Date: 2013-07-02T14:47:32+00:00

Actual source code: parms.c
petsc-3.4.2 2013-07-02

      1: #define PETSCKSP_DLL

      3: /*
      4:    Provides an interface to pARMS.
      5:    Requires pARMS 3.2 or later.
      6: */

      8: #include "petsc-private/pcimpl.h"          /*I "petscpc.h" I*/

     10: #if defined(PETSC_USE_COMPLEX)
     11: #define DBL_CMPLX
     12: #else
     13: #define DBL
     14: #endif
     15: #define USE_MPI
     16: #define REAL double
     17: #define HAS_BLAS
     18: #define FORTRAN_UNDERSCORE
     19: #include "parms_sys.h"
     20: #undef FLOAT
     21: #define FLOAT PetscScalar
     22: #include "parms.h"

     24: /*
     25:    Private context (data structure) for the  preconditioner.
     26: */
     27: typedef struct {
     28:   parms_Map         map;
     29:   parms_Mat         A;
     30:   parms_PC          pc;
     31:   PCPARMSGlobalType global;
     32:   PCPARMSLocalType  local;
     33:   PetscInt          levels, blocksize, maxdim, maxits, lfil[7];
     34:   PetscBool         nonsymperm, meth[8];
     35:   PetscReal         solvetol, indtol, droptol[7];
     36:   PetscScalar       *lvec0, *lvec1;
     37: } PC_PARMS;

     42: static PetscErrorCode PCSetUp_PARMS(PC pc)
     43: {
     44:   Mat               pmat;
     45:   PC_PARMS          *parms = (PC_PARMS*)pc->data;
     46:   const PetscInt    *mapptr0;
     47:   PetscInt          n, lsize, low, high, i, pos, ncols, length;
     48:   int               *maptmp, *mapptr, *ia, *ja, *ja1, *im;
     49:   PetscScalar       *aa, *aa1;
     50:   const PetscInt    *cols;
     51:   PetscInt          meth[8];
     52:   const PetscScalar *values;
     53:   PetscErrorCode    ierr;
     54:   MatInfo           matinfo;
     55:   PetscMPIInt       rank, npro;

     58:   /* Get preconditioner matrix from PETSc and setup pARMS structs */
     59:   PCGetOperators(pc,NULL,&pmat,NULL);
     60:   MPI_Comm_size(PetscObjectComm((PetscObject)pmat),&npro);
     61:   MPI_Comm_rank(PetscObjectComm((PetscObject)pmat),&rank);

     63:   MatGetSize(pmat,&n,NULL);
     64:   PetscMalloc((npro+1)*sizeof(int),&mapptr);
     65:   PetscMalloc(n*sizeof(int),&maptmp);
     66:   MatGetOwnershipRanges(pmat,&mapptr0);
     67:   low   = mapptr0[rank];
     68:   high  = mapptr0[rank+1];
     69:   lsize = high - low;

     71:   for (i=0; i<npro+1; i++) mapptr[i] = mapptr0[i]+1;
     72:   for (i = 0; i<n; i++) maptmp[i] = i+1;

     74:   /* if created, destroy the previous map */
     75:   if (parms->map) {
     76:     parms_MapFree(&parms->map);
     77:     parms->map = NULL;
     78:   }

     80:   /* create pARMS map object */
     81:   parms_MapCreateFromPtr(&parms->map,(int)n,maptmp,mapptr,PetscObjectComm((PetscObject)pmat),1,NONINTERLACED);

     83:   /* if created, destroy the previous pARMS matrix */
     84:   if (parms->A) {
     85:     parms_MatFree(&parms->A);
     86:     parms->A = NULL;
     87:   }

     89:   /* create pARMS mat object */
     90:   parms_MatCreate(&parms->A,parms->map);

     92:   /* setup and copy csr data structure for pARMS */
     93:   PetscMalloc((lsize+1)*sizeof(int),&ia);
     94:   ia[0]  = 1;
     95:   MatGetInfo(pmat,MAT_LOCAL,&matinfo);
     96:   length = matinfo.nz_used;
     97:   PetscMalloc(length*sizeof(int),&ja);
     98:   PetscMalloc(length*sizeof(PetscScalar),&aa);

    100:   for (i = low; i<high; i++) {
    101:     pos         = ia[i-low]-1;
    102:     MatGetRow(pmat,i,&ncols,&cols,&values);
    103:     ia[i-low+1] = ia[i-low] + ncols;

