[FLASH-USERS] Code crash when moving to an AMD based machine

[Reyes, Adam]

Hi Haakon,

Could you share a bit more context about what you’re observing, maybe the exact error from FLASH and the boundary conditions that you’re using? Are you using the same compiler between the two machines?
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Adam Reyes


Code Group Leader, Flash Center for Computational Science  
Research Scientist, Dept. of Physics and Astronomy
University of Rochester
River Campus: Bausch and Lomb Hall, 369  
500 Wilson Blvd. PO Box 270171, Rochester, NY 14627
Email adam.reyes at rochester.edu
Web https://flash.rochester.edu
 (he / him / his)


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> On Apr 29, 2024, at 4:02 PM, Haakon Andresen <haakon.andresen at astro.su.se> wrote:
> 
> Dear Flash users,
> 
> I am currently testing FLASH on a machine with AMD CPUs, specifically AMD EPYC 7763. Previously, I have only used the code on Intel based architecture. I have encountered a bug, which I believe is related to guard-cell fills, but I have not found the root cause yet. 
> 
> I am doing core-collapse simulations with paramesh, the code initializes and writes the first checkpoint file, but then crashes in hydro-solver. The crash occurs during a call to the subroutine that is responsible for filling guard cells. My debugging has lead me all the way into the paramesh routines. The error, guard cells being filled with bad values, happens at a refinement boundary. The test is done in 1D.
> 
> The puzzling part is that the code, with the exact same setup, runs just fine on a different machine (an intel machine). I am wondering if anyone have seen similar behavior in the past. I am not sure that the root cause is in paramesh, but if anyone have experience anything similar I would love to hear about it, maybe it will help me identify the issue. 
> 
> Best,
> Haakon Andresen
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