On 17 Jun 2018, at 10:52, Chris Stevens <c.stevens@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.