/*! \brief
*
* <pre>
* Purpose
* =======
* Perform local block modifications: lsum[i] -= L_i,k * X[k].
* </pre>
*/
void dlsum_fmod
/************************************************************************/
(
double *lsum, /* Sum of local modifications. */
double *x, /* X array (local) */
double *xk, /* X[k]. */
double *rtemp, /* Result of full matrix-vector multiply. */
int nrhs, /* Number of right-hand sides. */
int knsupc, /* Size of supernode k. */
int_t k, /* The k-th component of X. */
int_t *fmod, /* Modification count for L-solve. */
int_t nlb, /* Number of L blocks. */
int_t lptr, /* Starting position in lsub[*]. */
int_t luptr, /* Starting position in lusup[*]. */
int_t *xsup,
gridinfo_t *grid,
LocalLU_t *Llu,
MPI_Request send_req[],
SuperLUStat_t *stat
)
{
double alpha = 1.0, beta = 0.0;
double *lusup, *lusup1;
double *dest;
int iam, iknsupc, myrow, nbrow, nsupr, nsupr1, p, pi;
int_t i, ii, ik, il, ikcol, irow, j, lb, lk, rel;
int_t *lsub, *lsub1, nlb1, lptr1, luptr1;
int_t *ilsum = Llu->ilsum; /* Starting position of each supernode in lsum. */
int_t *frecv = Llu->frecv;
int_t **fsendx_plist = Llu->fsendx_plist;
MPI_Status status;
int test_flag;
iam = grid->iam;
myrow = MYROW( iam, grid );
lk = LBj( k, grid ); /* Local block number, column-wise. */
lsub = Llu->Lrowind_bc_ptr[lk];
lusup = Llu->Lnzval_bc_ptr[lk];
nsupr = lsub[1];
for (lb = 0; lb < nlb; ++lb) {
ik = lsub[lptr]; /* Global block number, row-wise. */
nbrow = lsub[lptr+1];
#ifdef _CRAY
SGEMM( ftcs2, ftcs2, &nbrow, &nrhs, &knsupc,
&alpha, &lusup[luptr], &nsupr, xk,
&knsupc, &beta, rtemp, &nbrow );
#else
dgemm_( "N", "N", &nbrow, &nrhs, &knsupc,
&alpha, &lusup[luptr], &nsupr, xk,
&knsupc, &beta, rtemp, &nbrow );
#endif
stat->ops[SOLVE] += 2 * nbrow * nrhs * knsupc + nbrow * nrhs;
lk = LBi( ik, grid ); /* Local block number, row-wise. */
iknsupc = SuperSize( ik );
il = LSUM_BLK( lk );
dest = &lsum[il];
lptr += LB_DESCRIPTOR;
rel = xsup[ik]; /* Global row index of block ik. */
for (i = 0; i < nbrow; ++i) {
irow = lsub[lptr++] - rel; /* Relative row. */
RHS_ITERATE(j)
dest[irow + j*iknsupc] -= rtemp[i + j*nbrow];
}
luptr += nbrow;
if ( (--fmod[lk])==0 ) { /* Local accumulation done. */
ikcol = PCOL( ik, grid );
p = PNUM( myrow, ikcol, grid );
if ( iam != p ) {
#ifdef ISEND_IRECV
MPI_Isend( &lsum[il - LSUM_H], iknsupc * nrhs + LSUM_H,
MPI_DOUBLE, p, LSUM, grid->comm,
&send_req[Llu->SolveMsgSent++] );
#else
#ifdef BSEND
MPI_Bsend( &lsum[il - LSUM_H], iknsupc * nrhs + LSUM_H,
MPI_DOUBLE, p, LSUM, grid->comm );
#else
MPI_Send( &lsum[il - LSUM_H], iknsupc * nrhs + LSUM_H,
MPI_DOUBLE, p, LSUM, grid->comm );
#endif
#endif
#if ( DEBUGlevel>=2 )
printf("(%2d) Sent LSUM[%2.0f], size %2d, to P %2d\n",
iam, lsum[il-LSUM_H], iknsupc*nrhs+LSUM_H, p);
#endif
} else { /* Diagonal process: X[i] += lsum[i]. */
ii = X_BLK( lk );
RHS_ITERATE(j)
for (i = 0; i < iknsupc; ++i)
x[i + ii + j*iknsupc] += lsum[i + il + j*iknsupc];
if ( frecv[lk]==0 ) { /* Becomes a leaf node. */
fmod[lk] = -1; /* Do not solve X[k] in the future. */
lk = LBj( ik, grid );/* Local block number, column-wise. */
lsub1 = Llu->Lrowind_bc_ptr[lk];
lusup1 = Llu->Lnzval_bc_ptr[lk];
nsupr1 = lsub1[1];
#ifdef _CRAY
STRSM(ftcs1, ftcs1, ftcs2, ftcs3, &iknsupc, &nrhs, &alpha,
lusup1, &nsupr1, &x[ii], &iknsupc);
#else
dtrsm_("L", "L", "N", "U", &iknsupc, &nrhs, &alpha,
lusup1, &nsupr1, &x[ii], &iknsupc);
#endif
stat->ops[SOLVE] += iknsupc * (iknsupc - 1) * nrhs;
#if ( DEBUGlevel>=2 )
printf("(%2d) Solve X[%2d]\n", iam, ik);
#endif
/*
* Send Xk to process column Pc[k].
*/
for (p = 0; p < grid->nprow; ++p) {
if ( fsendx_plist[lk][p] != EMPTY ) {
pi = PNUM( p, ikcol, grid );
#ifdef ISEND_IRECV
MPI_Isend( &x[ii - XK_H], iknsupc * nrhs + XK_H,
MPI_DOUBLE, pi, Xk, grid->comm,
&send_req[Llu->SolveMsgSent++] );
#else
#ifdef BSEND
MPI_Bsend( &x[ii - XK_H], iknsupc * nrhs + XK_H,
MPI_DOUBLE, pi, Xk, grid->comm );
#else
MPI_Send( &x[ii - XK_H], iknsupc * nrhs + XK_H,
MPI_DOUBLE, pi, Xk, grid->comm );
#endif
#endif
#if ( DEBUGlevel>=2 )
printf("(%2d) Sent X[%2.0f] to P %2d\n",
iam, x[ii-XK_H], pi);
#endif
}
}
/*
* Perform local block modifications.
*/
nlb1 = lsub1[0] - 1;
lptr1 = BC_HEADER + LB_DESCRIPTOR + iknsupc;
luptr1 = iknsupc; /* Skip diagonal block L(I,I). */
dlsum_fmod(lsum, x, &x[ii], rtemp, nrhs, iknsupc, ik,
fmod, nlb1, lptr1, luptr1, xsup,
grid, Llu, send_req, stat);
} /* if frecv[lk] == 0 */
} /* if iam == p */
} /* if fmod[lk] == 0 */
} /* for lb ... */
void
pzgstrs(int_t n, LUstruct_t *LUstruct,
ScalePermstruct_t *ScalePermstruct,
gridinfo_t *grid, doublecomplex *B,
int_t m_loc, int_t fst_row, int_t ldb, int nrhs,
SOLVEstruct_t *SOLVEstruct,
SuperLUStat_t *stat, int *info)
{
/*
* Purpose
* =======
*
* PZGSTRS solves a system of distributed linear equations
* A*X = B with a general N-by-N matrix A using the LU factorization
* computed by PZGSTRF.
* If the equilibration, and row and column permutations were performed,
* the LU factorization was performed for A1 where
* A1 = Pc*Pr*diag(R)*A*diag(C)*Pc^T = L*U
* and the linear system solved is
* A1 * Y = Pc*Pr*B1, where B was overwritten by B1 = diag(R)*B, and
* the permutation to B1 by Pc*Pr is applied internally in this routine.
*
* Arguments
* =========
*
* n (input) int (global)
* The order of the system of linear equations.
*
* LUstruct (input) LUstruct_t*
* The distributed data structures storing L and U factors.
* The L and U factors are obtained from PZGSTRF for
* the possibly scaled and permuted matrix A.
* See superlu_zdefs.h for the definition of 'LUstruct_t'.
* A may be scaled and permuted into A1, so that
* A1 = Pc*Pr*diag(R)*A*diag(C)*Pc^T = L*U
*
* grid (input) gridinfo_t*
* The 2D process mesh. It contains the MPI communicator, the number
* of process rows (NPROW), the number of process columns (NPCOL),
* and my process rank. It is an input argument to all the
* parallel routines.
* Grid can be initialized by subroutine SUPERLU_GRIDINIT.
* See superlu_defs.h for the definition of 'gridinfo_t'.
*
* B (input/output) doublecomplex*
* On entry, the distributed right-hand side matrix of the possibly
* equilibrated system. That is, B may be overwritten by diag(R)*B.
* On exit, the distributed solution matrix Y of the possibly
* equilibrated system if info = 0, where Y = Pc*diag(C)^(-1)*X,
* and X is the solution of the original system.
