[petsc-users] testing scalability for ksp/ex22.c (now ex45.c)

[Jed Brown]

On Fri, Feb 24, 2012 at 14:43, Francis Poulin <fpoulin at uwaterloo.ca> wrote:

> It seems to scale beautifully starting at 2 but there is a big drop from 1
> to 2.  I suspect there's a very good reason for this, I just don't know
> what.


Can you send the full output? The smoother is slightly different, so the
number of iterations could be different by 1 (for example). The
-log_summary part of the output will show us where the time is being spent,
so we'll be able to say what did not scale well between 1 and 2 procs.
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