    105:     if (ia[i-low+1] >= length) {
    106:       length += ncols;
    107:       PetscMalloc(length*sizeof(int),&ja1);
    108:       PetscMemcpy(ja1,ja,(ia[i-low]-1)*sizeof(int));
    109:       PetscFree(ja);
    110:       ja      = ja1;
    111:       PetscMalloc(length*sizeof(PetscScalar),&aa1);
    112:       PetscMemcpy(aa1,aa,(ia[i-low]-1)*sizeof(PetscScalar));
    113:       PetscFree(aa);
    114:       aa      = aa1;
    115:     }
    116:     PetscMemcpy(&ja[pos],cols,ncols*sizeof(int));
    117:     PetscMemcpy(&aa[pos],values,ncols*sizeof(PetscScalar));
    118:     MatRestoreRow(pmat,i,&ncols,&cols,&values);
    119:   }

    121:   /* csr info is for local matrix so initialize im[] locally */
    122:   PetscMalloc(lsize*sizeof(int),&im);
    123:   PetscMemcpy(im,&maptmp[mapptr[rank]-1],lsize*sizeof(int));

    125:   /* 1-based indexing */
    126:   for (i=0; i<ia[lsize]-1; i++) ja[i] = ja[i]+1;

    128:   /* Now copy csr matrix to parms_mat object */
    129:   parms_MatSetValues(parms->A,(int)lsize,im,ia,ja,aa,INSERT);

    131:   /* free memory */
    132:   PetscFree(maptmp);
    133:   PetscFree(mapptr);
    134:   PetscFree(aa);
    135:   PetscFree(ja);
    136:   PetscFree(ia);
    137:   PetscFree(im);

    139:   /* setup parms matrix */
    140:   parms_MatSetup(parms->A);

    142:   /* if created, destroy the previous pARMS pc */
    143:   if (parms->pc) {
    144:     parms_PCFree(&parms->pc);
    145:     parms->pc = NULL;
    146:   }

    148:   /* Now create pARMS preconditioner object based on A */
    149:   parms_PCCreate(&parms->pc,parms->A);

    151:   /* Transfer options from PC to pARMS */
    152:   switch (parms->global) {
    153:   case 0: parms_PCSetType(parms->pc, PCRAS); break;
    154:   case 1: parms_PCSetType(parms->pc, PCSCHUR); break;
    155:   case 2: parms_PCSetType(parms->pc, PCBJ); break;
    156:   }
    157:   switch (parms->local) {
    158:   case 0: parms_PCSetILUType(parms->pc, PCILU0); break;
    159:   case 1: parms_PCSetILUType(parms->pc, PCILUK); break;
    160:   case 2: parms_PCSetILUType(parms->pc, PCILUT); break;
    161:   case 3: parms_PCSetILUType(parms->pc, PCARMS); break;
    162:   }
    163:   parms_PCSetInnerEps(parms->pc, parms->solvetol);
    164:   parms_PCSetNlevels(parms->pc, parms->levels);
    165:   parms_PCSetPermType(parms->pc, parms->nonsymperm ? 1 : 0);
    166:   parms_PCSetBsize(parms->pc, parms->blocksize);
    167:   parms_PCSetTolInd(parms->pc, parms->indtol);
    168:   parms_PCSetInnerKSize(parms->pc, parms->maxdim);
    169:   parms_PCSetInnerMaxits(parms->pc, parms->maxits);
    170:   for (i=0; i<8; i++) meth[i] = parms->meth[i] ? 1 : 0;
    171:   parms_PCSetPermScalOptions(parms->pc, &meth[0], 1);
    172:   parms_PCSetPermScalOptions(parms->pc, &meth[4], 0);
    173:   parms_PCSetFill(parms->pc, parms->lfil);
    174:   parms_PCSetTol(parms->pc, parms->droptol);

    176:   parms_PCSetup(parms->pc);

    178:   /* Allocate two auxiliary vector of length lsize */
    179:   if (parms->lvec0) { PetscFree(parms->lvec0); }
    180:   PetscMalloc(lsize*sizeof(PetscScalar), &parms->lvec0);
    181:   if (parms->lvec1) { PetscFree(parms->lvec1); }
    182:   PetscMalloc(lsize*sizeof(PetscScalar), &parms->lvec1);
    183:   return(0);
    184: }

    188: static PetscErrorCode PCView_PARMS(PC pc,PetscViewer viewer)
    189: {
    191:   PetscBool      iascii;
    192:   PC_PARMS       *parms = (PC_PARMS*)pc->data;
    193:   char           *str;
    194:   double         fill_fact;

