PetscErrorCode SolveH(MPI_Comm comm, KSP ksp, Mat H, Vec rhs, Vec sol)
{
/*-----------------KSP Solving------------------*/
PetscErrorCode ierr;
PetscLogDouble t1,t2,tpast;
ierr = Ptime(&t1);CHKERRQ(ierr);
if (itsH>(maxit-5)){
ierr = KSPSetOperators(ksp,H,H);CHKERRQ(ierr);}
else{
ierr = KSPSetReusePreconditioner(ksp,PETSC_TRUE);CHKERRQ(ierr);}
ierr = KSPSolve(ksp,rhs,sol);CHKERRQ(ierr);
ierr = KSPGetIterationNumber(ksp,&itsH);CHKERRQ(ierr);
// if GMRES is stopped due to maxit, then redo it with sparse direct solve;
if(itsH>(maxit-2))
{
ierr = KSPSetOperators(ksp,H,H);CHKERRQ(ierr);
ierr = KSPSolve(ksp,rhs,sol);CHKERRQ(ierr);
ierr = KSPGetIterationNumber(ksp,&itsH);CHKERRQ(ierr);
}
//Print kspsolving information
double norm;
Vec xdiff;
ierr=VecDuplicate(sol,&xdiff);CHKERRQ(ierr);
ierr = MatMult(H,sol, xdiff);CHKERRQ(ierr);
ierr = VecAXPY(xdiff,-1.0,rhs);CHKERRQ(ierr);
ierr = VecNorm(xdiff,NORM_INFINITY,&norm);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"==> Helmholtz filter solution: norm of error %g, Kryolv Iterations %d----\n ",norm,itsH);CHKERRQ(ierr);
ierr = Ptime(&t2);CHKERRQ(ierr);
tpast = t2 - t1;
int rank;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
if(rank==0) PetscPrintf(PETSC_COMM_SELF,"==> Helmholtz filter solution: the runing time is %f s \n",tpast);
/*--------------Finish KSP Solving---------------*/
VecDestroy(&xdiff);
PetscFunctionReturn(0);
}
//
//Turn LED ON*************************************************************
//
int LEDon(){
//Turns LED on
//Open LED file
LEDfile = fopen("/sys/class/gpio/gpio49/value","w");
//Set LED variable to on
LED = 1;
//Write to LED file
fprintf(LEDfile, "%d", LED);
//Close LED file
fclose(LEDfile);
//Call Ptime to print the time
Ptime();
return 0;
}
//
//Toggle LED
//
int TLED(){
//Toggle LED
LEDfile = fopen("/sys/class/gpio/gpio49/value","r");
fscanf(LEDfile, "%d", &LED);
//Close file
fclose(LEDfile);
//if LED is on, turn off
if(LED == 1){
LEDoff();
}
//else turn LED on
else{
LEDon();
}
//Call Ptime to print the time
Ptime();
return 0;
}