Actual source code: itcl.c
petsc-3.15.0 2021-03-30
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      2: /*
      3:     Code for setting KSP options from the options database.
      4: */

      6: #include <petsc/private/kspimpl.h>
      7: #include <petscdraw.h>

      9: /*@C
     10:    KSPSetOptionsPrefix - Sets the prefix used for searching for all
     11:    KSP options in the database.

     13:    Logically Collective on ksp

     15:    Input Parameters:
     16: +  ksp - the Krylov context
     17: -  prefix - the prefix string to prepend to all KSP option requests

     19:    Notes:
     20:    A hyphen (-) must NOT be given at the beginning of the prefix name.
     21:    The first character of all runtime options is AUTOMATICALLY the
     22:    hyphen.

     24:    For example, to distinguish between the runtime options for two
     25:    different KSP contexts, one could call
     26: .vb
     27:       KSPSetOptionsPrefix(ksp1,"sys1_")
     28:       KSPSetOptionsPrefix(ksp2,"sys2_")
     29: .ve

     31:    This would enable use of different options for each system, such as
     32: .vb
     33:       -sys1_ksp_type gmres -sys1_ksp_rtol 1.e-3
     34:       -sys2_ksp_type bcgs  -sys2_ksp_rtol 1.e-4
     35: .ve

     37:    Level: advanced

     39: .seealso: KSPAppendOptionsPrefix(), KSPGetOptionsPrefix()
     40: @*/
     41: PetscErrorCode  KSPSetOptionsPrefix(KSP ksp,const char prefix[])
     42: {

     47:   if (!ksp->pc) {KSPGetPC(ksp,&ksp->pc);}
     48:   PCSetOptionsPrefix(ksp->pc,prefix);
     49:   PetscObjectSetOptionsPrefix((PetscObject)ksp,prefix);
     50:   return(0);
     51: }

     53: /*@C
     54:    KSPAppendOptionsPrefix - Appends to the prefix used for searching for all
     55:    KSP options in the database.

     57:    Logically Collective on ksp

     59:    Input Parameters:
     60: +  ksp - the Krylov context
     61: -  prefix - the prefix string to prepend to all KSP option requests

     63:    Notes:
     64:    A hyphen (-) must NOT be given at the beginning of the prefix name.
     65:    The first character of all runtime options is AUTOMATICALLY the hyphen.

     67:    Level: advanced

     69: .seealso: KSPSetOptionsPrefix(), KSPGetOptionsPrefix()
     70: @*/
     71: PetscErrorCode  KSPAppendOptionsPrefix(KSP ksp,const char prefix[])
     72: {

     77:   if (!ksp->pc) {KSPGetPC(ksp,&ksp->pc);}
     78:   PCAppendOptionsPrefix(ksp->pc,prefix);
     79:   PetscObjectAppendOptionsPrefix((PetscObject)ksp,prefix);
     80:   return(0);
     81: }

     83: /*@
     84:    KSPSetUseFischerGuess - Use the Paul Fischer algorithm

     86:    Logically Collective on ksp

     88:    Input Parameters:
     89: +  ksp - the Krylov context
     90: .  model - use model 1, model 2 or any other number to turn it off
     91: -  size - size of subspace used to generate initial guess

     93:     Options Database:
     94: .   -ksp_fischer_guess <model,size> - uses the Fischer initial guess generator for repeated linear solves

     96:    Level: advanced

     98: .seealso: KSPSetOptionsPrefix(), KSPAppendOptionsPrefix(), KSPSetUseFischerGuess(), KSPSetGuess(), KSPGetGuess()
     99: @*/
    100: PetscErrorCode  KSPSetUseFischerGuess(KSP ksp,PetscInt model,PetscInt size)
    101: {
    102:   KSPGuess       guess;

    109:   KSPGetGuess(ksp,&guess);
    110:   KSPGuessSetType(guess,KSPGUESSFISCHER);
    111:   KSPGuessFischerSetModel(guess,model,size);
    112:   return(0);
    113: }

    115: /*@
    116:    KSPSetGuess - Set the initial guess object

    118:    Logically Collective on ksp

    120:    Input Parameters:
    121: +  ksp - the Krylov context
    122: -  guess - the object created with KSPGuessCreate()

    124:    Level: advanced

    126:    Notes:
    127:     this allows a single KSP to be used with several different initial guess generators (likely for different linear
    128:           solvers, see KSPSetPC()).

    130:           This increases the reference count of the guess object, you must destroy the object with KSPGuessDestroy()
    131:           before the end of the program.

    133: .seealso: KSPSetOptionsPrefix(), KSPAppendOptionsPrefix(), KSPSetUseFischerGuess(), KSPGetGuess()
    134: @*/
    135: PetscErrorCode  KSPSetGuess(KSP ksp,KSPGuess guess)
    136: {

    142:   PetscObjectReference((PetscObject)guess);
    143:   KSPGuessDestroy(&ksp->guess);
    144:   ksp->guess = guess;
    145:   ksp->guess->ksp = ksp;
    146:   return(0);
    147: }

    149: /*@
    150:    KSPGetGuess - Gets the initial guess generator for the KSP.

