Date: 2026-03-01T05:24:56+00:00

Actual source code: pastix.c

      1: /*
      2:  Provides an interface to the PaStiX sparse solver
      3:  */
      4: #include <../src/mat/impls/aij/seq/aij.h>
      5: #include <../src/mat/impls/aij/mpi/mpiaij.h>
      6: #include <../src/mat/impls/sbaij/seq/sbaij.h>
      7: #include <../src/mat/impls/sbaij/mpi/mpisbaij.h>

      9: #if defined(PETSC_USE_COMPLEX)
     10:   #define _H_COMPLEX
     11: #endif

     13: #include <pastix.h>

     15: #if defined(PETSC_USE_COMPLEX)
     16:   #if defined(PETSC_USE_REAL_SINGLE)
     17:     #define SPM_FLTTYPE SpmComplex32
     18:   #else
     19:     #define SPM_FLTTYPE SpmComplex64
     20:   #endif
     21: #else /* PETSC_USE_COMPLEX */

     23:   #if defined(PETSC_USE_REAL_SINGLE)
     24:     #define SPM_FLTTYPE SpmFloat
     25:   #else
     26:     #define SPM_FLTTYPE SpmDouble
     27:   #endif

     29: #endif /* PETSC_USE_COMPLEX */

     31: typedef PetscScalar PastixScalar;

     33: typedef struct Mat_Pastix_ {
     34:   pastix_data_t *pastix_data;       /* Pastix data storage structure                             */
     35:   MPI_Comm       comm;              /* MPI Communicator used to initialize pastix                */
     36:   spmatrix_t    *spm;               /* SPM matrix structure                                      */
     37:   MatStructure   matstruc;          /* DIFFERENT_NONZERO_PATTERN if uninitialized, SAME otherwise */
     38:   PetscScalar   *rhs;               /* Right-hand-side member                                    */
     39:   PetscInt       rhsnbr;            /* Right-hand-side number                                    */
     40:   pastix_int_t   iparm[IPARM_SIZE]; /* Integer parameters                                        */
     41:   double         dparm[DPARM_SIZE]; /* Floating point parameters                                 */
     42: } Mat_Pastix;

     44: /*
     45:    convert PETSc matrix to SPM structure

     47:   input:
     48:     A       - matrix in aij, baij or sbaij format
     49:     reuse   - MAT_INITIAL_MATRIX: spaces are allocated and values are set for the triple
     50:               MAT_REUSE_MATRIX:   only the values in v array are updated
     51:   output:
     52:     spm     - The SPM built from A
     53:  */
     54: static PetscErrorCode MatConvertToSPM(Mat A, MatReuse reuse, Mat_Pastix *pastix)
     55: {
     56:   Mat                A_loc, A_aij;
     57:   const PetscInt    *row, *col;
     58:   PetscInt           n, i;
     59:   const PetscScalar *val;
     60:   PetscBool          ismpiaij, isseqaij, ismpisbaij, isseqsbaij;
     61:   PetscBool          flag;
     62:   spmatrix_t         spm2, *spm = NULL;
     63:   int                spm_err;

     65:   PetscFunctionBegin;
     66:   /* Get A datas */
     67:   PetscCall(PetscObjectBaseTypeCompare((PetscObject)A, MATSEQAIJ, &isseqaij));
     68:   PetscCall(PetscObjectBaseTypeCompare((PetscObject)A, MATMPIAIJ, &ismpiaij));
     69:   /* TODO: Block Aij should be handled with dof in spm */
     70:   PetscCall(PetscObjectBaseTypeCompare((PetscObject)A, MATSEQSBAIJ, &isseqsbaij));
     71:   PetscCall(PetscObjectBaseTypeCompare((PetscObject)A, MATMPISBAIJ, &ismpisbaij));

     73:   if (isseqsbaij || ismpisbaij) PetscCall(MatConvert(A, MATAIJ, reuse, &A_aij));
     74:   else A_aij = A;

