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C++ KSPSetFromOptions函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中KSPSetFromOptions函数的典型用法代码示例。如果您正苦于以下问题：C++ KSPSetFromOptions函数的具体用法？C++ KSPSetFromOptions怎么用？C++ KSPSetFromOptions使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了KSPSetFromOptions函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: MatAssemblyBegin

void PETSc::Solve_withPureNeumann_GMRES(void)
{
    	ierr = MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
  	ierr = MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
  	
  	ierr = VecAssemblyBegin(x);
  	ierr = VecAssemblyEnd(x);
  	
  	ierr = VecAssemblyBegin(b);
  	ierr = VecAssemblyEnd(b);
  	
	
	MatNullSpaceCreate(PETSC_COMM_WORLD,PETSC_TRUE,0,PETSC_NULL,&nullsp);
        KSPSetNullSpace(ksp,nullsp);
	MatNullSpaceRemove(nullsp,b,PETSC_NULL);

	
        KSPSetOperators(ksp,A,A,DIFFERENT_NONZERO_PATTERN);
        
	KSPSetType(ksp,KSPGMRES);

	//KSPGetPC(ksp, &pc);
	//PCSetType(pc, PCASM);
        KSPSetFromOptions(ksp);
        KSPSetUp(ksp);
	//start_clock("Before Petsc Solve in pure neumann solver");
        KSPSolve(ksp,b,x);
	//stop_clock("After Petsc Solve in pure neumann solver");
}
开发者ID:tonyguo1，项目名称:LSGFD，代码行数:29，代码来源:solver_petsc.cpp


示例2: main

int main(int argc,char **argv)
{
  KSP            ksp;
  DM             da;
  UserContext    user;
  PetscInt       bc;
  PetscErrorCode ierr;

  PetscInitialize(&argc,&argv,(char *)0,help);
  ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
  ierr = DMDACreate2d(PETSC_COMM_WORLD, DMDA_BOUNDARY_NONE, DMDA_BOUNDARY_NONE,DMDA_STENCIL_STAR,-11,-11,PETSC_DECIDE,PETSC_DECIDE,1,1,PETSC_NULL,PETSC_NULL,&da);CHKERRQ(ierr);
  ierr = KSPSetDM(ksp,(DM)da);
  ierr = DMSetApplicationContext(da,&user);CHKERRQ(ierr);

  user.uu = 1.0;
  user.tt = 1.0;
  bc   = (PetscInt)NEUMANN; // Use Neumann Boundary Conditions
  user.bcType = (BCType)bc;


  ierr = KSPSetComputeRHS(ksp,ComputeRHS,&user);CHKERRQ(ierr);
  ierr = KSPSetComputeOperators(ksp,ComputeJacobian,&user);CHKERRQ(ierr);
  ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
  ierr = KSPSolve(ksp,PETSC_NULL,PETSC_NULL);CHKERRQ(ierr);

  ierr = DMDestroy(&da);CHKERRQ(ierr);
  ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
  ierr = PetscFinalize();CHKERRQ(ierr);
  return 0;
}
开发者ID:erdc-cm，项目名称:petsc-dev，代码行数:30，代码来源:ex50.c


示例3: p_build

  /// Do what is necessary to build this instance
  void p_build(const std::string& option_prefix)
  {
    PetscErrorCode ierr;
    try  {
      parallel::Communicator comm(this->communicator());
      if (this->p_doSerial) {
        comm = this->communicator().self();
      }
      ierr = KSPCreate(comm, &p_KSP); CHKERRXX(ierr);
      if (!this->p_guessZero) {
        ierr = KSPSetInitialGuessNonzero(p_KSP,PETSC_TRUE); CHKERRXX(ierr); 
      } else {
        ierr = KSPSetInitialGuessNonzero(p_KSP,PETSC_FALSE); CHKERRXX(ierr); 
      }
      ierr = KSPSetOptionsPrefix(p_KSP, option_prefix.c_str()); CHKERRXX(ierr);
      PC pc;
      ierr = KSPGetPC(p_KSP, &pc); CHKERRXX(ierr);
      ierr = PCSetOptionsPrefix(pc, option_prefix.c_str()); CHKERRXX(ierr);

      ierr = KSPSetTolerances(p_KSP, 
                              LinearSolverImplementation<T, I>::p_relativeTolerance, 
                              LinearSolverImplementation<T, I>::p_solutionTolerance, 
                              PETSC_DEFAULT,
                              LinearSolverImplementation<T, I>::p_maxIterations); CHKERRXX(ierr);

      ierr = KSPSetFromOptions(p_KSP);CHKERRXX(ierr);
    } catch (const PETSC_EXCEPTION_TYPE& e) {
      throw PETScException(ierr, e);
    }
  }
开发者ID:Anastien，项目名称:GridPACK，代码行数:31，代码来源:petsc_linear_solver_implementation.hpp


示例4: SolvePressure

PetscErrorCode SolvePressure(UserContext *uc)
{
  PetscErrorCode ierr;
  
