[petsc-users] monitoring the convergence of fieldsplit 0 and 1

[Klaij, Christiaan]

A question when using PCFieldSplit: for each linear iteration of
the system, how many iterations for fielsplit 0 and 1?

One way to find out is to run with -ksp_monitor,
-fieldsplit_0_ksp_monitor and -fieldsplit_0_ksp_monitor. This
gives the complete convergence history.

Another way, suggested by Matt, is to use -ksp_monitor,
-fieldsplit_0_ksp_converged_reason and
-fieldsplit_1_ksp_converged_reason. This gives only the totals
for fieldsplit 0 and 1 (but without saying for which one).

Both ways require to somehow process the output, which is a bit
inconvenient. Could KSPGetResidualHistory perhaps return (some)
information on the subsystems' convergence for processing inside
the code?

Chris


dr. ir. Christiaan Klaij
CFD Researcher
Research & Development
E mailto:C.Klaij at marin.nl
T +31 317 49 33 44


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