MKL_INT PardisoSolver::FactorMatrix(const SparseMatrix * A)
{
if (directIterative)
return 0;
mkl_set_num_threads(numThreads);
// compute the factorization
if (verbose >= 1)
printf("Factoring the %d x %d matrix (%d threads)...\n", n, n, numThreads);
int upperTriangleOnly = 1;
int oneIndexed = 1;
if ((mtype == REAL_SPD) || (mtype == REAL_SYM_INDEFINITE)) // matrix is symmetric
upperTriangleOnly = 1; // symmetric matrix can only be represented by its upper triangle elements
else // structural symmetric or unsymmetric
upperTriangleOnly = 0; // unsymmetric matrix must store all its elements
A->GenerateCompressedRowMajorFormat(a, NULL, NULL, upperTriangleOnly, oneIndexed);
// factor
phase = 22;
PARDISO(pt, &maxfct, &mnum, (MKL_INT*)&mtype, &phase, &n, a, ia, ja, NULL, &nrhs, iparm, &msglvl, NULL, NULL, &error);
if (error != 0)
printf("Error: Pardiso Cholesky decomposition returned non-zero exit code %d.\n", error);
if (verbose >= 1)
printf("Factorization completed.\n");
return error;
}
MKL_INT PardisoSolver::SolveLinearSystemDirectIterative(const SparseMatrix * A, double * x, const double * rhs)
{
if (directIterative != 1)
{
printf("Error: direct-iterative flag was not specified in the constructor.\n");
return 102;
}
mkl_set_num_threads(numThreads);
if (verbose >= 2)
printf("Solving linear system...(%d threads, direct-iterative)\n", numThreads);
int upperTriangleOnly = 1;
int oneIndexed = 1;
A->GenerateCompressedRowMajorFormat(a, NULL, NULL, upperTriangleOnly, oneIndexed);
phase = 23;
PARDISO(pt, &maxfct, &mnum, (MKL_INT*)&mtype, &phase, &n, a, ia, ja, NULL, &nrhs, iparm, &msglvl, (double*)rhs, x, &error);
if (error != 0)
printf("Error: Pardiso solve returned non-zero exit code %d.\n", error);
if (verbose >= 2)
printf("Solve completed.\n");
return error;
}
MKL_INT PardisoSolver::BackwardSubstitution(double * x, const double * y)
{
if (directIterative != 0)
{
printf("Error: direct-iterative flag was specified in the constructor (must use SolveLinearSystemDirectIterative routine).\n");
return 101;
}
mkl_set_num_threads(numThreads);
if (verbose >= 2)
printf("Performing forward substitution...(%d threads)\n", numThreads);
int maxIterRefinementSteps = iparm[7];
iparm[7] = 0;
phase = 333;
PARDISO(pt, &maxfct, &mnum, (MKL_INT*)&mtype, &phase, &n, a, ia, ja, NULL, &nrhs, iparm, &msglvl, (double*)y, x, &error);
iparm[7] = maxIterRefinementSteps;
if (error != 0)
printf("Error: Pardiso solve returned non-zero exit code %d.\n", error);
if (verbose >= 2)
printf("Solve completed.\n");
return error;
}
MKL_INT PardisoSolver::ComputeCholeskyDecomposition(const SparseMatrix * A)
{
if (directIterative)
return 0;
// compute the factorization
if (verbose >= 1)
printf("Factoring the %d x %d matrix (%d threads)...\n",n,n, numThreads);
int upperTriangleOnly = 1;
int oneIndexed = 1;
A->GenerateCompressedRowMajorFormat(a, NULL, NULL, upperTriangleOnly, oneIndexed);
// factor
phase = 22;
PARDISO(pt, &maxfct, &mnum, &mtype, &phase, &n, a, ia, ja, NULL, &nrhs, iparm, &msglvl, NULL, NULL, &error);
