[MITgcm-support] Open all input files in Read only mode

[Martin Losch]

Hi Siva,

recently (2022/04/27) a flag was added that opens input files readonly by default (https://github.com/MITgcm/MITgcm/pull/596). In the code (pkg/mdsio) you’ll find the _READONLY_ACTION macro, which defaults to “ ACTION=read,” defining EXCLUDE_OPEN_ACTION sets this flag to nothing and files are opened as readwrite.

Something similar happened to the namelist files (https://github.com/MITgcm/MITgcm/pull/621)

Martin

> On 25. Apr 2023, at 14:39, Siva Reddy Sanikommu <sivareddy.sanikommu at kaust.edu.sa> wrote:
> 
> Hi Team,
> I believe all the input files (external forcing, obcs, bathymetry and initial conditions) in MITgcm can be opened in "read only" mode. However, I notice that the files are opened in read-write mode on my machine (Shaheen that uses lustre parallel file system based on Cray) which makes the compute nodes unable to access these input files; compute nodes in my machine running on /scratch have read only permissions to /project. 
> 
> Can you help me figure out the relevant part of the code(s) where I can change to read these input files in "read only" mode?
> 
> -- 
> Dr. Siva Reddy Sanikommu
> Research Scientist
> Physical Sciences and Engineering (PSE) Division
> Room # 4402, Building #1
> King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
> Mobile: +966 549594174
> off: +966 12 8080669
> Alt.Email: sivamtech07 at gmail.com
> 
> 
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