*
* m_loc (input) int (local)
* The local row dimension of matrix B.
*
* fst_row (input) int (global)
* The row number of B's first row in the global matrix.
*
* ldb (input) int (local)
* The leading dimension of matrix B.
*
* nrhs (input) int (global)
* Number of right-hand sides.
*
* SOLVEstruct (output) SOLVEstruct_t* (global)
* Contains the information for the communication during the
* solution phase.
*
* stat (output) SuperLUStat_t*
* Record the statistics about the triangular solves.
* See util.h for the definition of 'SuperLUStat_t'.
*
* info (output) int*
* = 0: successful exit
* < 0: if info = -i, the i-th argument had an illegal value
*
*/
Glu_persist_t *Glu_persist = LUstruct->Glu_persist;
LocalLU_t *Llu = LUstruct->Llu;
doublecomplex alpha = {1.0, 0.0};
doublecomplex zero = {0.0, 0.0};
doublecomplex *lsum; /* Local running sum of the updates to B-components */
doublecomplex *x; /* X component at step k. */
/* NOTE: x and lsum are of same size. */
doublecomplex *lusup, *dest;
doublecomplex *recvbuf, *tempv;
doublecomplex *rtemp; /* Result of full matrix-vector multiply. */
int_t **Ufstnz_br_ptr = Llu->Ufstnz_br_ptr;
int_t *Urbs, *Urbs1; /* Number of row blocks in each block column of U. */
Ucb_indptr_t **Ucb_indptr;/* Vertical linked list pointing to Uindex[] */
int_t **Ucb_valptr; /* Vertical linked list pointing to Unzval[] */
int_t iam, kcol, krow, mycol, myrow;
int_t i, ii, il, j, jj, k, lb, ljb, lk, lptr, luptr;
int_t nb, nlb, nub, nsupers;
int_t *xsup, *supno, *lsub, *usub;
int_t *ilsum; /* Starting position of each supernode in lsum (LOCAL)*/
int_t Pc, Pr;
int knsupc, nsupr;
int ldalsum; /* Number of lsum entries locally owned. */
int maxrecvsz, p, pi;
int_t **Lrowind_bc_ptr;
doublecomplex **Lnzval_bc_ptr;
MPI_Status status;
#ifdef ISEND_IRECV
MPI_Request *send_req, recv_req;
#endif
pxgstrs_comm_t *gstrs_comm = SOLVEstruct->gstrs_comm;
/*-- Counts used for L-solve --*/
int_t *fmod; /* Modification count for L-solve --
Count the number of local block products to
be summed into lsum[lk]. */
int_t **fsendx_plist = Llu->fsendx_plist;
int_t nfrecvx = Llu->nfrecvx; /* Number of X components to be recv'd. */
int_t *frecv; /* Count of lsum[lk] contributions to be received
from processes in this row.
It is only valid on the diagonal processes. */
int_t nfrecvmod = 0; /* Count of total modifications to be recv'd. */
int_t nleaf = 0, nroot = 0;
/*-- Counts used for U-solve --*/
int_t *bmod; /* Modification count for U-solve. */
int_t **bsendx_plist = Llu->bsendx_plist;
int_t nbrecvx = Llu->nbrecvx; /* Number of X components to be recv'd. */
int_t *brecv; /* Count of modifications to be recv'd from
processes in this row. */
int_t nbrecvmod = 0; /* Count of total modifications to be recv'd. */
double t;
#if ( DEBUGlevel>=2 )
int_t Ublocks = 0;
#endif
t = SuperLU_timer_();
/* Test input parameters. */
*info = 0;
if ( n < 0 ) *info = -1;
else if ( nrhs < 0 ) *info = -9;
if ( *info ) {
pxerbla("PZGSTRS", grid, -*info);
return;
}
/*
* Initialization.
*/
iam = grid->iam;
Pc = grid->npcol;
Pr = grid->nprow;
myrow = MYROW( iam, grid );
mycol = MYCOL( iam, grid );
xsup = Glu_persist->xsup;
supno = Glu_persist->supno;
nsupers = supno[n-1] + 1;
Lrowind_bc_ptr = Llu->Lrowind_bc_ptr;
Lnzval_bc_ptr = Llu->Lnzval_bc_ptr;
nlb = CEILING( nsupers, Pr ); /* Number of local block rows. */
#if ( DEBUGlevel>=1 )
CHECK_MALLOC(iam, "Enter pzgstrs()");
#endif
stat->ops[SOLVE] = 0.0;
Llu->SolveMsgSent = 0;
/* Save the count to be altered so it can be used by
subsequent call to PDGSTRS. */
if ( !(fmod = intMalloc_dist(nlb)) )
ABORT("Calloc fails for fmod[].");
for (i = 0; i < nlb; ++i) fmod[i] = Llu->fmod[i];
if ( !(frecv = intMalloc_dist(nlb)) )
ABORT("Malloc fails for frecv[].");
Llu->frecv = frecv;
#ifdef ISEND_IRECV
k = SUPERLU_MAX( Llu->nfsendx, Llu->nbsendx ) + nlb;
if ( !(send_req = (MPI_Request*) SUPERLU_MALLOC(k*sizeof(MPI_Request))) )
ABORT("Malloc fails for send_req[].");
#endif
#ifdef _CRAY
ftcs1 = _cptofcd("L", strlen("L"));
ftcs2 = _cptofcd("N", strlen("N"));
ftcs3 = _cptofcd("U", strlen("U"));
#endif
/* Obtain ilsum[] and ldalsum for process column 0. */
ilsum = Llu->ilsum;
ldalsum = Llu->ldalsum;
/* Allocate working storage. */
knsupc = sp_ienv_dist(3);
maxrecvsz = knsupc * nrhs + SUPERLU_MAX( XK_H, LSUM_H );
if ( !(lsum = doublecomplexCalloc_dist(((size_t)ldalsum)*nrhs + nlb*LSUM_H)) )
ABORT("Calloc fails for lsum[].");
if ( !(x = doublecomplexMalloc_dist(ldalsum * nrhs + nlb * XK_H)) )
ABORT("Malloc fails for x[].");
if ( !(recvbuf = doublecomplexMalloc_dist(maxrecvsz)) )
ABORT("Malloc fails for recvbuf[].");
if ( !(rtemp = doublecomplexCalloc_dist(maxrecvsz)) )
ABORT("Malloc fails for rtemp[].");
/*---------------------------------------------------
* Forward solve Ly = b.
*---------------------------------------------------*/
/* Redistribute B into X on the diagonal processes. */
pzReDistribute_B_to_X(B, m_loc, nrhs, ldb, fst_row, ilsum, x,
ScalePermstruct, Glu_persist, grid, SOLVEstruct);
/* Set up the headers in lsum[]. */
ii = 0;
for (k = 0; k < nsupers; ++k) {
knsupc = SuperSize( k );
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* Local block number. */
il = LSUM_BLK( lk );
lsum[il - LSUM_H].r = k;/* Block number prepended in the header.*/
lsum[il - LSUM_H].i = 0;
}
ii += knsupc;
}
/*
* Compute frecv[] and nfrecvmod counts on the diagonal processes.
*/
{
superlu_scope_t *scp = &grid->rscp;
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* Local block number. */
kcol = PCOL( k, grid ); /* Root process in this row scope. */
if ( mycol != kcol && fmod[lk] )
i = 1; /* Contribution from non-diagonal process. */
else i = 0;
MPI_Reduce( &i, &frecv[lk], 1, mpi_int_t,
MPI_SUM, kcol, scp->comm );
if ( mycol == kcol ) { /* Diagonal process. */
nfrecvmod += frecv[lk];
if ( !frecv[lk] && !fmod[lk] ) ++nleaf;
#if ( DEBUGlevel>=2 )
printf("(%2d) frecv[%4d] %2d\n", iam, k, frecv[lk]);
assert( frecv[lk] < Pc );
#endif
}
}
}
}
/* ---------------------------------------------------------
Solve the leaf nodes first by all the diagonal processes.
--------------------------------------------------------- */
#if ( DEBUGlevel>=2 )
printf("(%2d) nleaf %4d\n", iam, nleaf);
#endif
for (k = 0; k < nsupers && nleaf; ++k) {
krow = PROW( k, grid );
kcol = PCOL( k, grid );
if ( myrow == krow && mycol == kcol ) { /* Diagonal process */
knsupc = SuperSize( k );
lk = LBi( k, grid );
if ( frecv[lk]==0 && fmod[lk]==0 ) {
fmod[lk] = -1; /* Do not solve X[k] in the future. */
ii = X_BLK( lk );
lk = LBj( k, grid ); /* Local block number, column-wise. */
lsub = Lrowind_bc_ptr[lk];
lusup = Lnzval_bc_ptr[lk];
nsupr = lsub[1];
#ifdef _CRAY
CTRSM(ftcs1, ftcs1, ftcs2, ftcs3, &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#elif defined (USE_VENDOR_BLAS)
ztrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc, 1, 1, 1, 1);
#else
ztrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#endif
stat->ops[SOLVE] += 4 * knsupc * (knsupc - 1) * nrhs
+ 10 * knsupc * nrhs; /* complex division */
--nleaf;
#if ( DEBUGlevel>=2 )
printf("(%2d) Solve X[%2d]\n", iam, k);
#endif
/*
* Send Xk to process column Pc[k].