if (error != 0)
printf("Error: Pardiso Cholesky decomposition returned non-zero exit code %d.\n", error);
if (verbose >= 1)
printf("Factorization completed.\n");
return error;
}
MKL_INT PardisoSolver::DiagonalSubstitution(double * v, const double * y)
{
if (directIterative != 0)
{
printf("Error: direct-iterative flag was specified in the constructor (must use SolveLinearSystemDirectIterative routine).\n");
return 101;
}
if (positiveDefinite == 1)
{
printf("Error: diagonal substitution should not be used for positive-definite matrices.\n");
return 102;
}
if (verbose >= 2)
printf("Performing forward substitution...(%d threads, using previously computed LU)\n", numThreads);
int maxIterRefinementSteps = iparm[7];
iparm[7] = 0;
phase = 332;
PARDISO(pt, &maxfct, &mnum, &mtype, &phase, &n, a, ia, ja, NULL, &nrhs, iparm, &msglvl, (double*)y, v, &error);
iparm[7] = maxIterRefinementSteps;
if (error != 0)
printf("Error: Pardiso solve returned non-zero exit code %d.\n", error);
if (verbose >= 2)
printf("Solve completed.\n");
return error;
}
PardisoSolver::~PardisoSolver()
{
phase = -1;
PARDISO(pt, &maxfct, &mnum, (MKL_INT*)&mtype, &phase, &n, a, ia, ja, NULL, &nrhs, iparm, &msglvl, NULL, NULL, &error);
if (error != 0)
printf("Error: Pardiso Cholesky dealloacation returned non-zero exit code %d.\n", error);
free(a);
free(ia);
free(ja);
}
int PardisoSolver::SolveLinearSystem(double * x, const double * rhs)
{
if (directIterative != 0)
{
printf("Error: direct-iterative flag was specified in the constructor (must use SolveLinearSystemDirectIterative routine).\n");
return 101;
}
if (verbose >= 2)
printf("Solving linear system...(%d threads, using previously computed LU)\n", numThreads);
phase = 33;
PARDISO(pt, &maxfct, &mnum, &mtype, &phase, &n, a, ia, ja, NULL, &nrhs, iparm, &msglvl, (double*)rhs, x, &error);
if (error != 0)
printf("Error: Pardiso solve returned non-zero exit code %d.\n", error);
if (verbose >= 2)
printf("Solve completed.\n");
return (int)error;
}
MKL_INT PardisoSolver::SolveLinearSystemMultipleRHS(double * x, const double * rhs, int numRHS)
{
if (directIterative != 0)
{
printf("Error: direct-iterative flag was specified in the constructor (must use SolveLinearSystemDirectIterative routine).\n");
return 101;
}
if (verbose >= 2)
printf("Solving linear system...(%d threads)\n", numThreads);
mkl_set_num_threads(numThreads);
phase = 33;
PARDISO(pt, &maxfct, &mnum, (MKL_INT*)&mtype, &phase, &n, a, ia, ja, NULL, &numRHS, iparm, &msglvl, (double*)rhs, x, &error);
if (error != 0)
printf("Error: Pardiso solve returned non-zero exit code %d.\n", error);
if (verbose >= 2)
printf("Solve completed.\n");
return error;
}
int LinearSparseSolver( static_sparse_CSR_Matrix<double, std::int32_t, M_PROP::SYM>& A,
Matrix<double, M_PROP::GE, M_SHAPE::RE, M_ORD::COL>& B,
Matrix<double, M_PROP::GE, M_SHAPE::RE, M_ORD::COL>& X,
std::ostream& log,
int threads)
{
typedef MML3_INT_TYPE int_t;
int len=100;
char buf[100];
//MKLGetVersionString(buf, len);