  PetscFunctionBegin;
  PetscLogEventBegin(EVENT_SolvePressure,0,0,0,0);

  ierr = KSPCreate(PETSC_COMM_WORLD, &uc->ksp); CHKERRQ(ierr);
  ierr = KSPSetType(uc->ksp,KSPCG); CHKERRQ(ierr);
  ierr = KSPSetOperators(uc->ksp,uc->A,uc->A,SAME_NONZERO_PATTERN); CHKERRQ(ierr);
  ierr = KSPSetFromOptions(uc->ksp); CHKERRQ(ierr);
  ierr = KSPSetTolerances(uc->ksp, 0.000001, PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT); CHKERRQ(ierr);
  
  ierr = KSPSetType( uc->ksp, KSPPREONLY); CHKERRQ(ierr);
  PC pc;
  ierr = KSPGetPC(uc->ksp, &pc); CHKERRQ(ierr);
  ierr = PCSetType(pc, PCLU); CHKERRQ(ierr);
  
  ierr = KSPSolve(uc->ksp,uc->b,uc->p);CHKERRQ(ierr);
  
  KSPConvergedReason reason;
  KSPGetConvergedReason(uc->ksp,&reason);
  PetscPrintf(PETSC_COMM_WORLD,"Pressure KSPConvergedReason: %D\n", reason);
  // if( reason < 0 )    SETERRQ(PETSC_ERR_CONV_FAILED, "Exiting: Failed to converge\n");
  
  PetscLogEventEnd(EVENT_SolvePressure,0,0,0,0);
  PetscFunctionReturn(0);
}
开发者ID:adrielb，项目名称:DCell，代码行数:28，代码来源:PressurePoisson.c


示例5: main

int main(int argc, char **argv)
{
    Mat            A;
    KSP            ksp;
    DM             shell;
    Vec            *left, *right;
    MPI_Comm       c;
    PetscErrorCode ierr;

    ierr = PetscInitialize(&argc, &argv, NULL, NULL);if (ierr) return ierr;
    c = PETSC_COMM_WORLD;

    ierr = MatCreate(c, &A); CHKERRQ(ierr);
    ierr = MatSetSizes(A, 1, 1, PETSC_DECIDE, PETSC_DECIDE); CHKERRQ(ierr);
    ierr = MatSetFromOptions(A); CHKERRQ(ierr);
    ierr = MatSetUp(A); CHKERRQ(ierr);
    ierr = KSPCreate(c, &ksp); CHKERRQ(ierr);
    ierr = KSPSetOperators(ksp, A, A); CHKERRQ(ierr);
    ierr = KSPSetFromOptions(ksp); CHKERRQ(ierr);
    ierr = DMShellCreate(c, &shell); CHKERRQ(ierr);
    ierr = DMSetFromOptions(shell); CHKERRQ(ierr);
    ierr = DMSetUp(shell); CHKERRQ(ierr);
    ierr = KSPSetDM(ksp, shell); CHKERRQ(ierr);

    ierr = KSPCreateVecs(ksp, 1, &right, 1, &left); CHKERRQ(ierr);
    ierr = VecView(right[0], PETSC_VIEWER_STDOUT_(c));CHKERRQ(ierr);
    ierr = VecDestroyVecs(1,&right); CHKERRQ(ierr);
    ierr = VecDestroyVecs(1,&left); CHKERRQ(ierr);

    ierr = DMDestroy(&shell); CHKERRQ(ierr);
    ierr = KSPDestroy(&ksp); CHKERRQ(ierr);
    ierr = MatDestroy(&A); CHKERRQ(ierr);
    PetscFinalize();
    return 0;
}
开发者ID:tom-klotz，项目名称:petsc，代码行数:35，代码来源:ex45.c


示例6: PCASMGetSubKSP

  void PetscPreconditioner::set_petsc_subpreconditioner_type(const PCType type, PC& pc)  {

    int ierr;
    KSP* subksps;
    int nlocal;

    ierr = PCASMGetSubKSP(pc, &nlocal, PETSC_NULL, &subksps);
    CHKERRABORT(MPI_COMM_WORLD, ierr);

    PetscReal epsilon = 1.e-16;

    for(int i = 0; i < nlocal; i++) {
      PC subpc;

      ierr = KSPGetPC(subksps[i], &subpc);
      CHKERRABORT(MPI_COMM_WORLD, ierr);

      ierr = KSPSetTolerances(subksps[i], PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT, 1);
      CHKERRABORT(MPI_COMM_WORLD, ierr);

      ierr = KSPSetFromOptions(subksps[i]);
      CHKERRABORT(MPI_COMM_WORLD, ierr);

      ierr = PCSetType(subpc, type);
      CHKERRABORT(MPI_COMM_WORLD, ierr);

      ierr = PCFactorSetZeroPivot(subpc, epsilon);
      CHKERRABORT(MPI_COMM_WORLD, ierr);

      ierr = PCFactorSetShiftType(subpc, MAT_SHIFT_NONZERO);
      CHKERRABORT(MPI_COMM_WORLD, ierr);
    }
  }
开发者ID:gcapodag，项目名称:MyFEMuS，代码行数:33，代码来源:PetscPreconditioner.cpp


示例7: main

int main(int argc,char **args)
{
  KSP            ksp;             /* linear solver context */
  Mat            A;            /* matrix */
  Vec            x,b;          /* approx solution, RHS, exact solution */
  PetscViewer    fd;               /* viewer */
  PetscErrorCode ierr;

  PetscInitialize(&argc,&args,(char *)0,help);
  fd = PETSC_VIEWER_SOCKET_WORLD;

  ierr = VecCreate(PETSC_COMM_WORLD,&b);CHKERRQ(ierr);
  ierr = VecLoad(b,fd);CHKERRQ(ierr);
  ierr = MatCreate(PETSC_COMM_WORLD,&A);CHKERRQ(ierr);
  ierr = MatLoad(A,fd);CHKERRQ(ierr);
  ierr = VecDuplicate(b,&x);CHKERRQ(ierr);

  ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
  ierr = KSPSetOperators(ksp,A,A,SAME_NONZERO_PATTERN);CHKERRQ(ierr);
  ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
  ierr = KSPSetUp(ksp);CHKERRQ(ierr);
  ierr = KSPSolve(ksp,b,x);CHKERRQ(ierr);
  ierr = VecView(x,fd);CHKERRQ(ierr);
  ierr = MatDestroy(&A);CHKERRQ(ierr);
  ierr = VecDestroy(&b);CHKERRQ(ierr);
  ierr = VecDestroy(&x);CHKERRQ(ierr);
  ierr = KSPDestroy(&ksp);CHKERRQ(ierr);

  ierr = PetscFinalize();
  return 0;
}
开发者ID:erdc-cm，项目名称:petsc-dev，代码行数:31，代码来源:ex41.c


示例8: main

int main(int argc,char **argv)
{
  PetscErrorCode ierr;
  KSP            ksp;
  DM             da,shell;
  PetscInt       levels;

  PetscInitialize(&argc,&argv,(char*)0,help);

  ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
  ierr = DMDACreate1d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE,-129,1,1,0,&da);CHKERRQ(ierr);
  ierr = MyDMShellCreate(PETSC_COMM_WORLD,da,&shell);CHKERRQ(ierr);
  /* these two lines are not needed but allow PCMG to automatically know how many multigrid levels the user wants */
  ierr = DMGetRefineLevel(da,&levels);CHKERRQ(ierr);
  ierr = DMSetRefineLevel(shell,levels);CHKERRQ(ierr);

  ierr = KSPSetDM(ksp,shell);CHKERRQ(ierr);
  ierr = KSPSetComputeRHS(ksp,ComputeRHS,NULL);CHKERRQ(ierr);
  ierr = KSPSetComputeOperators(ksp,ComputeMatrix,NULL);CHKERRQ(ierr);
  ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
  ierr = KSPSolve(ksp,NULL,NULL);CHKERRQ(ierr);

  ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
  ierr = DMDestroy(&shell);CHKERRQ(ierr);
  ierr = DMDestroy(&da);CHKERRQ(ierr);
  ierr = PetscFinalize();

  return 0;
}
开发者ID:000Justin000，项目名称:ATPESC，代码行数:29，代码来源:ex65.c


示例9: TaoSetFromOptions_BQNLS

static PetscErrorCode TaoSetFromOptions_BQNLS(PetscOptionItems *PetscOptionsObject,Tao tao)
{
  TAO_BNK        *bnk = (TAO_BNK *)tao->data;
  TAO_BQNK       *bqnk = (TAO_BQNK*)bnk->ctx;
  PetscErrorCode ierr;
  KSPType        ksp_type;
  PetscBool      is_spd;

  PetscFunctionBegin;
  ierr = PetscOptionsHead(PetscOptionsObject,"Quasi-Newton-Krylov method for bound constrained optimization");CHKERRQ(ierr);
  ierr = PetscOptionsEList("-tao_bqnls_as_type", "active set estimation method", "", BNK_AS, BNK_AS_TYPES, BNK_AS[bnk->as_type], &bnk->as_type, 0);CHKERRQ(ierr);
  ierr = PetscOptionsReal("-tao_bqnls_epsilon", "(developer) tolerance used when computing actual and predicted reduction", "", bnk->epsilon, &bnk->epsilon,NULL);CHKERRQ(ierr);
  ierr = PetscOptionsReal("-tao_bqnls_as_tol", "(developer) initial tolerance used when estimating actively bounded variables", "", bnk->as_tol, &bnk->as_tol,NULL);CHKERRQ(ierr);
  ierr = PetscOptionsReal("-tao_bqnls_as_step", "(developer) step length used when estimating actively bounded variables", "", bnk->as_step, &bnk->as_step,NULL);CHKERRQ(ierr);
  ierr = PetscOptionsInt("-tao_bqnls_max_cg_its", "number of BNCG iterations to take for each Newton step", "", bnk->max_cg_its, &bnk->max_cg_its,NULL);CHKERRQ(ierr);
  ierr = PetscOptionsTail();CHKERRQ(ierr);
  ierr = TaoSetFromOptions(bnk->bncg);CHKERRQ(ierr);
  ierr = TaoLineSearchSetFromOptions(tao->linesearch);CHKERRQ(ierr);
  ierr = KSPSetFromOptions(tao->ksp);CHKERRQ(ierr);
  ierr = KSPGetType(tao->ksp,&ksp_type);CHKERRQ(ierr);
  bnk->is_nash = bnk->is_gltr = bnk->is_stcg = PETSC_FALSE;
  ierr = MatSetFromOptions(bqnk->B);CHKERRQ(ierr);
  ierr = MatGetOption(bqnk->B, MAT_SPD, &is_spd);CHKERRQ(ierr);
  if (!is_spd) SETERRQ(PetscObjectComm((PetscObject)tao), PETSC_ERR_ARG_INCOMP, "LMVM matrix must be symmetric positive-definite");
  PetscFunctionReturn(0);
}
开发者ID:firedrakeproject，项目名称:petsc，代码行数:26，代码来源:bqnls.c


示例10: TSMonitorSPEigCtxDestroy

/*@C
   TSMonitorSPEigCtxCreate - Creates a context for use with TS to monitor the eigenvalues of the linearized operator

   Collective on TS

   Input Parameters:
+  host - the X display to open, or null for the local machine
.  label - the title to put in the title bar
.  x, y - the screen coordinates of the upper left coordinate of the window
.  m, n - the screen width and height in pixels
-  howoften - if positive then determines the frequency of the plotting, if -1 then only at the final time

   Output Parameter:
.  ctx - the context

   Options Database Key:
.  -ts_monitor_sp_eig - plot egienvalues of linearized right hand side

   Notes:
   Use TSMonitorSPEigCtxDestroy() to destroy.

