[CIG-SHORT] Fixing the Coarse level….

[Matthew Knepley]

On Wed, Sep 5, 2012 at 8:17 PM, Romain Jolivet <rjolivet at caltech.edu> wrote:

> Hello,
>
> While running my code in parallel, on a 24 core machine (not a cluster),
> with more than 16 threads, I get the following messages in between each
> iteration of the Non linear solver.
>
>  -- Integrating residual term in operator.
>  >>
> /home/jolivetr/MYBIN/pylith/pylith-1.7.1-linux-x86_64/lib/python2.7/site-packages/pylith/problems/Implicit.py:215:step
>  -- implicit(info)
>  -- Solving equations.
>   0 SNES Function norm 1.784837919545e-03
> [II] fixing the coarse-level matrix dead dofs
>   1 SNES Function norm 1.239041380174e-04
> [II] fixing the coarse-level matrix dead dofs
>   2 SNES Function norm 1.763935552911e-05
> [II] fixing the coarse-level matrix dead dofs
>   3 SNES Function norm 2.599718269752e-06
> [II] fixing the coarse-level matrix dead dofs
>   4 SNES Function norm 1.164158628292e-05
> [II] fixing the coarse-level matrix dead dofs
>   5 SNES Function norm 2.377784148584e-08
> [II] fixing the coarse-level matrix dead dofs
>
> What does "fixing the coarse-level matrix dead dofs" means?
> It does not show up when I run this problem with less threads. Does it
> have to do something with splitting the problem over too much threads that
> my problem really needs?
>

This message comes from ML (it is quite rude of them to print to the
screen). I suspect that it concerns empty
partitions, which become more likely as you increase the number of
processors.

  Thanks,

     Matt


> Thanks,
> Romain
>
> Romain Jolivet
> Postdoctoral Scholar
> Geological and Planetary Sciences
> California Institute of Technology, Pasadena, CA
> rjolivet at caltech.edu
> +1 (626) 560 6356
>
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