Hello, I want to monitor the convergence of the KSP-solver, i.e. plot the number of iterations vs. the error/residual norm.
I discovered the options -ksp_monitor_draw_true_residual and -ksp_monitor_true_residual. Now the questions: What does the grafical output of -ksp_monitor_draw_true_residual represent? I see the iteration count at the x-axis and expected the norm of the residual at the y-axis, and some scaled value at the y-axis. Is this the logarithm of the residual/which residual? If I output to .ps, I get overlayed the steps and don't see anything useful at the end. Is there a way to extract only the last picture? Is there an easy (without hacking the PETSc sources) way to output a customized convergence monitoring line like -ksp_monitor_true_residual at every step? Cheers, ando -- /"\ Grassl Andreas \ / ASCII Ribbon Campaign Uni Innsbruck Institut f. Mathematik X against HTML email Technikerstr. 13 Zi 709 / \ +43 (0)512 507 6091