mkl_get_version_string(buf, len);
log << "Solutore lineare per matrici sparse basato su:\n"
<< "\tMKL-PARDISO: " << std::string(buf,len);
log << "\nCaratteristiche del sistema:"
<< "\n\t N =" << A.nrows()
<< "\n\t NNZ =" << A.nonzeros()
<< "\n\t NRHS=" << B.ncols() << std::endl;
// pardiso parameters
MML3::Vector<int_t> pardiso_pt(64);
pardiso_pt=0;
int_t pardiso_maxfct = 1; // una sola matrice da fattorizzare
int_t pardiso_mnum = 1; // la matrice numero 1
int_t pardiso_mtype = 2; // matrici simmetriche definite positive
int_t pardiso_phase = 0;
int_t pardiso_n = A.nrows();
double* pardiso_a=A.column_value();
int_t* pardiso_ia = A.row_pos();
int_t* pardiso_ja = A.column_index();
MML3::Vector<int_t> pardiso_perm(pardiso_n);
int_t pardiso_nrhs = 0;
MML3::Vector<int_t> pardiso_iparam(64);
pardiso_iparam = 0;
int_t pardiso_msglvl = 0; // 1=messaggi a run time, 0=no messaggi
double* pardiso_b=0;
double* pardiso_x=0;
int_t pardiso_error=0;
pardiso_iparam(1) = 1; /* No solver default*/
pardiso_iparam(2) = 2; /* Fill-in reordering from METIS, 1 for AMD */
pardiso_iparam(3) = threads; /* Numbers of thread processors */
pardiso_iparam(4) = 0; /* No iterative-direct algorithm */
pardiso_iparam(5) = 0; /* No user fill-in reducing permutation */
pardiso_iparam(6) = 0; /* Write solution into x */
pardiso_iparam(7) = 16; /* Default logical fortran unit number for output */
pardiso_iparam(8) = 0; /* Max numbers of iterative refinement steps */
pardiso_iparam(9) = 0; /* Not in use*/
pardiso_iparam(10) = 13; /* Perturb the pivot elements with 1E-13 */
pardiso_iparam(11) = 0; /* Use nonsymmetric permutation and scaling MPS */
pardiso_iparam(12) = 0; /* Not in use*/
pardiso_iparam(13) = 0; /* Not in use*/
pardiso_iparam(14) = 0; /* Output: Number of perturbed pivots */
pardiso_iparam(15) = 0; /* Not in use*/
pardiso_iparam(16) = 0; /* Not in use*/
pardiso_iparam(17) = 0; /* Not in use*/
pardiso_iparam(18) = -1; /* Output: Number of nonzeros in the factor LU */
pardiso_iparam(19) = -1; /* Output: Mflops for LU factorization */
pardiso_iparam(20) = 0; /* Output: Numbers of CG Iterations */
// --------------------------------------------------------------------
// Reordering and Symbolic Factorization. This step also allocates
// all memory that is necessary for the factorization.
// --------------------------------------------------------------------
pardiso_phase = 11;
PARDISO( pardiso_pt.begin(), &pardiso_maxfct, &pardiso_mnum, &pardiso_mtype, &pardiso_phase,
&pardiso_n, pardiso_a, pardiso_ia, pardiso_ja, pardiso_perm.begin(), &pardiso_nrhs,
pardiso_iparam.begin(), &pardiso_msglvl, 0, 0, &pardiso_error);
if (pardiso_error != 0)
{
log << "riordino e fattorizzazione simbolica falliti, codice: " << pardiso_error << "\n";
return -1;
}
log << "\tRiordino e fattorizzazione simbolica completata"
<< "\n\t\tFactor NNZ=" << pardiso_iparam(18)
<< "\n\t\tMFLOPS =" << pardiso_iparam(19);
// --------------------------------------------------------------------
// Numerical factorization.