    197:   PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);
    198:   if (iascii) {
    199:     parms_PCGetName(parms->pc,&str);
    200:     PetscViewerASCIIPrintf(viewer,"  global preconditioner: %s\n",str);
    201:     parms_PCILUGetName(parms->pc,&str);
    202:     PetscViewerASCIIPrintf(viewer,"  local preconditioner: %s\n",str);
    203:     parms_PCGetRatio(parms->pc,&fill_fact);
    204:     PetscViewerASCIIPrintf(viewer,"  non-zero elements/original non-zero entries: %-4.2f\n",fill_fact);
    205:     PetscViewerASCIIPrintf(viewer,"  Tolerance for local solve: %g\n",parms->solvetol);
    206:     PetscViewerASCIIPrintf(viewer,"  Number of levels: %d\n",parms->levels);
    207:     if (parms->nonsymperm) {
    208:       PetscViewerASCIIPrintf(viewer,"  Using nonsymmetric permutation\n");
    209:     }
    210:     PetscViewerASCIIPrintf(viewer,"  Block size: %d\n",parms->blocksize);
    211:     PetscViewerASCIIPrintf(viewer,"  Tolerance for independent sets: %g\n",parms->indtol);
    212:     PetscViewerASCIIPrintf(viewer,"  Inner Krylov dimension: %d\n",parms->maxdim);
    213:     PetscViewerASCIIPrintf(viewer,"  Maximum number of inner iterations: %d\n",parms->maxits);
    214:     if (parms->meth[0]) {
    215:       PetscViewerASCIIPrintf(viewer,"  Using nonsymmetric permutation for interlevel blocks\n");
    216:     }
    217:     if (parms->meth[1]) {
    218:       PetscViewerASCIIPrintf(viewer,"  Using column permutation for interlevel blocks\n");
    219:     }
    220:     if (parms->meth[2]) {
    221:       PetscViewerASCIIPrintf(viewer,"  Using row scaling for interlevel blocks\n");
    222:     }
    223:     if (parms->meth[3]) {
    224:       PetscViewerASCIIPrintf(viewer,"  Using column scaling for interlevel blocks\n");
    225:     }
    226:     if (parms->meth[4]) {
    227:       PetscViewerASCIIPrintf(viewer,"  Using nonsymmetric permutation for last level blocks\n");
    228:     }
    229:     if (parms->meth[5]) {
    230:       PetscViewerASCIIPrintf(viewer,"  Using column permutation for last level blocks\n");
    231:     }
    232:     if (parms->meth[6]) {
    233:       PetscViewerASCIIPrintf(viewer,"  Using row scaling for last level blocks\n");
    234:     }
    235:     if (parms->meth[7]) {
    236:       PetscViewerASCIIPrintf(viewer,"  Using column scaling for last level blocks\n");
    237:     }
    238:     PetscViewerASCIIPrintf(viewer,"  amount of fill-in for ilut, iluk and arms: %d\n",parms->lfil[0]);
    239:     PetscViewerASCIIPrintf(viewer,"  amount of fill-in for schur: %d\n",parms->lfil[4]);
    240:     PetscViewerASCIIPrintf(viewer,"  amount of fill-in for ILUT L and U: %d\n",parms->lfil[5]);
    241:     PetscViewerASCIIPrintf(viewer,"  drop tolerance for L, U, L^{-1}F and EU^{-1}: %g\n",parms->droptol[0]);
    242:     PetscViewerASCIIPrintf(viewer,"  drop tolerance for schur complement at each level: %g\n",parms->droptol[4]);
    243:     PetscViewerASCIIPrintf(viewer,"  drop tolerance for ILUT in last level schur complement: %g\n",parms->droptol[5]);
    244:   }
    245:   return(0);
    246: }

    250: static PetscErrorCode PCDestroy_PARMS(PC pc)
    251: {
    252:   PC_PARMS       *parms = (PC_PARMS*)pc->data;

    256:   if (parms->map) parms_MapFree(&parms->map);
    257:   if (parms->A) parms_MatFree(&parms->A);
    258:   if (parms->pc) parms_PCFree(&parms->pc);
    259:   if (parms->lvec0) {
    260:     PetscFree(parms->lvec0);
    261:   }
    262:   if (parms->lvec1) {
    263:     PetscFree(parms->lvec1);
    264:   }
    265:   PetscFree(pc->data);

