[Developers] PUGH: Checking whether there are enough ghost zones

[Erik Schnetter]

Dylan,

your yesterday change to PUGH removes a test whether there are enough 
ghost zones for inter-processor communication.  The test in SetupPGV.c 
(about line 1047) used to be run for all boundaries, and is now run 
only when there are periodic boundaries.  I believe that this is 
incorrect, because this test is still necessary for all boundaries.  
PUGH's current communication mechanism requires for n ghost zones at 
least n interior grid points.  Grids that are too small are not handled 
correctly by PUGH.

I have a pending patch that improves PUGH in the single processor case, 
i.e., for periodic boundaries that live on the same processor.  But as 
far as I know, there is no planned improvement for the multi-processor 
case.

-erik

-- 
Erik Schnetter <schnetter at aei.mpg.de>   http://www.aei.mpg.de/~eschnett/

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