[petsc-users] MatPermute for MPIBAIJ matrix Error

[Rongliang Chen]

Hi Jed,

Many thanks for your suggestions. We are using a parallel SOR as the 
local solver and in the SOR, we want to ignore the nonzeros not on this 
thread, but we hope to keep the nonzeros as much as possible, so reduce 
the bandwidth is a possible way to keep the nonzeros.

Best regards,
Rongliang



On 06/18/2016 12:01 PM, Jed Brown wrote:
> Rongliang Chen <rl.chen at siat.ac.cn> writes:
>
>> Dear Barry,
>>
>> Many thanks for your reply.
>>
>> In fact, we want to permute a sequential matrix which is a BAIJ matrix
>> (the sub matrix of the ASM)
> BJACOBI supports multiprocess subdomains.  GASM is supposed to support
> multiprocess subdomains, though it's not very well tested.
>
>> to reduce the bandwidth of the sub-matrix
> Why do you want to reduce the bandwidth?  What kind of solver are you using?