     76:   if (ismpiaij || ismpisbaij) PetscCall(MatMPIAIJGetLocalMat(A_aij, MAT_INITIAL_MATRIX, &A_loc));
     77:   else if (isseqaij || isseqsbaij) A_loc = A_aij;
     78:   else SETERRQ(PetscObjectComm((PetscObject)A_aij), PETSC_ERR_SUP, "Not for type %s", ((PetscObject)A)->type_name);

     80:   /* Use getRowIJ and the trick CSC/CSR instead of GetColumnIJ for performance */
     81:   PetscCall(MatGetRowIJ(A_loc, 0, PETSC_FALSE, PETSC_FALSE, &n, &row, &col, &flag));
     82:   PetscCheck(flag, PETSC_COMM_SELF, PETSC_ERR_SUP, "GetRowIJ failed");
     83:   PetscCall(MatSeqAIJGetArrayRead(A_loc, &val));

     85:   PetscCall(PetscMalloc1(1, &spm));
     86:   PetscStackCallExternalVoid("spmInitDist", spmInitDist(spm, pastix->comm));

     88:   spm->n          = n;
     89:   spm->nnz        = row[n];
     90:   spm->fmttype    = SpmCSR;
     91:   spm->flttype    = SPM_FLTTYPE;
     92:   spm->replicated = !(A->rmap->n != A->rmap->N);

     94:   PetscStackCallExternalVoid("spmUpdateComputedFields", spmUpdateComputedFields(spm));
     95:   PetscStackCallExternalVoid("spmAlloc", spmAlloc(spm));

     97:   /* Get data distribution */
     98:   if (!spm->replicated) {
     99:     for (i = A->rmap->rstart; i < A->rmap->rend; i++) spm->loc2glob[i - A->rmap->rstart] = i;
    100:   }

    102:   /* Copy  arrays */
    103:   PetscCall(PetscArraycpy(spm->colptr, col, spm->nnz));
    104:   PetscCall(PetscArraycpy(spm->rowptr, row, spm->n + 1));
    105:   PetscCall(PetscArraycpy((PetscScalar *)spm->values, val, spm->nnzexp));
    106:   PetscCall(MatRestoreRowIJ(A_loc, 0, PETSC_FALSE, PETSC_FALSE, &n, &row, &col, &flag));
    107:   PetscCheck(flag, PETSC_COMM_SELF, PETSC_ERR_SUP, "RestoreRowIJ failed");
    108:   PetscCall(MatSeqAIJRestoreArrayRead(A_loc, &val));
    109:   if (ismpiaij || ismpisbaij) PetscCall(MatDestroy(&A_loc));

    111:   /*
    112:     PaStiX works only with CSC matrices for now, so let's lure him by telling him
    113:     that the PETSc CSR matrix is a CSC matrix.
    114:     Note that this is not available yet for Hermitian matrices and LL^h/LDL^h factorizations.
    115:    */
    116:   {
    117:     spm_int_t *tmp;
    118:     spm->fmttype                         = SpmCSC;
    119:     tmp                                  = spm->colptr;
    120:     spm->colptr                          = spm->rowptr;
    121:     spm->rowptr                          = tmp;
    122:     pastix->iparm[IPARM_TRANSPOSE_SOLVE] = PastixTrans;
    123:   }

    125:   /* Update matrix to be in PaStiX format */
    126:   PetscStackCallExternalVoid("spmCheckAndCorrect", spm_err = spmCheckAndCorrect(spm, &spm2));
    127:   if (spm_err != 0) {
    128:     PetscStackCallExternalVoid("spmExit", spmExit(spm));
    129:     *spm = spm2;
    130:   }

    132:   if (isseqsbaij || ismpisbaij) PetscCall(MatDestroy(&A_aij));

    134:   pastix->spm = spm;
    135:   PetscFunctionReturn(PETSC_SUCCESS);
    136: }

    138: /*
    139:   Call clean step of PaStiX if initialized
    140:   Free the SpM matrix and the PaStiX instance.
    141:  */
    142: static PetscErrorCode MatDestroy_PaStiX(Mat A)
    143: {
    144:   Mat_Pastix *pastix = (Mat_Pastix *)A->data;

