Hi everyone,
I want to use the Left Preconditioned GMRES to solve a linear system, and the
stopping criterion must be based on the actual residuals (b-Ax). But the
GMRES codes of PETSc seems to use the preconditioned residuals (B^-1(b-Ax))
only. In addition, when I set KSPSetNormType(ksp,KSP_NORM_UNPRECONDITIONED), I
receive the error message: "Currently can use GMRES with only preconditioned
residual (right preconditioning not coded)". So, is there any way to set
stopping criterion based on the actual residuals?
Best regards,
Jiaxun
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