    267:   PetscObjectChangeTypeName((PetscObject)pc,0);
    268:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetGlobal_C",NULL);
    269:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetLocal_C",NULL);
    270:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetSolveTolerances_C",NULL);
    271:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetSolveRestart_C",NULL);
    272:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetNonsymPerm_C",NULL);
    273:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetFill_C",NULL);
    274:   return(0);
    275: }

    279: static PetscErrorCode PCSetFromOptions_PARMS(PC pc)
    280: {
    281:   PC_PARMS          *parms = (PC_PARMS*)pc->data;
    282:   PetscBool         flag;
    283:   PCPARMSGlobalType global;
    284:   PCPARMSLocalType  local;
    285:   PetscErrorCode    ierr;

    288:   PetscOptionsHead("PARMS Options");
    289:   PetscOptionsEnum("-pc_parms_global","Global preconditioner","PCPARMSSetGlobal",PCPARMSGlobalTypes,(PetscEnum)parms->global,(PetscEnum*)&global,&flag);
    290:   if (flag) { PCPARMSSetGlobal(pc,global); }
    291:   PetscOptionsEnum("-pc_parms_local","Local preconditioner","PCPARMSSetLocal",PCPARMSLocalTypes,(PetscEnum)parms->local,(PetscEnum*)&local,&flag);
    292:   if (flag) { PCPARMSSetLocal(pc,local); }
    293:   PetscOptionsReal("-pc_parms_solve_tol","Tolerance for local solve","PCPARMSSetSolveTolerances",parms->solvetol,&parms->solvetol,&flag);
    294:   PetscOptionsInt("-pc_parms_levels","Number of levels","None",parms->levels,&parms->levels,&flag);
    295:   PetscOptionsBool("-pc_parms_nonsymmetric_perm","Use nonsymmetric permutation","PCPARMSSetNonsymPerm",parms->nonsymperm,&parms->nonsymperm,&flag);
    296:   PetscOptionsInt("-pc_parms_blocksize","Block size","None",parms->blocksize,&parms->blocksize,&flag);
    297:   PetscOptionsReal("-pc_parms_ind_tol","Tolerance for independent sets","None",parms->indtol,&parms->indtol,&flag);
    298:   PetscOptionsInt("-pc_parms_max_dim","Inner Krylov dimension","PCPARMSSetSolveRestart",parms->maxdim,&parms->maxdim,&flag);
    299:   PetscOptionsInt("-pc_parms_max_it","Maximum number of inner iterations","PCPARMSSetSolveTolerances",parms->maxits,&parms->maxits,&flag);
    300:   PetscOptionsBool("-pc_parms_inter_nonsymmetric_perm","nonsymmetric permutation for interlevel blocks","None",parms->meth[0],&parms->meth[0],&flag);
    301:   PetscOptionsBool("-pc_parms_inter_column_perm","column permutation for interlevel blocks","None",parms->meth[1],&parms->meth[1],&flag);
    302:   PetscOptionsBool("-pc_parms_inter_row_scaling","row scaling for interlevel blocks","None",parms->meth[2],&parms->meth[2],&flag);
    303:   PetscOptionsBool("-pc_parms_inter_column_scaling","column scaling for interlevel blocks","None",parms->meth[3],&parms->meth[3],&flag);
    304:   PetscOptionsBool("-pc_parms_last_nonsymmetric_perm","nonsymmetric permutation for last level blocks","None",parms->meth[4],&parms->meth[4],&flag);
    305:   PetscOptionsBool("-pc_parms_last_column_perm","column permutation for last level blocks","None",parms->meth[5],&parms->meth[5],&flag);
    306:   PetscOptionsBool("-pc_parms_last_row_scaling","row scaling for last level blocks","None",parms->meth[6],&parms->meth[6],&flag);
    307:   PetscOptionsBool("-pc_parms_last_column_scaling","column scaling for last level blocks","None",parms->meth[7],&parms->meth[7],&flag);
    308:   PetscOptionsInt("-pc_parms_lfil_ilu_arms","amount of fill-in for ilut, iluk and arms","PCPARMSSetFill",parms->lfil[0],&parms->lfil[0],&flag);
    309:   if (flag) parms->lfil[1] = parms->lfil[2] = parms->lfil[3] = parms->lfil[0];
    310:   PetscOptionsInt("-pc_parms_lfil_schur","amount of fill-in for schur","PCPARMSSetFill",parms->lfil[4],&parms->lfil[4],&flag);
    311:   PetscOptionsInt("-pc_parms_lfil_ilut_L_U","amount of fill-in for ILUT L and U","PCPARMSSetFill",parms->lfil[5],&parms->lfil[5],&flag);
    312:   if (flag) parms->lfil[6] = parms->lfil[5];
    313:   PetscOptionsReal("-pc_parms_droptol_factors","drop tolerance for L, U, L^{-1}F and EU^{-1}","None",parms->droptol[0],&parms->droptol[0],&flag);
    314:   PetscOptionsReal("-pc_parms_droptol_schur_compl","drop tolerance for schur complement at each level","None",parms->droptol[4],&parms->droptol[4],&flag);
    315:   if (flag) parms->droptol[1] = parms->droptol[2] = parms->droptol[3] = parms->droptol[0];
    316:   PetscOptionsReal("-pc_parms_droptol_last_schur","drop tolerance for ILUT in last level schur complement","None",parms->droptol[5],&parms->droptol[5],&flag);
    317:   if (flag) parms->droptol[6] = parms->droptol[5];
    318:   PetscOptionsTail();
    319:   return(0);
    320: }

