[Difx-users] root_id problem with Difx2mark4

[Geoff Crew]

The problem is fixed on DiFX trunk (with root codes that won't
expire for a very long time).  A patch for DiFX 2.5 is in the
works and will be available later this week.

-- 

		Geoff (gbc at haystack.mit.edu)

On Tue, Feb 27, 2018 at 01:09:39PM +1100, Jamie McCallum wrote:
> Hello everyone,	
> 	When converting a recently correlated experiment into mark4 output, 
> Jakob Gruber and I encountered a problem with the the root ID assigned 
> to the files. This was given as "{abdgh", after finally running out of 
> alphabetical characters. Unfortunately, the bracket character causes 
> problems for the file system and fourfit can't handle these files.
> 	Renaming the files by substituting "a" for "{" did not resolve the 
> issue, as the root ID is cross-referenced within the data structure.
> 	To work around the issue, we've recompiled difx2mark4 after editing 
> 	the root_id.c program to use 1999 as the reference epoch, rather than 1979. 
> This has reset the root_id codes to ~mmaaaa and will buy us ~18 years 
> before we run into the same problem again. The output data can be parsed 
> by fourfit without any apparent issues.
> 	Does anybody know if this offset root_id code will cause problems 
> 	down the line, or of any better solution to the issue?
> Best regards,
> Jamie McCallum and Jakob Gruber
> 
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