Fazlul Huq writes:
> Thanks.
>
> I have tried with large problem also (10^7 X 10^7). Even then I got
> cholesky faster than multigrid.
> But, the problem is 1D. May be that's the reason.
Exactly. Cholesky is O(n) with a very small constant in 1D, O(n^{3/2})
in 2D, and O(n^2) in 3D.
Fazlul Huq via petsc-users writes:
> Hello PETSc Developers,
>
> I am trying to solve a poisson equation using "-pc_type cholesky" and
> "-pc_type hypre -pc_hypre_type boomeramg" and I got that cholesky
> decomposition method takes
> less time then multigrid method.
> Is this expected?
For smal
> On Dec 3, 2018, at 1:57 PM, Sajid Ali
> wrote:
>
> Apologies for the error on my part.
>
> Does the vector binary format also work the same way : VEC_FILE_CLASSID (32
> bit int), num_elements (32 bit int) , value of the elements in double
> (num_elements*64 bit double) ?
Yes.
>
On Mon, Dec 3, 2018 at 3:40 PM Danyang Su wrote:
>
> On 2018-12-03 12:03 p.m., Matthew Knepley wrote:
>
> On Mon, Dec 3, 2018 at 2:27 PM Danyang Su wrote:
>
>> Hi Matt,
>>
>> Thanks.
>>
>> BTW: DmPlexGetVertexNumbering now can work using the latest develop
>> version. But the index is not in nat
Apologies for the error on my part.
Does the vector binary format also work the same way : VEC_FILE_CLASSID
(32 bit int), num_elements (32 bit int) , value of the elements in double
(num_elements*64 bit double) ?
Are the doubles stored in IEEE_754 format ?
On Mon, Dec 3, 2018 at 1:43 PM Smith,
You saved a Vec to the file, not a Mat.
> On Dec 3, 2018, at 1:38 PM, Sajid Ali via petsc-users
> wrote:
>
> Hi,
>
> I ran ex10 from /vec/examples/tutorials and saved the matrix in binary format.
>
> Looking at the matrix in binary using xxd, I see
>
> [sajid@xrm temp]$ xxd -b vector.
Hi,
I ran ex10 from /vec/examples/tutorials and saved the matrix in binary
format.
Looking at the matrix in binary using xxd, I see
[sajid@xrm temp]$ xxd -b vector.dat
000: 00010010 0011 01001110 ..{N..
006: 00010100 000
Thank you very much both Hong and Matt for your answers!
I have looked at the examples and I am still in the middle of figuring out how
the concept of network in my application differs from the concept in the
examples.
It is sure that this will take me a while, especially since I am a beginner.
Hello,
I want to solve a cfd case, after decomposition, I get a sub matrix allocated
to each process. The example below shows how the data is allocated to the
processes (the sample data includes only the lower parts of the matrices). Row
and column addresses are local.
What petsc program setup
Thank you so much Matt and Dave,
we will test soon. I think they are what we were searching
for.
Alice
On Fri, 30 Nov 2018 19:40:34 +
Dave May wrote:
On Fri, 30 Nov 2018 at 14:50, RAELI ALICE via
petsc-users <
petsc-users@mcs.anl.gov> wrote:
Hi All,
My team is working on a PETSC vers
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