// --------------------------------------------------------------------
pardiso_phase = 22;
PARDISO( pardiso_pt.begin(), &pardiso_maxfct, &pardiso_mnum, &pardiso_mtype, &pardiso_phase,
&pardiso_n, pardiso_a, pardiso_ia, pardiso_ja, pardiso_perm.begin(), &pardiso_nrhs,
pardiso_iparam.begin(), &pardiso_msglvl, 0, 0, &pardiso_error);
if (pardiso_error != 0)
{
log << " fattorizzazione numerica fallita, codice pardiso=" << pardiso_error << "\n";
return -1;
}
// --------------------------------------------------------------------*/
// Back substitution and iterative refinement. */
// --------------------------------------------------------------------*/
pardiso_phase = 33;
pardiso_nrhs=B.nrows();
pardiso_iparam(6) = 0; // Write solution into x. Attenzione, anche se lo pongo ad 1 in modo che la soluzione sovrascriva F, X viene comunque usato
PARDISO( pardiso_pt.begin(), &pardiso_maxfct, &pardiso_mnum, &pardiso_mtype, &pardiso_phase,
&pardiso_n, pardiso_a, pardiso_ia, pardiso_ja, pardiso_perm.begin(), &pardiso_nrhs,
pardiso_iparam.begin(), &pardiso_msglvl, B.begin(), X.begin(), &pardiso_error);
if (pardiso_error != 0)
{
log << "Errore nella fase di sostituzione all'indietro e rifinitura iteritava, codice: " << pardiso_error << "\n";
return -1;
}
// --------------------------------------------------------------------
// Termination and release of memory.
// --------------------------------------------------------------------
pardiso_phase = -1; /* Release internal memory. */
PARDISO( pardiso_pt.begin(), &pardiso_maxfct, &pardiso_mnum, &pardiso_mtype, &pardiso_phase,
&pardiso_n, pardiso_a, pardiso_ia, pardiso_ja, pardiso_perm.begin(), &pardiso_nrhs,
pardiso_iparam.begin(), &pardiso_msglvl, 0, 0, &pardiso_error);
return 1;
}
int main (int argc, char **argv)
{
/* Matrix data. */
CRS_MATRIX *M1, *M2;
double *b1, *x1, *b2, *x2, *r;
int n;
int nvals;
FILE *fp;
if (argc == 1) {
fp = stdin;
}
else if (argc == 2) {
fp = fopen (*argv, "r");
}
else {
fprintf (stderr, "Usage: pardisoTestExample [<fileName>]\n");
exit (1);
}
M1 = readCRSMatrix (fp, /*symmetric=*/1);
n = M1->nrows;
b1 = readVector (fp, n);
x1 = (double*)malloc(n*sizeof(double));
r = (double*)malloc(n*sizeof(double));
// ja -> M1->colIdxs;
// a -> M1->vals;
// ia -> M1->rowOffs
int mtype = -2; /* Real symmetric matrix */
int nrhs = 1; /* Number of right hand sides. */
/* Internal solver memory pointer pt, */
/* 32-bit: int pt[64]; 64-bit: long int pt[64] */
/* or void *pt[64] should be OK on both architectures */
void *pt[64];
/* Pardiso control parameters. */
int iparm[64];
int maxfct, mnum, phase, error, msglvl;
/* Number of processors. */
int num_procs;
/* Auxiliary variables. */
char *var;
int i;
double ddum; /* Double dummy */
int idum; /* Integer dummy. */
double t0, t1;
/* -------------------------------------------------------------------- */
/* .. Setup Pardiso control parameters. */
/* -------------------------------------------------------------------- */
error = 0;
//solver = 0; /* use sparse direct solver */
// do we need this, or will init take care of it?