    146:   PetscFunctionBegin;
    147:   /* Finalize SPM (matrix handler of PaStiX) */
    148:   if (pastix->spm) {
    149:     PetscStackCallExternalVoid("spmExit", spmExit(pastix->spm));
    150:     PetscCall(PetscFree(pastix->spm));
    151:   }

    153:   /* clear composed functions */
    154:   PetscCall(PetscObjectComposeFunction((PetscObject)A, "MatFactorGetSolverType_C", NULL));

    156:   /* Finalize PaStiX */
    157:   if (pastix->pastix_data) pastixFinalize(&pastix->pastix_data);

    159:   /* Deallocate PaStiX structure */
    160:   PetscCall(PetscFree(A->data));
    161:   PetscFunctionReturn(PETSC_SUCCESS);
    162: }

    164: /*
    165:   Gather right-hand side.
    166:   Call for Solve step.
    167:   Scatter solution.
    168:  */
    169: static PetscErrorCode MatSolve_PaStiX(Mat A, Vec b, Vec x)
    170: {
    171:   Mat_Pastix        *pastix = (Mat_Pastix *)A->data;
    172:   const PetscScalar *bptr;
    173:   PetscInt           ldrhs;

    175:   PetscFunctionBegin;
    176:   pastix->rhsnbr = 1;
    177:   ldrhs          = pastix->spm->n;

    179:   PetscCall(VecCopy(b, x));
    180:   PetscCall(VecGetArray(x, &pastix->rhs));
    181:   PetscCall(VecGetArrayRead(b, &bptr));

    183:   /* solve phase */
    184:   /*-------------*/
    185:   PetscCheck(pastix->pastix_data, PETSC_COMM_SELF, PETSC_ERR_SUP, "PaStiX hasn't been initialized");
    186:   PetscCallExternal(pastix_task_solve, pastix->pastix_data, ldrhs, pastix->rhsnbr, pastix->rhs, ldrhs);
    187:   PetscCallExternal(pastix_task_refine, pastix->pastix_data, ldrhs, pastix->rhsnbr, (PetscScalar *)bptr, ldrhs, pastix->rhs, ldrhs);

    189:   PetscCall(VecRestoreArray(x, &pastix->rhs));
    190:   PetscCall(VecRestoreArrayRead(b, &bptr));
    191:   PetscFunctionReturn(PETSC_SUCCESS);
    192: }

    194: /*
    195:   Numeric factorisation using PaStiX solver.

    197:   input:
    198:     F       - PETSc matrix that contains PaStiX interface.
    199:     A       - PETSc matrix in aij, bail or sbaij format
    200:  */
    201: static PetscErrorCode MatFactorNumeric_PaStiX(Mat F, Mat A, const MatFactorInfo *info)
    202: {
    203:   Mat_Pastix *pastix = (Mat_Pastix *)F->data;

    205:   PetscFunctionBegin;
    206:   F->ops->solve = MatSolve_PaStiX;

    208:   /* Perform Numerical Factorization */
    209:   PetscCheck(pastix->pastix_data, PETSC_COMM_SELF, PETSC_ERR_SUP, "PaStiX hasn't been initialized");
    210:   PetscCallExternal(pastix_task_numfact, pastix->pastix_data, pastix->spm);

    212:   F->assembled = PETSC_TRUE;
    213:   PetscFunctionReturn(PETSC_SUCCESS);
    214: }

    216: static PetscErrorCode MatLUFactorNumeric_PaStiX(Mat F, Mat A, const MatFactorInfo *info)
    217: {
    218:   Mat_Pastix *pastix = (Mat_Pastix *)F->data;

    220:   PetscFunctionBegin;
    221:   PetscCheck(pastix->iparm[IPARM_FACTORIZATION] == PastixFactGETRF, PetscObjectComm((PetscObject)F), PETSC_ERR_SUP, "Incorrect factorization type for symbolic and numerical factorization by PaStiX");
    222:   pastix->iparm[IPARM_FACTORIZATION] = PastixFactGETRF;
    223:   PetscCall(MatFactorNumeric_PaStiX(F, A, info));
    224:   PetscFunctionReturn(PETSC_SUCCESS);
    225: }

