[petsc-dev] MatSetValues with v=0

[Jed Brown]

Eric Chamberland <Eric.Chamberland at giref.ulaval.ca> writes:
> I have a new question now : what would be the fastest way to do the 
> first assembly: with INSERT_VALUES or ADD_VALUES?  Right now we are 
> doing ADD_VALUES but I imagine it have to hold all the "0" which will be 
> "added" later... maybe "INSERT_VALUES" will forget about overlapping 
> values??...  

It makes no difference.

> Anyway, the code I am rewriting now will hold all the non-zeros for
> each "block" of similar lines... so I don't have overlapping
> values... in sequential... but in parallel I think I will have
> some... Anyway, any pros/cons between INSERT_VALUES or ADD_VALUES for
> this first assembly?

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