[gmx-users] segmentation fault from power6 kernel

Fabio AFFINITO f.affinito at cineca.it
Thu Nov 3 20:41:03 CET 2011

Hi Mark,
today I tested the 4.5.5 version. It seems here there's not that problem. Anyway, I will take some days to make more tests. 

Thank you,


----- Messaggio originale -----
Da: "Mark Abraham" <Mark.Abraham at anu.edu.au>
A: "Discussion list for GROMACS users" <gmx-users at gromacs.org>
Inviato: Giovedì, 3 novembre 2011 14:40:39
Oggetto: Re: [gmx-users] segmentation fault from power6 kernel

On 3/11/2011 7:59 PM, Fabio Affinito wrote: 

Thank you, Mark. 
Using GMX_NOOPTIMIZEDKERNELS=1 everything runs fine on power6. 
I also tried to run on a linux cluster and it went ok. 

Sounds like a bug. Please file a report here http://redmine.gromacs.org including your observations and a .tpr that will reproduce them. 




The most likely issue is some normal "blowing up" scenario leading to a 
table-lookup-overrun segfault in the 3xx series kernels. I don't know 
why the usual error messages in such scenarios did not arise on this 
platform. Try setting the environment variable GMX_NOOPTIMIZEDKERNELS to 
1 to see if this is a power6-specific kernel issue. Try running the .tpr 
on another platform. 


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