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 <[email protected]> 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 <[email protected] <mailto:[email protected]>> wrote:

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On 22 Apr 2021, at 5:33 PM, Jacob Faibussowitsch <[email protected] <mailto:[email protected]>> 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

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Best regards,

Jacob Faibussowitsch (Jacob Fai - booss - oh - vitch)

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On Apr 22, 2021, at 10:16, Mark Adams <[email protected] <mailto:[email protected]>> wrote:

Can I make -info only print from one process? Mark