    227: static PetscErrorCode MatCholeskyFactorNumeric_PaStiX(Mat F, Mat A, const MatFactorInfo *info)
    228: {
    229:   Mat_Pastix *pastix = (Mat_Pastix *)F->data;

    231:   PetscFunctionBegin;
    232:   PetscCheck(pastix->iparm[IPARM_FACTORIZATION] == PastixFactSYTRF, PetscObjectComm((PetscObject)F), PETSC_ERR_SUP, "Incorrect factorization type for symbolic and numerical factorization by PaStiX");
    233:   pastix->iparm[IPARM_FACTORIZATION] = PastixFactSYTRF;
    234:   PetscCall(MatFactorNumeric_PaStiX(F, A, info));
    235:   PetscFunctionReturn(PETSC_SUCCESS);
    236: }

    238: /*
    239:   Perform Ordering step and Symbolic Factorization step

    241:   Note the PETSc r and c permutations are ignored
    242:   input:
    243:     F       - PETSc matrix that contains PaStiX interface.
    244:     A       - matrix in aij, bail or sbaij format
    245:     r       - permutation ?
    246:     c       - TODO
    247:     info    - Information about the factorization to perform.
    248:   output:
    249:     pastix_data - This instance will be updated with the SolverMatrix allocated.
    250:  */
    251: static PetscErrorCode MatFactorSymbolic_PaStiX(Mat F, Mat A, IS r, IS c, const MatFactorInfo *info)
    252: {
    253:   Mat_Pastix *pastix = (Mat_Pastix *)F->data;

    255:   PetscFunctionBegin;
    256:   pastix->matstruc = DIFFERENT_NONZERO_PATTERN;

    258:   /* Initialise SPM structure */
    259:   PetscCall(MatConvertToSPM(A, MAT_INITIAL_MATRIX, pastix));

    261:   /* Ordering - Symbolic factorization - Build SolverMatrix  */
    262:   PetscCheck(pastix->pastix_data, PETSC_COMM_SELF, PETSC_ERR_SUP, "PaStiX hasn't been initialized");
    263:   PetscCallExternal(pastix_task_analyze, pastix->pastix_data, pastix->spm);
    264:   PetscFunctionReturn(PETSC_SUCCESS);
    265: }

    267: static PetscErrorCode MatLUFactorSymbolic_PaStiX(Mat F, Mat A, IS r, IS c, const MatFactorInfo *info)
    268: {
    269:   Mat_Pastix *pastix = (Mat_Pastix *)F->data;

    271:   PetscFunctionBegin;
    272:   pastix->iparm[IPARM_FACTORIZATION] = PastixFactGETRF;
    273:   PetscCall(MatFactorSymbolic_PaStiX(F, A, r, c, info));
    274:   PetscFunctionReturn(PETSC_SUCCESS);
    275: }

    277: /* Note the PETSc r permutation is ignored */
    278: static PetscErrorCode MatCholeskyFactorSymbolic_PaStiX(Mat F, Mat A, IS r, const MatFactorInfo *info)
    279: {
    280:   Mat_Pastix *pastix = (Mat_Pastix *)F->data;

    282:   PetscFunctionBegin;
    283:   /* Warning: Cholesky in PETSc wrapper does not handle (complex) Hermitian matrices.
    284:      The factorization type can be forced using the parameter
    285:      mat_pastix_factorization (see enum pastix_factotype_e in
    286:      https://solverstack.gitlabpages.inria.fr/pastix/group__pastix__api.html). */
    287:   pastix->iparm[IPARM_FACTORIZATION] = PastixFactSYTRF;
    288:   PetscCall(MatFactorSymbolic_PaStiX(F, A, r, NULL, info));
    289:   PetscFunctionReturn(PETSC_SUCCESS);
    290: }

    292: static PetscErrorCode MatView_PaStiX(Mat A, PetscViewer viewer)
    293: {
    294:   PetscBool         isascii;
    295:   PetscViewerFormat format;

