[Ncep.list.fv3-announce] Theia upgrade impact on ESMF

[Jun Wang - NOAA Affiliate]

Correction: the git command to merge with the latest master is:

git pull origin master

Thanks.

Jun

On Wed, Nov 8, 2017 at 2:55 PM, Jun Wang - NOAA Affiliate <jun.wang at noaa.gov
> wrote:

> Dear all,
>
> I would like to clarify the status of NEMSfv3gfs. NEMSfv3gfs git master
> branch was updated to the modified EMSF lib on theia this morning. So
>
> 1) if you clone the NEMSfv3gfs repo, or if you check out the latest
> master, the code is working on theia.
>
> 2) If you are working on your own NEMSfv3gfs branch, we suggest you merge
> with the latest master branch by doing ( %git pull origin/master) . If at
> this moment, you are not able to merge to the master branch, you can use a
> temporary solution by change the ESMF lib in the NEMSfv3gfs module file
> NEMSfv3gfs/modulefiles/theia/fv3:
>
> esmf/7.0.0 should be replaced by
> * esmf/7.0.2*
> esmf/7.1.0bs34 should be replaced by esmf/7.1.0bs34.1
>
> If you are using esmf/7.1.0bs31, I would suggest you moved to  esmf/7.1.0bs34.1.
> Thanks!
>
>
> Jun
>
>
>
> On Wed, Nov 8, 2017 at 2:10 PM, Samuel Trahan - NOAA Affiliate <
> samuel.trahan at noaa.gov> wrote:
>
>> FV3 developers,
>>
>> See the announcement below about an issue with ESMF on Theia, and the
>> fix.  The email says "NEMS" but it actually impacts all applications that
>> use ESMF.
>>
>> Sincerely,
>> Sam Trahan
>>
>> ---------- Forwarded message ----------
>> From: Gerhard Theurich <theurich at sourcespring.net>
>> Date: Wed, Nov 8, 2017 at 1:23 PM
>> Subject: [Ncep.list.nems.announce] Theia upgrade impact on NEMS
>> To: NEMS developers <ncep.list.nems.announce at lstsrv.ncep.noaa.gov>
>> Cc: Cecelia DeLuca - NOAA Affiliate <Cecelia.Deluca at noaa.gov>
>>
>>
>> Dear NEMS developers,
>>
>> The Theia upgrade of 11/07/17 comes with an impact on NEMS applications.
>> You must very likely change which ESMF module your NEMS application is
>> pointing to, and rebuild your NEMS application.
>>
>> The impact on NEMS comes through the ESMF module that is loaded by the
>> NEMS application. Until recently, ESMF instructed the NEMS application
>> to explicitly link against Intel's Small Vector Math Library SVML (via
>> -lsvml). However, our current understanding is that there is an
>> incompatibility of Intel's SVML and the upgraded system libraries, that
>> will lead to strange numerical issues when working in optimization mode
>> -O2 or above.
>>
>> In order to mitigate the issue, all current ESMF installations do NOT
>> instruct the application to explicitly link against SVML. We have also
>> patched previous ESMF version and made them available on Theia. Old ESMF
>> installations on Theia have been disabled in order to prevent
>> hard-to-debug situations for when -lsvml is specified.
>>
>> The consequence for NEMS applications is that you must change the ESMF
>> module your application uses if currently it accesses an ESMF module
>> from under (they have ALL been disabled)
>>
>> /scratch4/NCEPDEV/nems/save/Gerhard.Theurich/Modulefiles/esmf/
>>
>> or any of the following ESMF modules from under
>>
>> /home/emc.nemspara/SOFT/modulefiles:
>>    esmf/7.1.0bs30
>>    esmf/7.1.0bs31
>>    esmf/7.1.0bs33
>>    esmf/7.1.0bs34
>>
>> The currently available replacement ESMF modules are:
>>
>>    esmf/7.0.2
>>    esmf/7.1.0bs05.1
>>    esmf/7.1.0bs24.1
>>    esmf/7.1.0bs34.1
>>
>> Also, any ESMF modules starting with esmf/7.1.0bs35 will work on the
>> upgraded Theia system.
>>
>> Please let me know if you have questions or specific problems getting an
>> application working on Theia since the upgrade. Thank you!
>>
>> Best,
>> -Gerhard
>> _______________________________________________
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>> Ncep.list.nems.announce at lstsrv.ncep.noaa.gov
>> https://www.lstsrv.ncep.noaa.gov/mailman/listinfo/ncep.list.nems.announce
>>
>>
>>
>>
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>>
>>
>
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