   Currently only works if the Jacobian is provided explicitly.

   Currently only works for ODEs u_t - F(t,u) = 0; that is with no mass matrix.

   Level: intermediate

.keywords: TS, monitor, line graph, residual, seealso

.seealso: TSMonitorSPEigTimeStep(), TSMonitorSet(), TSMonitorLGSolution(), TSMonitorLGError()

@*/
PetscErrorCode  TSMonitorSPEigCtxCreate(MPI_Comm comm,const char host[],const char label[],int x,int y,int m,int n,PetscInt howoften,TSMonitorSPEigCtx *ctx)
{
  PetscDraw      win;
  PetscErrorCode ierr;
  PC             pc;

  PetscFunctionBegin;
  ierr = PetscNew(ctx);CHKERRQ(ierr);
  ierr = PetscRandomCreate(comm,&(*ctx)->rand);CHKERRQ(ierr);
  ierr = PetscRandomSetFromOptions((*ctx)->rand);CHKERRQ(ierr);
  ierr = PetscDrawCreate(comm,host,label,x,y,m,n,&win);CHKERRQ(ierr);
  ierr = PetscDrawSetFromOptions(win);CHKERRQ(ierr);
  ierr = PetscDrawSPCreate(win,1,&(*ctx)->drawsp);CHKERRQ(ierr);
  ierr = KSPCreate(comm,&(*ctx)->ksp);CHKERRQ(ierr);
  ierr = KSPSetOptionsPrefix((*ctx)->ksp,"ts_monitor_sp_eig_");CHKERRQ(ierr); /* this is wrong, used use also prefix from the TS */
  ierr = KSPSetType((*ctx)->ksp,KSPGMRES);CHKERRQ(ierr);
  ierr = KSPGMRESSetRestart((*ctx)->ksp,200);CHKERRQ(ierr);
  ierr = KSPSetTolerances((*ctx)->ksp,1.e-10,PETSC_DEFAULT,PETSC_DEFAULT,200);CHKERRQ(ierr);
  ierr = KSPSetComputeSingularValues((*ctx)->ksp,PETSC_TRUE);CHKERRQ(ierr);
  ierr = KSPSetFromOptions((*ctx)->ksp);CHKERRQ(ierr);
  ierr = KSPGetPC((*ctx)->ksp,&pc);CHKERRQ(ierr);
  ierr = PCSetType(pc,PCNONE);CHKERRQ(ierr);

  (*ctx)->howoften          = howoften;
  (*ctx)->computeexplicitly = PETSC_FALSE;

  ierr = PetscOptionsGetBool(NULL,"-ts_monitor_sp_eig_explicitly",&(*ctx)->computeexplicitly,NULL);CHKERRQ(ierr);

  (*ctx)->comm = comm;
  (*ctx)->xmin = -2.1;
  (*ctx)->xmax = 1.1;
  (*ctx)->ymin = -1.1;
  (*ctx)->ymax = 1.1;
  PetscFunctionReturn(0);
}
开发者ID:00liujj，项目名称:petsc，代码行数:67，代码来源:tseig.c


示例11: KSPCreate


//.........这里部分代码省略.........
 KSPGLTR       "gltr"
 KSPGMRES      "gmres"
 KSPFGMRES     "fgmres" 
 KSPLGMRES     "lgmres"
 KSPDGMRES     "dgmres"
 KSPTCQMR      "tcqmr"
 KSPBCGS       "bcgs"
 KSPIBCGS        "ibcgs"
 KSPBCGSL        "bcgsl"
 KSPCGS        "cgs"
 KSPTFQMR      "tfqmr"
 KSPCR         "cr"
 KSPLSQR       "lsqr"
 KSPPREONLY    "preonly"
 KSPQCG        "qcg"
 KSPBICG       "bicg"
 KSPMINRES     "minres"
 KSPSYMMLQ     "symmlq"
 KSPLCD        "lcd"
 KSPPYTHON     "python"
 KSPBROYDEN    "broyden"
 KSPGCR        "gcr"
 KSPNGMRES     "ngmres"
 KSPSPECEST    "specest"

 PCNONE            "none"
 PCJACOBI          "jacobi"
 PCSOR             "sor"
 PCLU              "lu"
 PCSHELL           "shell"
 PCBJACOBI         "bjacobi"
 PCMG              "mg"
 PCEISENSTAT       "eisenstat"
 PCILU             "ilu"
 PCICC             "icc"
 PCASM             "asm"
 PCGASM            "gasm"
 PCKSP             "ksp"
 PCCOMPOSITE       "composite"
 PCREDUNDANT       "redundant"
 PCSPAI            "spai"
 PCNN              "nn"
 PCCHOLESKY        "cholesky"
 PCPBJACOBI        "pbjacobi"
 PCMAT             "mat"
 PCHYPRE           "hypre"
 PCPARMS           "parms"
 PCFIELDSPLIT      "fieldsplit"
 PCTFS             "tfs"
 PCML              "ml"
 PCPROMETHEUS      "prometheus"
 PCGALERKIN        "galerkin"
 PCEXOTIC          "exotic"
 PCHMPI            "hmpi"
 PCSUPPORTGRAPH    "supportgraph"
 PCASA             "asa"
 PCCP              "cp"
 PCBFBT            "bfbt"
 PCLSC             "lsc"
 PCPYTHON          "python"
 PCPFMG            "pfmg"
 PCSYSPFMG         "syspfmg"
 PCREDISTRIBUTE    "redistribute"
 PCSACUSP          "sacusp"
 PCSACUSPPOLY      "sacusppoly"
 PCBICGSTABCUSP    "bicgstabcusp"
 PCSVD             "svd"
 PCAINVCUSP        "ainvcusp"
 PCGAMG            "gamg"

