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#include "Bdef.h"
#if (INTFACE == C_CALL)
void Cblacs_gridmap(Int *ConTxt, Int *usermap, Int ldup, Int nprow0, Int npcol0)
#else
F_VOID_FUNC blacs_gridmap_(Int *ConTxt, Int *usermap, Int *ldup, Int *nprow0,
Int *npcol0)
#endif
{
void Cblacs_pinfo(Int *, Int *);
void Cblacs_get(Int, Int, Int *);
MPI_Comm Cblacs2sys_handle(Int BlacsCtxt);
MPI_Comm BI_TransUserComm(Int, Int, Int *);
MpiInt Iam;
Int info, i, j, *iptr;
Int myrow, mycol, nprow, npcol, Ng;
BLACSCONTEXT *ctxt, **tCTxts;
MPI_Comm comm, tcomm;
MPI_Group grp, tgrp;
extern BLACSCONTEXT **BI_MyContxts;
extern BLACBUFF BI_AuxBuff;
extern Int BI_Iam, BI_Np, BI_MaxNCtxt;
extern MPI_Status *BI_Stats;
/*
* If first call to blacs_gridmap
*/
if (BI_MaxNCtxt == 0)
{
Cblacs_pinfo(&BI_Iam, &BI_Np);
BI_AuxBuff.nAops = 0;
BI_AuxBuff.Aops = (MPI_Request*)malloc(BI_Np*sizeof(*BI_AuxBuff.Aops));
BI_Stats = (MPI_Status *) malloc(BI_Np * sizeof(MPI_Status));
}
nprow = Mpval(nprow0);
npcol = Mpval(npcol0);
Ng = nprow * npcol;
if ( (Ng > BI_Np) || (nprow < 1) || (npcol < 1) )
BI_BlacsErr((Int)-1, (Int)-1, "BLACS_GRIDINIT/BLACS_GRIDMAP",
"Illegal grid (%d x %d), #procs=%d", nprow, npcol, BI_Np);
/*
* Form MPI communicator for scope = 'all'
*/
if (Ng > 2) i = Ng;
else i = 2;
iptr = (Int *) malloc(i*sizeof(Int));
for (j=0; j < npcol; j++)
{
for (i=0; i < nprow; i++) iptr[i*npcol+j] = usermap[j*Mpval(ldup)+i];
}
#if (INTFACE == C_CALL)
MpiInt *miptr = (MpiInt *) malloc(Ng*sizeof(MpiInt));
for (j=0; j < Ng; j++) miptr[j] = iptr[j];
tcomm = Cblacs2sys_handle(*ConTxt);
MPI_Comm_group(tcomm, &grp); /* find input comm's group */
MPI_Group_incl(grp, Ng, miptr, &tgrp); /* form new group */
MPI_Comm_create(tcomm, tgrp, &comm); /* create new comm */
MPI_Group_free(&tgrp);
MPI_Group_free(&grp);
free(miptr);
#else /* gridmap called from fortran */
comm = BI_TransUserComm(*ConTxt, Ng, iptr);
#endif
/*
* Weed out callers who are not participating in present grid
*/
if (comm == MPI_COMM_NULL)
{
*ConTxt = NOTINCONTEXT;
free(iptr);
return;
}
/*
* ==================================================
* Get new context and add it to my array of contexts
* ==================================================
*/
ctxt = (BLACSCONTEXT *) malloc(sizeof(BLACSCONTEXT));
/*
* Find free slot in my context array
*/
for (i=0; i < BI_MaxNCtxt; i++) if (BI_MyContxts[i] == NULL) break;
/*
* Get bigger context pointer array, if needed
*/
if (i == BI_MaxNCtxt)
{
j = BI_MaxNCtxt + MAXNCTXT;
tCTxts = (BLACSCONTEXT **) malloc(j * sizeof(*tCTxts));
for (i=0; i < BI_MaxNCtxt; i++) tCTxts[i] = BI_MyContxts[i];
BI_MaxNCtxt = j;
for(j=i; j < BI_MaxNCtxt; j++) tCTxts[j] = NULL;
if (BI_MyContxts) free(BI_MyContxts);
BI_MyContxts = tCTxts;
}
BI_MyContxts[i] = ctxt;
*ConTxt = i;
ctxt->ascp.comm = comm;
MPI_Comm_dup(comm, &ctxt->pscp.comm); /* copy acomm for pcomm */
MPI_Comm_rank(comm, &Iam); /* find my rank in new comm */
myrow = Iam / npcol;
mycol = Iam % npcol;
/*
* Form MPI communicators for scope = 'row'
*/
MPI_Comm_split(comm, myrow, mycol, &ctxt->rscp.comm);
/*
* Form MPI communicators for scope = 'Column'
*/
MPI_Comm_split(comm, mycol, myrow, &ctxt->cscp.comm);
ctxt->rscp.Np = npcol;
ctxt->rscp.Iam = mycol;
ctxt->cscp.Np = nprow;
ctxt->cscp.Iam = myrow;
ctxt->pscp.Np = ctxt->ascp.Np = Ng;
ctxt->pscp.Iam = ctxt->ascp.Iam = Iam;
ctxt->Nr_bs = ctxt->Nr_co = 1;
ctxt->Nb_bs = ctxt->Nb_co = 2;
ctxt->TopsRepeat = ctxt->TopsCohrnt = 0;
/*
* ===========================
* Set up the message id stuff
* ===========================
*/
Cblacs_get(-1, 1, iptr);
ctxt->pscp.MinId = ctxt->rscp.MinId = ctxt->cscp.MinId =
ctxt->ascp.MinId = ctxt->pscp.ScpId = ctxt->rscp.ScpId =
ctxt->cscp.ScpId = ctxt->ascp.ScpId = iptr[0];
ctxt->pscp.MaxId = ctxt->rscp.MaxId = ctxt->cscp.MaxId =
ctxt->ascp.MaxId = iptr[1];
free(iptr);
}
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