for (i=0; i<64; i++) {
pt[i] = (void*)0;
}
for (i=0; i<64; i++) {
iparm[i] = 0;
}
iparm[0] = 1; /* Don't use solver default values */
iparm[1] = 3; /* Fill-in reordering from OpenMP METIS */
/* Numbers of processors; if 0, defaults to max number or MKL_NUM_THREADS */
iparm[2] = 0;
iparm[3] = 0; /* No iterative-direct algorithm */
iparm[4] = 0; /* No user fill-in reducing permutation */
iparm[5] = 0; /* Write solution into x */
iparm[6] = 0; /* Not in use */
iparm[7] = 0; /* Max numbers of iterative refinement steps */
iparm[8] = 0; /* Not in use */
iparm[9] = 13; /* Perturb the pivot elements with 1E-13 */
iparm[10] = 1; /* Use nonsymmetric permutation and scaling MPS */
iparm[11] = 0; /* Not in use */
iparm[12] = 0; /* Maximum weighted matching algorithm is switched-off (default for symmetric). Try iparm[12] = 1 in case of inappropriate accuracy */
iparm[13] = 0; /* Output: Number of perturbed pivots */
iparm[14] = 0; /* Not in use */
iparm[15] = 0; /* Not in use */
iparm[16] = 0; /* Not in use */
iparm[17] = -1; /* Output: Number of nonzeros in the factor LU */
iparm[18] = -1; /* Output: Mflops for LU factorization */
iparm[19] = 0; /* Output: Numbers of CG Iterations */
iparm[20] = 1; /* use 1x1 and 2x2 pivoting
//F77_FUNC(pardisoinit) (pt, &mtype, &solver, iparm, &error);
if (error != 0)
{
if (error == -10 )
printf("No license file found \n");
if (error == -11 )
printf("License is expired \n");
if (error == -12 )
printf("Wrong username or hostname \n");
return 1;
}
else
{ printf("PARDISO license check was successful ... \n");
}
/* Numbers of processors, value of OMP_NUM_THREADS */
var = getenv("OMP_NUM_THREADS");
if(var != NULL)
sscanf( var, "%d", &num_procs );
else {
printf("Set environment OMP_NUM_THREADS to 1");
exit(1);
}
iparm[2] = num_procs;
// other special settings
iparm[1] = 3; // 2 for metis, 0 for AMD
iparm[9] = 12;
iparm[10] = 1;
iparm[12] = 1; // setting this to 2 can cause errors sometimes
maxfct = 1; /* Maximum number of numerical factorizations. */
mnum = 1; /* Which factorization to use. */
msglvl = 0; /* Print statistical information */
error = 0; /* Initialize error flag */
/* -------------------------------------------------------------------- */
/* .. Reordering and Symbolic Factorization. This step also allocates */
/* all memory that is necessary for the factorization. */
/* -------------------------------------------------------------------- */
phase = 11;
t0 = currentTimeUsec();
PARDISO (pt, &maxfct, &mnum, &mtype, &phase,
&n, M1->vals, M1->rowOffs, M1->colIdxs, &idum, &nrhs,
iparm, &msglvl, &ddum, &ddum, &error);
t1 = currentTimeUsec();
if (error != 0) {
printf("ERROR during symbolic factorization: %d\n", error);
exit(1);
}
printf("Analyze: msec=%8.1f\n", (t1-t0)/1000.0);
printf("Number of nonzeros in factors = %d\n", iparm[17]);
printf("Number of factorization MFLOPS = %d\n", iparm[18]);
/* -------------------------------------------------------------------- */
/* .. Numerical factorization. */
/* -------------------------------------------------------------------- */
phase = 22;
t0 = currentTimeUsec();
PARDISO (pt, &maxfct, &mnum, &mtype, &phase,
&n, M1->vals, M1->rowOffs, M1->colIdxs, &idum, &nrhs,
iparm, &msglvl, &ddum, &ddum, &error);
t1 = currentTimeUsec();
if (error != 0) {
printf("ERROR during numerical factorization: %d\n", error);
