[MITgcm-support] optim_m1qn3 on ARCHER supercomputer

[GOLDBERG Daniel]

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<mailto: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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