    324: static PetscErrorCode PCApply_PARMS(PC pc,Vec b,Vec x)
    325: {
    326:   PetscErrorCode    ierr;
    327:   PC_PARMS          *parms = (PC_PARMS*)pc->data;
    328:   const PetscScalar *b1;
    329:   PetscScalar       *x1;

    332:   VecGetArrayRead(b,&b1);
    333:   VecGetArray(x,&x1);
    334:   parms_VecPermAux((PetscScalar*)b1,parms->lvec0,parms->map);
    335:   parms_PCApply(parms->pc,parms->lvec0,parms->lvec1);
    336:   parms_VecInvPermAux(parms->lvec1,x1,parms->map);
    337:   VecRestoreArrayRead(b,&b1);
    338:   VecRestoreArray(x,&x1);
    339:   return(0);
    340: }

    344: static PetscErrorCode PCPARMSSetGlobal_PARMS(PC pc,PCPARMSGlobalType type)
    345: {
    346:   PC_PARMS *parms = (PC_PARMS*)pc->data;

    349:   if (type != parms->global) {
    350:     parms->global   = type;
    351:     pc->setupcalled = 0;
    352:   }
    353:   return(0);
    354: }

    358: /*@
    359:    PCPARMSSetGlobal - Sets the global preconditioner to be used in PARMS.

    361:    Collective on PC

    363:    Input Parameters:
    364: +  pc - the preconditioner context
    365: -  type - the global preconditioner type, one of
    366: .vb
    367:      PC_PARMS_GLOBAL_RAS   - Restricted additive Schwarz
    368:      PC_PARMS_GLOBAL_SCHUR - Schur complement
    369:      PC_PARMS_GLOBAL_BJ    - Block Jacobi
    370: .ve

    372:    Options Database Keys:
    373:    -pc_parms_global [ras,schur,bj] - Sets global preconditioner

    375:    Level: intermediate

    377:    Notes:
    378:    See the pARMS function parms_PCSetType for more information.

    380: .seealso: PCPARMS, PCPARMSSetLocal()
    381: @*/
    382: PetscErrorCode PCPARMSSetGlobal(PC pc,PCPARMSGlobalType type)
    383: {

    389:   PetscTryMethod(pc,"PCPARMSSetGlobal_C",(PC,PCPARMSGlobalType),(pc,type));
    390:   return(0);
    391: }

    395: static PetscErrorCode PCPARMSSetLocal_PARMS(PC pc,PCPARMSLocalType type)
    396: {
    397:   PC_PARMS *parms = (PC_PARMS*)pc->data;

    400:   if (type != parms->local) {
    401:     parms->local    = type;
    402:     pc->setupcalled = 0;
    403:   }
    404:   return(0);
    405: }

    409: /*@
    410:    PCPARMSSetLocal - Sets the local preconditioner to be used in PARMS.

    412:    Collective on PC

    414:    Input Parameters:
    415: +  pc - the preconditioner context
    416: -  type - the local preconditioner type, one of
    417: .vb
    418:      PC_PARMS_LOCAL_ILU0   - ILU0 preconditioner
    419:      PC_PARMS_LOCAL_ILUK   - ILU(k) preconditioner
    420:      PC_PARMS_LOCAL_ILUT   - ILUT preconditioner
    421:      PC_PARMS_LOCAL_ARMS   - ARMS preconditioner
    422: .ve

    424:    Options Database Keys:
    425:    -pc_parms_local [ilu0,iluk,ilut,arms] - Sets local preconditioner

    427:    Level: intermediate

    429:    Notes:
    430:    For the ARMS preconditioner, one can use either the symmetric ARMS or the non-symmetric
    431:    variant (ARMS-ddPQ) by setting the permutation type with PCPARMSSetNonsymPerm().