exit(2);
}
printf("Factor: msec=%8.1f\n", (t1-t0)/1000.0);
/* -------------------------------------------------------------------- */
/* .. Back substitution and iterative refinement. */
/* -------------------------------------------------------------------- */
phase = 33;
iparm[7] = 1; /* Max numbers of iterative refinement steps. */
t0 = currentTimeUsec();
PARDISO (pt, &maxfct, &mnum, &mtype, &phase,
&n, M1->vals, M1->rowOffs, M1->colIdxs, &idum, &nrhs,
iparm, &msglvl, b1, x1, &error);
t1 = currentTimeUsec();
if (error != 0) {
printf("ERROR during solution: %d\n", error);
exit(3);
}
mulVector (r, M1, x1);
subVector (r, r, b1, n);
printf("Solve: msec=%8.1f\n\n", (t1-t0)/1000.0);
/* for (i=0; i<n; i++) { */
/* printf ("%g ", x1[i]); */
/* } */
/* printf ("\n"); */
printf("residual=%g\n", normVector(r, n));
#if 0
M2 = readCRSMatrix (fp, /*symmetric=*/1);
n = M2->nrows;
b2 = readVector (fp, n);
x2 = (double*)malloc(n*sizeof(double));
setVector (x2, x1, n);
iparm[7] = 1; /* Max numbers of iterative refinement steps. */
iparm[3] = 102;
printf ("maxfct=%d\n", maxfct);
printf ("mnum=%d\n", mnum);
printf ("mtype=%d\n", mtype);
printf ("phase=%d\n", phase);
printf ("idum=%d\n", idum);
for (i=0; i<64; i++) {
printf ("%d ", iparm[i]);
}
printf ("\n");
t0 = currentTimeUsec();
PARDISO (pt, &maxfct, &mnum, &mtype, &phase,
&n, M2->vals, M2->rowOffs, M2->colIdxs, &idum, &nrhs,
iparm, &msglvl, b2, x2, &error);
t1 = currentTimeUsec();
if (error != 0) {
printf("ERROR during solution: %d\n", error);
exit(3);
}
printf ("num iterations=%d\n", iparm[19]);
for (i=0; i<n; i++) {
printf ("%g ", x2[i]);
}
printf ("\n");
printf("Solve: msec=%8.1f\n\n", (t1-t0)/1000.0);
mulVector (r, M2, x2);
subVector (r, r, b2, n);
printf("residual=%g\n", normVector(r, n));
#endif
/* -------------------------------------------------------------------- */
/* .. Termination and release of memory. */
/* -------------------------------------------------------------------- */
phase = -1; /* Release internal memory. */
PARDISO (pt, &maxfct, &mnum, &mtype, &phase,
&n, &ddum, M1->rowOffs, M1->colIdxs, &idum, &nrhs,
iparm, &msglvl, &ddum, &ddum, &error);
return 0;
}
PardisoSolver::PardisoSolver(const SparseMatrix * A, int numThreads_, matrixType mtype_, reorderingType rtype_, int directIterative_, int verbose_): numThreads(numThreads_), mtype(mtype_), rtype(rtype_), directIterative(directIterative_), verbose(verbose_)
{
mkl_set_num_threads(numThreads);
n = A->Getn();
if (verbose >= 1)
printf("Converting matrix to Pardiso format...\n");
int numEntries;
int upperTriangleOnly;
if ((mtype == REAL_SPD) || (mtype == REAL_SYM_INDEFINITE)) // matrix is symmetric
{
numEntries = A->GetNumUpperTriangleEntries();
upperTriangleOnly = 1;
}
else
{
// structural symmetric or unsymmetric
numEntries = A->GetNumEntries();
upperTriangleOnly = 0;
}
a = (double*) malloc (sizeof(double) * numEntries);
ia = (int*) malloc (sizeof(int) * (A->GetNumRows() + 1));
ja = (int*) malloc (sizeof(int) * numEntries);
int oneIndexed = 1;
A->GenerateCompressedRowMajorFormat(a, ia, ja, upperTriangleOnly, oneIndexed);
if (verbose >= 2)
printf("numEntries: %d\n", numEntries);
// permute & do symbolic factorization
nrhs = 1; // Number of right hand sides.
maxfct = 1; // Maximum number of numerical factorizations.
mnum = 1; // Which factorization to use.
