11-10-2014 02

[GMRES2stage.git] / code / ex45.c

diff --git a/code/ex45.c b/code/ex45.c
index a44a2d09174416a6ae6d2a08056a78d5770b4126..d3e5fb426ddf1f59f735f93f5b71c3bdb066229f 100644 (file)
--- a/code/ex45.c
+++ b/code/ex45.c
@@ -44,8 +44,8 @@ int KrylovMinimize(Mat A, Vec b, Vec x) {
   //Variables
 
   PetscScalar  gamma, alpha, oldgamma, beta;
-  PetscReal norm=20, Eprecision=5e-5, cgprec=1e-40;     
-  PetscInt giter=0, ColS=12, col=0, Emaxiter=50000000, iter=0, iterations=15, Iiter=0;
+  PetscReal norm=20, Eprecision=1e-8, cgprec=1e-40;     
+  PetscInt giter=0, ColS=6, col=0, Emaxiter=50000000, iter=0, iterations=15, Iiter=0;
   PetscErrorCode ierr;
   PetscScalar T1, T2;
   KSP ksp;
@@ -108,13 +108,14 @@ int KrylovMinimize(Mat A, Vec b, Vec x) {
 
   //Initializations
   //  ierr = KSPGMRESSetRestart(ksp, 16); CHKERRQ(ierr);
-  ierr = KSPSetTolerances(ksp, 1e-10, 1e-10, PETSC_DEFAULT, 16); CHKERRQ(ierr);
+  ierr = KSPSetTolerances(ksp, 1e-13, 1e-13, PETSC_DEFAULT, 30); CHKERRQ(ierr);
   ierr = KSPSetInitialGuessNonzero(ksp, PETSC_TRUE); CHKERRQ(ierr);
 
 
 
   //GMRES WITH MINIMIZATION
   T1 = MPI_Wtime();
+  ierr = KSPSetUp(ksp);CHKERRQ(ierr);
   while(giter<Emaxiter && norm>Eprecision ){
     for(col=0; col<ColS  &&  norm>Eprecision; col++){
 
@@ -134,11 +135,12 @@ int KrylovMinimize(Mat A, Vec b, Vec x) {
 
 
 
-      //Error
+      KSPGetResidualNorm(ksp,&norm);
+      /*      //Error
       ierr = VecCopy(x, residu); CHKERRQ(ierr);
       ierr = VecAXPY(residu, -1, x_old); CHKERRQ(ierr);
       ierr = VecNorm(residu, NORM_INFINITY, &norm); CHKERRQ(ierr);
-
+       */
 
 
       ierr = PetscPrintf(PETSC_COMM_WORLD, "Norm of error %g, outer iteration %D\n", norm, giter); CHKERRQ(ierr);
@@ -219,8 +221,8 @@ int KrylovMinimizeLSQR(Mat A, Vec b, Vec x) {
   //Variables
 
   PetscScalar  alpha, beta;
-  PetscReal norm=20, Eprecision=5e-5, tol=1e-40;     
-  PetscInt giter=0, ColS=12, col=0, Emaxiter=50000000, iter=0, iterations=15, Iiter=0;
+  PetscReal norm=20, Eprecision=1e-8, tol=1e-40;     
+  PetscInt giter=0, ColS=6, col=0, Emaxiter=50000000, iter=0, iterations=15, Iiter=0;
   PetscErrorCode ierr;
   PetscScalar T1, T2;
   KSP ksp;
@@ -296,7 +298,7 @@ int KrylovMinimizeLSQR(Mat A, Vec b, Vec x) {
 
   //Initializations
   //  ierr = KSPGMRESSetRestart(ksp, 16); CHKERRQ(ierr);
-  ierr = KSPSetTolerances(ksp, 1e-10, 1e-10, PETSC_DEFAULT, 16); CHKERRQ(ierr);
+  ierr = KSPSetTolerances(ksp, 1e-13, 1e-13, PETSC_DEFAULT, 30); CHKERRQ(ierr);
   ierr = KSPSetInitialGuessNonzero(ksp, PETSC_TRUE); CHKERRQ(ierr);
 
 
@@ -304,6 +306,7 @@ int KrylovMinimizeLSQR(Mat A, Vec b, Vec x) {
 
   //GMRES WITH MINIMIZATION
   T1 = MPI_Wtime();
+  ierr = KSPSetUp(ksp);CHKERRQ(ierr);
   while(giter<Emaxiter && norm>Eprecision ){
     for(col=0; col<ColS  &&  norm>Eprecision; col++){
 
@@ -322,12 +325,14 @@ int KrylovMinimizeLSQR(Mat A, Vec b, Vec x) {
       VecRestoreArray(x, &array);
 
 
+      KSPGetResidualNorm(ksp,&norm);
 
+        /*
       //Error
       ierr = VecCopy(x, residu); CHKERRQ(ierr);
       ierr = VecAXPY(residu, -1, x_old); CHKERRQ(ierr);
       ierr = VecNorm(residu, NORM_INFINITY, &norm); CHKERRQ(ierr);
-
+         */
 
 
       ierr = PetscPrintf(PETSC_COMM_WORLD, "Norm of error %g, outer iteration %D\n", norm, giter); CHKERRQ(ierr);
@@ -408,14 +413,6 @@ int KrylovMinimizeLSQR(Mat A, Vec b, Vec x) {
         VecAYPX(d,1/rho,zero_short);     //d=d/ rho;
 
 
-        if (normar/(norma*normr) <= tol) { // check for convergence in min{|b-A*x|}
-          break;
-        }
-        if (normr <= tolb) {           // check for convergence in A*x=b
-          break;
-        }
-
-
         VecAXPY(x_lsqr,phi,d);     // x_lsqr=x_lsqr+phi*d
         normr = abs(s) * normr;
         MatMultTranspose(AS, u, vt); //vt=A'*u;
@@ -471,8 +468,22 @@ int main(int argc,char **argv)
   ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
 
 
-  ierr = KSPSetTolerances(ksp, 1e-7, 1e-7, PETSC_DEFAULT, 50000000); CHKERRQ(ierr);
+
+  PC             pc;
+  ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
+  KSPGetPC(ksp, &pc);
+  PCType         type;
+  PCGetType(pc, &type);
+
+  PetscPrintf(PETSC_COMM_WORLD, "PC TYPE %s  \n", type);
+  KSPGetType(ksp,&type);
+  PetscPrintf(PETSC_COMM_WORLD, "SOLVER TYPE %s  \n", type);
+
+
+
+  ierr = KSPSetTolerances(ksp, 1e-10, 1e-10, PETSC_DEFAULT, 50000000); CHKERRQ(ierr);
   T1 = MPI_Wtime();
+  ierr = KSPSetUp(ksp);CHKERRQ(ierr);
   ierr = KSPSolve(ksp,NULL,NULL);CHKERRQ(ierr);
   T2 = MPI_Wtime();