    152:    Not Collective

    154:    Input Parameters:
    155: .  ksp - the Krylov context

    157:    Output Parameters:
    158: .   guess - the object

    160:    Level: developer

    162: .seealso: KSPSetOptionsPrefix(), KSPAppendOptionsPrefix(), KSPSetUseFischerGuess(), KSPSetGuess()
    163: @*/
    164: PetscErrorCode  KSPGetGuess(KSP ksp,KSPGuess *guess)
    165: {

    171:   if (!ksp->guess) {
    172:     const char* prefix;

    174:     KSPGuessCreate(PetscObjectComm((PetscObject)ksp),&ksp->guess);
    175:     PetscObjectGetOptionsPrefix((PetscObject)ksp,&prefix);
    176:     if (prefix) {
    177:       PetscObjectSetOptionsPrefix((PetscObject)ksp->guess,prefix);
    178:     }
    179:     ksp->guess->ksp = ksp;
    180:   }
    181:   *guess = ksp->guess;
    182:   return(0);
    183: }

    185: /*@C
    186:    KSPGetOptionsPrefix - Gets the prefix used for searching for all
    187:    KSP options in the database.

    189:    Not Collective

    191:    Input Parameters:
    192: .  ksp - the Krylov context

    194:    Output Parameters:
    195: .  prefix - pointer to the prefix string used is returned

    197:    Notes:
    198:     On the fortran side, the user should pass in a string 'prefix' of
    199:    sufficient length to hold the prefix.

    201:    Level: advanced

    203: .seealso: KSPSetOptionsPrefix(), KSPAppendOptionsPrefix()
    204: @*/
    205: PetscErrorCode  KSPGetOptionsPrefix(KSP ksp,const char *prefix[])
    206: {

    211:   PetscObjectGetOptionsPrefix((PetscObject)ksp,prefix);
    212:   return(0);
    213: }

    215: static PetscErrorCode PetscViewerAndFormatCreate_Internal(PetscViewer viewer, PetscViewerFormat format, void *ctx, PetscViewerAndFormat **vf)
    216: {

    220:   PetscViewerAndFormatCreate(viewer, format, vf);
    221:   (*vf)->data = ctx;
    222:   return(0);
    223: }

    225: /*@C
    226:    KSPMonitorSetFromOptions - Sets a monitor function and viewer appropriate for the type indicated by the user

    228:    Collective on ksp

    230:    Input Parameters:
    231: +  ksp  - KSP object you wish to monitor
    232: .  opt  - the command line option for this monitor
    233: .  name - the monitor type one is seeking
    234: -  ctx  - An optional user context for the monitor, or NULL

    236:    Level: developer

    238: .seealso: PetscOptionsGetViewer(), PetscOptionsGetReal(), PetscOptionsHasName(), PetscOptionsGetString(),
    239:           PetscOptionsGetIntArray(), PetscOptionsGetRealArray(), PetscOptionsBool()
    240:           PetscOptionsInt(), PetscOptionsString(), PetscOptionsReal(), PetscOptionsBool(),
    241:           PetscOptionsName(), PetscOptionsBegin(), PetscOptionsEnd(), PetscOptionsHead(),
    242:           PetscOptionsStringArray(),PetscOptionsRealArray(), PetscOptionsScalar(),
    243:           PetscOptionsBoolGroupBegin(), PetscOptionsBoolGroup(), PetscOptionsBoolGroupEnd(),
    244:           PetscOptionsFList(), PetscOptionsEList()
    245: @*/
    246: PetscErrorCode KSPMonitorSetFromOptions(KSP ksp, const char opt[], const char name[], void *ctx)
    247: {
    248:   PetscErrorCode      (*mfunc)(KSP, PetscInt, PetscReal, void *);
    249:   PetscErrorCode      (*cfunc)(PetscViewer, PetscViewerFormat, void *, PetscViewerAndFormat **);
    250:   PetscErrorCode      (*dfunc)(PetscViewerAndFormat **);
    251:   PetscViewerAndFormat *vf;
    252:   PetscViewer           viewer;
    253:   PetscViewerFormat     format;
    254:   PetscViewerType       vtype;
    255:   char                  key[PETSC_MAX_PATH_LEN];
    256:   PetscBool             all, flg;
    257:   const char           *prefix = NULL;
    258:   PetscErrorCode        ierr;

    261:   PetscStrcmp(opt, "-all_ksp_monitor", &all);
    262:   if (!all) {PetscObjectGetOptionsPrefix((PetscObject) ksp, &prefix);}
    263:   PetscOptionsGetViewer(PetscObjectComm((PetscObject) ksp), ((PetscObject) ksp)->options, prefix, opt, &viewer, &format, &flg);
    264:   if (!flg) return(0);

    266:   PetscViewerGetType(viewer, &vtype);
    267:   KSPMonitorMakeKey_Internal(name, vtype, format, key);
    268:   PetscFunctionListFind(KSPMonitorList, key, &mfunc);
    269:   PetscFunctionListFind(KSPMonitorCreateList, key, &cfunc);
    270:   PetscFunctionListFind(KSPMonitorDestroyList, key, &dfunc);
    271:   if (!cfunc) cfunc = PetscViewerAndFormatCreate_Internal;
    272:   if (!dfunc) dfunc = PetscViewerAndFormatDestroy;

    274:   (*cfunc)(viewer, format, ctx, &vf);
    275:   PetscObjectDereference((PetscObject) viewer);
    276:   KSPMonitorSet(ksp, mfunc, vf, (PetscErrorCode (*)(void **)) dfunc);
    277:   return(0);
    278: }

    280: /*@
    281:    KSPSetFromOptions - Sets KSP options from the options database.
    282:    This routine must be called before KSPSetUp() if the user is to be
    283:    allowed to set the Krylov type.

