[petsc-dev] -info from just one process?

[Mark Adams]

On Fri, Apr 23, 2021 at 2:57 AM Pierre Jolivet <pierre at joliv.et> wrote:

>
>
> On 22 Apr 2021, at 7:45 PM, Barry Smith <bsmith at petsc.dev> wrote:
>
>
>   It would be straightforward to add an option to -info to output only
> from a particular MPI_COMM_WORLD global rank.
>
>   Maybe an extra :rank at the end of the info options?
>
>   Open 128k files is nuts.
>
>
> It is what it is, I’ve made peace with the fact that I can’t expect any
> meaningful timings for large runs when this option is on.
>

I'm not talking about timings, I am talking about seeing where a code dies.


> As a side note, one would expect that this kind of behavior is consistent
> across the library.
> But in fact, it isn’t. If you do something like -sub_ksp_view_pmat file
> with, for example, DD preconditioners, you end up with a single file with
> all local matrices scrambled in.
> It would be nice to have the same logic, i.e., file.%p, and be able to
> filter ranks that actually print to file like you suggest.
> These kind of options are less critical than -info so I can just insert
> them in the option database after initialization, if rank == view_this_rank
> PetscOptionsInsertString(), but doing that using command line arguments
> would be easier and more elegant, IMO.
>
> Thanks,
> Pierre
>
>   Barry
>
> On Apr 22, 2021, at 11:14 AM, Mark Adams <mfadams at lbl.gov> wrote:
>
> OK, so -info out.%p would do what I asked. Alas, what I really need it to
> reduce the output with 128K processes.
> Thanks,
>
> On Thu, Apr 22, 2021 at 11:54 AM Pierre Jolivet <pierre at joliv.et> wrote:
>
>>
>>
>> On 22 Apr 2021, at 5:33 PM, Jacob Faibussowitsch <jacob.fai at gmail.com>
>> wrote:
>>
>> Not out of the box no. There is -info ::self which makes info only print
>> from calls made on PETSC_COMM_SELF, but I don’t think that’s what you want.
>> Best advice would be to print to a file and grep the file for any lines
>> starting with the rank number you want.
>>
>>
>> There is no need for grep, IMHO, just do -info file and then open file.%p
>>
>> Thanks,
>> Pierre
>>
>> Best regards,
>>
>> Jacob Faibussowitsch
>> (Jacob Fai - booss - oh - vitch)
>>
>> On Apr 22, 2021, at 10:16, Mark Adams <mfadams at lbl.gov> wrote:
>>
>> Can I make -info only print from one process?
>> Mark
>>
>>
>>
>>
>
>
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