);
#ifdef CCTK_MPI
void PostSendGA(pGH *pughGH, int dir, pComm *comm);
/*@@
@routine PostSendGA
@date Thu Apr 3 11:58:59 1997
@author Paul Walker
@desc
This routine posts an asyncronous MPI send of a buffer
for a face (MPI_Isend). It does this by first packing up
a send buffer (allocated in @seeroutine PUGH_SetupGArrayGroupComm) then
sending it out on the pipe.
<p>
Since this is an asynchronous communications model we
assume that a recieve has been posted for the send.
thus the correct calling order for this is as in
@seeroutine PUGH_Sync, eg, after a Recv.
<p>
Note this does <b>not</b> wait on the send buffer from previous
communications. It is the users responsibility to wait on
that buffer.
@enddesc
@calledby PUGH_Sync
@history
@hdate Nov 4 1998 @hauthor Gabrielle Allen
@hdesc Allow for forced synchronization of all GFs with storage
@endhistory
@@*/
void PostSendGA(pGH *pughGH, int dir, pComm *comm)
{
pGA *GA;
int stag, dircomp;
int neighbour;
int i, dim, copy_bytes, offset;
char *copy_from, *copy_to;
int *istart, *iend, *iterator;
GA = (pGA *) pughGH->variables[comm->first_var][0];
/* return if no storage assigned */
if (! GA->storage)
{
return;
}
/* return if communication not required and no forced synchronisation */
if (! (pughGH->forceSync || comm->docomm[dir]))
{
return;
}
/* return if there is no neighbour in the given direction */
neighbour = GA->connectivity->neighbours[pughGH->myproc][dir];
if (neighbour < 0)
{
return;
}
dircomp = dir+1; /* Complementary direction */
if (dircomp % 2 == 0)
{
dircomp = dir-1;
}
/* note this is the complement of the rtag set in PostReceiveGA */
stag = 1000 + dircomp + 2 * (neighbour + pughGH->nprocs * GA->id);
/* mod the tag to force MPI compliance */
stag = stag % 32768;
#ifdef DEBUG_PUGH
printf ("PostSendGA: into direction %d to proc %d with stag %d size %d for "
"%d vars starting with '%s'\n",
dir, neighbour, stag, comm->buffer_sz[dir], comm->n_vars, GA->name);
#endif
if (pughGH->commmodel == PUGH_ALLOCATEDBUFFERS)
{
istart = GA->extras->overlap[0][dir];
iend = GA->extras->overlap[1][dir];
iterator = GA->extras->iterator;
if (iend[0] > GA->extras->nsize[0])
{
CCTK_WARN (CCTK_WARN_ABORT, "Internal error in communication descriptor: Trying to send data that don't exist. (This may happen if a process has too few grid points.)");
}
/* set iterator to the start vector */
for(dim = 0; dim < GA->extras->dim; dim++)
{
iterator[dim] = istart[dim];
}
/* get the source and the number of bytes to copy in the lowest dimension */
copy_to = comm->send_buffer[dir];
copy_bytes = (iend[0] - istart[0]) * GA->varsize;
/* now do the nested loops starting with the innermost */
dim = 1;
while (1)
{
/* check for end of current loop */
if (GA->extras->dim > 1 && iterator[dim] >= iend[dim])
{
/* increment outermost loopers */
for (dim++; dim < GA->extras->dim; dim++)
{
iterator[dim]++;
if (iterator[dim] < iend[dim])
{
break;
}
}
/* done if beyond outermost loop */
if (dim >= GA->extras->dim)
{
break;
}
/* reset innermost loopers */
for (dim--; dim > 0; dim--)
{
iterator[dim] = istart[dim];
}
dim = 1;
}
/* get the linear offset */
offset = istart[0];
for (i = 1; i < GA->extras->dim; i++)
{
offset += iterator[i] * GA->extras->hyper_volume[i];
}
offset *= GA->varsize;
/* copy the data in dimension 0 */
for (i = comm->first_var; i < comm->first_var + comm->n_vars; i++)
{
copy_from = ((pGA *) pughGH->variables[i][comm->sync_timelevel])->data;
memcpy (copy_to, copy_from + offset, copy_bytes);
copy_to += copy_bytes;
}
if (GA->extras->dim > 1)
{
/* increment current looper */
iterator[dim]++;
}
else
{
/* exit loop if array dim is 1D */
break;
}
} /* end of nested loops over all dimensions */
/* now post send */
CACTUS_MPI_ERROR (MPI_Isend (comm->send_buffer[dir],
comm->buffer_sz[dir], comm->mpi_type,
neighbour, stag,
pughGH->PUGH_COMM_WORLD, &comm->sreq[dir]));
}
#ifdef PUGH_WITH_DERIVED_DATATYPES
else if (pughGH->commmodel == PUGH_DERIVEDTYPES)
{
int var;
MPI_Datatype *send_dt;
switch (GA->vtype)
{
case CCTK_VARIABLE_BYTE:
send_dt = pughGH->send_char_dt;
break;
case CCTK_VARIABLE_INT:
send_dt = pughGH->send_int_dt;
break;
case CCTK_VARIABLE_REAL:
send_dt = pughGH->send_real_dt;
break;
case CCTK_VARIABLE_COMPLEX:
send_dt = pughGH->send_complex_dt;
break;
default:
CCTK_WARN (1, "Unknown variable type in PostSendGA");
return;
}
for (var = comm->first_var; var < comm->first_var + comm->n_vars; var++)
{
pGA *GA = (pGA *) pughGH->variables[var][comm->sync_timelevel];
CACTUS_MPI_ERROR (MPI_Isend (GA->data,
1, send_dt[dir],
neighbour, (stag + var) % 32768,
pughGH->PUGH_COMM_WORLD,
&GA->comm->sreq[dir]));
CACTUS_MPI_ERROR (MPI_Request_free (&comm->sreq[dir]));
}
}
#endif
}
#endif /* CCTK_MPI */
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