[CIG-MC] CIG-MC Digest, Vol 79, Issue 1

Sun Nov 24 13:24:08 PST 2013

Hi Magali,

These are all good points but I did want to correct the point that there 
are no known published work using coupled codes with CitcomS. We had 
three papers, a plume study and two subduction studies:

http://www.gps.caltech.edu/~gurnis/Papers/2006_Tan_etal_G3.pdf

http://www.gps.caltech.edu/~gurnis/Papers/2011_DiCaprio_etal_Lithosphere.pdf

http://www.gps.caltech.edu/~gurnis/Papers/2011_Matthews_etal_GondRes.pdf

We are currently not using the coupler in my group.

Mike

On 11/22/13 9:24 AM, Magali Billen wrote:
> Thorsten and Katie bring up good points. I am more concerned about 
> their being good cookbooks
> available, then about coupling codes.
>
> First, there are known issue with cookbooks (some only work  as shown 
> with older version of CitcomS),
> so this would be a good opportunity to update these. I 
> suggest soliciting very well documented contributions
> from members of this mailing list, which they use when starting their 
> students on problems.
>
> Second, I don't know of any published work using coupled codes (please 
> correct me if I'm wrong). While this was demonstrated to work for some 
> simple models and was a heroic effort for those who made it work, its 
> hard to get to work in practice for more complicated problems. For 
> example, if you have higher resolution for a CitcomS model embedded 
> inside a larger CitcomS models with lower resolution - any thermal 
> boundary layer ends up creating thermal instabilities at the sides of 
> the box due to the mismatch in the thickness). If someone is using the 
> coupler, then we need to keep this capability, but if after this much 
> time no one has used it, that is telling us something important.
>
> -Magali
>
>
> On Nov 21, 2013, at 9:15 PM, Catherine Cooper wrote:
>
>>
>> I am also concerned about this development.  The cookbooks provided 
>> with the manual will only work if the pyre version of CitcomS is 
>> installed.  Will there be new cookbooks developed?  Or will they too 
>> no longer be supported?  These are valuable learning tools for new 
>> users including graduate students.  It would be a shame if there were 
>> no longer educational examples for new users to safely learn on.
>>
>> Thanks,
>>
>> Katie
>>
>>
>> Catherine Cooper, Ph.D.
>> Assistant Professor in Geophysics
>> School of the Environment
>> Washington State University
>> (509)335-1501
>> cmcooper at wsu.edu <mailto:cmcooper at wsu.edu>
>>
>>
>> On Nov 21, 2013, at 9:03 PM, Thorsten Becker wrote:
>>
>>> Hi
>>>
>>> While I am not a python/pyre user, I wonder how this affects the 
>>> abilities to couple regional and global codes, for example? This is 
>>> another extension I am not using, but this always seemed very 
>>> helpful potentially? Wouldn't this be useful to maintain?
>>>
>>> When I compile CitcomS, I simply use the --nopyre option or whatever 
>>> it's called, and this seems to get rid off many of the issues 
>>> mentioned above?
>>>
>>>  I can see how this must have all been discussed but I am not aware 
>>> of the reasoning, sorry, so please excuse if these are naive questions.
>>>
>>> Thanks!
>>>
>>> Thorsten
>>>
>>>
>>>
>>> Thorsten W Becker - USC
>>>
>>>
>>> On Thu, Nov 21, 2013 at 12:00 PM, <cig-mc-request at geodynamics.org 
>>> <mailto:cig-mc-request at geodynamics.org>> wrote:
>>>
>>>     Send CIG-MC mailing list submissions to
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>>>
>>>     Today's Topics:
>>>
>>>        1. CitcomS Python Removal (Eric Heien)
>>>
>>>
>>>     ----------------------------------------------------------------------
>>>
>>>     Message: 1
>>>     Date: Thu, 21 Nov 2013 10:47:06 -0800
>>>     From: Eric Heien <emheien at ucdavis.edu <mailto:emheien at ucdavis.edu>>
>>>     To: CIG-MC at geodynamics.org <mailto:CIG-MC at geodynamics.org>
>>>     Subject: [CIG-MC] CitcomS Python Removal
>>>     Message-ID: <00B7E076-EC0E-4E5B-AA20-4DADB9498AFA at ucdavis.edu
>>>     <mailto:00B7E076-EC0E-4E5B-AA20-4DADB9498AFA at ucdavis.edu>>
>>>     Content-Type: text/plain; charset=windows-1252
>>>
>>>     Hello,
>>>
>>>     The CitcomS developers have recently decided to remove Python
>>>     and Pyre support from CitcomS.  There are several reasons for this:
>>>
>>>     - The Python interface in CitcomS is not compatible with Python
>>>     2.7 or above.  Python 2.7 was released in 2010, meaning most
>>>     systems set up in the last 3 years won?t support Python in CitcomS.
>>>     - The interface requires downloading extra packages - this
>>>     happens automatically but can cause compilation failure on some
>>>     platforms.
>>>     - The interface opaquely assigns some parameters with values not
>>>     controlled by the user.
>>>     - The Python interface adds a level of complexity making it
>>>     harder to debug the program and understand how data structures
>>>     are used/modified during a run.
>>>     - Many of the major CitcomS users do not use the Python interface.
>>>
>>>     We plan to remove this functionality from CitcomS and provide
>>>     tools to convert Python based input files to the normal input
>>>     file format.  Relevant logic that was in the Python framework
>>>     will be moved into the main CitcomS code.  This change will be
>>>     implemented over the coming year and incorporated into a future
>>>     CitcomS release.
>>>
>>>     If you have any concerns about this decision or would like to
>>>     weigh in, feel free to contact me or the cig-mc mailing list.
>>>
>>>     Thank you,
>>>
>>>     -Eric
>>>
>>>
>>>
>>>     ------------------------------
>>>
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>>>     End of CIG-MC Digest, Vol 79, Issue 1
>>>     *************************************
>>>
>>>
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