[petsc-dev] examples/benchmarks for weak and strong scaling exercise

[Jed Brown]

Chris Kees <cekees at gmail.com> writes:

> Thanks a lot. I did a little example with the Bratu problem and posted it here:
>
> https://proteus.usace.army.mil/home/pub/17/
>
> I used boomeramg instead of geometric multigrid because I was getting
> an error with the options above:
>
> %mpiexec -np 4 ./ex5 -mx 129 -my 129 -Nx 2 -Ny 2 -pc_type mg -pc_mg_levels 2
> [0]PETSC ERROR: --------------------- Error Message
> ------------------------------------
> [0]PETSC ERROR: Argument out of range!
> [0]PETSC ERROR: New nonzero at (66,1) caused a malloc!
> [0]PETSC ERROR:
> ------------------------------------------------------------------------

That test hard-codes evil things (presumably for testing purposes,
though maybe the functionality has been subsumed).  Please use
src/snes/examples/tutorials/ex5.c instead.

 mpiexec -n 4 ./ex5 -da_grid_x 65 -da_grid_y 65 -pc_type mg -log_summary -da_refine 1

Increase '-da_refine 1' to get higher resolution.  (This will increase
the number of MG levels used by PCMG.)

Switch '-da_refine 1' to '-snes_grid_sequence 1' if you want FMG, but
note that it's trickier to profile because proportionately more time is
spent in coarse levels (although the total solve time is lower).

>
> I like the ice paper and will try to get the contractor started on
> reproducing those results.
>
> -Chris
>
> On Wed, Apr 10, 2013 at 1:13 PM, Nystrom, William D <wdn at lanl.gov> wrote:
>> Sorry.  I overlooked that the URL was using git protocol.  My bad.
>>
>> Dave
>>
>> ________________________________________
>> From: Jed Brown [five9a2 at gmail.com] on behalf of Jed Brown [jedbrown at mcs.anl.gov]
>> Sent: Wednesday, April 10, 2013 12:10 PM
>> To: Nystrom, William D; For users of the development version of PETSc; Chris Kees
>> Subject: Re: [petsc-dev] examples/benchmarks for weak and strong scaling exercise
>>
>> "Nystrom, William D" <wdn at lanl.gov> writes:
>>
>>> Jed,
>>>
>>> I tried cloning your tme-ice git repo as follows and it failed:
>>>
>>> % git clone --recursive git://github.com/jedbrown/tme-ice.git tme_ice
>>> Cloning into 'tme_ice'...
>>> fatal: unable to connect to github.com:
>>> github.com[0: 204.232.175.90]: errno=Connection timed out
>>>
>>> I'm doing this from an xterm that allows me to clone petsc just fine.
>>
>> You're using https or ssh to clone PETSc, but the git:// to clone
>> tme-ice.  The LANL network is blocking that port, so just use the https
>> or ssh protocol.