HYPRE_Int
hypre_SStructPMatvec( HYPRE_Complex alpha,
hypre_SStructPMatrix *pA,
hypre_SStructPVector *px,
HYPRE_Complex beta,
hypre_SStructPVector *py )
{
void *pmatvec_data;
hypre_SStructPMatvecCreate(&pmatvec_data);
hypre_SStructPMatvecSetup(pmatvec_data, pA, px);
hypre_SStructPMatvecCompute(pmatvec_data, alpha, pA, px, beta, py);
hypre_SStructPMatvecDestroy(pmatvec_data);
return hypre_error_flag;
}
HYPRE_Int
hypre_SysPFMGSolve( void *sys_pfmg_vdata,
hypre_SStructMatrix *A_in,
hypre_SStructVector *b_in,
hypre_SStructVector *x_in )
{
hypre_SysPFMGData *sys_pfmg_data = sys_pfmg_vdata;
hypre_SStructPMatrix *A;
hypre_SStructPVector *b;
hypre_SStructPVector *x;
double tol = (sys_pfmg_data -> tol);
HYPRE_Int max_iter = (sys_pfmg_data -> max_iter);
HYPRE_Int rel_change = (sys_pfmg_data -> rel_change);
HYPRE_Int zero_guess = (sys_pfmg_data -> zero_guess);
HYPRE_Int num_pre_relax = (sys_pfmg_data -> num_pre_relax);
HYPRE_Int num_post_relax = (sys_pfmg_data -> num_post_relax);
HYPRE_Int num_levels = (sys_pfmg_data -> num_levels);
hypre_SStructPMatrix **A_l = (sys_pfmg_data -> A_l);
hypre_SStructPMatrix **P_l = (sys_pfmg_data -> P_l);
hypre_SStructPMatrix **RT_l = (sys_pfmg_data -> RT_l);
hypre_SStructPVector **b_l = (sys_pfmg_data -> b_l);
hypre_SStructPVector **x_l = (sys_pfmg_data -> x_l);
hypre_SStructPVector **r_l = (sys_pfmg_data -> r_l);
hypre_SStructPVector **e_l = (sys_pfmg_data -> e_l);
void **relax_data_l = (sys_pfmg_data -> relax_data_l);
void **matvec_data_l = (sys_pfmg_data -> matvec_data_l);
void **restrict_data_l = (sys_pfmg_data -> restrict_data_l);
void **interp_data_l = (sys_pfmg_data -> interp_data_l);
HYPRE_Int logging = (sys_pfmg_data -> logging);
double *norms = (sys_pfmg_data -> norms);
double *rel_norms = (sys_pfmg_data -> rel_norms);
HYPRE_Int *active_l = (sys_pfmg_data -> active_l);
double b_dot_b, r_dot_r, eps;
double e_dot_e, x_dot_x;
HYPRE_Int i, l;
HYPRE_Int ierr = 0;
#if DEBUG
char filename[255];
#endif
/*-----------------------------------------------------
* Initialize some things and deal with special cases
*-----------------------------------------------------*/
hypre_BeginTiming(sys_pfmg_data -> time_index);
/*-----------------------------------------------------
* Refs to A,x,b (the PMatrix & PVectors within
* the input SStructMatrix & SStructVectors)
*-----------------------------------------------------*/
hypre_SStructPMatrixRef(hypre_SStructMatrixPMatrix(A_in, 0), &A);
hypre_SStructPVectorRef(hypre_SStructVectorPVector(b_in, 0), &b);
hypre_SStructPVectorRef(hypre_SStructVectorPVector(x_in, 0), &x);
hypre_SStructPMatrixDestroy(A_l[0]);
hypre_SStructPVectorDestroy(b_l[0]);
hypre_SStructPVectorDestroy(x_l[0]);
hypre_SStructPMatrixRef(A, &A_l[0]);
hypre_SStructPVectorRef(b, &b_l[0]);
hypre_SStructPVectorRef(x, &x_l[0]);
(sys_pfmg_data -> num_iterations) = 0;
/* if max_iter is zero, return */
if (max_iter == 0)
{
/* if using a zero initial guess, return zero */
if (zero_guess)
{
hypre_SStructPVectorSetConstantValues(x, 0.0);
}
hypre_EndTiming(sys_pfmg_data -> time_index);
return ierr;
}
/* part of convergence check */
if (tol > 0.0)
{
/* eps = (tol^2) */
hypre_SStructPInnerProd(b_l[0], b_l[0], &b_dot_b);
eps = tol*tol;
/* if rhs is zero, return a zero solution */
if (b_dot_b == 0.0)
{
hypre_SStructPVectorSetConstantValues(x, 0.0);
if (logging > 0)
{
norms[0] = 0.0;
rel_norms[0] = 0.0;
}
hypre_EndTiming(sys_pfmg_data -> time_index);
return ierr;
}
}
/*-----------------------------------------------------