*/
void PETScLinearSolver::Config(const PetscReal tol, const PetscInt maxits, const KSPType lsol,
                               const PCType prec_type, const std::string &prefix)
{
   ltolerance = tol;
   sol_type = lsol;
   pc_type = prec_type; 

   KSPCreate(PETSC_COMM_WORLD,&lsolver);

#if (PETSC_VERSION_MAJOR == 3) && (PETSC_VERSION_MINOR > 4)
   KSPSetOperators(lsolver, A, A);
#else
   KSPSetOperators(lsolver, A, A, DIFFERENT_NONZERO_PATTERN);
#endif

   KSPSetType(lsolver,lsol);

   KSPGetPC(lsolver, &prec);
   PCSetType(prec, prec_type); //  PCJACOBI); //PCNONE);
   KSPSetTolerances(lsolver,ltolerance, PETSC_DEFAULT, PETSC_DEFAULT, maxits);

   if( !prefix.empty() )
   {
       KSPSetOptionsPrefix(lsolver, prefix.c_str());
       PCSetOptionsPrefix(prec, prefix.c_str());
   }

   KSPSetFromOptions(lsolver);
}
开发者ID:drjod，项目名称:ogs_kb1，代码行数:101，代码来源:PETScLinearSolver.cpp


示例12: PCSetUp_KSP

static PetscErrorCode PCSetUp_KSP(PC pc)
{
  PetscErrorCode ierr;
  PC_KSP         *jac = (PC_KSP*)pc->data;
  Mat            mat;
  PetscBool      A;

  PetscFunctionBegin;
  if (!jac->ksp) {ierr = PCKSPCreateKSP_KSP(pc);CHKERRQ(ierr);}
  ierr = KSPSetFromOptions(jac->ksp);CHKERRQ(ierr);
  if (jac->use_true_matrix) mat = pc->mat;
  else                      mat = pc->pmat;

  ierr = KSPGetOperatorsSet(jac->ksp,&A,PETSC_NULL);CHKERRQ(ierr);
  if (!A) {
    ierr = KSPSetOperators(jac->ksp,mat,pc->pmat,pc->flag);CHKERRQ(ierr);
  } else if (pc->flag != SAME_PRECONDITIONER) {
    Mat Amat,Bmat;
    ierr = KSPGetOperators(jac->ksp,&Amat,&Bmat,PETSC_NULL);CHKERRQ(ierr);
    if (Amat == mat && Bmat == pc->pmat) {
      /* The user has not replaced the matrices so we are expected to forward the update. This incorrectly diagnoses
       * changed matrices at the top level as the user manually changing the inner matrices, but we have no way to
       * identify that in this context. The longer term solution is to track matrix state internally.
       */
      ierr = KSPSetOperators(jac->ksp,mat,pc->pmat,pc->flag);CHKERRQ(ierr);
    }
  }
  ierr = KSPSetUp(jac->ksp);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}
开发者ID:erdc-cm，项目名称:petsc-dev，代码行数:30，代码来源:pcksp.c


示例13: main

int main(int argc,char **argv)
{
  PetscErrorCode ierr;
  PetscInt       i;
  KSP            ksp;
  DM             da;
  Vec            x;

  PetscInitialize(&argc,&argv,(char*)0,help);

  ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
  ierr = DMDACreate1d(PETSC_COMM_WORLD,DMDA_BOUNDARY_PERIODIC,-3,2,1,0,&da);CHKERRQ(ierr);
  ierr = KSPSetDM(ksp,da);CHKERRQ(ierr);
  ierr = KSPSetComputeRHS(ksp,ComputeRHS,NULL);CHKERRQ(ierr);
  ierr = KSPSetComputeOperators(ksp,ComputeMatrix,NULL);CHKERRQ(ierr);

  ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
  ierr = DMCreateGlobalVector(da,&x);CHKERRQ(ierr);
  ierr = ComputeInitialSolution(da,x);CHKERRQ(ierr);
  ierr = DMSetApplicationContext(da,x);CHKERRQ(ierr);
  ierr = KSPSetUp(ksp);CHKERRQ(ierr);
  ierr = VecView(x,PETSC_VIEWER_DRAW_WORLD);CHKERRQ(ierr);
  for (i=0; i<10; i++) {
    ierr = KSPSolve(ksp,NULL,x);CHKERRQ(ierr);
    ierr = VecView(x,PETSC_VIEWER_DRAW_WORLD);CHKERRQ(ierr);
  }
  ierr = VecDestroy(&x);CHKERRQ(ierr);
  ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
  ierr = DMDestroy(&da);CHKERRQ(ierr);
  ierr = PetscFinalize();
  return 0;
}
开发者ID:feelpp，项目名称:debian-petsc，代码行数:32，代码来源:ex28.c