    433:    See the pARMS function parms_PCILUSetType for more information.

    435: .seealso: PCPARMS, PCPARMSSetGlobal(), PCPARMSSetNonsymPerm()

    437: @*/
    438: PetscErrorCode PCPARMSSetLocal(PC pc,PCPARMSLocalType type)
    439: {

    445:   PetscTryMethod(pc,"PCPARMSSetLocal_C",(PC,PCPARMSLocalType),(pc,type));
    446:   return(0);
    447: }

    451: static PetscErrorCode PCPARMSSetSolveTolerances_PARMS(PC pc,PetscReal tol,PetscInt maxits)
    452: {
    453:   PC_PARMS *parms = (PC_PARMS*)pc->data;

    456:   if (tol != parms->solvetol) {
    457:     parms->solvetol = tol;
    458:     pc->setupcalled = 0;
    459:   }
    460:   if (maxits != parms->maxits) {
    461:     parms->maxits   = maxits;
    462:     pc->setupcalled = 0;
    463:   }
    464:   return(0);
    465: }

    469: /*@
    470:    PCPARMSSetSolveTolerances - Sets the convergence tolerance and the maximum iterations for the
    471:    inner GMRES solver, when the Schur global preconditioner is used.

    473:    Collective on PC

    475:    Input Parameters:
    476: +  pc - the preconditioner context
    477: .  tol - the convergence tolerance
    478: -  maxits - the maximum number of iterations to use

    480:    Options Database Keys:
    481: +  -pc_parms_solve_tol - set the tolerance for local solve
    482: -  -pc_parms_max_it - set the maximum number of inner iterations

    484:    Level: intermediate

    486:    Notes:
    487:    See the pARMS functions parms_PCSetInnerEps and parms_PCSetInnerMaxits for more information.

    489: .seealso: PCPARMS, PCPARMSSetSolveRestart()
    490: @*/
    491: PetscErrorCode PCPARMSSetSolveTolerances(PC pc,PetscReal tol,PetscInt maxits)
    492: {

    497:   PetscTryMethod(pc,"PCPARMSSetSolveTolerances_C",(PC,PetscReal,PetscInt),(pc,tol,maxits));
    498:   return(0);
    499: }

    503: static PetscErrorCode PCPARMSSetSolveRestart_PARMS(PC pc,PetscInt restart)
    504: {
    505:   PC_PARMS *parms = (PC_PARMS*)pc->data;

    508:   if (restart != parms->maxdim) {
    509:     parms->maxdim   = restart;
    510:     pc->setupcalled = 0;
    511:   }
    512:   return(0);
    513: }

    517: /*@
    518:    PCPARMSSetSolveRestart - Sets the number of iterations at which the
    519:    inner GMRES solver restarts.

    521:    Collective on PC

    523:    Input Parameters:
    524: +  pc - the preconditioner context
    525: -  restart - maximum dimension of the Krylov subspace

    527:    Options Database Keys:
    528: .  -pc_parms_max_dim - sets the inner Krylov dimension

    530:    Level: intermediate

    532:    Notes:
    533:    See the pARMS function parms_PCSetInnerKSize for more information.

    535: .seealso: PCPARMS, PCPARMSSetSolveTolerances()
    536: @*/
    537: PetscErrorCode PCPARMSSetSolveRestart(PC pc,PetscInt restart)
    538: {

    543:   PetscTryMethod(pc,"PCPARMSSetSolveRestart_C",(PC,PetscInt),(pc,restart));
    544:   return(0);
    545: }

    549: static PetscErrorCode PCPARMSSetNonsymPerm_PARMS(PC pc,PetscBool nonsym)
    550: {
    551:   PC_PARMS *parms = (PC_PARMS*)pc->data;

    554:   if ((nonsym && !parms->nonsymperm) || (!nonsym && parms->nonsymperm)) {
    555:     parms->nonsymperm = nonsym;
    556:     pc->setupcalled   = 0;
    557:   }
    558:   return(0);
    559: }

    563: /*@
    564:    PCPARMSSetNonsymPerm - Sets the type of permutation for the ARMS preconditioner: the standard
    565:    symmetric ARMS or the non-symmetric ARMS (ARMS-ddPQ).

