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<body class='hmmessage'><div dir='ltr'>Hi, <div>I am observing some really really really weird SNES behavior in my SNESVI code called through Libmesh. This behaviour appeared after I changed some initial conditions and only happens in an optimized build. I am running this code on a Macbook pro running os x 10.8.. </div><div><br></div><div>When the debug code is run, the residuals computed for the initial conditions provided give norms which are of the expected magnitude.. so the SNES_Monitor output is, </div><div><div><br></div><div>solving the cahn hilliard time step</div><div> 0 SNES Function norm 8.223262421671e-01</div><div> 1 SNES Function norm 3.793806858333e-03</div><div>Nonlinear solve did not converge due to DIVERGED_MAX_IT iterations 1</div></div><div><br></div><div>The output from SNES_Monitor with the optimized code on the other hand is, </div><div><br></div><div><div>solving the cahn hilliard time step</div><div> 0 SNES Function norm 5.153882032022e+19</div><div> 1 SNES Function norm 1.446612980133e+19</div><div>Nonlinear solve did not converge due to DIVERGED_MAX_IT iterations 1</div></div><div><br></div><div><br></div><div>Absolutely nothing else has changed in the code except that one code is built with a debugging and one with an optimized version of the code. </div><div><br></div><div>Any ideas?</div><div>Subramanya</div> </div></body>
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