示例14: PCSetUp_LSC

static PetscErrorCode PCSetUp_LSC(PC pc)
{
  PC_LSC         *lsc = (PC_LSC*)pc->data;
  Mat            L,Lp,B,C;
  PetscErrorCode ierr;

  PetscFunctionBegin;
  ierr = PCLSCAllocate_Private(pc);CHKERRQ(ierr);
  ierr = PetscObjectQuery((PetscObject)pc->mat,"LSC_L",(PetscObject*)&L);CHKERRQ(ierr);
  if (!L) {ierr = PetscObjectQuery((PetscObject)pc->pmat,"LSC_L",(PetscObject*)&L);CHKERRQ(ierr);}
  ierr = PetscObjectQuery((PetscObject)pc->pmat,"LSC_Lp",(PetscObject*)&Lp);CHKERRQ(ierr);
  if (!Lp) {ierr = PetscObjectQuery((PetscObject)pc->mat,"LSC_Lp",(PetscObject*)&Lp);CHKERRQ(ierr);}
  if (!L) {
    ierr = MatSchurComplementGetSubMatrices(pc->mat,NULL,NULL,&B,&C,NULL);CHKERRQ(ierr);
    if (!lsc->L) {
      ierr = MatMatMult(C,B,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&lsc->L);CHKERRQ(ierr);
    } else {
      ierr = MatMatMult(C,B,MAT_REUSE_MATRIX,PETSC_DEFAULT,&lsc->L);CHKERRQ(ierr);
    }
    Lp = L = lsc->L;
  }
  if (lsc->scale) {
    Mat Ap;
    ierr = MatSchurComplementGetSubMatrices(pc->mat,NULL,&Ap,NULL,NULL,NULL);CHKERRQ(ierr);
    ierr = MatGetDiagonal(Ap,lsc->scale);CHKERRQ(ierr); /* Should be the mass matrix, but we don't have plumbing for that yet */
    ierr = VecReciprocal(lsc->scale);CHKERRQ(ierr);
  }
  ierr = KSPSetOperators(lsc->kspL,L,Lp);CHKERRQ(ierr);
  ierr = KSPSetFromOptions(lsc->kspL);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}
开发者ID:pombredanne，项目名称:petsc，代码行数:31，代码来源:lsc.c


示例15: DMCreateLibMesh

  void PetscDMNonlinearSolver<T>::init()
  {
    PetscErrorCode ierr;
    DM dm;
    this->PetscNonlinearSolver<T>::init();

    // Attaching a DM with the function and Jacobian callbacks to SNES.
    ierr = DMCreateLibMesh(libMesh::COMM_WORLD, this->system(), &dm); CHKERRABORT(libMesh::COMM_WORLD, ierr);
    ierr = DMSetFromOptions(dm);               CHKERRABORT(libMesh::COMM_WORLD, ierr);
    ierr = DMSetUp(dm);                        CHKERRABORT(libMesh::COMM_WORLD, ierr);
    ierr = SNESSetDM(this->_snes, dm);         CHKERRABORT(libMesh::COMM_WORLD, ierr);
    // SNES now owns the reference to dm.
    ierr = DMDestroy(&dm);                     CHKERRABORT(libMesh::COMM_WORLD, ierr);
    KSP ksp;
    ierr = SNESGetKSP (this->_snes, &ksp);     CHKERRABORT(libMesh::COMM_WORLD,ierr);

    // Set the tolerances for the iterative solver.  Use the user-supplied
    // tolerance for the relative residual & leave the others at default values
    ierr = KSPSetTolerances (ksp, this->initial_linear_tolerance, PETSC_DEFAULT,PETSC_DEFAULT, this->max_linear_iterations); CHKERRABORT(libMesh::COMM_WORLD,ierr);

    // Set the tolerances for the non-linear solver.
    ierr = SNESSetTolerances(this->_snes,
			     this->absolute_residual_tolerance,
			     this->relative_residual_tolerance,
			     this->absolute_step_tolerance,
			     this->max_nonlinear_iterations,
			     this->max_function_evaluations);
    CHKERRABORT(libMesh::COMM_WORLD,ierr);

    //Pull in command-line options
    KSPSetFromOptions(ksp);
    SNESSetFromOptions(this->_snes);
  }
开发者ID:paulovieira，项目名称:libmesh，代码行数:33，代码来源:petsc_dm_nonlinear_solver.C


示例16: KSPComputeShifts_GMRES

static PetscErrorCode KSPComputeShifts_GMRES(KSP ksp)
{
  PetscErrorCode ierr;
  KSP_AGMRES     *agmres = (KSP_AGMRES*)(ksp->data);
  KSP            kspgmres;
  Mat            Amat, Pmat;
  MatStructure   flag;
  PetscInt       max_k = agmres->max_k;
  PC             pc;
  PetscInt       m;
  PetscScalar    *Rshift, *Ishift;