    285:    Collective on ksp

    287:    Input Parameters:
    288: .  ksp - the Krylov space context

    290:    Options Database Keys:
    291: +   -ksp_max_it - maximum number of linear iterations
    292: .   -ksp_rtol rtol - relative tolerance used in default determination of convergence, i.e.
    293:                 if residual norm decreases by this factor than convergence is declared
    294: .   -ksp_atol abstol - absolute tolerance used in default convergence test, i.e. if residual
    295:                 norm is less than this then convergence is declared
    296: .   -ksp_divtol tol - if residual norm increases by this factor than divergence is declared
    297: .   -ksp_converged_use_initial_residual_norm - see KSPConvergedDefaultSetUIRNorm()
    298: .   -ksp_converged_use_min_initial_residual_norm - see KSPConvergedDefaultSetUMIRNorm()
    299: .   -ksp_converged_maxits - see KSPConvergedDefaultSetConvergedMaxits()
    300: .   -ksp_norm_type - none - skip norms used in convergence tests (useful only when not using
    301:                        convergence test (say you always want to run with 5 iterations) to
    302:                        save on communication overhead
    303:                     preconditioned - default for left preconditioning
    304:                     unpreconditioned - see KSPSetNormType()
    305:                     natural - see KSPSetNormType()
    306: .   -ksp_check_norm_iteration it - do not compute residual norm until iteration number it (does compute at 0th iteration)
    307:        works only for PCBCGS, PCIBCGS and and PCCG
    308: .   -ksp_lag_norm - compute the norm of the residual for the ith iteration on the i+1 iteration; this means that one can use
    309:        the norm of the residual for convergence test WITHOUT an extra MPI_Allreduce() limiting global synchronizations.
    310:        This will require 1 more iteration of the solver than usual.
    311: .   -ksp_guess_type - Type of initial guess generator for repeated linear solves
    312: .   -ksp_fischer_guess <model,size> - uses the Fischer initial guess generator for repeated linear solves
    313: .   -ksp_constant_null_space - assume the operator (matrix) has the constant vector in its null space
    314: .   -ksp_test_null_space - tests the null space set with MatSetNullSpace() to see if it truly is a null space
    315: .   -ksp_knoll - compute initial guess by applying the preconditioner to the right hand side
    316: .   -ksp_monitor_cancel - cancel all previous convergene monitor routines set
    317: .   -ksp_monitor - print residual norm at each iteration
    318: .   -ksp_monitor draw::draw_lg - plot residual norm at each iteration
    319: .   -ksp_monitor_true_residual - print true residual norm at each iteration
    320: .   -all_ksp_monitor <optional filename> - print residual norm at each iteration for ALL KSP solves, regardless of their prefix. This is
    321:                                            useful for PCFIELDSPLIT, PCMG, etc that have inner solvers and you wish to track the convergence of all the solvers
    322: .   -ksp_monitor_solution [ascii binary or draw][:filename][:format option] - plot solution at each iteration
    323: .   -ksp_monitor_singular_value - monitor extreme singular values at each iteration
    324: .   -ksp_converged_reason - view the convergence state at the end of the solve
    325: .   -ksp_use_explicittranspose - transpose the system explicitly in KSPSolveTranspose
    326: -   -ksp_converged_rate - view the convergence rate at the end of the solve

    328:    Notes:
    329:    To see all options, run your program with the -help option
    330:    or consult Users-Manual: ch_ksp

    332:    Level: beginner

    334: .seealso: KSPSetOptionsPrefix(), KSPResetFromOptions(), KSPSetUseFischerGuess()

    336: @*/
    337: PetscErrorCode  KSPSetFromOptions(KSP ksp)
    338: {
    339:   const char     *convtests[]={"default","skip","lsqr"},*prefix;
    340:   char           type[256],guesstype[256],monfilename[PETSC_MAX_PATH_LEN];
    341:   PetscBool      flg,flag,reuse,set;
    342:   PetscInt       indx,model[2]={0,0},nmax;
    343:   KSPNormType    normtype;
    344:   PCSide         pcside;
    345:   void           *ctx;
    346:   MPI_Comm       comm;

    351:   PetscObjectGetComm((PetscObject) ksp, &comm);
    352:   PetscObjectGetOptionsPrefix((PetscObject) ksp, &prefix);
    353:   if (!ksp->skippcsetfromoptions) {
    354:     if (!ksp->pc) {KSPGetPC(ksp,&ksp->pc);}
    355:     PCSetFromOptions(ksp->pc);
    356:   }