*/
for (p = 0; p < Pr; ++p) {
if ( fsendx_plist[lk][p] != EMPTY ) {
pi = PNUM( p, kcol, grid );
#ifdef ISEND_IRECV
MPI_Isend( &x[ii - XK_H], knsupc * nrhs + XK_H,
SuperLU_MPI_DOUBLE_COMPLEX, pi, Xk, grid->comm,
&send_req[Llu->SolveMsgSent++]);
#else
MPI_Send( &x[ii - XK_H], knsupc * nrhs + XK_H,
SuperLU_MPI_DOUBLE_COMPLEX, pi, Xk, grid->comm );
#endif
#if ( DEBUGlevel>=2 )
printf("(%2d) Sent X[%2.0f] to P %2d\n",
iam, x[ii-XK_H], pi);
#endif
}
}
/*
* Perform local block modifications: lsum[i] -= L_i,k * X[k]
*/
nb = lsub[0] - 1;
lptr = BC_HEADER + LB_DESCRIPTOR + knsupc;
luptr = knsupc; /* Skip diagonal block L(k,k). */
zlsum_fmod(lsum, x, &x[ii], rtemp, nrhs, knsupc, k,
fmod, nb, lptr, luptr, xsup, grid, Llu,
send_req, stat);
}
} /* if diagonal process ... */
} /* for k ... */
/* -----------------------------------------------------------
Compute the internal nodes asynchronously by all processes.
----------------------------------------------------------- */
#if ( DEBUGlevel>=2 )
printf("(%2d) nfrecvx %4d, nfrecvmod %4d, nleaf %4d\n",
iam, nfrecvx, nfrecvmod, nleaf);
#endif
while ( nfrecvx || nfrecvmod ) { /* While not finished. */
/* Receive a message. */
#ifdef ISEND_IRECV
/* -MPI- FATAL: Remote protocol queue full */
MPI_Irecv( recvbuf, maxrecvsz, SuperLU_MPI_DOUBLE_COMPLEX,
MPI_ANY_SOURCE, MPI_ANY_TAG, grid->comm, &recv_req );
MPI_Wait( &recv_req, &status );
#else
MPI_Recv( recvbuf, maxrecvsz, SuperLU_MPI_DOUBLE_COMPLEX,
MPI_ANY_SOURCE, MPI_ANY_TAG, grid->comm, &status );
#endif
k = (*recvbuf).r;
#if ( DEBUGlevel>=2 )
printf("(%2d) Recv'd block %d, tag %2d\n", iam, k, status.MPI_TAG);
#endif
switch ( status.MPI_TAG ) {
case Xk:
--nfrecvx;
lk = LBj( k, grid ); /* Local block number, column-wise. */
lsub = Lrowind_bc_ptr[lk];
lusup = Lnzval_bc_ptr[lk];
if ( lsub ) {
nb = lsub[0];
lptr = BC_HEADER;
luptr = 0;
knsupc = SuperSize( k );
/*
* Perform local block modifications: lsum[i] -= L_i,k * X[k]
*/
zlsum_fmod(lsum, x, &recvbuf[XK_H], rtemp, nrhs, knsupc, k,
fmod, nb, lptr, luptr, xsup, grid, Llu,
send_req, stat);
} /* if lsub */
break;
case LSUM: /* Receiver must be a diagonal process */
--nfrecvmod;
lk = LBi( k, grid ); /* Local block number, row-wise. */
ii = X_BLK( lk );
knsupc = SuperSize( k );
tempv = &recvbuf[LSUM_H];
RHS_ITERATE(j) {
for (i = 0; i < knsupc; ++i)
z_add(&x[i + ii + j*knsupc],
&x[i + ii + j*knsupc],
&tempv[i + j*knsupc]);
}
if ( (--frecv[lk])==0 && fmod[lk]==0 ) {
fmod[lk] = -1; /* Do not solve X[k] in the future. */
lk = LBj( k, grid ); /* Local block number, column-wise. */
lsub = Lrowind_bc_ptr[lk];
lusup = Lnzval_bc_ptr[lk];
nsupr = lsub[1];
#ifdef _CRAY
CTRSM(ftcs1, ftcs1, ftcs2, ftcs3, &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#elif defined (USE_VENDOR_BLAS)
ztrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc, 1, 1, 1, 1);
#else
ztrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#endif
stat->ops[SOLVE] += 4 * knsupc * (knsupc - 1) * nrhs
+ 10 * knsupc * nrhs; /* complex division */
#if ( DEBUGlevel>=2 )
printf("(%2d) Solve X[%2d]\n", iam, k);
#endif
/*
* Send Xk to process column Pc[k].
*/
kcol = PCOL( k, grid );
for (p = 0; p < Pr; ++p) {
if ( fsendx_plist[lk][p] != EMPTY ) {
pi = PNUM( p, kcol, grid );
#ifdef ISEND_IRECV
MPI_Isend( &x[ii-XK_H], knsupc * nrhs + XK_H,
SuperLU_MPI_DOUBLE_COMPLEX, pi, Xk, grid->comm,
&send_req[Llu->SolveMsgSent++]);
#else
MPI_Send( &x[ii - XK_H], knsupc * nrhs + XK_H,
SuperLU_MPI_DOUBLE_COMPLEX, pi, Xk, grid->comm );
#endif
#if ( DEBUGlevel>=2 )
printf("(%2d) Sent X[%2.0f] to P %2d\n",
iam, x[ii-XK_H], pi);
#endif
}
}
/*
* Perform local block modifications.
*/
nb = lsub[0] - 1;
lptr = BC_HEADER + LB_DESCRIPTOR + knsupc;
luptr = knsupc; /* Skip diagonal block L(k,k). */
zlsum_fmod(lsum, x, &x[ii], rtemp, nrhs, knsupc, k,
fmod, nb, lptr, luptr, xsup, grid, Llu,
send_req, stat);
} /* if */
break;
#if ( DEBUGlevel>=2 )
default:
printf("(%2d) Recv'd wrong message tag %4d\n", status.MPI_TAG);
break;
#endif
} /* switch */
} /* while not finished ... */
#if ( PRNTlevel>=2 )
t = SuperLU_timer_() - t;
if ( !iam ) printf(".. L-solve time\t%8.2f\n", t);
t = SuperLU_timer_();
#endif
#if ( DEBUGlevel==2 )
{
printf("(%d) .. After L-solve: y =\n", iam);
for (i = 0, k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
kcol = PCOL( k, grid );
if ( myrow == krow && mycol == kcol ) { /* Diagonal process */
knsupc = SuperSize( k );
lk = LBi( k, grid );
ii = X_BLK( lk );
for (j = 0; j < knsupc; ++j)
printf("\t(%d)\t%4d\t%.10f\n", iam, xsup[k]+j, x[ii+j]);
fflush(stdout);
}
MPI_Barrier( grid->comm );
}
}
#endif
SUPERLU_FREE(fmod);
SUPERLU_FREE(frecv);
SUPERLU_FREE(rtemp);
#ifdef ISEND_IRECV
for (i = 0; i < Llu->SolveMsgSent; ++i) MPI_Request_free(&send_req[i]);
Llu->SolveMsgSent = 0;
#endif
/*---------------------------------------------------
* Back solve Ux = y.
*
* The Y components from the forward solve is already
* on the diagonal processes.
*---------------------------------------------------*/
/* Save the count to be altered so it can be used by
subsequent call to PZGSTRS. */
if ( !(bmod = intMalloc_dist(nlb)) )
ABORT("Calloc fails for bmod[].");
for (i = 0; i < nlb; ++i) bmod[i] = Llu->bmod[i];
if ( !(brecv = intMalloc_dist(nlb)) )
ABORT("Malloc fails for brecv[].");
Llu->brecv = brecv;
/*
* Compute brecv[] and nbrecvmod counts on the diagonal processes.
