On Friday, 7 October 2016, frank wrote:
> Dear all,
>
> Thank you so much for the advice.
>
> All setup is done in the first solve.
>
>
>> ** The time for 1st solve does not scale.
>> In practice, I am solving a variable coefficient Poisson equation. I
>> need to build the
> On Oct 7, 2016, at 4:49 PM, frank wrote:
>
> Dear all,
>
> Thank you so much for the advice.
>> All setup is done in the first solve.
>>
>> ** The time for 1st solve does not scale.
>> In practice, I am solving a variable coefficient Poisson equation. I
>> need to
On 7 October 2016 at 02:05, Matthew Knepley wrote:
> On Thu, Oct 6, 2016 at 7:33 PM, frank wrote:
>
>> Dear Dave,
>> Follow your advice, I solve the identical equation twice and time two
>> steps separately. The result is below:
>>
>> Test: 1024^3 grid
On Thu, Oct 6, 2016 at 7:33 PM, frank wrote:
> Dear Dave,
> Follow your advice, I solve the identical equation twice and time two
> steps separately. The result is below:
>
> Test: 1024^3 grid points
> Cores#reduction factorMG levels#time of 1st solve2nd time
>
On Tue, Oct 4, 2016 at 3:26 PM, frank wrote:
>
> On 10/04/2016 01:20 PM, Matthew Knepley wrote:
>
> On Tue, Oct 4, 2016 at 3:09 PM, frank wrote:
>
>> Hi Dave,
>>
>> Thank you for the reply.
>> What do you mean by the "nested calls to KSPSolve"?
>>
>
>
On Tue, Oct 4, 2016 at 3:09 PM, frank wrote:
> Hi Dave,
>
> Thank you for the reply.
> What do you mean by the "nested calls to KSPSolve"?
>
KSPSolve is called again after redistributing the computation.
> I tried to call KSPSolve twice, but the the second solve converged in
Hi Dave,
Thank you for the reply.
What do you mean by the "nested calls to KSPSolve"?
I tried to call KSPSolve twice, but the the second solve converged in 0
iteration. KSPSolve seems to remember the solution. How can I force both
solves start from the same initial guess?
Thank you.
Frank
On Tuesday, 4 October 2016, frank wrote:
> Hi,
> This question is follow-up of the thread "Question about memory usage in
> Multigrid preconditioner".
> I used to have the "Out of Memory(OOM)" problem when using the
> CG+Telescope MG solver with 32768 cores. Adding the "-matrap
-ksp_view in both cases?
> On Oct 4, 2016, at 1:13 PM, frank wrote:
>
> Hi,
>
> This question is follow-up of the thread "Question about memory usage in
> Multigrid preconditioner".
> I used to have the "Out of Memory(OOM)" problem when using the CG+Telescope
> MG
On Tue, Oct 4, 2016 at 1:13 PM, frank wrote:
> Hi,
> This question is follow-up of the thread "Question about memory usage in
> Multigrid preconditioner".
> I used to have the "Out of Memory(OOM)" problem when using the
> CG+Telescope MG solver with 32768 cores. Adding the
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