    297:   PetscFunctionBegin;
    298:   PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERASCII, &isascii));
    299:   if (isascii) {
    300:     PetscCall(PetscViewerGetFormat(viewer, &format));
    301:     if (format == PETSC_VIEWER_ASCII_INFO) {
    302:       Mat_Pastix *pastix = (Mat_Pastix *)A->data;
    303:       spmatrix_t *spm    = pastix->spm;
    304:       PetscCheck(!spm, PETSC_COMM_SELF, PETSC_ERR_SUP, "Sparse matrix isn't initialized");

    306:       PetscCall(PetscViewerASCIIPrintf(viewer, "PaStiX run parameters:\n"));
    307:       PetscCall(PetscViewerASCIIPrintf(viewer, "  Matrix type :                      %s \n", ((spm->mtxtype == SpmSymmetric) ? "Symmetric" : "Unsymmetric")));
    308:       PetscCall(PetscViewerASCIIPrintf(viewer, "  Level of printing (0,1,2):         %ld \n", (long)pastix->iparm[IPARM_VERBOSE]));
    309:       PetscCall(PetscViewerASCIIPrintf(viewer, "  Number of refinements iterations : %ld \n", (long)pastix->iparm[IPARM_NBITER]));
    310:       PetscCall(PetscPrintf(PETSC_COMM_SELF, "  Error :                            %e \n", pastix->dparm[DPARM_RELATIVE_ERROR]));
    311:       if (pastix->iparm[IPARM_VERBOSE] > 0) spmPrintInfo(spm, stdout);
    312:     }
    313:   }
    314:   PetscFunctionReturn(PETSC_SUCCESS);
    315: }

    317: /*MC
    318:      MATSOLVERPASTIX  - A solver package providing direct solvers (LU) for distributed
    319:   and sequential matrices via the external package PaStiX.

    321:   Use `./configure --download-hwloc --download-metis --download-ptscotch --download-pastix --download-netlib-lapack [or MKL for ex. --with-blaslapack-dir=${MKLROOT}]`
    322:   to have PETSc installed with PasTiX.

    324:   Use `-pc_type lu` `-pc_factor_mat_solver_type pastix` to use this direct solver.

    326:   Options Database Keys:
    327:   -mat_pastix_verbose <0,1,2>             - print level of information messages from PaStiX
    328:   -mat_pastix_factorization <0,1,2,3,4>   - Factorization algorithm (Cholesky, LDL^t, LU, LL^t, LDL^h)
    329:   -mat_pastix_itermax <integer>           - Maximum number of iterations during refinement
    330:   -mat_pastix_epsilon_refinement <double> - Epsilon for refinement
    331:   -mat_pastix_epsilon_magn_ctrl <double>  - Epsilon for magnitude control
    332:   -mat_pastix_ordering <0,1>              - Ordering (Scotch or Metis)
    333:   -mat_pastix_thread_nbr <integer>        - Set the numbers of threads for each MPI process
    334:   -mat_pastix_scheduler <0,1,2,3,4>       - Scheduler (sequential, static, parsec, starpu, dynamic)
    335:   -mat_pastix_compress_when <0,1,2,3>     - When to compress (never, minimal-theory, just-in-time, supernodes)
    336:   -mat_pastix_compress_tolerance <double> - Tolerance for low-rank kernels.

    338:   Notes:
    339:     This only works for matrices with symmetric nonzero structure, if you pass it a matrix with
    340:    nonsymmetric structure PasTiX, and hence, PETSc return with an error.

    342:   Level: beginner

    344: .seealso: [](ch_matrices), `Mat`, `PCFactorSetMatSolverType()`, `MatSolverType`, `MatGetFactor()`
    345: M*/

    347: static PetscErrorCode MatGetInfo_PaStiX(Mat A, MatInfoType flag, MatInfo *info)
    348: {
    349:   Mat_Pastix *pastix = (Mat_Pastix *)A->data;