    358:   KSPRegisterAll();
    359:   PetscObjectOptionsBegin((PetscObject)ksp);
    360:   PetscOptionsFList("-ksp_type","Krylov method","KSPSetType",KSPList,(char*)(((PetscObject)ksp)->type_name ? ((PetscObject)ksp)->type_name : KSPGMRES),type,256,&flg);
    361:   if (flg) {
    362:     KSPSetType(ksp,type);
    363:   }
    364:   /*
    365:     Set the type if it was never set.
    366:   */
    367:   if (!((PetscObject)ksp)->type_name) {
    368:     KSPSetType(ksp,KSPGMRES);
    369:   }

    371:   KSPResetViewers(ksp);

    373:   /* Cancels all monitors hardwired into code before call to KSPSetFromOptions() */
    374:   PetscOptionsBool("-ksp_monitor_cancel","Remove any hardwired monitor routines","KSPMonitorCancel",PETSC_FALSE,&flg,&set);
    375:   if (set && flg) {KSPMonitorCancel(ksp);}
    376:   KSPMonitorSetFromOptions(ksp, "-ksp_monitor", "preconditioned_residual", NULL);
    377:   KSPMonitorSetFromOptions(ksp, "-ksp_monitor_short", "preconditioned_residual_short", NULL);
    378:   KSPMonitorSetFromOptions(ksp, "-all_ksp_monitor", "preconditioned_residual", NULL);
    379:   KSPMonitorSetFromOptions(ksp, "-ksp_monitor_range", "preconditioned_residual_range", NULL);
    380:   KSPMonitorSetFromOptions(ksp, "-ksp_monitor_true_residual", "true_residual", NULL);
    381:   KSPMonitorSetFromOptions(ksp, "-ksp_monitor_max", "true_residual_max", NULL);
    382:   KSPMonitorSetFromOptions(ksp, "-ksp_monitor_solution", "solution", NULL);
    383:   KSPMonitorSetFromOptions(ksp, "-ksp_monitor_singular_value", "singular_value", ksp);
    384:   KSPMonitorSetFromOptions(ksp, "-ksp_monitor_error", "error", ksp);
    385:   PetscOptionsBool("-ksp_monitor_pause_final", "Pauses all draw monitors at the final iterate", "KSPMonitorPauseFinal_Internal", PETSC_FALSE, &ksp->pauseFinal, NULL);

    387:   PetscObjectTypeCompare((PetscObject)ksp,KSPPREONLY,&flg);
    388:   if (flg) {
    389:     KSPGetReusePreconditioner(ksp,&reuse);
    390:     PetscOptionsBool("-ksp_reuse_preconditioner","Use initial preconditioner and don't ever compute a new one","KSPReusePreconditioner",reuse,&reuse,NULL);
    391:     KSPSetReusePreconditioner(ksp,reuse);
    392:     PetscOptionsBool("-ksp_error_if_not_converged","Generate error if solver does not converge","KSPSetErrorIfNotConverged",ksp->errorifnotconverged,&ksp->errorifnotconverged,NULL);
    393:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view",&ksp->viewer, &ksp->format,&ksp->view);
    394:     flg = PETSC_FALSE;
    395:     PetscOptionsBool("-ksp_converged_reason_view_cancel","Cancel all the converged reason view functions set using KSPConvergedReasonViewSet","KSPConvergedReasonViewCancel",PETSC_FALSE,&flg,&set);
    396:     if (set && flg) {
    397:       KSPConvergedReasonViewCancel(ksp);
    398:     }
    399:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_mat",&ksp->viewerMat,&ksp->formatMat,&ksp->viewMat);
    400:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_pmat",&ksp->viewerPMat,&ksp->formatPMat,&ksp->viewPMat);
    401:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_rhs",&ksp->viewerRhs,&ksp->formatRhs,&ksp->viewRhs);
    402:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_solution",&ksp->viewerSol,&ksp->formatSol,&ksp->viewSol);
    403:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_mat_explicit",&ksp->viewerMatExp,&ksp->formatMatExp,&ksp->viewMatExp);
    404:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_final_residual",&ksp->viewerFinalRes,&ksp->formatFinalRes,&ksp->viewFinalRes);
    405:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_preconditioned_operator_explicit",&ksp->viewerPOpExp,&ksp->formatPOpExp,&ksp->viewPOpExp);
    406:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_diagonal_scale",&ksp->viewerDScale,&ksp->formatDScale,&ksp->viewDScale);

    408:     KSPGetDiagonalScale(ksp,&flag);
    409:     PetscOptionsBool("-ksp_diagonal_scale","Diagonal scale matrix before building preconditioner","KSPSetDiagonalScale",flag,&flag,&flg);
    410:     if (flg) {
    411:       KSPSetDiagonalScale(ksp,flag);
    412:     }
    413:     KSPGetDiagonalScaleFix(ksp,&flag);
    414:     PetscOptionsBool("-ksp_diagonal_scale_fix","Fix diagonally scaled matrix after solve","KSPSetDiagonalScaleFix",flag,&flag,&flg);
    415:     if (flg) {
    416:       KSPSetDiagonalScaleFix(ksp,flag);
    417:     }
    418:     nmax = ksp->nmax;
    419:     PetscOptionsDeprecated("-ksp_matsolve_block_size","-ksp_matsolve_batch_size","3.15",NULL);
    420:     PetscOptionsInt("-ksp_matsolve_batch_size", "Maximum number of columns treated simultaneously", "KSPSetMatSolveBatchSize", nmax, &nmax, &flg);
    421:     if (flg) {
    422:       KSPSetMatSolveBatchSize(ksp, nmax);
    423:     }
    424:     goto skipoptions;
    425:   }