* Do V-cycles:
* For each index l, "fine" = l, "coarse" = (l+1)
*-----------------------------------------------------*/
for (i = 0; i < max_iter; i++)
{
/*--------------------------------------------------
* Down cycle
*--------------------------------------------------*/
/* fine grid pre-relaxation */
hypre_SysPFMGRelaxSetPreRelax(relax_data_l[0]);
hypre_SysPFMGRelaxSetMaxIter(relax_data_l[0], num_pre_relax);
hypre_SysPFMGRelaxSetZeroGuess(relax_data_l[0], zero_guess);
hypre_SysPFMGRelax(relax_data_l[0], A_l[0], b_l[0], x_l[0]);
zero_guess = 0;
/* compute fine grid residual (b - Ax) */
hypre_SStructPCopy(b_l[0], r_l[0]);
hypre_SStructPMatvecCompute(matvec_data_l[0],
-1.0, A_l[0], x_l[0], 1.0, r_l[0]);
/* convergence check */
if (tol > 0.0)
{
hypre_SStructPInnerProd(r_l[0], r_l[0], &r_dot_r);
if (logging > 0)
{
norms[i] = sqrt(r_dot_r);
if (b_dot_b > 0)
rel_norms[i] = sqrt(r_dot_r/b_dot_b);
else
rel_norms[i] = 0.0;
}
/* always do at least 1 V-cycle */
if ((r_dot_r/b_dot_b < eps) && (i > 0))
{
if (rel_change)
{
if ((e_dot_e/x_dot_x) < eps)
break;
}
else
{
break;
}
}
}
if (num_levels > 1)
{
/* restrict fine grid residual */
hypre_SysSemiRestrict(restrict_data_l[0], RT_l[0], r_l[0], b_l[1]);
#if DEBUG
hypre_sprintf(filename, "zout_xdown.%02d", 0);
hypre_SStructPVectorPrint(filename, x_l[0], 0);
hypre_sprintf(filename, "zout_rdown.%02d", 0);
hypre_SStructPVectorPrint(filename, r_l[0], 0);
hypre_sprintf(filename, "zout_b.%02d", 1);
hypre_SStructPVectorPrint(filename, b_l[1], 0);
#endif
for (l = 1; l <= (num_levels - 2); l++)
{
if (active_l[l])
{
/* pre-relaxation */
hypre_SysPFMGRelaxSetPreRelax(relax_data_l[l]);
hypre_SysPFMGRelaxSetMaxIter(relax_data_l[l], num_pre_relax);
hypre_SysPFMGRelaxSetZeroGuess(relax_data_l[l], 1);
hypre_SysPFMGRelax(relax_data_l[l], A_l[l], b_l[l], x_l[l]);
/* compute residual (b - Ax) */
hypre_SStructPCopy(b_l[l], r_l[l]);
hypre_SStructPMatvecCompute(matvec_data_l[l],
-1.0, A_l[l], x_l[l], 1.0, r_l[l]);
}
else
{
/* inactive level, set x=0, so r=(b-Ax)=b */
hypre_SStructPVectorSetConstantValues(x_l[l], 0.0);
hypre_SStructPCopy(b_l[l], r_l[l]);
}
/* restrict residual */
hypre_SysSemiRestrict(restrict_data_l[l],
RT_l[l], r_l[l], b_l[l+1]);
#if DEBUG
hypre_sprintf(filename, "zout_xdown.%02d", l);
hypre_SStructPVectorPrint(filename, x_l[l], 0);
hypre_sprintf(filename, "zout_rdown.%02d", l);
hypre_SStructPVectorPrint(filename, r_l[l], 0);
hypre_sprintf(filename, "zout_b.%02d", l+1);
hypre_SStructPVectorPrint(filename, b_l[l+1], 0);
#endif
}
/*--------------------------------------------------
* Bottom
*--------------------------------------------------*/
hypre_SysPFMGRelaxSetZeroGuess(relax_data_l[l], 1);
hypre_SysPFMGRelax(relax_data_l[l], A_l[l], b_l[l], x_l[l]);
#if DEBUG
hypre_sprintf(filename, "zout_xbottom.%02d", l);
hypre_SStructPVectorPrint(filename, x_l[l], 0);
#endif
/*--------------------------------------------------
* Up cycle
*--------------------------------------------------*/
for (l = (num_levels - 2); l >= 1; l--)
{
/* interpolate error and correct (x = x + Pe_c) */
hypre_SysSemiInterp(interp_data_l[l], P_l[l], x_l[l+1], e_l[l]);
hypre_SStructPAxpy(1.0, e_l[l], x_l[l]);
#if DEBUG
hypre_sprintf(filename, "zout_eup.%02d", l);
hypre_SStructPVectorPrint(filename, e_l[l], 0);
hypre_sprintf(filename, "zout_xup.%02d", l);
hypre_SStructPVectorPrint(filename, x_l[l], 0);
#endif
if (active_l[l])
{
/* post-relaxation */
hypre_SysPFMGRelaxSetPostRelax(relax_data_l[l]);