    351:   PetscFunctionBegin;
    352:   info->block_size        = 1.0;
    353:   info->nz_allocated      = pastix->iparm[IPARM_ALLOCATED_TERMS];
    354:   info->nz_used           = pastix->iparm[IPARM_NNZEROS];
    355:   info->nz_unneeded       = 0.0;
    356:   info->assemblies        = 0.0;
    357:   info->mallocs           = 0.0;
    358:   info->memory            = 0.0;
    359:   info->fill_ratio_given  = 0;
    360:   info->fill_ratio_needed = 0;
    361:   info->factor_mallocs    = 0;
    362:   PetscFunctionReturn(PETSC_SUCCESS);
    363: }

    365: static PetscErrorCode MatFactorGetSolverType_PaStiX(Mat A, MatSolverType *type)
    366: {
    367:   PetscFunctionBegin;
    368:   *type = MATSOLVERPASTIX;
    369:   PetscFunctionReturn(PETSC_SUCCESS);
    370: }

    372: /* Sets PaStiX options from the options database */
    373: static PetscErrorCode MatSetFromOptions_PaStiX(Mat A)
    374: {
    375:   Mat_Pastix   *pastix = (Mat_Pastix *)A->data;
    376:   pastix_int_t *iparm  = pastix->iparm;
    377:   double       *dparm  = pastix->dparm;
    378:   PetscInt      icntl;
    379:   PetscReal     dcntl;
    380:   PetscBool     set;

    382:   PetscFunctionBegin;
    383:   PetscOptionsBegin(PetscObjectComm((PetscObject)A), ((PetscObject)A)->prefix, "PaStiX Options", "Mat");

    385:   iparm[IPARM_VERBOSE] = 0;
    386:   iparm[IPARM_ITERMAX] = 20;

    388:   PetscCall(PetscOptionsRangeInt("-mat_pastix_verbose", "iparm[IPARM_VERBOSE] : level of printing (0 to 2)", "None", iparm[IPARM_VERBOSE], &icntl, &set, 0, 2));
    389:   if (set) iparm[IPARM_VERBOSE] = (pastix_int_t)icntl;

    391:   PetscCall(PetscOptionsRangeInt("-mat_pastix_factorization", "iparm[IPARM_FACTORIZATION]: Factorization algorithm", "None", iparm[IPARM_FACTORIZATION], &icntl, &set, 0, 4));
    392:   if (set) iparm[IPARM_FACTORIZATION] = (pastix_int_t)icntl;

    394:   PetscCall(PetscOptionsBoundedInt("-mat_pastix_itermax", "iparm[IPARM_ITERMAX]: Max iterations", "None", iparm[IPARM_ITERMAX], &icntl, &set, 1));
    395:   if (set) iparm[IPARM_ITERMAX] = (pastix_int_t)icntl;

    397:   PetscCall(PetscOptionsBoundedReal("-mat_pastix_epsilon_refinement", "dparm[DPARM_EPSILON_REFINEMENT]: Epsilon refinement", "None", dparm[DPARM_EPSILON_REFINEMENT], &dcntl, &set, -1.));
    398:   if (set) dparm[DPARM_EPSILON_REFINEMENT] = (double)dcntl;

    400:   PetscCall(PetscOptionsReal("-mat_pastix_epsilon_magn_ctrl", "dparm[DPARM_EPSILON_MAGN_CTRL]: Epsilon magnitude control", "None", dparm[DPARM_EPSILON_MAGN_CTRL], &dcntl, &set));
    401:   if (set) dparm[DPARM_EPSILON_MAGN_CTRL] = (double)dcntl;

    403:   PetscCall(PetscOptionsRangeInt("-mat_pastix_ordering", "iparm[IPARM_ORDERING]: Ordering algorithm", "None", iparm[IPARM_ORDERING], &icntl, &set, 0, 2));
    404:   if (set) iparm[IPARM_ORDERING] = (pastix_int_t)icntl;

    406:   PetscCall(PetscOptionsBoundedInt("-mat_pastix_thread_nbr", "iparm[IPARM_THREAD_NBR]: Number of thread by MPI node", "None", iparm[IPARM_THREAD_NBR], &icntl, &set, -1));
    407:   if (set) iparm[IPARM_THREAD_NBR] = (pastix_int_t)icntl;

