1 #ifndef _SNESNGMRES_H 2 #define _SNESNGMRES_H 3 4 #include <private/snesimpl.h> 5 6 /* Data structure for the Nonlinear GMRES method. */ 7 typedef struct { 8 9 /* Solver parameters and counters */ 10 PetscInt msize; /* maximum size of krylov space */ 11 PetscInt restart_it; /* number of iterations the restart conditions persist before restart */ 12 PetscViewer monitor; /* debugging output for NGMRES */ 13 14 /* History and subspace data */ 15 Vec *Fdot; /* residual history -- length msize */ 16 Vec *Xdot; /* solution history -- length msize */ 17 PetscReal *fnorms; /* the residual norm history */ 18 19 /* General minimization problem context */ 20 PetscScalar *h; /* the constraint matrix */ 21 PetscScalar *beta; /* rhs for the minimization problem */ 22 PetscScalar *xi; /* the dot-product of the current and previous res. */ 23 24 /* Line searches */ 25 SNESLineSearch additive_linesearch; /* Line search for the additive variant */ 26 27 /* Selection constants */ 28 PetscBool anderson; /* use anderson-mixing approach */ 29 PetscBool additive; /* use additive variant instead of selection */ 30 PetscReal gammaA; /* Criterion A residual tolerance */ 31 PetscReal epsilonB; /* Criterion B difference tolerance */ 32 PetscReal deltaB; /* Criterion B residual tolerance */ 33 PetscReal gammaC; /* Restart residual tolerance */ 34 35 /* Least squares minimization solve context */ 36 PetscScalar *q; /* the matrix formed as q_ij = (rdot_i, rdot_j) */ 37 PetscBLASInt m; /* matrix dimension */ 38 PetscBLASInt n; /* matrix dimension */ 39 PetscBLASInt nrhs; /* the number of right hand sides */ 40 PetscBLASInt lda; /* the padded matrix dimension */ 41 PetscBLASInt ldb; /* the padded vector dimension */ 42 PetscReal *s; /* the singular values */ 43 PetscReal rcond; /* the exit condition */ 44 PetscBLASInt rank; /* the effective rank */ 45 PetscScalar *work; /* the work vector */ 46 PetscReal *rwork; /* the real work vector used for complex */ 47 PetscBLASInt lwork; /* the size of the work vector */ 48 PetscBLASInt info; /* the output condition */ 49 50 PetscBool setup_called; /* indicates whether SNESSetUp_NGMRES() has been called */ 51 } SNES_NGMRES; 52 53 #define H(i,j) ngmres->h[i*ngmres->msize + j] 54 #define Q(i,j) ngmres->q[i*ngmres->msize + j] 55 56 #endif 57