Hello,
I have a code using preconditioned (SSOR) CG that converges (in <500
iterations) in one system (32 bit, Ubuntu 9.10, gcc 4.4.1, no threading,
deal.II 6.2.1), but fails to converge (in 10,000 iterations) in another system
(4 bit, RedHat 4, gcc 4.4.2, no threading, deal.II 6.3.1). Has anyone run into
a similar problem or might otherwise know what the problem could be?
In a nutshell my code:
- is a derivation of the Step 8 tutorial for linear elastic analysis
- uses the cell user_index to point to a vector of scalars that weight each
cell stiffness matrix (I am doing topology optimization)
- uses the periodic-constraints.h module provided in a previous posting of this
list to impose periodic boundary conditions.
Thanks in advance for any help you could
provide!
-Julian
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