[Difx-users] DiFX version for VGOS data correlation {External}

[Mike Titus]

Walter,

OK - thanks; will dig into both issues and prep examples.  I didn't 
write that note with intent of it being posted to the Difx-users email 
exploder.  Was hoping to look into it locally first.

Mike

On Fri, 11 Mar 2022, Walter Brisken wrote:

>
> Hi Mike (and others),
>
> Anyone having issues with the new vex2difx (with vex2 support), please 
> either use this list or send mail directly to me.  For any corrections 
> to be done I will need the full set of files needed to run vex2difx.
>
> Jan Wagner already identified one case where the vex2-enabled vex2difx 
> did not work for an EHT project.  The issue ended up being one where 
> the vex file was incomplete but the previous version of vex2difx 
> "filled in the blanks". We agreed that the correct course of action 
> for that particular case was bringing the vex file up to standards.
>
> I would encourage testing of trunk vex2difx (and reporting of issues) 
> sooner rather than later if possible.  There is still a low level of 
> activity on this.  After it dies down it will be harder to jump back 
> in for fixes!
>
> I have started gathering a set of vex2 files (and their vex1.5 
> counterparts) that can be used for comparisons.  I would appreciate 
> additional contributions (you can add them within the vex2testdata 
> subdirectory of trunk vex2difx.
>
> 	-Walter
>
> P.S. Mike: I think the python3 issue you are having must be related to 
> a broken installation of some software or a problem with the 
> environment of the user attempting to run the program.  This does not 
> sound like a DiFX-specific problem.
>
> -------------------------
> Walter Brisken
> NRAO
> Deputy Assistant Director for VLBA Development
> (505)-234-5912 (cell)
> (575)-835-7133 (office; not useful during COVID times)
>
> On Fri, 11 Mar 2022, Mike Titus via Difx-users wrote:
>
>> 
>> Just an FYI on something I discovered only a couple weeks ago because I 
>> have not tested the trunk in a long time.  The trunk currently refuses to 
>> parse VGOS vex/v2d setups I have used for years and work in all tagged 
>> versions (including your latest 2.7 build) i.e. right now it's entirely 
>> broken for VGOS.  Have not had time to pursue it yet. Probably coincident 
>> with the vex2 changes.
>> 
>> Also just because it's been so long, I tried to run my little heartbeat 
>> test schedule on the trunk (totally generic i.e. from the example on the 
>> DIFX site) and that won't run either, complaining about shared libraries:
>> 
>> python3: error while loading shared libraries: libssl.so.1.1: cannot open 
>> shared object file: No such file or directory
>> 
>> Note the same test works with 2.5.4 and 2.7 (tested at the same time). This 
>> is on po, BTW.
>> 
>> On Thu, 10 Mar 2022, Geoff Crew via Difx-users wrote:
>>
>>>  The issues have to do with the way complex spectra are processed and
>>>  handled in the backends and DiFX.  2.5.4 was created as a stable
>>>  processing release for VGOS until the resources were free to guarantee
>>>  operation in a "current" release.  And fixing this situation requires 
>>> some
>>>  coordination with the way backends are operated.  I'm not fluent in the
>>>  details.
>>>
>>>  A 2.7.1 release for the EHT processing of the 2021 campaign is likely to
>>>  occur in the next few months (as the media need to be recycled) and a
>>>  2.7-based release suitable for VGOS was one of the options discussed, but
>>>  I do not know the current plan for VGOS.
>>> 
>>>
>>>  On 3/10/22 15:07, Michael Dutka via Difx-users wrote:
>>>>  Hi Difx Users,
>>>>  Currently, as I understand things, it is advised that DiFX version
>>>>  2.5.4 should be used to correlate VGOS data.  I was wondering if
>>>>  anyone here had any documentation explaining why that's necessary and
>>>>  why we can not use the latest tagged release?  I was also wondering if
>>>>  anyone is working on making sure VGOS correlation will be able to be
>>>>  done with future versions of DiFX?
>>>>  Any help with this would be greatly appreciated!
>>>>  -Mike
>>>>
>>>  --
>>>  Geoff Crew
>>>  gbc at haystack.mit.edu
>>>
>>>  _______________________________________________
>>>  Difx-users mailing list
>>>  Difx-users at listmgr.nrao.edu
>>>  https://listmgr.nrao.edu/mailman/listinfo/difx-users
>>> 
>> 
>