    409:   PetscCall(PetscOptionsRangeInt("-mat_pastix_scheduler", "iparm[IPARM_SCHEDULER]: Scheduler", "None", iparm[IPARM_SCHEDULER], &icntl, &set, 0, 4));
    410:   if (set) iparm[IPARM_SCHEDULER] = (pastix_int_t)icntl;

    412:   PetscCall(PetscOptionsRangeInt("-mat_pastix_compress_when", "iparm[IPARM_COMPRESS_WHEN]: When to compress", "None", iparm[IPARM_COMPRESS_WHEN], &icntl, &set, 0, 3));
    413:   if (set) iparm[IPARM_COMPRESS_WHEN] = (pastix_int_t)icntl;

    415:   PetscCall(PetscOptionsBoundedReal("-mat_pastix_compress_tolerance", "dparm[DPARM_COMPRESS_TOLERANCE]: Tolerance for low-rank kernels", "None", dparm[DPARM_COMPRESS_TOLERANCE], &dcntl, &set, 0.));
    416:   if (set) dparm[DPARM_COMPRESS_TOLERANCE] = (double)dcntl;

    418:   PetscOptionsEnd();
    419:   PetscFunctionReturn(PETSC_SUCCESS);
    420: }

    422: static PetscErrorCode MatGetFactor_pastix(Mat A, MatFactorType ftype, Mat *F, const char *mattype)
    423: {
    424:   Mat         B;
    425:   Mat_Pastix *pastix;

    427:   PetscFunctionBegin;
    428:   /* Create the factorization matrix */
    429:   PetscCall(MatCreate(PetscObjectComm((PetscObject)A), &B));
    430:   PetscCall(MatSetSizes(B, A->rmap->n, A->cmap->n, A->rmap->N, A->cmap->N));
    431:   PetscCall(PetscStrallocpy(MATSOLVERPASTIX, &((PetscObject)B)->type_name));
    432:   PetscCall(MatSetUp(B));

    434:   PetscCheck(ftype == MAT_FACTOR_LU || ftype == MAT_FACTOR_CHOLESKY, PETSC_COMM_SELF, PETSC_ERR_SUP, "Factor type not supported by PaStiX");

    436:   /* set solvertype */
    437:   PetscCall(PetscFree(B->solvertype));
    438:   PetscCall(PetscStrallocpy(MATSOLVERPASTIX, &B->solvertype));

    440:   B->ops->lufactorsymbolic       = MatLUFactorSymbolic_PaStiX;
    441:   B->ops->lufactornumeric        = MatLUFactorNumeric_PaStiX;
    442:   B->ops->choleskyfactorsymbolic = MatCholeskyFactorSymbolic_PaStiX;
    443:   B->ops->choleskyfactornumeric  = MatCholeskyFactorNumeric_PaStiX;
    444:   B->ops->view                   = MatView_PaStiX;
    445:   B->ops->getinfo                = MatGetInfo_PaStiX;
    446:   B->ops->destroy                = MatDestroy_PaStiX;

    448:   PetscCall(PetscObjectComposeFunction((PetscObject)B, "MatFactorGetSolverType_C", MatFactorGetSolverType_PaStiX));

    450:   B->factortype = ftype;

    452:   /* Create the pastix structure */
    453:   PetscCall(PetscNew(&pastix));
    454:   B->data = (void *)pastix;

    456:   /* Call to set default pastix options */
    457:   PetscStackCallExternalVoid("pastixInitParam", pastixInitParam(pastix->iparm, pastix->dparm));
    458:   PetscCall(MatSetFromOptions_PaStiX(B));

    460:   /* Get PETSc communicator */
    461:   PetscCall(PetscObjectGetComm((PetscObject)A, &pastix->comm));

    463:   /* Initialise PaStiX structure */
    464:   pastix->iparm[IPARM_SCOTCH_MT] = 0;
    465:   PetscStackCallExternalVoid("pastixInit", pastixInit(&pastix->pastix_data, pastix->comm, pastix->iparm, pastix->dparm));

