[petsc-users] Can i use rank=0 to set matrix value, and solve with all the cpus.

[Dave May]

On 29 August 2016 at 13:19, 丁老师 <ztdepyahoo at 163.com> wrote:

> Dear friends:
>     I want to use the root node(MyRank=0) only to set the matrix values,
> while solve the Ax=b with all the CPU nodes.
>   will it work?
>

Yes it will "work", in the sense that the code will run.

Note however that this approach, whilst "working", is not the recommended
way to assemble a matrix as (i) it is sequential in nature and (ii) will
involve a lot of data movement across the network.

Thanks,
  Dave



>
> Regards
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