*/
{
superlu_scope_t *scp = &grid->rscp;
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* Local block number. */
kcol = PCOL( k, grid ); /* Root process in this row scope. */
if ( mycol != kcol && bmod[lk] )
i = 1; /* Contribution from non-diagonal process. */
else i = 0;
MPI_Reduce( &i, &brecv[lk], 1, mpi_int_t,
MPI_SUM, kcol, scp->comm );
if ( mycol == kcol ) { /* Diagonal process. */
nbrecvmod += brecv[lk];
if ( !brecv[lk] && !bmod[lk] ) ++nroot;
#if ( DEBUGlevel>=2 )
printf("(%2d) brecv[%4d] %2d\n", iam, k, brecv[lk]);
assert( brecv[lk] < Pc );
#endif
}
}
}
}
/* Re-initialize lsum to zero. Each block header is already in place. */
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
knsupc = SuperSize( k );
lk = LBi( k, grid );
il = LSUM_BLK( lk );
dest = &lsum[il];
RHS_ITERATE(j) {
for (i = 0; i < knsupc; ++i) dest[i + j*knsupc] = zero;
}
}
}
void
pzgstrs(int_t n, LUstruct_t *LUstruct,
ScalePermstruct_t *ScalePermstruct,
gridinfo_t *grid, doublecomplex *B,
int_t m_loc, int_t fst_row, int_t ldb, int nrhs,
SOLVEstruct_t *SOLVEstruct,
SuperLUStat_t *stat, int *info)
{
Glu_persist_t *Glu_persist = LUstruct->Glu_persist;
LocalLU_t *Llu = LUstruct->Llu;
doublecomplex alpha = {1.0, 0.0};
doublecomplex zero = {0.0, 0.0};
doublecomplex *lsum; /* Local running sum of the updates to B-components */
doublecomplex *x; /* X component at step k. */
/* NOTE: x and lsum are of same size. */
doublecomplex *lusup, *dest;
doublecomplex *recvbuf, *tempv;
doublecomplex *rtemp; /* Result of full matrix-vector multiply. */
int_t **Ufstnz_br_ptr = Llu->Ufstnz_br_ptr;
int_t *Urbs, *Urbs1; /* Number of row blocks in each block column of U. */
Ucb_indptr_t **Ucb_indptr;/* Vertical linked list pointing to Uindex[] */
int_t **Ucb_valptr; /* Vertical linked list pointing to Unzval[] */
int_t iam, kcol, krow, mycol, myrow;
int_t i, ii, il, j, jj, k, lb, ljb, lk, lptr, luptr;
int_t nb, nlb, nub, nsupers;
int_t *xsup, *supno, *lsub, *usub;
int_t *ilsum; /* Starting position of each supernode in lsum (LOCAL)*/
int_t Pc, Pr;
int knsupc, nsupr;
int ldalsum; /* Number of lsum entries locally owned. */
int maxrecvsz, p, pi;
int_t **Lrowind_bc_ptr;
doublecomplex **Lnzval_bc_ptr;
MPI_Status status;
MPI_Request *send_req, recv_req;
pxgstrs_comm_t *gstrs_comm = SOLVEstruct->gstrs_comm;
/*-- Counts used for L-solve --*/
int_t *fmod; /* Modification count for L-solve --
Count the number of local block products to
be summed into lsum[lk]. */
int_t **fsendx_plist = Llu->fsendx_plist;
int_t nfrecvx = Llu->nfrecvx; /* Number of X components to be recv'd. */
int_t *frecv; /* Count of lsum[lk] contributions to be received
from processes in this row.
It is only valid on the diagonal processes. */
int_t nfrecvmod = 0; /* Count of total modifications to be recv'd. */
int_t nleaf = 0, nroot = 0;
/*-- Counts used for U-solve --*/
int_t *bmod; /* Modification count for U-solve. */
int_t **bsendx_plist = Llu->bsendx_plist;
int_t nbrecvx = Llu->nbrecvx; /* Number of X components to be recv'd. */
int_t *brecv; /* Count of modifications to be recv'd from
processes in this row. */
int_t nbrecvmod = 0; /* Count of total modifications to be recv'd. */
double t;
#if ( DEBUGlevel>=2 )
int_t Ublocks = 0;
#endif
int_t *mod_bit = Llu->mod_bit; /* flag contribution from each row block */
t = SuperLU_timer_();
/* Test input parameters. */
*info = 0;
if ( n < 0 ) *info = -1;
else if ( nrhs < 0 ) *info = -9;
if ( *info ) {
pxerbla("PZGSTRS", grid, -*info);
return;
}
/*
* Initialization.
*/
iam = grid->iam;
Pc = grid->npcol;
Pr = grid->nprow;
myrow = MYROW( iam, grid );
mycol = MYCOL( iam, grid );
xsup = Glu_persist->xsup;
supno = Glu_persist->supno;
nsupers = supno[n-1] + 1;
Lrowind_bc_ptr = Llu->Lrowind_bc_ptr;
Lnzval_bc_ptr = Llu->Lnzval_bc_ptr;
nlb = CEILING( nsupers, Pr ); /* Number of local block rows. */
#if ( DEBUGlevel>=1 )
CHECK_MALLOC(iam, "Enter pzgstrs()");
#endif
stat->ops[SOLVE] = 0.0;
Llu->SolveMsgSent = 0;
/* Save the count to be altered so it can be used by
subsequent call to PDGSTRS. */
if ( !(fmod = intMalloc_dist(nlb)) )
ABORT("Calloc fails for fmod[].");
for (i = 0; i < nlb; ++i) fmod[i] = Llu->fmod[i];
if ( !(frecv = intMalloc_dist(nlb)) )
ABORT("Malloc fails for frecv[].");
Llu->frecv = frecv;
k = SUPERLU_MAX( Llu->nfsendx, Llu->nbsendx ) + nlb;
if ( !(send_req = (MPI_Request*) SUPERLU_MALLOC(k*sizeof(MPI_Request))) )
ABORT("Malloc fails for send_req[].");
#ifdef _CRAY
ftcs1 = _cptofcd("L", strlen("L"));
ftcs2 = _cptofcd("N", strlen("N"));
ftcs3 = _cptofcd("U", strlen("U"));
#endif
/* Obtain ilsum[] and ldalsum for process column 0. */
ilsum = Llu->ilsum;
ldalsum = Llu->ldalsum;
/* Allocate working storage. */
knsupc = sp_ienv_dist(3);
maxrecvsz = knsupc * nrhs + SUPERLU_MAX( XK_H, LSUM_H );
if ( !(lsum = doublecomplexCalloc_dist(((size_t)ldalsum)*nrhs + nlb*LSUM_H)) )
ABORT("Calloc fails for lsum[].");
if ( !(x = doublecomplexMalloc_dist(ldalsum * nrhs + nlb * XK_H)) )
ABORT("Malloc fails for x[].");
if ( !(recvbuf = doublecomplexMalloc_dist(maxrecvsz)) )
ABORT("Malloc fails for recvbuf[].");
if ( !(rtemp = doublecomplexCalloc_dist(maxrecvsz)) )
ABORT("Malloc fails for rtemp[].");
/*---------------------------------------------------
* Forward solve Ly = b.
*---------------------------------------------------*/
/* Redistribute B into X on the diagonal processes. */
pzReDistribute_B_to_X(B, m_loc, nrhs, ldb, fst_row, ilsum, x,
ScalePermstruct, Glu_persist, grid, SOLVEstruct);
/* Set up the headers in lsum[]. */
ii = 0;
for (k = 0; k < nsupers; ++k) {
knsupc = SuperSize( k );
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* Local block number. */
il = LSUM_BLK( lk );
lsum[il - LSUM_H].r = k;/* Block number prepended in the header.*/
lsum[il - LSUM_H].i = 0;
}
ii += knsupc;
}
/*
* Compute frecv[] and nfrecvmod counts on the diagonal processes.
*/
{
superlu_scope_t *scp = &grid->rscp;
#if 1
for (k = 0; k < nlb; ++k) mod_bit[k] = 0;
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* local block number */
kcol = PCOL( k, grid );
if ( mycol != kcol && fmod[lk] )
mod_bit[lk] = 1; /* contribution from off-diagonal */
}
}
/*PrintInt10("mod_bit", nlb, mod_bit);*/
#if ( PROFlevel>=2 )
t_reduce_tmp = SuperLU_timer_();
#endif
/* Every process receives the count, but it is only useful on the
diagonal processes. */
MPI_Allreduce( mod_bit, frecv, nlb, mpi_int_t, MPI_SUM, scp->comm );
#if ( PROFlevel>=2 )
t_reduce += SuperLU_timer_() - t_reduce_tmp;
#endif
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* local block number */
kcol = PCOL( k, grid );
if ( mycol == kcol ) { /* diagonal process */
nfrecvmod += frecv[lk];
if ( !frecv[lk] && !fmod[lk] ) ++nleaf;
}
}
}
#else /* old */
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* Local block number. */
kcol = PCOL( k, grid ); /* Root process in this row scope. */
if ( mycol != kcol && fmod[lk] )
i = 1; /* Contribution from non-diagonal process. */
else i = 0;
MPI_Reduce( &i, &frecv[lk], 1, mpi_int_t,
MPI_SUM, kcol, scp->comm );
if ( mycol == kcol ) { /* Diagonal process. */
nfrecvmod += frecv[lk];
if ( !frecv[lk] && !fmod[lk] ) ++nleaf;
#if ( DEBUGlevel>=2 )
printf("(%2d) frecv[%4d] %2d\n", iam, k, frecv[lk]);
assert( frecv[lk] < Pc );
#endif
}
}
}
#endif
}
/* ---------------------------------------------------------
Solve the leaf nodes first by all the diagonal processes.