    567:    Collective on PC

    569:    Input Parameters:
    570: +  pc - the preconditioner context
    571: -  nonsym - PETSC_TRUE indicates the non-symmetric ARMS is used;
    572:             PETSC_FALSE indicates the symmetric ARMS is used

    574:    Options Database Keys:
    575: .  -pc_parms_nonsymmetric_perm - sets the use of nonsymmetric permutation

    577:    Level: intermediate

    579:    Notes:
    580:    See the pARMS function parms_PCSetPermType for more information.

    582: .seealso: PCPARMS
    583: @*/
    584: PetscErrorCode PCPARMSSetNonsymPerm(PC pc,PetscBool nonsym)
    585: {

    590:   PetscTryMethod(pc,"PCPARMSSetNonsymPerm_C",(PC,PetscBool),(pc,nonsym));
    591:   return(0);
    592: }

    596: static PetscErrorCode PCPARMSSetFill_PARMS(PC pc,PetscInt lfil0,PetscInt lfil1,PetscInt lfil2)
    597: {
    598:   PC_PARMS *parms = (PC_PARMS*)pc->data;

    601:   if (lfil0 != parms->lfil[0] || lfil0 != parms->lfil[1] || lfil0 != parms->lfil[2] || lfil0 != parms->lfil[3]) {
    602:     parms->lfil[1]  = parms->lfil[2] = parms->lfil[3] = parms->lfil[0] = lfil0;
    603:     pc->setupcalled = 0;
    604:   }
    605:   if (lfil1 != parms->lfil[4]) {
    606:     parms->lfil[4]  = lfil1;
    607:     pc->setupcalled = 0;
    608:   }
    609:   if (lfil2 != parms->lfil[5] || lfil2 != parms->lfil[6]) {
    610:     parms->lfil[5]  = parms->lfil[6] = lfil2;
    611:     pc->setupcalled = 0;
    612:   }
    613:   return(0);
    614: }

    618: /*@
    619:    PCPARMSSetFill - Sets the fill-in parameters for ILUT, ILUK and ARMS preconditioners.
    620:    Consider the original matrix A = [B F; E C] and the approximate version
    621:    M = [LB 0; E/UB I]*[UB LB\F; 0 S].

    623:    Collective on PC

    625:    Input Parameters:
    626: +  pc - the preconditioner context
    627: .  fil0 - the level of fill-in kept in LB, UB, E/UB and LB\F
    628: .  fil1 - the level of fill-in kept in S
    629: -  fil2 - the level of fill-in kept in the L and U parts of the LU factorization of S

    631:    Options Database Keys:
    632: +  -pc_parms_lfil_ilu_arms - set the amount of fill-in for ilut, iluk and arms
    633: .  -pc_parms_lfil_schur - set the amount of fill-in for schur
    634: -  -pc_parms_lfil_ilut_L_U - set the amount of fill-in for ILUT L and U

    636:    Level: intermediate

    638:    Notes:
    639:    See the pARMS function parms_PCSetFill for more information.

    641: .seealso: PCPARMS
    642: @*/
    643: PetscErrorCode PCPARMSSetFill(PC pc,PetscInt lfil0,PetscInt lfil1,PetscInt lfil2)
    644: {

    649:   PetscTryMethod(pc,"PCPARMSSetFill_C",(PC,PetscInt,PetscInt,PetscInt),(pc,lfil0,lfil1,lfil2));
    650:   return(0);
    651: }

    653: /*MC
    654:    PCPARMS - Allows the use of the parallel Algebraic Recursive Multilevel Solvers
    655:       available in the package pARMS