    427:   PetscOptionsInt("-ksp_max_it","Maximum number of iterations","KSPSetTolerances",ksp->max_it,&ksp->max_it,NULL);
    428:   PetscOptionsReal("-ksp_rtol","Relative decrease in residual norm","KSPSetTolerances",ksp->rtol,&ksp->rtol,NULL);
    429:   PetscOptionsReal("-ksp_atol","Absolute value of residual norm","KSPSetTolerances",ksp->abstol,&ksp->abstol,NULL);
    430:   PetscOptionsReal("-ksp_divtol","Residual norm increase cause divergence","KSPSetTolerances",ksp->divtol,&ksp->divtol,NULL);

    432:   PetscOptionsBool("-ksp_converged_use_initial_residual_norm","Use initial residual norm for computing relative convergence","KSPConvergedDefaultSetUIRNorm",PETSC_FALSE,&flag,&set);
    433:   if (set && flag) {KSPConvergedDefaultSetUIRNorm(ksp);}
    434:   PetscOptionsBool("-ksp_converged_use_min_initial_residual_norm","Use minimum of initial residual norm and b for computing relative convergence","KSPConvergedDefaultSetUMIRNorm",PETSC_FALSE,&flag,&set);
    435:   if (set && flag) {KSPConvergedDefaultSetUMIRNorm(ksp);}
    436:   PetscOptionsBool("-ksp_converged_maxits","Declare convergence if the maximum number of iterations is reached","KSPConvergedDefaultSetConvergedMaxits",PETSC_FALSE,&flag,&set);
    437:   if (set) {KSPConvergedDefaultSetConvergedMaxits(ksp,flag);}
    438:   PetscOptionsBool("-ksp_initial_guess_nonzero","Use the contents of the solution vector for initial guess","KSPSetInitialNonzero",ksp->guess_zero ? PETSC_FALSE : PETSC_TRUE,&flag,&flg);
    439:   if (flg) {
    440:     KSPSetInitialGuessNonzero(ksp,flag);
    441:   }
    442:   KSPGetReusePreconditioner(ksp,&reuse);
    443:   PetscOptionsBool("-ksp_reuse_preconditioner","Use initial preconditioner and don't ever compute a new one","KSPReusePreconditioner",reuse,&reuse,NULL);
    444:   KSPSetReusePreconditioner(ksp,reuse);

    446:   PetscOptionsBool("-ksp_knoll","Use preconditioner applied to b for initial guess","KSPSetInitialGuessKnoll",ksp->guess_knoll,&ksp->guess_knoll,NULL);
    447:   PetscOptionsBool("-ksp_error_if_not_converged","Generate error if solver does not converge","KSPSetErrorIfNotConverged",ksp->errorifnotconverged,&ksp->errorifnotconverged,NULL);
    448:   PetscOptionsFList("-ksp_guess_type","Initial guess in Krylov method",NULL,KSPGuessList,NULL,guesstype,256,&flg);
    449:   if (flg) {
    450:     KSPGetGuess(ksp,&ksp->guess);
    451:     KSPGuessSetType(ksp->guess,guesstype);
    452:     KSPGuessSetFromOptions(ksp->guess);
    453:   } else { /* old option for KSP */
    454:     nmax = 2;
    455:     PetscOptionsIntArray("-ksp_fischer_guess","Use Paul Fischer's algorithm for initial guess","KSPSetUseFischerGuess",model,&nmax,&flag);
    456:     if (flag) {
    457:       if (nmax != 2) SETERRQ(comm,PETSC_ERR_ARG_OUTOFRANGE,"Must pass in model,size as arguments");
    458:       KSPSetUseFischerGuess(ksp,model[0],model[1]);
    459:     }
    460:   }

    462:   PetscOptionsEList("-ksp_convergence_test","Convergence test","KSPSetConvergenceTest",convtests,3,"default",&indx,&flg);
    463:   if (flg) {
    464:     switch (indx) {
    465:     case 0:
    466:       KSPConvergedDefaultCreate(&ctx);
    467:       KSPSetConvergenceTest(ksp,KSPConvergedDefault,ctx,KSPConvergedDefaultDestroy);
    468:       break;
    469:     case 1:
    470:       KSPSetConvergenceTest(ksp,KSPConvergedSkip,NULL,NULL);
    471:       break;
    472:     case 2:
    473:       KSPConvergedDefaultCreate(&ctx);
    474:       KSPSetConvergenceTest(ksp,KSPLSQRConvergedDefault,ctx,KSPConvergedDefaultDestroy);
    475:       break;
    476:     }
    477:   }