--------------------------------------------------------- */
#if ( DEBUGlevel>=2 )
printf("(%2d) nleaf %4d\n", iam, nleaf);
#endif
for (k = 0; k < nsupers && nleaf; ++k) {
krow = PROW( k, grid );
kcol = PCOL( k, grid );
if ( myrow == krow && mycol == kcol ) { /* Diagonal process */
knsupc = SuperSize( k );
lk = LBi( k, grid );
if ( frecv[lk]==0 && fmod[lk]==0 ) {
fmod[lk] = -1; /* Do not solve X[k] in the future. */
ii = X_BLK( lk );
lk = LBj( k, grid ); /* Local block number, column-wise. */
lsub = Lrowind_bc_ptr[lk];
lusup = Lnzval_bc_ptr[lk];
nsupr = lsub[1];
#ifdef _CRAY
CTRSM(ftcs1, ftcs1, ftcs2, ftcs3, &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#elif defined (USE_VENDOR_BLAS)
ztrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc, 1, 1, 1, 1);
#else
ztrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#endif
stat->ops[SOLVE] += 4 * knsupc * (knsupc - 1) * nrhs
+ 10 * knsupc * nrhs; /* complex division */
--nleaf;
#if ( DEBUGlevel>=2 )
printf("(%2d) Solve X[%2d]\n", iam, k);
#endif
/*
* Send Xk to process column Pc[k].
*/
for (p = 0; p < Pr; ++p) {
if ( fsendx_plist[lk][p] != EMPTY ) {
pi = PNUM( p, kcol, grid );
MPI_Isend( &x[ii - XK_H], knsupc * nrhs + XK_H,
SuperLU_MPI_DOUBLE_COMPLEX, pi, Xk, grid->comm,
&send_req[Llu->SolveMsgSent++]);
#if 0
MPI_Send( &x[ii - XK_H], knsupc * nrhs + XK_H,
SuperLU_MPI_DOUBLE_COMPLEX, pi, Xk, grid->comm );
#endif
#if ( DEBUGlevel>=2 )
printf("(%2d) Sent X[%2.0f] to P %2d\n",
iam, x[ii-XK_H], pi);
#endif
}
}
/*
* Perform local block modifications: lsum[i] -= L_i,k * X[k]
*/
nb = lsub[0] - 1;
lptr = BC_HEADER + LB_DESCRIPTOR + knsupc;
luptr = knsupc; /* Skip diagonal block L(k,k). */
zlsum_fmod(lsum, x, &x[ii], rtemp, nrhs, knsupc, k,
fmod, nb, lptr, luptr, xsup, grid, Llu,
send_req, stat);
}
} /* if diagonal process ... */
} /* for k ... */
/* -----------------------------------------------------------
Compute the internal nodes asynchronously by all processes.
----------------------------------------------------------- */
#if ( DEBUGlevel>=2 )
printf("(%2d) nfrecvx %4d, nfrecvmod %4d, nleaf %4d\n",
iam, nfrecvx, nfrecvmod, nleaf);
#endif
while ( nfrecvx || nfrecvmod ) { /* While not finished. */
/* Receive a message. */
MPI_Recv( recvbuf, maxrecvsz, SuperLU_MPI_DOUBLE_COMPLEX,
MPI_ANY_SOURCE, MPI_ANY_TAG, grid->comm, &status );
k = (*recvbuf).r;
#if ( DEBUGlevel>=2 )
printf("(%2d) Recv'd block %d, tag %2d\n", iam, k, status.MPI_TAG);
#endif
switch ( status.MPI_TAG ) {
case Xk:
--nfrecvx;
lk = LBj( k, grid ); /* Local block number, column-wise. */
lsub = Lrowind_bc_ptr[lk];
lusup = Lnzval_bc_ptr[lk];
if ( lsub ) {
nb = lsub[0];
lptr = BC_HEADER;
luptr = 0;
knsupc = SuperSize( k );
/*
* Perform local block modifications: lsum[i] -= L_i,k * X[k]
*/
zlsum_fmod(lsum, x, &recvbuf[XK_H], rtemp, nrhs, knsupc, k,
fmod, nb, lptr, luptr, xsup, grid, Llu,
send_req, stat);
} /* if lsub */
break;
case LSUM: /* Receiver must be a diagonal process */
--nfrecvmod;
lk = LBi( k, grid ); /* Local block number, row-wise. */
ii = X_BLK( lk );
knsupc = SuperSize( k );
tempv = &recvbuf[LSUM_H];
RHS_ITERATE(j) {
for (i = 0; i < knsupc; ++i)
z_add(&x[i + ii + j*knsupc],
&x[i + ii + j*knsupc],
&tempv[i + j*knsupc]);
}
if ( (--frecv[lk])==0 && fmod[lk]==0 ) {
fmod[lk] = -1; /* Do not solve X[k] in the future. */
lk = LBj( k, grid ); /* Local block number, column-wise. */
lsub = Lrowind_bc_ptr[lk];
lusup = Lnzval_bc_ptr[lk];
nsupr = lsub[1];
#ifdef _CRAY
CTRSM(ftcs1, ftcs1, ftcs2, ftcs3, &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#elif defined (USE_VENDOR_BLAS)
ztrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc, 1, 1, 1, 1);
#else
ztrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#endif
stat->ops[SOLVE] += 4 * knsupc * (knsupc - 1) * nrhs
+ 10 * knsupc * nrhs; /* complex division */
#if ( DEBUGlevel>=2 )
printf("(%2d) Solve X[%2d]\n", iam, k);
#endif
/*
* Send Xk to process column Pc[k].
*/
kcol = PCOL( k, grid );
for (p = 0; p < Pr; ++p) {
if ( fsendx_plist[lk][p] != EMPTY ) {
pi = PNUM( p, kcol, grid );
MPI_Isend( &x[ii-XK_H], knsupc * nrhs + XK_H,
SuperLU_MPI_DOUBLE_COMPLEX, pi, Xk, grid->comm,
&send_req[Llu->SolveMsgSent++]);
#if 0
MPI_Send( &x[ii - XK_H], knsupc * nrhs + XK_H,
SuperLU_MPI_DOUBLE_COMPLEX, pi, Xk, grid->comm );
#endif
#if ( DEBUGlevel>=2 )
printf("(%2d) Sent X[%2.0f] to P %2d\n",
iam, x[ii-XK_H], pi);
#endif
}
}
/*
* Perform local block modifications.
*/
nb = lsub[0] - 1;
lptr = BC_HEADER + LB_DESCRIPTOR + knsupc;
luptr = knsupc; /* Skip diagonal block L(k,k). */
zlsum_fmod(lsum, x, &x[ii], rtemp, nrhs, knsupc, k,
fmod, nb, lptr, luptr, xsup, grid, Llu,
send_req, stat);
} /* if */
break;
#if ( DEBUGlevel>=2 )
default:
printf("(%2d) Recv'd wrong message tag %4d\n", status.MPI_TAG);
break;
#endif
} /* switch */
} /* while not finished ... */
#if ( PRNTlevel>=2 )
t = SuperLU_timer_() - t;
if ( !iam ) printf(".. L-solve time\t%8.2f\n", t);
t = SuperLU_timer_();
#endif
#if ( DEBUGlevel==2 )
{
printf("(%d) .. After L-solve: y =\n", iam);
for (i = 0, k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
kcol = PCOL( k, grid );
if ( myrow == krow && mycol == kcol ) { /* Diagonal process */
knsupc = SuperSize( k );
lk = LBi( k, grid );
ii = X_BLK( lk );
for (j = 0; j < knsupc; ++j)
printf("\t(%d)\t%4d\t%.10f\n", iam, xsup[k]+j, x[ii+j]);
fflush(stdout);
}
MPI_Barrier( grid->comm );
}
}
#endif
SUPERLU_FREE(fmod);
SUPERLU_FREE(frecv);
SUPERLU_FREE(rtemp);
/*for (i = 0; i < Llu->SolveMsgSent; ++i) MPI_Request_free(&send_req[i]);*/
for (i = 0; i < Llu->SolveMsgSent; ++i) MPI_Wait(&send_req[i], &status);
Llu->SolveMsgSent = 0;
MPI_Barrier( grid->comm );
/*---------------------------------------------------
* Back solve Ux = y.
*
* The Y components from the forward solve is already
* on the diagonal processes.
