[petsc-users] MatSetValues and values cache

[Alexander Grayver]

Hi,

In my program I assemble huge matrix (~500 millions of double complex 
nnz) and all MatSetValues calls are done before MatAssemblyBegin(A, 
MAT_FINAL_ASSEMBLY).
I'm wondering if it makes sense to use MatAssemblyBegin(A, 
MAT_FLUSH_ASSEMBLY) in between? In docs it is said:
 >> MatSetValues 
<http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatSetValues.html#MatSetValues>() 
generally caches the values.

How does the caching work actually? Is this additionally allocated 
memory (dynamic or not)?

Thanks.

-- 
Regards,
Alexander

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