    479:   KSPSetUpNorms_Private(ksp,PETSC_FALSE,&normtype,NULL);
    480:   PetscOptionsEnum("-ksp_norm_type","KSP Norm type","KSPSetNormType",KSPNormTypes,(PetscEnum)normtype,(PetscEnum*)&normtype,&flg);
    481:   if (flg) { KSPSetNormType(ksp,normtype); }

    483:   PetscOptionsInt("-ksp_check_norm_iteration","First iteration to compute residual norm","KSPSetCheckNormIteration",ksp->chknorm,&ksp->chknorm,NULL);

    485:   PetscOptionsBool("-ksp_lag_norm","Lag the calculation of the residual norm","KSPSetLagNorm",ksp->lagnorm,&flag,&flg);
    486:   if (flg) {
    487:     KSPSetLagNorm(ksp,flag);
    488:   }

    490:   KSPGetDiagonalScale(ksp,&flag);
    491:   PetscOptionsBool("-ksp_diagonal_scale","Diagonal scale matrix before building preconditioner","KSPSetDiagonalScale",flag,&flag,&flg);
    492:   if (flg) {
    493:     KSPSetDiagonalScale(ksp,flag);
    494:   }
    495:   KSPGetDiagonalScaleFix(ksp,&flag);
    496:   PetscOptionsBool("-ksp_diagonal_scale_fix","Fix diagonally scaled matrix after solve","KSPSetDiagonalScaleFix",flag,&flag,&flg);
    497:   if (flg) {
    498:     KSPSetDiagonalScaleFix(ksp,flag);
    499:   }

    501:   PetscOptionsBool("-ksp_constant_null_space","Add constant null space to Krylov solver matrix","MatSetNullSpace",PETSC_FALSE,&flg,&set);
    502:   if (set && flg) {
    503:     MatNullSpace nsp;
    504:     Mat          Amat = NULL;

    506:     MatNullSpaceCreate(comm,PETSC_TRUE,0,NULL,&nsp);
    507:     if (ksp->pc) { PCGetOperators(ksp->pc,&Amat,NULL); }
    508:     if (Amat) {
    509:       MatSetNullSpace(Amat,nsp);
    510:       MatNullSpaceDestroy(&nsp);
    511:     } else SETERRQ(comm,PETSC_ERR_ARG_WRONGSTATE,"Cannot set nullspace, matrix has not yet been provided");
    512:   }

    514:   flg = PETSC_FALSE;
    515:   if (ksp->pc) {
    516:     PetscObjectTypeCompare((PetscObject)ksp->pc,PCKSP,&flg);
    517:     if (!flg) PetscObjectTypeCompare((PetscObject)ksp->pc,PCBJACOBI,&flg);
    518:     if (!flg) PetscObjectTypeCompare((PetscObject)ksp->pc,PCDEFLATION,&flg);
    519:   }

    521:   if (flg) {
    522:     /* A hack for using dynamic tolerance in preconditioner */
    523:     PetscOptionsString("-sub_ksp_dynamic_tolerance","Use dynamic tolerance for PC if PC is a KSP","KSPMonitorDynamicTolerance","stdout",monfilename,sizeof(monfilename),&flg);
    524:     if (flg) {
    525:       KSPDynTolCtx *scale;
    526:       PetscMalloc1(1,&scale);
    527:       scale->bnrm = -1.0;
    528:       scale->coef = 1.0;
    529:       PetscOptionsReal("-sub_ksp_dynamic_tolerance_param","Parameter of dynamic tolerance for inner PCKSP","KSPMonitorDynamicToleranceParam",scale->coef,&scale->coef,&flg);
    530:       KSPMonitorSet(ksp,KSPMonitorDynamicTolerance,scale,KSPMonitorDynamicToleranceDestroy);
    531:     }
    532:   }

    534:   /*
    535:    Calls Python function
    536:   */
    537:   PetscOptionsString("-ksp_monitor_python","Use Python function","KSPMonitorSet",NULL,monfilename,sizeof(monfilename),&flg);
    538:   if (flg) {PetscPythonMonitorSet((PetscObject)ksp,monfilename);}
    539:   /*
    540:     Graphically plots preconditioned residual norm and range of residual element values
    541:   */
    542:   PetscOptionsBool("-ksp_monitor_lg_range","Monitor graphically range of preconditioned residual norm","KSPMonitorSet",PETSC_FALSE,&flg,&set);
    543:   if (set && flg) {
    544:     PetscViewer ctx;

    546:     PetscViewerDrawOpen(comm,NULL,NULL,PETSC_DECIDE,PETSC_DECIDE,400,300,&ctx);
    547:     KSPMonitorSet(ksp,KSPMonitorLGRange,ctx,(PetscErrorCode (*)(void**))PetscViewerDestroy);
    548:   }
    549:   /* TODO Do these show up in help? */
    550:   PetscOptionsHasName(((PetscObject) ksp)->options, prefix, "-ksp_converged_rate", &flg);
    551:   if (flg) {
    552:     const char *RateTypes[] = {"default", "residual", "error", "PetscRateType", "RATE_", NULL};
    553:     PetscEnum rtype = (PetscEnum) 1;