*---------------------------------------------------*/
/* Save the count to be altered so it can be used by
subsequent call to PZGSTRS. */
if ( !(bmod = intMalloc_dist(nlb)) )
ABORT("Calloc fails for bmod[].");
for (i = 0; i < nlb; ++i) bmod[i] = Llu->bmod[i];
if ( !(brecv = intMalloc_dist(nlb)) )
ABORT("Malloc fails for brecv[].");
Llu->brecv = brecv;
/*
* Compute brecv[] and nbrecvmod counts on the diagonal processes.
*/
{
superlu_scope_t *scp = &grid->rscp;
#if 1
for (k = 0; k < nlb; ++k) mod_bit[k] = 0;
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* local block number */
kcol = PCOL( k, grid ); /* root process in this row scope */
if ( mycol != kcol && bmod[lk] )
mod_bit[lk] = 1; /* Contribution from off-diagonal */
}
}
/* Every process receives the count, but it is only useful on the
diagonal processes. */
MPI_Allreduce( mod_bit, brecv, nlb, mpi_int_t, MPI_SUM, scp->comm );
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* local block number */
kcol = PCOL( k, grid ); /* root process in this row scope. */
if ( mycol == kcol ) { /* diagonal process */
nbrecvmod += brecv[lk];
if ( !brecv[lk] && !bmod[lk] ) ++nroot;
#if ( DEBUGlevel>=2 )
printf("(%2d) brecv[%4d] %2d\n", iam, k, brecv[lk]);
assert( brecv[lk] < Pc );
#endif
}
}
}
#else /* old */
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* Local block number. */
kcol = PCOL( k, grid ); /* Root process in this row scope. */
if ( mycol != kcol && bmod[lk] )
i = 1; /* Contribution from non-diagonal process. */
else i = 0;
MPI_Reduce( &i, &brecv[lk], 1, mpi_int_t,
MPI_SUM, kcol, scp->comm );
if ( mycol == kcol ) { /* Diagonal process. */
nbrecvmod += brecv[lk];
if ( !brecv[lk] && !bmod[lk] ) ++nroot;
#if ( DEBUGlevel>=2 )
printf("(%2d) brecv[%4d] %2d\n", iam, k, brecv[lk]);
assert( brecv[lk] < Pc );
#endif
}
}
}
#endif
}
/* Re-initialize lsum to zero. Each block header is already in place. */
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
knsupc = SuperSize( k );
lk = LBi( k, grid );
il = LSUM_BLK( lk );
dest = &lsum[il];
RHS_ITERATE(j) {
for (i = 0; i < knsupc; ++i) dest[i + j*knsupc] = zero;
}
}
}
void
pzgstrs_Bglobal(int_t n, LUstruct_t *LUstruct, gridinfo_t *grid,
doublecomplex *B, int_t ldb, int nrhs,
SuperLUStat_t *stat, int *info)
{
Glu_persist_t *Glu_persist = LUstruct->Glu_persist;
LocalLU_t *Llu = LUstruct->Llu;
doublecomplex alpha = {1.0, 0.0};
doublecomplex zero = {0.0, 0.0};
doublecomplex *lsum; /* Local running sum of the updates to B-components */
doublecomplex *x; /* X component at step k. */
doublecomplex *lusup, *dest;
doublecomplex *recvbuf, *tempv;
doublecomplex *rtemp; /* Result of full matrix-vector multiply. */
int_t **Ufstnz_br_ptr = Llu->Ufstnz_br_ptr;
int_t *Urbs, *Urbs1; /* Number of row blocks in each block column of U. */
Ucb_indptr_t **Ucb_indptr;/* Vertical linked list pointing to Uindex[] */
int_t **Ucb_valptr; /* Vertical linked list pointing to Unzval[] */
int_t kcol, krow, mycol, myrow;
int_t i, ii, il, j, jj, k, lb, ljb, lk, lptr, luptr;
int_t nb, nlb, nub, nsupers;
int_t *xsup, *lsub, *usub;
int_t *ilsum; /* Starting position of each supernode in lsum (LOCAL)*/
int Pc, Pr, iam;
int knsupc, nsupr;
int ldalsum; /* Number of lsum entries locally owned. */
int maxrecvsz, p, pi;
int_t **Lrowind_bc_ptr;
doublecomplex **Lnzval_bc_ptr;
MPI_Status status;
#if defined (ISEND_IRECV) || defined (BSEND)
MPI_Request *send_req, recv_req;
#endif
/*-- Counts used for L-solve --*/
int_t *fmod; /* Modification count for L-solve. */
int_t **fsendx_plist = Llu->fsendx_plist;
int_t nfrecvx = Llu->nfrecvx; /* Number of X components to be recv'd. */
int_t *frecv; /* Count of modifications to be recv'd from
processes in this row. */
int_t nfrecvmod = 0; /* Count of total modifications to be recv'd. */
int_t nleaf = 0, nroot = 0;
/*-- Counts used for U-solve --*/
int_t *bmod; /* Modification count for L-solve. */
int_t **bsendx_plist = Llu->bsendx_plist;
int_t nbrecvx = Llu->nbrecvx; /* Number of X components to be recv'd. */
int_t *brecv; /* Count of modifications to be recv'd from
processes in this row. */
int_t nbrecvmod = 0; /* Count of total modifications to be recv'd. */
double t;
#if ( DEBUGlevel>=2 )
int_t Ublocks = 0;
#endif
int_t *mod_bit = Llu->mod_bit; /* flag contribution from each row block */
t = SuperLU_timer_();
/* Test input parameters. */
*info = 0;
if ( n < 0 ) *info = -1;
else if ( nrhs < 0 ) *info = -9;
if ( *info ) {
pxerr_dist("PZGSTRS_BGLOBAL", grid, -*info);
return;
}
/*
* Initialization.
*/
iam = grid->iam;
Pc = grid->npcol;
Pr = grid->nprow;
myrow = MYROW( iam, grid );
mycol = MYCOL( iam, grid );
nsupers = Glu_persist->supno[n-1] + 1;
xsup = Glu_persist->xsup;
Lrowind_bc_ptr = Llu->Lrowind_bc_ptr;
Lnzval_bc_ptr = Llu->Lnzval_bc_ptr;
nlb = CEILING( nsupers, Pr ); /* Number of local block rows. */
stat->ops[SOLVE] = 0.0;
Llu->SolveMsgSent = 0;
#if ( DEBUGlevel>=1 )
CHECK_MALLOC(iam, "Enter pzgstrs_Bglobal()");
#endif
/* Save the count to be altered so it can be used by
subsequent call to PDGSTRS_BGLOBAL. */
if ( !(fmod = intMalloc_dist(nlb)) )
ABORT("Calloc fails for fmod[].");
for (i = 0; i < nlb; ++i) fmod[i] = Llu->fmod[i];
if ( !(frecv = intMalloc_dist(nlb)) )
ABORT("Malloc fails for frecv[].");
Llu->frecv = frecv;
#if defined (ISEND_IRECV) || defined (BSEND)
k = SUPERLU_MAX( Llu->nfsendx, Llu->nbsendx ) + nlb;
if ( !(send_req = (MPI_Request*) SUPERLU_MALLOC(k*sizeof(MPI_Request))) )
ABORT("Malloc fails for send_req[].");
#endif
#ifdef _CRAY
ftcs1 = _cptofcd("L", strlen("L"));
ftcs2 = _cptofcd("N", strlen("N"));
ftcs3 = _cptofcd("U", strlen("U"));
#endif
/* Obtain ilsum[] and ldalsum for process column 0. */
ilsum = Llu->ilsum;
ldalsum = Llu->ldalsum;
/* Allocate working storage. */
knsupc = sp_ienv_dist(3);
maxrecvsz = knsupc * nrhs + SUPERLU_MAX( XK_H, LSUM_H );
if ( !(lsum = doublecomplexCalloc_dist(((size_t)ldalsum) * nrhs
+ nlb * LSUM_H)) )
ABORT("Calloc fails for lsum[].");
if ( !(x = doublecomplexMalloc_dist(((size_t)ldalsum) * nrhs
+ nlb * XK_H)) )
ABORT("Malloc fails for x[].");
if ( !(recvbuf = doublecomplexMalloc_dist(maxrecvsz)) )
ABORT("Malloc fails for recvbuf[].");
if ( !(rtemp = doublecomplexCalloc_dist(maxrecvsz)) )
ABORT("Malloc fails for rtemp[].");
/*---------------------------------------------------
* Forward solve Ly = b.
*---------------------------------------------------*/
/*
* Copy B into X on the diagonal processes.
*/
ii = 0;
for (k = 0; k < nsupers; ++k) {
knsupc = SuperSize( k );
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* Local block number. */
il = LSUM_BLK( lk );
lsum[il - LSUM_H].r = k;/* Block number prepended in the header. */
lsum[il - LSUM_H].i = 0;
kcol = PCOL( k, grid );
if ( mycol == kcol ) { /* Diagonal process. */
jj = X_BLK( lk );
x[jj - XK_H].r = k; /* Block number prepended in the header. */
x[jj - XK_H].i = 0;
RHS_ITERATE(j)
for (i = 0; i < knsupc; ++i) /* X is stored in blocks. */
x[i + jj + j*knsupc] = B[i + ii + j*ldb];
}
}
void pdgstrs1(int_t n, LUstruct_t *LUstruct, gridinfo_t *grid,
double *x, int nrhs, SuperLUStat_t *stat, int *info)
{
/*
* Purpose
* =======
*
* PDGSTRS1 solves a system of distributed linear equations
*
* op( sub(A) ) * X = sub( B )
*
* with a general N-by-N distributed matrix sub( A ) using the LU
* factorization computed by PDGSTRF.
