[petsc-dev] VecAXPY() in loops in TS

[Jed Brown]

On Sat, Feb 19, 2011 at 00:24, Barry Smith <bsmith at mcs.anl.gov> wrote:

>  Even adjusting the array passed in will be worth it.
>

Yes, the work to futz around with the small array is tiny compared to the
cost of streaming the vector through extra times.


>
>  Should MAXPY have an optional constant scale factor, does it come up
> enough?
>

It looks like about half of the uses in PETSc are preceded by a loop to
apply some constant factor, so I think such a parameter would be worthwhile.
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