    555:     PetscOptionsGetEnum(((PetscObject) ksp)->options, prefix, "-ksp_converged_rate_type", RateTypes, &rtype, &flg);
    556:     if (rtype == (PetscEnum) 0 || rtype == (PetscEnum) 1) {KSPSetResidualHistory(ksp, NULL, PETSC_DETERMINE, PETSC_TRUE);}
    557:     if (rtype == (PetscEnum) 0 || rtype == (PetscEnum) 2) {KSPSetErrorHistory(ksp, NULL, PETSC_DETERMINE, PETSC_TRUE);}
    558:   }
    559:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view",&ksp->viewer,&ksp->format,&ksp->view);
    560:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_pre",&ksp->viewerPre,&ksp->formatPre,&ksp->viewPre);

    562:   flg = PETSC_FALSE;
    563:   PetscOptionsBool("-ksp_converged_reason_view_cancel","Cancel all the converged reason view functions set using KSPConvergedReasonViewSet","KSPConvergedReasonViewCancel",PETSC_FALSE,&flg,&set);
    564:   if (set && flg) {
    565:     KSPConvergedReasonViewCancel(ksp);
    566:   }
    567:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_converged_rate",&ksp->viewerRate,&ksp->formatRate,&ksp->viewRate);
    568:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_mat",&ksp->viewerMat,&ksp->formatMat,&ksp->viewMat);
    569:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_pmat",&ksp->viewerPMat,&ksp->formatPMat,&ksp->viewPMat);
    570:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_rhs",&ksp->viewerRhs,&ksp->formatRhs,&ksp->viewRhs);
    571:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_solution",&ksp->viewerSol,&ksp->formatSol,&ksp->viewSol);
    572:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_mat_explicit",&ksp->viewerMatExp,&ksp->formatMatExp,&ksp->viewMatExp);
    573:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_eigenvalues",&ksp->viewerEV,&ksp->formatEV,&ksp->viewEV);
    574:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_singularvalues",&ksp->viewerSV,&ksp->formatSV,&ksp->viewSV);
    575:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_eigenvalues_explicit",&ksp->viewerEVExp,&ksp->formatEVExp,&ksp->viewEVExp);
    576:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_final_residual",&ksp->viewerFinalRes,&ksp->formatFinalRes,&ksp->viewFinalRes);
    577:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_preconditioned_operator_explicit",&ksp->viewerPOpExp,&ksp->formatPOpExp,&ksp->viewPOpExp);
    578:   PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_view_diagonal_scale",&ksp->viewerDScale,&ksp->formatDScale,&ksp->viewDScale);

    580:   /* Deprecated options */
    581:   if (!ksp->viewEV) {
    582:     PetscOptionsDeprecated("-ksp_compute_eigenvalues",NULL,"3.9","Use -ksp_view_eigenvalues");
    583:     PetscOptionsGetViewer(comm, ((PetscObject) ksp)->options,prefix, "-ksp_compute_eigenvalues",&ksp->viewerEV,&ksp->formatEV,&ksp->viewEV);
    584:   }
    585:   if (!ksp->viewEV) {
    586:     PetscOptionsDeprecated("-ksp_plot_eigenvalues",NULL,"3.9","Use -ksp_view_eigenvalues draw");
    587:     PetscOptionsName("-ksp_plot_eigenvalues", "[deprecated since PETSc 3.9; use -ksp_view_eigenvalues draw]", "KSPView", &ksp->viewEV);
    588:     if (ksp->viewEV) {
    589:       ksp->formatEV = PETSC_VIEWER_DEFAULT;
    590:       ksp->viewerEV = PETSC_VIEWER_DRAW_(comm);
    591:       PetscObjectReference((PetscObject) ksp->viewerEV);
    592:     }
    593:   }
    594:   if (!ksp->viewEV) {
    595:     PetscOptionsDeprecated("-ksp_plot_eigencontours",NULL,"3.9","Use -ksp_view_eigenvalues draw::draw_contour");
    596:     PetscOptionsName("-ksp_plot_eigencontours", "[deprecated since PETSc 3.9; use -ksp_view_eigenvalues draw::draw_contour]", "KSPView", &ksp->viewEV);
    597:     if (ksp->viewEV) {
    598:       ksp->formatEV = PETSC_VIEWER_DRAW_CONTOUR;
    599:       ksp->viewerEV = PETSC_VIEWER_DRAW_(comm);
    600:       PetscObjectReference((PetscObject) ksp->viewerEV);
    601:     }
    602:   }
    603:   if (!ksp->viewEVExp) {
    604:     PetscOptionsDeprecated("-ksp_compute_eigenvalues_explicitly",NULL,"3.9","Use -ksp_view_eigenvalues_explicit");
    605:     PetscOptionsGetViewer(comm, ((PetscObject) ksp)->options,prefix, "-ksp_compute_eigenvalues_explicitly",&ksp->viewerEVExp,&ksp->formatEVExp,&ksp->viewEVExp);
    606:   }
    607:   if (!ksp->viewEVExp) {
    608:     PetscOptionsDeprecated("-ksp_plot_eigenvalues_explicitly",NULL,"3.9","Use -ksp_view_eigenvalues_explicit draw");
    609:     PetscOptionsName("-ksp_plot_eigenvalues_explicitly","[deprecated since PETSc 3.9; use -ksp_view_eigenvalues_explicit draw]","KSPView",&ksp->viewEVExp);
    610:     if (ksp->viewEVExp) {
    611:       ksp->formatEVExp = PETSC_VIEWER_DEFAULT;
    612:       ksp->viewerEVExp = PETSC_VIEWER_DRAW_(comm);
    613:       PetscObjectReference((PetscObject) ksp->viewerEVExp);
    614:     }
    615:   }
    616:   if (!ksp->viewSV) {
    617:     PetscOptionsDeprecated("-ksp_compute_singularvalues",NULL,"3.9","Use -ksp_view_singularvalues");
    618:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_compute_singularvalues",&ksp->viewerSV,&ksp->formatSV,&ksp->viewSV);
    619:   }
    620:   if (!ksp->viewFinalRes) {
    621:     PetscOptionsDeprecated("-ksp_final_residual",NULL,"3.9","Use -ksp_view_final_residual");
    622:     PetscOptionsGetViewer(comm,((PetscObject) ksp)->options,prefix,"-ksp_final_residual",&ksp->viewerFinalRes,&ksp->formatFinalRes,&ksp->viewFinalRes);
    623:   }