*
* Arguments
* =========
*
* n (input) int (global)
* The order of the system of linear equations.
*
* LUstruct (input) LUstruct_t*
* The distributed data structures to store L and U factors,
* and the permutation vectors.
* See superlu_ddefs.h for the definition of 'LUstruct_t' structure.
*
* grid (input) gridinfo_t*
* The 2D process mesh.
*
* x (input/output) double*
* On entry, the right hand side matrix.
* On exit, the solution matrix if info = 0;
*
* NOTE: the right-hand side matrix is already distributed on
* the diagonal processes.
*
* nrhs (input) int (global)
* Number of right-hand sides.
*
* stat (output) SuperLUStat_t*
* Record the statistics about the triangular solves;
* See SuperLUStat_t structure defined in util.h.
*
* info (output) int*
* = 0: successful exit
* < 0: if info = -i, the i-th argument had an illegal value
*
*/
Glu_persist_t *Glu_persist = LUstruct->Glu_persist;
LocalLU_t *Llu = LUstruct->Llu;
double alpha = 1.0;
double *lsum; /* Local running sum of the updates to B-components */
double *lusup, *dest;
double *recvbuf, *tempv;
double *rtemp; /* Result of full matrix-vector multiply. */
int_t **Ufstnz_br_ptr = Llu->Ufstnz_br_ptr;
int_t *Urbs, *Urbs1; /* Number of row blocks in each block column of U. */
Ucb_indptr_t **Ucb_indptr;/* Vertical linked list pointing to Uindex[] */
int_t **Ucb_valptr; /* Vertical linked list pointing to Unzval[] */
int_t iam, kcol, krow, mycol, myrow;
int_t i, ii, il, j, k, lb, ljb, lk, lptr, luptr;
int_t nb, nlb, nub, nsupers;
int_t *xsup, *lsub, *usub;
int_t *ilsum; /* Starting position of each supernode in lsum (LOCAL)*/
int_t Pc, Pr;
int knsupc, nsupr;
int ldalsum; /* Number of lsum entries locally owned. */
int maxrecvsz, p, pi;
int_t **Lrowind_bc_ptr;
double **Lnzval_bc_ptr;
MPI_Status status;
#ifdef ISEND_IRECV
MPI_Request *send_req, recv_req;
#endif
/*-- Counts used for L-solve --*/
int_t *fmod; /* Modification count for L-solve. */
int_t **fsendx_plist = Llu->fsendx_plist;
int_t nfrecvx = Llu->nfrecvx; /* Number of X components to be recv'd. */
int_t *frecv; /* Count of modifications to be recv'd from
processes in this row. */
int_t nfrecvmod = 0; /* Count of total modifications to be recv'd. */
int_t nleaf = 0, nroot = 0;
/*-- Counts used for U-solve --*/
int_t *bmod; /* Modification count for L-solve. */
int_t **bsendx_plist = Llu->bsendx_plist;
int_t nbrecvx = Llu->nbrecvx; /* Number of X components to be recv'd. */
int_t *brecv; /* Count of modifications to be recv'd from
processes in this row. */
int_t nbrecvmod = 0; /* Count of total modifications to be recv'd. */
double t;
#if ( DEBUGlevel>=2 )
int_t Ublocks = 0;
#endif
t = SuperLU_timer_();
/* Test input parameters. */
*info = 0;
if ( n < 0 ) *info = -1;
else if ( nrhs < 0 ) *info = -8;
if ( *info ) {
pxerbla("PDGSTRS1", grid, -*info);
return;
}
/*
* Initialization.
*/
iam = grid->iam;
Pc = grid->npcol;
Pr = grid->nprow;
myrow = MYROW( iam, grid );
mycol = MYCOL( iam, grid );
nsupers = Glu_persist->supno[n-1] + 1;
xsup = Glu_persist->xsup;
Lrowind_bc_ptr = Llu->Lrowind_bc_ptr;
Lnzval_bc_ptr = Llu->Lnzval_bc_ptr;
nlb = CEILING( nsupers, Pr ); /* Number of local block rows. */
Llu->SolveMsgSent = 0;
#if ( DEBUGlevel>=1 )
CHECK_MALLOC(iam, "Enter pdgstrs1()");
#endif
/* Save the count to be altered so it can be used by
subsequent call to PDGSTRS1. */
if ( !(fmod = intMalloc_dist(nlb)) )
ABORT("Calloc fails for fmod[].");
for (i = 0; i < nlb; ++i) fmod[i] = Llu->fmod[i];
if ( !(frecv = intMalloc_dist(nlb)) )
ABORT("Malloc fails for frecv[].");
Llu->frecv = frecv;
#ifdef ISEND_IRECV
k = SUPERLU_MAX( Llu->nfsendx, Llu->nbsendx ) + nlb;
if ( !(send_req = (MPI_Request*) SUPERLU_MALLOC(k*sizeof(MPI_Request))) )
ABORT("Malloc fails for send_req[].");
#endif
#ifdef _CRAY
ftcs1 = _cptofcd("L", strlen("L"));
ftcs2 = _cptofcd("N", strlen("N"));
ftcs3 = _cptofcd("U", strlen("U"));
#endif
/* Compute ilsum[] and ldalsum for process column 0. */
ilsum = Llu->ilsum;
ldalsum = Llu->ldalsum;
/* Allocate working storage. */
knsupc = sp_ienv_dist(3);
if ( !(lsum = doubleCalloc_dist(((size_t)ldalsum) * nrhs
+ nlb * LSUM_H)) )
ABORT("Calloc fails for lsum[].");
maxrecvsz = knsupc * nrhs + SUPERLU_MAX(XK_H, LSUM_H);
if ( !(recvbuf = doubleMalloc_dist(maxrecvsz)) )
ABORT("Malloc fails for recvbuf[].");
if ( !(rtemp = doubleCalloc_dist(maxrecvsz)) )
ABORT("Malloc fails for rtemp[].");
/*---------------------------------------------------
* Forward solve Ly = b.
*---------------------------------------------------*/
/*
* Prepended the block number in the header for lsum[].
*/
for (k = 0; k < nsupers; ++k) {
knsupc = SuperSize( k );
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* Local block number. */
il = LSUM_BLK( lk );
lsum[il - LSUM_H] = k;
}
}
/*
* Compute frecv[] and nfrecvmod counts on the diagonal processes.
*/
{
superlu_scope_t *scp = &grid->rscp;
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* Local block number. */
kcol = PCOL( k, grid ); /* Root process in this row scope. */
if ( mycol != kcol && fmod[lk] )
i = 1; /* Contribution from non-diagonal process. */
else i = 0;
MPI_Reduce( &i, &frecv[lk], 1, mpi_int_t,
MPI_SUM, kcol, scp->comm );
if ( mycol == kcol ) { /* Diagonal process. */
nfrecvmod += frecv[lk];
if ( !frecv[lk] && !fmod[lk] ) ++nleaf;
#if ( DEBUGlevel>=2 )
printf("(%2d) frecv[%4d] %2d\n", iam, k, frecv[lk]);
assert( frecv[lk] < Pc );
#endif
}
}
}
}
/* ---------------------------------------------------------
Solve the leaf nodes first by all the diagonal processes.
--------------------------------------------------------- */
#if ( DEBUGlevel>=2 )
printf("(%2d) nleaf %4d\n", iam, nleaf);
#endif
for (k = 0; k < nsupers && nleaf; ++k) {
krow = PROW( k, grid );
kcol = PCOL( k, grid );
if ( myrow == krow && mycol == kcol ) { /* Diagonal process */
knsupc = SuperSize( k );
lk = LBi( k, grid );
if ( !frecv[lk] && !fmod[lk] ) {
fmod[lk] = -1; /* Do not solve X[k] in the future. */
ii = X_BLK( lk );
lk = LBj( k, grid ); /* Local block number, column-wise. */
lsub = Lrowind_bc_ptr[lk];
lusup = Lnzval_bc_ptr[lk];
nsupr = lsub[1];
#ifdef _CRAY
STRSM(ftcs1, ftcs1, ftcs2, ftcs3, &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#elif defined (USE_VENDOR_BLAS)
dtrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc, 1, 1, 1, 1);
#else
dtrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#endif
/*stat->ops[SOLVE] += knsupc * (knsupc - 1) * nrhs;*/
--nleaf;
#if ( DEBUGlevel>=2 )
printf("(%2d) Solve X[%2d]\n", iam, k);
#endif
/*
* Send Xk to process column Pc[k].