    657:    Options Database Keys:
    658: +  -pc_parms_global - one of ras, schur, bj
    659: .  -pc_parms_local - one of ilu0, iluk, ilut, arms
    660: .  -pc_parms_solve_tol - set the tolerance for local solve
    661: .  -pc_parms_levels - set the number of levels
    662: .  -pc_parms_nonsymmetric_perm - set the use of nonsymmetric permutation
    663: .  -pc_parms_blocksize - set the block size
    664: .  -pc_parms_ind_tol - set the tolerance for independent sets
    665: .  -pc_parms_max_dim - set the inner krylov dimension
    666: .  -pc_parms_max_it - set the maximum number of inner iterations
    667: .  -pc_parms_inter_nonsymmetric_perm - set the use of nonsymmetric permutation for interlevel blocks
    668: .  -pc_parms_inter_column_perm - set the use of column permutation for interlevel blocks
    669: .  -pc_parms_inter_row_scaling - set the use of row scaling for interlevel blocks
    670: .  -pc_parms_inter_column_scaling - set the use of column scaling for interlevel blocks
    671: .  -pc_parms_last_nonsymmetric_perm - set the use of nonsymmetric permutation for last level blocks
    672: .  -pc_parms_last_column_perm - set the use of column permutation for last level blocks
    673: .  -pc_parms_last_row_scaling - set the use of row scaling for last level blocks
    674: .  -pc_parms_last_column_scaling - set the use of column scaling for last level blocks
    675: .  -pc_parms_lfil_ilu_arms - set the amount of fill-in for ilut, iluk and arms
    676: .  -pc_parms_lfil_schur - set the amount of fill-in for schur
    677: .  -pc_parms_lfil_ilut_L_U - set the amount of fill-in for ILUT L and U
    678: .  -pc_parms_droptol_factors - set the drop tolerance for L, U, L^{-1}F and EU^{-1}
    679: .  -pc_parms_droptol_schur_compl - set the drop tolerance for schur complement at each level
    680: -  -pc_parms_droptol_last_schur - set the drop tolerance for ILUT in last level schur complement

    682:    IMPORTANT:
    683:    Unless configured appropriately, this preconditioner performs an inexact solve
    684:    as part of the preconditioner application. Therefore, it must be used in combination
    685:    with flexible variants of iterative solvers, such as KSPFGMRES or KSPCGR.

    687:    Level: intermediate

    689: .seealso:  PCCreate(), PCSetType(), PCType (for list of available types), PC
    690: M*/

    694: PETSC_EXTERN PetscErrorCode PCCreate_PARMS(PC pc)
    695: {
    696:   PC_PARMS       *parms;

    700:   PetscNewLog(pc,PC_PARMS,&parms);

    702:   parms->map        = 0;
    703:   parms->A          = 0;
    704:   parms->pc         = 0;
    705:   parms->global     = PC_PARMS_GLOBAL_RAS;
    706:   parms->local      = PC_PARMS_LOCAL_ARMS;
    707:   parms->levels     = 10;
    708:   parms->nonsymperm = PETSC_TRUE;
    709:   parms->blocksize  = 250;
    710:   parms->maxdim     = 0;
    711:   parms->maxits     = 0;
    712:   parms->meth[0]    = PETSC_FALSE;
    713:   parms->meth[1]    = PETSC_FALSE;
    714:   parms->meth[2]    = PETSC_FALSE;
    715:   parms->meth[3]    = PETSC_FALSE;
    716:   parms->meth[4]    = PETSC_FALSE;
    717:   parms->meth[5]    = PETSC_FALSE;
    718:   parms->meth[6]    = PETSC_FALSE;
    719:   parms->meth[7]    = PETSC_FALSE;
    720:   parms->solvetol   = 0.01;
    721:   parms->indtol     = 0.4;
    722:   parms->lfil[0]    = parms->lfil[1] = parms->lfil[2] = parms->lfil[3] = 20;
    723:   parms->lfil[4]    = parms->lfil[5] = parms->lfil[6] = 20;
    724:   parms->droptol[0] = parms->droptol[1] = parms->droptol[2] = parms->droptol[3] = 0.00001;
    725:   parms->droptol[4] = 0.001;
    726:   parms->droptol[5] = parms->droptol[6] = 0.001;

    728:   pc->data                = parms;
    729:   pc->ops->destroy        = PCDestroy_PARMS;
    730:   pc->ops->setfromoptions = PCSetFromOptions_PARMS;
    731:   pc->ops->setup          = PCSetUp_PARMS;
    732:   pc->ops->apply          = PCApply_PARMS;
    733:   pc->ops->view           = PCView_PARMS;

    735:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetGlobal_C",PCPARMSSetGlobal_PARMS);
    736:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetLocal_C",PCPARMSSetLocal_PARMS);
    737:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetSolveTolerances_C",PCPARMSSetSolveTolerances_PARMS);
    738:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetSolveRestart_C",PCPARMSSetSolveRestart_PARMS);
    739:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetNonsymPerm_C",PCPARMSSetNonsymPerm_PARMS);
    740:   PetscObjectComposeFunction((PetscObject)pc,"PCPARMSSetFill_C",PCPARMSSetFill_PARMS);
    741:   return(0);
    742: }