[petsc-users] Preconditioned BiCGStab in PETSC, formulas

[Jed Brown]

Kirill Voronin <kvoronin at labchem.sscc.ru> writes:
> But looking at
> http://www.mcs.anl.gov/petsc/petsc-current/src/ksp/ksp/impls/bcgs/bcgs.c,
> I see that there should be two for each iteration of do loop.
> Can this 3-d call happen due to the monitoring routines?

Yes, -ksp_monitor_true_residual computes the true residual explicitly
instead of via the recurrence.

> Actually I run code with -ksp_monitor_max -ksp_monitor_true_residual and
> -ksp_monitor,
> with additional monitor routine which calls KSPBuildResidual() and then
> computes in NORM_1.

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