[MITgcm-support] optim_m1qn3 on ARCHER supercomputer

[Martin Losch]

Hi Dan,

I was wrong, the problem is already there after reading xx with  optim_readdata. It has got to do something with the header information where a lot of integer stuff is written.

I also noticed that the cray compiler complains about bi/bj being used/written before defined and some other old features in the code. Fixing that doesn’t change anything (although it needs to be fixed). More tomorrow.

Martin

> On 10. Apr 2019, at 18:02, Martin Losch <Martin.Losch at awi.de> wrote:
> 
> Hi Dan,
> 
> I don’t have access to ARCHER but I have a Cray CS400 with a somewhat disfunctional cray compiler. I followed the instructions in the README.md on https://github.com/mjlosch/optim_m1qn3 and I was able to run the tutorial_global_oce_optim for the zeroth iteration (so I can assume that in this case my compiler is not totally off), I could also compile and run optim.x with these flags:
> 
> 
> CPPFLAGS = -DREAL_BYTE=4		\
> 	-DMAX_INDEPEND=1000000		\
> 	-D_RL=‘real*8'	\
> 	-D_RS=‘real*4'	\
> 	-D_d='d'
> 
> #                -DMAX_INDEPEND=293570968        \
> # FORTRAN compiler and its flags copied from the opt file, or rather the Makefile of tutorial_global_oce_optim
> FC              = ftn
> FFLAGS     =  -h byteswapio -hnoomp -O0 -hfp0
> 
> Everything looks good until m1qn3_offline is called, unfortunately.
> I get many wrong numbers ( somthingE+/-317, and even NaN), but also useful numbers in xx after m1qn3_offline has been called. This looks like something more severe. I’ll look into that, but if you can get this far, that would be good.
> 
> Please use the github version.
> 
> Martin
> 
> 
> 
>> On 10. Apr 2019, at 16:30, GOLDBERG Daniel <Dan.Goldberg at ed.ac.uk> wrote:
>> 
>> Hello Martin (or anyone who has used optim_m1qn3 on ARCHER)
>> 
>> I have used optim_m1qn3 previously but not on the ARCHER UK supercomputer (a Cray architecture). The setup i am using (making use of STREAMICE/OpenAD/optim_m1qn3) has been working well on the MIT engaging cluster but am now trying to run on ARCHER. Following the recommendations of others I have built MITgcm using Cray compilers; and i modified mlosch/m1qn3_optim/Makefile, save to point to my build directory.
>> 
>> The first call to optim.x yields the error
>> 
>> ============================================================
>>  OPTIM_READDATA: opened file ecco_cost_MIT_CE_000.opt0000                                                                
>> At line 1295 of file optim_readdata.f (unit = 20, file = 'ecco_cost_MIT_CE_000.opt0000')
>> Fortran runtime error: End of file
>> ============================================================ 
>> 
>> which suggests the binary file is written in a format that optim_m1qn3 is not expecting? 
>> 
>> Other tests I did:
>> 
>> 1) Ran the same experiment (i.e. same code and input, but with gnu compilers) on the engaging cluster. Ran fine.
>> 2) Called optim.x (compiled on Archer) with the ecco_cost_MIT_CE_000.opt0000 produced on engaging. Ran fine.
>> 3) Called optim.x (compiled on engaging) with the ecco_cost_MIT_CE_000.opt0000 produced on ARCHER. 
>> 
>> Hence, either mitgcmuv_ad is writing a corrupted executable when built with a cray compiler, or the Makefile of m1qn3_optim should be modified to reflect that its input files are being produced by a cray-compiled executable -- but I do not know how to do this. I am attempting now to build and run MITgcm/OAD using iFort, but may run into trouble for different reasons.
>> 
>> Any guidance you could give on this topic would be much appreciated.
>> 
>> Best
>> Dan
>> 
>> -- 
>> 
>> Daniel Goldberg, PhD
>> Sr. Lecturer in Glaciology
>> School of Geosciences, University of Edinburgh
>> Geography Building, Drummond Street, Edinburgh EH8 9XP
>> 
>> 
>> em: dan.goldberg at ed.ac.uk
>> web: https://www.geos.ed.ac.uk/homes/dgoldber
>> The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.
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> 
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