[FLASH-USERS] 4000+ cpus on Franklin

[James Guillochon]

Hi all,

I'm trying to restart a FLASH simulation on Franklin. If I run on 2000  
cpus, the job runs fine, however if I try to push the code to 4000  
cpus, I get the following error:

abort_message [flash_convert_cc_hook] Trying to convert non-zero mass- 
specific variable to per-volume form, but dens is zero!

I've been guessing that it has something to do with memory allocation,  
so I've tried reducing MAXBLOCKS substantially (but still above the  
maximum number of blocks on a given processor), but this doesn't solve  
the problem. I've also played a bit with the MPICH parameters, but  
they also seem to have limited effect. Anyone have an idea of what I  
can try to do to solve this problem?

Thanks!

-- 
James Guillochon
Department of Astronomy & Astrophysics
University of California, Santa Cruz
jfg at ucolick.org

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