    625: #if defined(PETSC_HAVE_SAWS)
    626:   /*
    627:     Publish convergence information using AMS
    628:   */
    629:   PetscOptionsBool("-ksp_monitor_saws","Publish KSP progress using SAWs","KSPMonitorSet",PETSC_FALSE,&flg,&set);
    630:   if (set && flg) {
    631:     void *ctx;
    632:     KSPMonitorSAWsCreate(ksp,&ctx);
    633:     KSPMonitorSet(ksp,KSPMonitorSAWs,ctx,KSPMonitorSAWsDestroy);
    634:     KSPSetComputeSingularValues(ksp,PETSC_TRUE);
    635:   }
    636: #endif

    638:   /* -----------------------------------------------------------------------*/
    639:   KSPSetUpNorms_Private(ksp,PETSC_FALSE,NULL,&pcside);
    640:   PetscOptionsEnum("-ksp_pc_side","KSP preconditioner side","KSPSetPCSide",PCSides,(PetscEnum)pcside,(PetscEnum*)&pcside,&flg);
    641:   if (flg) {KSPSetPCSide(ksp,pcside);}

    643:   if (ksp->viewSV || ksp->viewEV) {
    644:     KSPSetComputeSingularValues(ksp,PETSC_TRUE);
    645:   }

    647: #if defined(PETSC_HAVE_SAWS)
    648:   {
    649:     PetscBool set;
    650:     flg  = PETSC_FALSE;
    651:     PetscOptionsBool("-ksp_saws_block","Block for SAWs at end of KSPSolve","PetscObjectSAWsBlock",((PetscObject)ksp)->amspublishblock,&flg,&set);
    652:     if (set) {
    653:       PetscObjectSAWsSetBlock((PetscObject)ksp,flg);
    654:     }
    655:   }
    656: #endif

    658:   nmax = ksp->nmax;
    659:   PetscOptionsDeprecated("-ksp_matsolve_block_size","-ksp_matsolve_batch_size","3.15",NULL);
    660:   PetscOptionsInt("-ksp_matsolve_batch_size", "Maximum number of columns treated simultaneously", "KSPSetMatSolveBatchSize", nmax, &nmax, &flg);
    661:   if (flg) {
    662:     KSPSetMatSolveBatchSize(ksp, nmax);
    663:   }

    665:   flg  = PETSC_FALSE;
    666:   PetscOptionsBool("-ksp_use_explicittranspose","Explicitly tranpose the system in KSPSolveTranspose","KSPSetUseExplicitTranspose",ksp->transpose.use_explicittranspose,&flg,&set);
    667:   if (set) {
    668:     KSPSetUseExplicitTranspose(ksp,flg);
    669:   }

    671:   if (ksp->ops->setfromoptions) {
    672:     (*ksp->ops->setfromoptions)(PetscOptionsObject,ksp);
    673:   }
    674:   skipoptions:
    675:   /* process any options handlers added with PetscObjectAddOptionsHandler() */
    676:   PetscObjectProcessOptionsHandlers(PetscOptionsObject,(PetscObject)ksp);
    677:   PetscOptionsEnd();
    678:   ksp->setfromoptionscalled++;
    679:   return(0);
    680: }

    682: /*@
    683:    KSPResetFromOptions - Sets various KSP parameters from user options ONLY if the KSP was previously set from options

    685:    Collective on ksp

    687:    Input Parameter:
    688: .  ksp - the KSP context

    690:    Level: beginner

    692: .seealso: KSPSetFromOptions(), KSPSetOptionsPrefix()
    693: @*/
    694: PetscErrorCode KSPResetFromOptions(KSP ksp)
    695: {

    699:   if (ksp->setfromoptionscalled) {KSPSetFromOptions(ksp);}
    700:   return(0);
    701: }