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

[Barry Smith]

  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.

  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 <mailto:pierre at joliv.et>> wrote:
> 
> 
>> On 22 Apr 2021, at 5:33 PM, Jacob Faibussowitsch <jacob.fai at gmail.com <mailto: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 <mailto:mfadams at lbl.gov>> wrote:
>>> 
>>> Can I make -info only print from one process?
>>> Mark
>> 
> 

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