Date: 2018-10-23T10:31:13+00:00

Actual source code: krylovschur.h
slepc-3.10.1 2018-10-23
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-2018, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.
      7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
      8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      9: */
     10: /*
     11:    Private header for Krylov-Schur
     12: */

     17: PETSC_INTERN PetscErrorCode EPSReset_KrylovSchur_Slice(EPS);
     18: PETSC_INTERN PetscErrorCode EPSSolve_KrylovSchur_Default(EPS);
     19: PETSC_INTERN PetscErrorCode EPSSolve_KrylovSchur_Symm(EPS);
     20: PETSC_INTERN PetscErrorCode EPSSolve_KrylovSchur_Slice(EPS);
     21: PETSC_INTERN PetscErrorCode EPSSetUp_KrylovSchur_Slice(EPS);
     22: PETSC_INTERN PetscErrorCode EPSSolve_KrylovSchur_Indefinite(EPS);
     23: PETSC_INTERN PetscErrorCode EPSGetArbitraryValues(EPS,PetscScalar*,PetscScalar*);

     25: /* Structure characterizing a shift in spectrum slicing */
     26: typedef struct _n_shift *EPS_shift;
     27: struct _n_shift {
     28:   PetscReal     value;
     29:   PetscInt      inertia;
     30:   PetscBool     comp[2];      /* Shows completion of subintervals (left and right) */
     31:   EPS_shift     neighb[2];    /* Adjacent shifts */
     32:   PetscInt      index;        /* Index in eig where found values are stored */
     33:   PetscInt      neigs;        /* Number of values found */
     34:   PetscReal     ext[2];       /* Limits for accepted values */
     35:   PetscInt      nsch[2];      /* Number of missing values for each subinterval */
     36:   PetscInt      nconv[2];     /* Converged on each side (accepted or not) */
     37: };

     39: /* Structure for storing the state of spectrum slicing */
     40: struct _n_SR {
     41:   PetscReal     int0,int1;    /* Extremes of the interval */
     42:   PetscInt      dir;          /* Determines the order of values in eig (+1 incr, -1 decr) */
     43:   PetscBool     hasEnd;       /* Tells whether the interval has an end */
     44:   PetscInt      inertia0,inertia1;
     45:   PetscScalar   *back;
     46:   PetscInt      numEigs;      /* Number of eigenvalues in the interval */
     47:   PetscInt      indexEig;
     48:   EPS_shift     sPres;        /* Present shift */
     49:   EPS_shift     *pending;     /* Pending shifts array */
     50:   PetscInt      nPend;        /* Number of pending shifts */
     51:   PetscInt      maxPend;      /* Size of "pending" array */
     52:   PetscInt      *idxDef;      /* For deflation */
     53:   PetscInt      nMAXCompl;
     54:   PetscInt      iterCompl;
     55:   PetscInt      itsKs;        /* Krylovschur restarts */
     56:   PetscInt      nleap;
     57:   EPS_shift     s0;           /* Initial shift */
     58:   PetscScalar   *S;           /* Matrix for projected problem */
     59:   PetscInt      nS;
     60:   EPS_shift     sPrev;
     61:   PetscInt      nv;           /* position of restart vector */
     62:   BV            V;            /* working basis (for subsolve) */
     63:   BV            Vnext;        /* temporary working basis during change of shift */
     64:   PetscScalar   *eigr,*eigi;  /* eigenvalues (for subsolve) */
     65:   PetscReal     *errest;      /* error estimates (for subsolve) */
     66:   PetscInt      *perm;        /* permutation (for subsolve) */
     67: };
     68: typedef struct _n_SR *EPS_SR;

     70: typedef struct {
     71:   PetscReal        keep;               /* restart parameter */
     72:   PetscBool        lock;               /* locking/non-locking variant */
     73:   /* the following are used only in spectrum slicing */
     74:   EPS_SR           sr;                 /* spectrum slicing context */
     75:   PetscInt         nev;                /* number of eigenvalues to compute */
     76:   PetscInt         ncv;                /* number of basis vectors */
     77:   PetscInt         mpd;                /* maximum dimension of projected problem */
     78:   PetscInt         npart;              /* number of partitions of subcommunicator */
     79:   PetscBool        detect;             /* check for zeros during factorizations */
     80:   PetscReal        *subintervals;      /* partition of global interval */
     81:   PetscBool        subintset;          /* subintervals set by user */
     82:   PetscMPIInt      *nconv_loc;         /* converged eigenpairs for each subinterval */
     83:   EPS              eps;                /* additional eps for slice runs */
     84:   PetscBool        global;             /* flag distinguishing global from local eps */
     85:   PetscReal        *shifts;            /* array containing global shifts */
     86:   PetscInt         *inertias;          /* array containing global inertias */
     87:   PetscInt         nshifts;            /* elements in the arrays of shifts and inertias */
     88:   PetscSubcomm     subc;               /* context for subcommunicators */
     89:   MPI_Comm         commrank;           /* group processes with same rank in subcommunicators */
     90:   PetscBool        commset;            /* flag indicating that commrank was created */
     91:   PetscObjectState Astate,Bstate;      /* state of subcommunicator matrices */
     92:   PetscObjectId    Aid,Bid;            /* Id of subcommunicator matrices */
     93:   IS               isrow,iscol;        /* index sets used in update of subcomm mats */
     94:   Mat              *submata,*submatb;  /* seq matrices used in update of subcomm mats */
     95: } EPS_KRYLOVSCHUR;

     97: #endif