[gmx-users] cannot determine precision of trn file

Mark Abraham Mark.Abraham at anu.edu.au
Mon Mar 5 11:32:25 CET 2012

On 5/03/2012 8:48 PM, Nidhi Katyal wrote:
> Dear All,
> I was running my simulation for 30ns but at the last step i got 
> following error: "Cannot close energy file;it might be corrupt,  or 
> maybe you are out of quota."
> It was found that there was some disk space problem but when the issue 
> was resolved i restarted my run from the last step using append option 
> in mdrun.
> When finally the *.trr was created i used gmxcheck -f *.trr. But then 
> i got error saying that "Cannot determine precision of trn file".I 
> have checked my state.cpt
> and *.log file, they have correct number of frames.But then why *.trr 
> is giving this error.

IIRC there's some magic numbers that get written to the start of each 
frame that allow the reading software to determine the precision on the 
fly. It seems your .trr file lacks these. Maybe your file system and/or 
attempts at re-starts have not dealt well with the lack of available 
disk space. If you were able to restart, then the .trr was fine up to 
the restart point, but it is not clear from the above whether you did 
achieve a restart...


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