Nonzeros of SBAIJ

[Hong Zhang]

>> 
> Dear all
>
> I allocated the memory exactly with symbolic computation, and tried 
> preallocation on AIJ and SBAIJ, it works well for AIJ, no additional 
> allocaiton is needed in assembly... then I did it on SBAIJ ( nonzeros of 
> upper triangular part + 1), the performance is much worse , it seems that 
> memory allocation was still needed... does anyone have such problem before?

May I have the segment of your code that implements the memory allocation?
I'll test it and see what is the problem.

BTW, you may send this type of request to petsc-maint at mcs.anl.gov
instead of petsc-users.

Hong

>
> Thank you
> Best regards
> Zhifeng Sheng
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