[petsc-users] Improve in speed/efficiency from partitioning in 1 direction to 3 directions

[TAY wee-beng]

On 4/9/2012 1:54 PM, Aron Ahmadia wrote:
> There are a lot of other factors at play here, including how much time
> you are spending working on the code, how far you're trying to scale
> the algorithm and how much communication dominates your problem for
> the architectures and algorithms you are using.  Unless you are trying
> to take this code to thousands of processors I probably wouldn't worry
> about it.
>
> A

Ok thanks for the suggestions Aron. I'll look at others parts for 
optimization.
>
> On Tue, Sep 4, 2012 at 11:17 AM, TAY wee-beng <zonexo at gmail.com> wrote:
>> On 4/9/2012 11:11 AM, Aron Ahmadia wrote:
>>> This doesn't strike me as a particularly large problem.  I'm not sure
>>> it's worth doing unless you are going to be looking at more unknowns
>>> in the future.
>>>
>>> A
>> Hi Aron,
>>
>> It will increase to 500x500x1200 or more. In that case, do you think it's
>> worth it?
>>
>> Thanks!
>>
>>> On Tue, Sep 4, 2012 at 10:08 AM, TAY wee-beng <zonexo at gmail.com> wrote:
>>>> Hi,
>>>>
>>>> My Fortran CFD code is currently partitioned in the z direction. Total
>>>> grid
>>>> size is around is 153x248x620. Hence depending on the no. of procs, the z
>>>> direction 620 is partitioned. The grid size changes but the ratio is
>>>> around
>>>> there.
>>>>
>>>> Parititoning in 3 directions was initially too complex for me. However,
>>>> it
>>>> seems to be much simplified with the use of DM. However, there's still a
>>>> lot
>>>> of work to be done to make it working.
>>>>
>>>> I'm wondering how much improvement in speed/efficiency will I get, if I
>>>> partition from 1 direction to 3 directions. Is it worth the effort?
>>>>
>>>> --
>>>> Yours sincerely,
>>>>
>>>> TAY wee-beng
>>>>