hypre_SysPFMGRelaxSetMaxIter(relax_data_l[l], num_post_relax);
hypre_SysPFMGRelaxSetZeroGuess(relax_data_l[l], 0);
hypre_SysPFMGRelax(relax_data_l[l], A_l[l], b_l[l], x_l[l]);
}
}
/* interpolate error and correct on fine grid (x = x + Pe_c) */
hypre_SysSemiInterp(interp_data_l[0], P_l[0], x_l[1], e_l[0]);
hypre_SStructPAxpy(1.0, e_l[0], x_l[0]);
#if DEBUG
hypre_sprintf(filename, "zout_eup.%02d", 0);
hypre_SStructPVectorPrint(filename, e_l[0], 0);
hypre_sprintf(filename, "zout_xup.%02d", 0);
hypre_SStructPVectorPrint(filename, x_l[0], 0);
#endif
}
/* part of convergence check */
if ((tol > 0.0) && (rel_change))
{
if (num_levels > 1)
{
hypre_SStructPInnerProd(e_l[0], e_l[0], &e_dot_e);
hypre_SStructPInnerProd(x_l[0], x_l[0], &x_dot_x);
}
else
{
e_dot_e = 0.0;
x_dot_x = 1.0;
}
}
/* fine grid post-relaxation */
hypre_SysPFMGRelaxSetPostRelax(relax_data_l[0]);
hypre_SysPFMGRelaxSetMaxIter(relax_data_l[0], num_post_relax);
hypre_SysPFMGRelaxSetZeroGuess(relax_data_l[0], 0);
hypre_SysPFMGRelax(relax_data_l[0], A_l[0], b_l[0], x_l[0]);
(sys_pfmg_data -> num_iterations) = (i + 1);
}
/*-----------------------------------------------------
* Destroy Refs to A,x,b (the PMatrix & PVectors within
* the input SStructMatrix & SStructVectors).
*-----------------------------------------------------*/
hypre_SStructPMatrixDestroy(A);
hypre_SStructPVectorDestroy(x);
hypre_SStructPVectorDestroy(b);
hypre_EndTiming(sys_pfmg_data -> time_index);
return ierr;
}
HYPRE_Int
hypre_SStructMatvecCompute( void *matvec_vdata,
HYPRE_Complex alpha,
hypre_SStructMatrix *A,
hypre_SStructVector *x,
HYPRE_Complex beta,
hypre_SStructVector *y )
{
hypre_SStructMatvecData *matvec_data = matvec_vdata;
HYPRE_Int nparts = (matvec_data -> nparts);
void **pmatvec_data = (matvec_data -> pmatvec_data);
void *pdata;
hypre_SStructPMatrix *pA;
hypre_SStructPVector *px;
hypre_SStructPVector *py;
hypre_ParCSRMatrix *parcsrA = hypre_SStructMatrixParCSRMatrix(A);
hypre_ParVector *parx;
hypre_ParVector *pary;
HYPRE_Int part;
HYPRE_Int x_object_type= hypre_SStructVectorObjectType(x);
HYPRE_Int A_object_type= hypre_SStructMatrixObjectType(A);
if (x_object_type != A_object_type)
{
hypre_error_in_arg(2);
hypre_error_in_arg(3);
return hypre_error_flag;
}
if ( (x_object_type == HYPRE_SSTRUCT) || (x_object_type == HYPRE_STRUCT) )
{
/* do S-matrix computations */
for (part = 0; part < nparts; part++)
{
pdata = pmatvec_data[part];
pA = hypre_SStructMatrixPMatrix(A, part);
px = hypre_SStructVectorPVector(x, part);
py = hypre_SStructVectorPVector(y, part);
hypre_SStructPMatvecCompute(pdata, alpha, pA, px, beta, py);
}
if (x_object_type == HYPRE_SSTRUCT)
{
/* do U-matrix computations */
/* GEC1002 the data chunk pointed by the local-parvectors
* inside the semistruct vectors x and y is now identical to the
* data chunk of the structure vectors x and y. The role of the function
* convert is to pass the addresses of the data chunk
* to the parx and pary. */
hypre_SStructVectorConvert(x, &parx);
hypre_SStructVectorConvert(y, &pary);
hypre_ParCSRMatrixMatvec(alpha, parcsrA, parx, 1.0, pary);
/* dummy functions since there is nothing to restore */
hypre_SStructVectorRestore(x, NULL);
hypre_SStructVectorRestore(y, pary);
parx = NULL;
}
}
else if (x_object_type == HYPRE_PARCSR)
{
hypre_SStructVectorConvert(x, &parx);
hypre_SStructVectorConvert(y, &pary);
hypre_ParCSRMatrixMatvec(alpha, parcsrA, parx, beta, pary);
hypre_SStructVectorRestore(x, NULL);
hypre_SStructVectorRestore(y, pary);
parx = NULL;
}
return hypre_error_flag;
}
