[petsc-users] DIVERGED_DTOL

[w_ang_temp]

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/20130108/6d9a7137/attachment.html>