*/
for (p = 0; p < Pr; ++p)
if ( fsendx_plist[lk][p] != EMPTY ) {
pi = PNUM( p, kcol, grid );
#ifdef ISEND_IRECV
MPI_Isend( &x[ii - XK_H], knsupc * nrhs + XK_H,
MPI_DOUBLE, pi, Xk, grid->comm,
&send_req[Llu->SolveMsgSent++]);
#else
MPI_Send( &x[ii - XK_H], knsupc * nrhs + XK_H,
MPI_DOUBLE,
pi, Xk, grid->comm );
#endif
#if ( DEBUGlevel>=2 )
printf("(%2d) Sent X[%2.0f] to P %2d\n",
iam, x[ii-XK_H], pi);
#endif
}
/*
* Perform local block modifications: lsum[i] -= L_i,k * X[k]
*/
nb = lsub[0] - 1;
lptr = BC_HEADER + LB_DESCRIPTOR + knsupc;
luptr = knsupc; /* Skip diagonal block L(k,k). */
dlsum_fmod(lsum, x, &x[ii], rtemp, nrhs, knsupc, k,
fmod, nb, lptr, luptr, xsup, grid, Llu,
send_req, stat);
}
} /* if diagonal process ... */
} /* for k ... */
/*
* Compute the internal nodes asynchronously by all processes.
*/
#if ( DEBUGlevel>=2 )
printf("(%2d) nfrecvx %4d, nfrecvmod %4d, nleaf %4d\n",
iam, nfrecvx, nfrecvmod, nleaf);
#endif
while ( nfrecvx || nfrecvmod ) { /* While not finished. */
/* Receive a message. */
#ifdef ISEND_IRECV
/* -MPI- FATAL: Remote protocol queue full */
MPI_Irecv( recvbuf, maxrecvsz, MPI_DOUBLE, MPI_ANY_SOURCE,
MPI_ANY_TAG, grid->comm, &recv_req );
MPI_Wait( &recv_req, &status );
#else
MPI_Recv( recvbuf, maxrecvsz, MPI_DOUBLE, MPI_ANY_SOURCE,
MPI_ANY_TAG, grid->comm, &status );
#endif
k = *recvbuf;
#if ( DEBUGlevel>=2 )
printf("(%2d) Recv'd block %d, tag %2d\n", iam, k, status.MPI_TAG);
#endif
switch ( status.MPI_TAG ) {
case Xk:
--nfrecvx;
lk = LBj( k, grid ); /* Local block number, column-wise. */
lsub = Lrowind_bc_ptr[lk];
lusup = Lnzval_bc_ptr[lk];
if ( lsub ) {
nb = lsub[0];
lptr = BC_HEADER;
luptr = 0;
knsupc = SuperSize( k );
/*
* Perform local block modifications: lsum[i] -= L_i,k * X[k]
*/
dlsum_fmod(lsum, x, &recvbuf[XK_H], rtemp, nrhs, knsupc, k,
fmod, nb, lptr, luptr, xsup, grid, Llu,
send_req, stat);
} /* if lsub */
break;
case LSUM:
--nfrecvmod;
lk = LBi( k, grid ); /* Local block number, row-wise. */
ii = X_BLK( lk );
knsupc = SuperSize( k );
tempv = &recvbuf[LSUM_H];
RHS_ITERATE(j)
for (i = 0; i < knsupc; ++i)
x[i + ii + j*knsupc] += tempv[i + j*knsupc];
if ( (--frecv[lk])==0 && fmod[lk]==0 ) {
fmod[lk] = -1; /* Do not solve X[k] in the future. */
lk = LBj( k, grid ); /* Local block number, column-wise. */
lsub = Lrowind_bc_ptr[lk];
lusup = Lnzval_bc_ptr[lk];
nsupr = lsub[1];
#ifdef _CRAY
STRSM(ftcs1, ftcs1, ftcs2, ftcs3, &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#elif defined (USE_VENDOR_BLAS)
dtrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc, 1, 1, 1, 1);
#else
dtrsm_("L", "L", "N", "U", &knsupc, &nrhs, &alpha,
lusup, &nsupr, &x[ii], &knsupc);
#endif
/*stat->ops[SOLVE] += knsupc * (knsupc - 1) * nrhs;*/
#if ( DEBUGlevel>=2 )
printf("(%2d) Solve X[%2d]\n", iam, k);
#endif
/*
* Send Xk to process column Pc[k].
*/
kcol = PCOL( k, grid );
for (p = 0; p < Pr; ++p)
if ( fsendx_plist[lk][p] != EMPTY ) {
pi = PNUM( p, kcol, grid );
#ifdef ISEND_IRECV
MPI_Isend( &x[ii - XK_H], knsupc * nrhs + XK_H,
MPI_DOUBLE, pi, Xk, grid->comm,
&send_req[Llu->SolveMsgSent++] );
#else
MPI_Send( &x[ii - XK_H], knsupc * nrhs + XK_H,
MPI_DOUBLE, pi, Xk, grid->comm );
#endif
#if ( DEBUGlevel>=2 )
printf("(%2d) Sent X[%2.0f] to P %2d\n",
iam, x[ii-XK_H], pi);
#endif
}
/*
* Perform local block modifications.
*/
nb = lsub[0] - 1;
lptr = BC_HEADER + LB_DESCRIPTOR + knsupc;
luptr = knsupc; /* Skip diagonal block L(k,k). */
dlsum_fmod(lsum, x, &x[ii], rtemp, nrhs, knsupc, k,
fmod, nb, lptr, luptr, xsup, grid, Llu,
send_req, stat);
} /* if */
break;
#if ( DEBUGlevel>=2 )
default:
printf("(%2d) Recv'd wrong message tag %4d\n", status.MPI_TAG);
break;
#endif
} /* switch */
} /* while not finished ... */
#if ( PRNTlevel>=2 )
t = SuperLU_timer_() - t;
if ( !iam ) printf(".. L-solve time\t%8.2f\n", t);
t = SuperLU_timer_();
#endif
#if ( DEBUGlevel>=2 )
if ( !iam ) printf("\n.. After L-solve: y =\n");
for (i = 0, k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
kcol = PCOL( k, grid );
if ( myrow == krow && mycol == kcol ) { /* Diagonal process */
knsupc = SuperSize( k );
lk = LBi( k, grid );
ii = X_BLK( lk );
for (j = 0; j < knsupc; ++j)
printf("\t(%d)\t%4d\t%.10f\n", iam, xsup[k]+j, x[ii+j]);
}
MPI_Barrier( grid->comm );
}
#endif
SUPERLU_FREE(fmod);
SUPERLU_FREE(frecv);
SUPERLU_FREE(rtemp);
#ifdef ISEND_IRECV
for (i = 0; i < Llu->SolveMsgSent; ++i) MPI_Request_free(&send_req[i]);
Llu->SolveMsgSent = 0;
#endif
/*---------------------------------------------------
* Back solve Ux = y.
*
* The Y components from the forward solve is already
* on the diagonal processes.
*---------------------------------------------------*/
/* Save the count to be altered so it can be used by
subsequent call to PDGSTRS1. */
if ( !(bmod = intMalloc_dist(nlb)) )
ABORT("Calloc fails for bmod[].");
for (i = 0; i < nlb; ++i) bmod[i] = Llu->bmod[i];
if ( !(brecv = intMalloc_dist(nlb)) )
ABORT("Malloc fails for brecv[].");
Llu->brecv = brecv;
/*
* Compute brecv[] and nbrecvmod counts on the diagonal processes.
*/
{
superlu_scope_t *scp = &grid->rscp;
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
lk = LBi( k, grid ); /* Local block number. */
kcol = PCOL( k, grid ); /* Root process in this row scope. */
if ( mycol != kcol && bmod[lk] )
i = 1; /* Contribution from non-diagonal process. */
else i = 0;
MPI_Reduce( &i, &brecv[lk], 1, mpi_int_t,
MPI_SUM, kcol, scp->comm );
if ( mycol == kcol ) { /* Diagonal process. */
nbrecvmod += brecv[lk];
if ( !brecv[lk] && !bmod[lk] ) ++nroot;
#if ( DEBUGlevel>=2 )
printf("(%2d) brecv[%4d] %2d\n", iam, k, brecv[lk]);
assert( brecv[lk] < Pc );
#endif
}
}
}
}
/* Re-initialize lsum to zero. Each block header is already in place. */
for (k = 0; k < nsupers; ++k) {
krow = PROW( k, grid );
if ( myrow == krow ) {
knsupc = SuperSize( k );
lk = LBi( k, grid );
il = LSUM_BLK( lk );
dest = &lsum[il];
RHS_ITERATE(j)
for (i = 0; i < knsupc; ++i) dest[i + j*knsupc] = 0.0;
}
}