msglvl = verbose >= 1 ? verbose - 1 : 0; // Print statistical information to the output file
error = 0; // Initialize error flag
for (int i = 0; i < 64; i++)
iparm[i] = 0;
iparm[0] = 1; // Do not use the solver default values (use custom values, provided below)
iparm[1] = rtype; // matrix re-ordering algorithm
iparm[2] = 0; // unused
// use iterative-direct algorithm if requested
if (directIterative)
{
if (mtype == REAL_SPD)
iparm[3] = 62; // matrix is symmetric positive-definite; use CGS iteration for symmetric positive-definite matrices
else
iparm[3] = 61; // use CGS iteration
}
else
iparm[3] = 0;
iparm[4] = 0; // No user fill-in reducing permutation
iparm[5] = 0; // Write solution into x
iparm[6] = 0; // Output: number of iterative refinement steps performed
iparm[7] = 0; // Max numbers of iterative refinement steps (used during the solving stage). Value of 0 (default) means: The solver automatically performs two steps of iterative refinement when perturbed pivots are obtained during the numerical factorization.
iparm[8] = 0; // Reserved. Must set to 0.
// Pivoting perturbation; the values below are Pardiso's default values
// Pivoting only applies to REAL_UNSYM and REAL_SYM_INDEFINITE
if (mtype == REAL_UNSYM)
iparm[9] = 13; // For non-symmetric matrices, perturb the pivot elements with 1E-13
else
iparm[9] = 8; // Use 1.0E-8 for symmetric indefinite matrices
// Scaling and matching. The following below are the Pardiso defaults.
if (mtype == REAL_UNSYM) // unsymmetric matrices
{
iparm[10] = 1; // enable scaling
iparm[12] = 1; // enable matching
}
else
{
iparm[10] = 0; // disable scaling
iparm[12] = 0; // disable matching
}
iparm[11] = 0; // Solve with transposed or conjugate transposed matrix A. Not in use here.
iparm[13] = 0; // Output: Number of perturbed pivots
iparm[14] = 0; // Output: Peak memory on symbolic factorization (in KB)
iparm[15] = 0; // Output: Permanent memory on symbolic factorization (in KB)
iparm[16] = 0; // Output: Size of factors/Peak memory on numerical factorization and solution (in KB)
iparm[17] = -1; // Output: Report the number of non-zero elements in the factors.
iparm[18] = 0; // Report number of floating point operations (in 10^6 floating point operations) that are necessary to factor the matrix A. Disabled.
iparm[19] = 0; // Output: Report CG/CGS diagnostics.
iparm[20] = 1; // Pivoting for symmetric indefinite matrices: Apply 1x1 and 2x2 Bunch-Kaufman pivoting during the factorization process.
iparm[21] = 0; // Output: Inertia: number of positive eigenvalues.
iparm[22] = 0; // Output: Inertia: number of negative eigenvalues.
iparm[23] = 0; // Parallel factorization control. Use default.
iparm[24] = 0; // Parallel forward/backward solve control. Intel MKL PARDISO uses a parallel algorithm for the solve step.
// the other iparms (above 24) are left at 0
/* -------------------------------------------------------------------- *\
.. Initialize the internal solver memory pointer. This is only
necessary for the FIRST call of the PARDISO solver.
\* -------------------------------------------------------------------- */
for (int i=0; i<64; i++)
pt[i] = 0;
if (verbose >= 1)
printf("Reordering and symbolically factorizing the matrix...\n");
/* -------------------------------------------------------------------- *\
.. Reordering and Symbolic Factorization. This step also allocates
all memory that is necessary for the factorization.