  PetscFunctionBegin;
  /* Perform one cycle of classical GMRES (with the Arnoldi process) to get the Hessenberg matrix
   We assume here that the ksp is AGMRES and that the operators for the
   linear system have been set in this ksp */
  ierr = KSPCreate(PetscObjectComm((PetscObject)ksp), &kspgmres);CHKERRQ(ierr);
  if (!ksp->pc) { ierr = KSPGetPC(ksp,&ksp->pc);CHKERRQ(ierr); }
  ierr = PCGetOperators(ksp->pc, &Amat, &Pmat);CHKERRQ(ierr);
  ierr = KSPSetOperators(kspgmres, Amat, Pmat);CHKERRQ(ierr);
  ierr = KSPSetFromOptions(kspgmres);CHKERRQ(ierr);
  ierr = PetscOptionsHasName(NULL, "-ksp_view", &flg);CHKERRQ(ierr);
  if (flag) { ierr = PetscOptionsClearValue("-ksp_view");CHKERRQ(ierr); }
  ierr = KSPSetType(kspgmres, KSPGMRES);CHKERRQ(ierr);
  ierr = KSPGMRESSetRestart(kspgmres, max_k);CHKERRQ(ierr);
  ierr = KSPGetPC(ksp, &pc);CHKERRQ(ierr);
  ierr = KSPSetPC(kspgmres, pc);CHKERRQ(ierr);
  /* Copy common options */
  kspgmres->pc_side = ksp->pc_side;
  /* Setup KSP context */
  ierr = KSPSetComputeEigenvalues(kspgmres, PETSC_TRUE);CHKERRQ(ierr);
  ierr = KSPSetUp(kspgmres);CHKERRQ(ierr);

  kspgmres->max_it = max_k; /* Restrict the maximum number of iterations to one cycle of GMRES */
  kspgmres->rtol   = ksp->rtol;

  ierr = KSPSolve(kspgmres, ksp->vec_rhs, ksp->vec_sol);CHKERRQ(ierr);

  ksp->guess_zero = PETSC_FALSE;
  ksp->rnorm      = kspgmres->rnorm;
  ksp->its        = kspgmres->its;
  if (kspgmres->reason == KSP_CONVERGED_RTOL) {
    ksp->reason = KSP_CONVERGED_RTOL;
    PetscFunctionReturn(0);
  } else ksp->reason = KSP_CONVERGED_ITERATING;
  /* Now, compute the Shifts values */
  ierr = PetscMalloc2(max_k,&Rshift,max_k,&Ishift);CHKERRQ(ierr);
  ierr = KSPComputeEigenvalues(kspgmres, max_k, Rshift, Ishift, &m);CHKERRQ(ierr);
  if (m < max_k) SETERRQ(PetscObjectComm((PetscObject)ksp),PETSC_ERR_PLIB, "Unable to compute the Shifts for the Newton basis");
  else {
    ierr = KSPAGMRESLejaOrdering(Rshift, Ishift, agmres->Rshift, agmres->Ishift, max_k);CHKERRQ(ierr);

    agmres->HasShifts = PETSC_TRUE;
  }
  /* Restore KSP view options */
  if (flg) { ierr = PetscOptionsSetValue("-ksp_view", "");CHKERRQ(ierr); }
  PetscFunctionReturn(0);
}
开发者ID:fengyuqi，项目名称:petsc，代码行数:59，代码来源:agmres.c


示例17: PCBDDCScalingSetUp_Deluxe_Private

static PetscErrorCode PCBDDCScalingSetUp_Deluxe_Private(PC pc)
{
  PC_BDDC                *pcbddc=(PC_BDDC*)pc->data;
  PCBDDCDeluxeScaling    deluxe_ctx=pcbddc->deluxe_ctx;
  PCBDDCSubSchurs        sub_schurs = pcbddc->sub_schurs;
  PetscErrorCode         ierr;

  PetscFunctionBegin;
  if (!sub_schurs->n_subs) {
    PetscFunctionReturn(0);
  }

  /* Create work vectors for sequential part of deluxe */
  ierr = MatCreateVecs(sub_schurs->S_Ej_all,&deluxe_ctx->seq_work1,&deluxe_ctx->seq_work2);CHKERRQ(ierr);

  /* Compute deluxe sequential scatter */
  if (sub_schurs->reuse_mumps && !sub_schurs->is_dir) {
    PCBDDCReuseMumps reuse_mumps = sub_schurs->reuse_mumps;
    ierr = PetscObjectReference((PetscObject)reuse_mumps->correction_scatter_B);CHKERRQ(ierr);
    deluxe_ctx->seq_scctx = reuse_mumps->correction_scatter_B;
  } else {
    ierr = VecScatterCreate(pcbddc->work_scaling,sub_schurs->is_Ej_all,deluxe_ctx->seq_work1,NULL,&deluxe_ctx->seq_scctx);CHKERRQ(ierr);
  }

  /* Create Mat object for deluxe scaling */
  ierr = PetscObjectReference((PetscObject)sub_schurs->S_Ej_all);CHKERRQ(ierr);
  deluxe_ctx->seq_mat = sub_schurs->S_Ej_all;
  if (sub_schurs->sum_S_Ej_all) { /* if this matrix is present, then we need to create the KSP object to invert it */
    PC               pc_temp;
    MatSolverPackage solver=NULL;
    char             ksp_prefix[256];
    size_t           len;

    ierr = KSPCreate(PETSC_COMM_SELF,&deluxe_ctx->seq_ksp);CHKERRQ(ierr);
    ierr = KSPSetOperators(deluxe_ctx->seq_ksp,sub_schurs->sum_S_Ej_all,sub_schurs->sum_S_Ej_all);CHKERRQ(ierr);
    ierr = KSPSetType(deluxe_ctx->seq_ksp,KSPPREONLY);CHKERRQ(ierr);
    ierr = KSPGetPC(deluxe_ctx->seq_ksp,&pc_temp);CHKERRQ(ierr);
    ierr = PCSetType(pc_temp,PCLU);CHKERRQ(ierr);
    ierr = KSPGetPC(pcbddc->ksp_D,&pc_temp);CHKERRQ(ierr);
    ierr = PCFactorGetMatSolverPackage(pc_temp,(const MatSolverPackage*)&solver);CHKERRQ(ierr);
    if (solver) {
      PC     new_pc;
      PCType type;