    467:   /* Warning: Cholesky in PETSc wrapper does not handle (complex) Hermitian matrices.
    468:      The factorization type can be forced using the parameter
    469:      mat_pastix_factorization (see enum pastix_factotype_e in
    470:      https://solverstack.gitlabpages.inria.fr/pastix/group__pastix__api.html). */
    471:   pastix->iparm[IPARM_FACTORIZATION] = ftype == MAT_FACTOR_CHOLESKY ? PastixFactSYTRF : PastixFactGETRF;

    473:   *F = B;
    474:   PetscFunctionReturn(PETSC_SUCCESS);
    475: }

    477: static PetscErrorCode MatGetFactor_mpiaij_pastix(Mat A, MatFactorType ftype, Mat *F)
    478: {
    479:   PetscFunctionBegin;
    480:   PetscCheck(ftype == MAT_FACTOR_LU, PETSC_COMM_SELF, PETSC_ERR_SUP, "Cannot use PETSc AIJ matrices with PaStiX Cholesky, use SBAIJ matrix");
    481:   PetscCall(MatGetFactor_pastix(A, ftype, F, MATMPIAIJ));
    482:   PetscFunctionReturn(PETSC_SUCCESS);
    483: }

    485: static PetscErrorCode MatGetFactor_seqaij_pastix(Mat A, MatFactorType ftype, Mat *F)
    486: {
    487:   PetscFunctionBegin;
    488:   PetscCheck(ftype == MAT_FACTOR_LU, PETSC_COMM_SELF, PETSC_ERR_SUP, "Cannot use PETSc AIJ matrices with PaStiX Cholesky, use SBAIJ matrix");
    489:   PetscCall(MatGetFactor_pastix(A, ftype, F, MATSEQAIJ));
    490:   PetscFunctionReturn(PETSC_SUCCESS);
    491: }

    493: static PetscErrorCode MatGetFactor_mpisbaij_pastix(Mat A, MatFactorType ftype, Mat *F)
    494: {
    495:   PetscFunctionBegin;
    496:   PetscCheck(ftype == MAT_FACTOR_CHOLESKY, PETSC_COMM_SELF, PETSC_ERR_SUP, "Cannot use PETSc SBAIJ matrices with PaStiX LU, use AIJ matrix");
    497:   PetscCall(MatGetFactor_pastix(A, ftype, F, MATMPISBAIJ));
    498:   PetscFunctionReturn(PETSC_SUCCESS);
    499: }

    501: static PetscErrorCode MatGetFactor_seqsbaij_pastix(Mat A, MatFactorType ftype, Mat *F)
    502: {
    503:   PetscFunctionBegin;
    504:   PetscCheck(ftype == MAT_FACTOR_CHOLESKY, PETSC_COMM_SELF, PETSC_ERR_SUP, "Cannot use PETSc SBAIJ matrices with PaStiX LU, use AIJ matrix");
    505:   PetscCall(MatGetFactor_pastix(A, ftype, F, MATSEQSBAIJ));
    506:   PetscFunctionReturn(PETSC_SUCCESS);
    507: }

    509: PETSC_INTERN PetscErrorCode MatSolverTypeRegister_Pastix(void)
    510: {
    511:   PetscFunctionBegin;
    512:   PetscCall(MatSolverTypeRegister(MATSOLVERPASTIX, MATMPIAIJ, MAT_FACTOR_LU, MatGetFactor_mpiaij_pastix));
    513:   PetscCall(MatSolverTypeRegister(MATSOLVERPASTIX, MATSEQAIJ, MAT_FACTOR_LU, MatGetFactor_seqaij_pastix));
    514:   PetscCall(MatSolverTypeRegister(MATSOLVERPASTIX, MATMPISBAIJ, MAT_FACTOR_CHOLESKY, MatGetFactor_mpisbaij_pastix));
    515:   PetscCall(MatSolverTypeRegister(MATSOLVERPASTIX, MATSEQSBAIJ, MAT_FACTOR_CHOLESKY, MatGetFactor_seqsbaij_pastix));
    516:   PetscFunctionReturn(PETSC_SUCCESS);
    517: }