Compare to the initial residual. It should be obvious if you run with -ksp_monitor_true_residual
On Tue, Jan 8, 2013 at 7:36 AM, w_ang_temp <w_ang_temp at 163.com> wrote: > Hello, > > I use the default dtol(1.0E+5), in my view, only when residual norm is > greater than > > dtol, the DIVERGED_DTOL occurs(||rk||>dtol*||b||). But in my project, it > is not. The information is: > > 349 KSP Residual norm 3.697892503779e-01 > 350 KSP Residual norm 1.104685840662e+02 > 351 KSP Residual norm 1.199213228986e+02 > 352 KSP Residual norm 1.183644579434e+02 > 353 KSP Residual norm 1.234968225554e+02 > 354 KSP Residual norm 2.882557881065e-01 > 355 KSP Residual norm 2.170676916299e+02 > 356 KSP Residual norm 5.764266225925e+00 > 357 KSP Residual norm 1.701448294063e+04 > Linear solve did not converge due to DIVERGED_DTOL iterations 357 > > When iteration=357, the residual norm is 1.7e+4,it is less than dtol. > Is it right? > > Thanks. > > Jim > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20130108/52cc0135/attachment-0001.html>
