[Users] Printing values when using MPI

[ian.hinder at aei.mpg.de]

> On 17 Jun 2018, at 10:52, Chris Stevens <c.stevens at ru.ac.za> wrote:
> 
> Hi everyone,
> 
> I am currently debugging some code and have been printing out (using either CCTK_INFO and/or printf) debugging information at particular grid points (LOCAL mode).
> 
> From what I can tell, Cactus only allows output from one process, say rank 0, to stop flooding of the output by printing everything once per process. However if I am wanting data from a particular grid point, and this grid point is not in the printing process, nothing will output.
> 
> I have been getting around this by turning off MPI (fine for one iteration or so) but now I am doing longer runs I need to be able to print out this information with MPI.
> 
> Thus my question:
> 
> How can you force Cactus to print out a statement from any process?
> 

Add -roe to the Cactus command line and you will get separate output and error files from each process.

-- 
Ian Hinder
https://ianhinder.net

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