[petsc-users] PetscOptionsSetValue syntax

[Karthikeyan Chockalingam - STFC UKRI]

Thank you. It worked!

Best,
Karthik.

From: Pierre Jolivet <pierre at joliv.et>
Date: Friday, 18 November 2022 at 13:56
To: Chockalingam, Karthikeyan (STFC,DL,HC) <karthikeyan.chockalingam at stfc.ac.uk>
Cc: petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
Subject: Re: [petsc-users] PetscOptionsSetValue syntax



On 18 Nov 2022, at 2:47 PM, Karthikeyan Chockalingam - STFC UKRI <karthikeyan.chockalingam at stfc.ac.uk> wrote:

Thank you. I added

    ierr = KSPSetFromOptions(ksp); CHKERRQ(ierr);

before PetscOptionsSetValue but still I don’t see the ksp iterations or any other info flags I set.
I am not passing anything via the command line and believe PetscOptionsSetValue would set the flags.

If you call KSPSetFromOptions() before you set any options, there is nothing to set.
Usually, you want to delay calling that function up until you are done setting options.

Thanks,
Pierre


Best,
Karthik.


From: Pierre Jolivet <pierre at joliv.et>
Date: Friday, 18 November 2022 at 13:36
To: Chockalingam, Karthikeyan (STFC,DL,HC) <karthikeyan.chockalingam at stfc.ac.uk>
Cc: petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
Subject: Re: [petsc-users] PetscOptionsSetValue syntax


On 18 Nov 2022, at 2:32 PM, Karthikeyan Chockalingam - STFC UKRI via petsc-users <petsc-users at mcs.anl.gov> wrote:

Hello,

I would like to move from code to using options.

   KSP           ksp;
    PC            pc;
    KSPCreate(PETSC_COMM_WORLD, &ksp);
    KSPSetOperators(ksp, A, A);

I tried using PetscOptionsSetValue as below


    ierr = PetscOptionsSetValue(NULL,"-ksp_type", "cg"); CHKERRQ(ierr);

    ierr = PetscOptionsSetValue(NULL,"-pc_type", "jacobi"); CHKERRQ(ierr);

    ierr = PetscOptionsSetValue(NULL, "-ksp_monitor", NULL);CHKERRQ(ierr);

    ierr = PetscOptionsSetValue(NULL, "-ksp_view", NULL);CHKERRQ(ierr);

    ierr = PetscOptionsSetValue(NULL, "-ksp_monitor_true_residual", NULL);CHKERRQ(ierr);

    ierr = PetscOptionsSetValue(NULL, "-ksp_converged_reason", NULL);CHKERRQ(ierr);



    KSPSolve(ksp, b, x);

But I believe none of the string flags where picked up by PETSc. What am I missing?

KSPSetFromOptions()

Thanks,
Pierre



Thank you for your help.

Kind regards,
Karthik.

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