\* -------------------------------------------------------------------- */
phase = 11;
PARDISO (pt, &maxfct, &mnum, (MKL_INT*)&mtype, &phase,
&n, a, ia, ja, NULL, &nrhs,
iparm, &msglvl, NULL, NULL, &error);
if (error != 0)
{
printf("Error: Pardiso matrix re-ordering/symbolic factorization returned non-zero exit code %d.\n", error);
throw error;
}
if (verbose >= 2)
{
printf("\nReordering and symbolic factorization completed...\n");
printf("Number of nonzeros in factors = %d\n", iparm[17]);
printf("Number of factorization MFLOPS = %d\n", iparm[18]);
}
}
PardisoSolver::PardisoSolver(const SparseMatrix * A, int numThreads_, int positiveDefinite_, int directIterative_, int verbose_) : numThreads(numThreads_), positiveDefinite(positiveDefinite_), directIterative(directIterative_), verbose(verbose_)
{
mkl_set_num_threads(numThreads);
n = A->Getn();
if (verbose >= 1)
printf("Converting matrix to Pardiso format...\n");
int numUpperTriangleEntries = A->GetNumUpperTriangleEntries();
a = (double*) malloc (sizeof(double) * numUpperTriangleEntries);
ia = (int*) malloc (sizeof(int) * (A->GetNumRows() + 1));
ja = (int*) malloc (sizeof(int) * numUpperTriangleEntries);
int upperTriangleOnly = 1;
int oneIndexed = 1;
A->GenerateCompressedRowMajorFormat(a, ia, ja, upperTriangleOnly, oneIndexed);
if (verbose >= 2)
printf("numUpperTriEntries: %d\n", numUpperTriangleEntries);
// permute & do symbolic factorization
mtype = positiveDefinite ? 2 : -2;
nrhs = 1; /* Number of right hand sides. */
maxfct = 1; /* Maximum number of numerical factorizations. */
mnum = 1; /* Which factorization to use. */
msglvl = verbose >= 1 ? verbose-1 : 0; /* Print statistical information in file */
error = 0; /* Initialize error flag */
for (int i = 0; i < 64; i++)
iparm[i] = 0;
iparm[0] = 1; // No solver default
iparm[1] = 2; // 0=minimum degree ordering, 2=Fill-in reordering from METIS
iparm[2] = numThreads; // Numbers of processors, value of OMP_NUM_THREADS
iparm[3] = directIterative ? 62 : 0; //62; // No iterative-direct algorithm
iparm[4] = 0; // No user fill-in reducing permutation
iparm[5] = 0; // Write solution into x
iparm[6] = 0; // Not in use
iparm[7] = 2; // Max numbers of iterative refinement steps
iparm[8] = 0; // Not in use
iparm[9] = 8; //13; // Perturb the pivot elements with 1E-13
iparm[10] = 0; //1; // Use nonsymmetric permutation and scaling MPS
iparm[11] = 0; // Not in use
iparm[12] = 0; // matchings for highly indefinite symmetric matrices
iparm[13] = 0; // Output: Number of perturbed pivots
iparm[14] = 0; // Not in use
iparm[15] = 0; // Not in use
iparm[16] = 0; // Not in use
iparm[17] = -1; // Output: Number of nonzeros in the factor LU
iparm[18] = 0; // no Output: Mflops for LU factorization
iparm[19] = 0; // Output: Numbers of CG Iterations
iparm[20] = 1; // pivoting method
/*
iparm[0] = 0;
iparm[2] = numThreads;
*/
/* -------------------------------------------------------------------- */
/* .. Initialize the internal solver memory pointer. This is only */
/* necessary for the FIRST call of the PARDISO solver. */
/* -------------------------------------------------------------------- */
for (int i=0; i<64; i++)
pt[i] = 0;
if (verbose >= 1)
printf("Reordering matrix...\n");
/* -------------------------------------------------------------------- */
/* .. Reordering and Symbolic Factorization. This step also allocates */
/* all memory that is necessary for the factorization. */
/* -------------------------------------------------------------------- */
phase = 11;
PARDISO (pt, &maxfct, &mnum, &mtype, &phase,
&n, a, ia, ja, NULL, &nrhs,
iparm, &msglvl, NULL, NULL, &error);
if (error != 0)
{
printf("Error: Pardiso matrix re-ordering returned non-zero exit code %d.\n", error);
throw error;
}
if (verbose >= 2)
{
printf("\nReordering completed ...\n");
printf("Number of nonzeros in factors = %d\n", iparm[17]);
printf("Number of factorization MFLOPS = %d\n", iparm[18]);
}
}