      ierr = PCGetType(pc_temp,&type);CHKERRQ(ierr);
      ierr = KSPGetPC(deluxe_ctx->seq_ksp,&new_pc);CHKERRQ(ierr);
      ierr = PCSetType(new_pc,type);CHKERRQ(ierr);
      ierr = PCFactorSetMatSolverPackage(new_pc,solver);CHKERRQ(ierr);
    }
    ierr = PetscStrlen(((PetscObject)(pcbddc->ksp_D))->prefix,&len);CHKERRQ(ierr);
    len -= 10; /* remove "dirichlet_" */
    ierr = PetscStrncpy(ksp_prefix,((PetscObject)(pcbddc->ksp_D))->prefix,len+1);CHKERRQ(ierr);
    ierr = PetscStrcat(ksp_prefix,"deluxe_");CHKERRQ(ierr);
    ierr = KSPSetOptionsPrefix(deluxe_ctx->seq_ksp,ksp_prefix);CHKERRQ(ierr);
    ierr = KSPSetFromOptions(deluxe_ctx->seq_ksp);CHKERRQ(ierr);
    ierr = KSPSetUp(deluxe_ctx->seq_ksp);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}
开发者ID:masa-ito，项目名称:PETScToPoisson，代码行数:59，代码来源:bddcscalingbasic.c


示例18: main

int main(int argc,char **argv)
{
    KSP            ksp;
    DM             da;
    UserContext    user;
    const char     *bcTypes[2] = {"dirichlet","neumann"};
    PetscErrorCode ierr;
    PetscInt       bc;
    Vec            b,x;

    PetscInitialize(&argc,&argv,(char *)0,help);

    ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);
    CHKERRQ(ierr);
    ierr = DMDACreate2d(PETSC_COMM_WORLD, DMDA_BOUNDARY_NONE, DMDA_BOUNDARY_NONE,DMDA_STENCIL_STAR,-3,-3,PETSC_DECIDE,PETSC_DECIDE,1,1,0,0,&da);
    CHKERRQ(ierr);
    ierr = DMDASetUniformCoordinates(da,0,1,0,1,0,0);
    CHKERRQ(ierr);
    ierr = DMDASetFieldName(da,0,"Pressure");
    CHKERRQ(ierr);

    ierr = PetscOptionsBegin(PETSC_COMM_WORLD, "", "Options for the inhomogeneous Poisson equation", "DMqq");
    user.rho    = 1.0;
    ierr        = PetscOptionsReal("-rho", "The conductivity", "ex29.c", user.rho, &user.rho, PETSC_NULL);
    CHKERRQ(ierr);
    user.nu     = 0.1;
    ierr        = PetscOptionsReal("-nu", "The width of the Gaussian source", "ex29.c", user.nu, &user.nu, PETSC_NULL);
    CHKERRQ(ierr);
    bc          = (PetscInt)DIRICHLET;
    ierr        = PetscOptionsEList("-bc_type","Type of boundary condition","ex29.c",bcTypes,2,bcTypes[0],&bc,PETSC_NULL);
    CHKERRQ(ierr);
    user.bcType = (BCType)bc;
    ierr = PetscOptionsEnd();

    ierr = KSPSetComputeRHS(ksp,ComputeRHS,&user);
    CHKERRQ(ierr);
    ierr = KSPSetComputeOperators(ksp,ComputeMatrix,&user);
    CHKERRQ(ierr);
    ierr = KSPSetDM(ksp,da);
    CHKERRQ(ierr);
    ierr = KSPSetFromOptions(ksp);
    CHKERRQ(ierr);
    ierr = KSPSetUp(ksp);
    CHKERRQ(ierr);
    ierr = KSPSolve(ksp,PETSC_NULL,PETSC_NULL);
    CHKERRQ(ierr);
    ierr = KSPGetSolution(ksp,&x);
    CHKERRQ(ierr);
    ierr = KSPGetRhs(ksp,&b);
    CHKERRQ(ierr);

    ierr = DMDestroy(&da);
    CHKERRQ(ierr);
    ierr = KSPDestroy(&ksp);
    CHKERRQ(ierr);
    ierr = PetscFinalize();

    return 0;
}
开发者ID:erdc-cm，项目名称:petsc-dev，代码行数:59，代码来源:ex29.c


示例19: KSPSetFromOptions

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

   Collective on KSP

   Input Parameter:
.  ksp - the KSP context

   Level: beginner

.keywords: KSP, linear, set, options, database

.seealso: KSPSetFromOptions(), KSPSetOptionsPrefix()
@*/
PetscErrorCode KSPResetFromOptions(KSP ksp)
{
  PetscErrorCode ierr;

  PetscFunctionBegin;
  if (ksp->setfromoptionscalled) {ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);}
  PetscFunctionReturn(0);
}
开发者ID:petsc，项目名称:petsc，代码行数:22，代码来源:itcl.c


示例20: PCSetFromOptions_Redistribute

static PetscErrorCode PCSetFromOptions_Redistribute(PC pc)
{
  PetscErrorCode  ierr;
  PC_Redistribute *red = (PC_Redistribute*)pc->data;

  PetscFunctionBegin;
  ierr = KSPSetFromOptions(red->ksp);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}
开发者ID:erdc-cm，项目名称:petsc-dev，代码行数:9，代码来源:redistribute.c



注：本文中的KSPSetFromOptions函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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