<div dir="ltr">Compare to the initial residual. It should be obvious if you run with -ksp_monitor_true_residual</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jan 8, 2013 at 7:36 AM, w_ang_temp <span dir="ltr"><<a href="mailto:w_ang_temp@163.com" target="_blank">w_ang_temp@163.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="line-height:1.7;font-size:14px;font-family:arial"><p>Hello,</p>
<p> I use the default dtol(1.0E+5), in my view, only when residual norm is greater than</p>
<p>dtol, the DIVERGED_DTOL occurs(||rk||>dtol*||b||). But in my project, it is not. The information is:</p>
<p>349 KSP Residual norm 3.697892503779e-01 <br>350 KSP Residual norm 1.104685840662e+02 <br>351 KSP Residual norm 1.199213228986e+02 <br>352 KSP Residual norm 1.183644579434e+02 <br>353 KSP Residual norm 1.234968225554e+02 <br>
354 KSP Residual norm 2.882557881065e-01 <br>355 KSP Residual norm 2.170676916299e+02 <br>356 KSP Residual norm 5.764266225925e+00 <br>357 KSP Residual norm 1.701448294063e+04 <br>Linear solve did not converge due to DIVERGED_DTOL iterations 357</p>
<p> When iteration=357, the residual norm is 1.7e+4,it is less than dtol. Is it right?</p>
<p> Thanks.<br> <br> Jim</p>
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