/**
Purpose
-------
Solves a system of linear equations
A * X = B
where A is a general N-by-N matrix and X and B are N-by-NRHS matrices.
The LU decomposition with partial pivoting and row interchanges is
used to factor A as
A = P * L * U,
where P is a permutation matrix, L is unit lower triangular, and U is
upper triangular. The factored form of A is then used to solve the
system of equations A * X = B.
Arguments
---------
@param[in]
n INTEGER
The order of the matrix A. N >= 0.
@param[in]
nrhs INTEGER
The number of right hand sides, i.e., the number of columns
of the matrix B. NRHS >= 0.
@param[in,out]
dA DOUBLE_PRECISION array on the GPU, dimension (LDDA,N).
On entry, the M-by-N matrix to be factored.
On exit, the factors L and U from the factorization
A = P*L*U; the unit diagonal elements of L are not stored.
@param[in]
ldda INTEGER
The leading dimension of the array A. LDA >= max(1,N).
@param[out]
ipiv INTEGER array, dimension (min(M,N))
The pivot indices; for 1 <= i <= min(M,N), row i of the
matrix was interchanged with row IPIV(i).
@param[in,out]
dB DOUBLE_PRECISION array on the GPU, dimension (LDB,NRHS)
On entry, the right hand side matrix B.
On exit, the solution matrix X.
@param[in]
lddb INTEGER
The leading dimension of the array B. LDB >= max(1,N).
@param[out]
info INTEGER
- = 0: successful exit
- < 0: if INFO = -i, the i-th argument had an illegal value
@ingroup magma_dgesv_driver
********************************************************************/
extern "C" magma_int_t
magma_dgesv_nopiv_batched(
magma_int_t n, magma_int_t nrhs,
double **dA_array, magma_int_t ldda,
double **dB_array, magma_int_t lddb,
magma_int_t *info_array,
magma_int_t batchCount)
{
/* Local variables */
magma_int_t info;
info = 0;
if (n < 0) {
info = -1;
} else if (nrhs < 0) {
info = -2;
} else if (ldda < max(1,n)) {
info = -4;
} else if (lddb < max(1,n)) {
info = -6;
}
if (info != 0) {
magma_xerbla( __func__, -(info) );
return info;
}
/* Quick return if possible */
if (n == 0 || nrhs == 0) {
return info;
}
info = magma_dgetrf_nopiv_batched( n, n, dA_array, ldda, info_array, batchCount);
if ( (info != MAGMA_SUCCESS) ){
return info;
}
#ifdef CHECK_INFO
// check correctness of results throught "dinfo_magma" and correctness of argument throught "info"
magma_int_t *cpu_info = (magma_int_t*) malloc(batchCount*sizeof(magma_int_t));
magma_getvector( batchCount, sizeof(magma_int_t), dinfo_array, 1, cpu_info, 1);
for(int i=0; i<batchCount; i++)
{
if(cpu_info[i] != 0 ){
printf("magma_dgetrf_batched matrix %d returned error %d\n",i, (int)cpu_info[i] );
info = cpu_info[i];
free (cpu_info);
return info;
}
}
free (cpu_info);
#endif
info = magma_dgetrs_nopiv_batched( MagmaNoTrans, n, nrhs, dA_array, ldda, dB_array, lddb, info_array, batchCount );
return info;
}
extern "C" magma_int_t
magma_dgesv_rbt_batched(
magma_int_t n, magma_int_t nrhs,
double **dA_array, magma_int_t ldda,
double **dB_array, magma_int_t lddb,
magma_int_t *dinfo_array,
magma_int_t batchCount, magma_queue_t queue)
{
/* Local variables */
magma_int_t i, info;
info = 0;
if (n < 0) {
info = -1;
} else if (nrhs < 0) {
info = -2;
} else if (ldda < max(1,n)) {
info = -4;
} else if (lddb < max(1,n)) {
info = -6;
}
if (info != 0) {
magma_xerbla( __func__, -(info) );
return info;
}
/* Quick return if possible */
if (n == 0 || nrhs == 0) {
return info;
}
double *hu, *hv;
if (MAGMA_SUCCESS != magma_dmalloc_cpu( &hu, 2*n )) {
info = MAGMA_ERR_HOST_ALLOC;
return info;
}
if (MAGMA_SUCCESS != magma_dmalloc_cpu( &hv, 2*n )) {
info = MAGMA_ERR_HOST_ALLOC;
return info;
}
info = magma_dgerbt_batched(MagmaTrue, n, nrhs, dA_array, n, dB_array, n, hu, hv, &info, batchCount, queue);
if (info != MAGMA_SUCCESS) {
return info;
}
info = magma_dgetrf_nopiv_batched( n, n, dA_array, ldda, dinfo_array, batchCount, queue);
if ( info != MAGMA_SUCCESS ) {
return info;
}
#ifdef CHECK_INFO
// check correctness of results throught "dinfo_magma" and correctness of argument throught "info"
magma_int_t *cpu_info = NULL;
magma_imalloc_cpu( &cpu_info, batchCount );
magma_getvector( batchCount, sizeof(magma_int_t), dinfo_array, 1, cpu_info, 1);
for (i=0; i < batchCount; i++)
{
if (cpu_info[i] != 0 ) {
printf("magma_dgetrf_batched matrix %d returned error %d\n",i, (int)cpu_info[i] );
info = cpu_info[i];
magma_free_cpu (cpu_info);
return info;
}
}
magma_free_cpu (cpu_info);
#endif
info = magma_dgetrs_nopiv_batched( MagmaNoTrans, n, nrhs, dA_array, ldda, dB_array, lddb, dinfo_array, batchCount, queue );
/* The solution of A.x = b is Vy computed on the GPU */
double *dv;
if (MAGMA_SUCCESS != magma_dmalloc( &dv, 2*n )) {
info = MAGMA_ERR_DEVICE_ALLOC;
return info;
}
magma_dsetvector( 2*n, hv, 1, dv, 1, queue );
for (i = 0; i < nrhs; i++)
magmablas_dprbt_mv_batched(n, dv, dB_array+(i), batchCount, queue);
// magma_dgetmatrix( n, nrhs, db, nn, B, ldb, queue );
return info;
}