[petsc-users] conditioning of snes with dmcomposite & grid sequencing

[Gideon Simpson]

Following up on the previous thread, for my dm composite problem, I find that at the end of the first grid sequence,where it fails to converge, the distribution of the norms between the two pieces are:

 39 SNES Function norm 2.253098577796e+02 
 40 SNES Function norm 2.253098577331e+02 
 41 SNES Function norm 2.253098577228e+02 
 42 SNES Function norm 2.253098577212e+02 
 43 SNES Function norm 2.253098577174e+02 
 44 SNES Function norm 2.253098577166e+02 
 45 SNES Function norm 2.253098577158e+02 
 46 SNES Function norm 2.253098577157e+02 
 47 SNES Function norm 2.253098577156e+02 
 48 SNES Function norm 2.253098577156e+02 
Nonlinear solve did not converge due to DIVERGED_LINE_SEARCH iterations 48
 ||r|| = 225.31, 7999 entries
 ||rp|| = 140.021, 3 entries
 ||rQ|| = 176.518, 7996 entries

Since I think we were convinced that this was intrinsic to the problem, and not a function of the Jacobian function, I am using my Jacobian.

-gideon

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