[MITgcm-support] MNC pickup

[Martin Losch]

If it works for you, that you can use it. As far as I remember the implementation is not foolproof: you get file for each MPI process, and you are not allowed to change your domain decomposition, ie. the number of MPI-processes between pickups (and I agree that’s not what one would do too often), further I have no idea how it works with OpenMP and multi-threading.

With the default mds-pickups and with useSingleCPUio=.TRUE., you get global pickup files that can be used with any domain decomposition. I does have the disadvantage of being difficult to read.

Martin

> On 12. Aug 2019, at 14:20, Safin, Artur <Artur.Safin at eawag.ch> wrote:
> 
> Dear MITgcm users,
> 
> I am testing whether I can use the mnc package to store the pickup files in netcdf format, and am getting the following warning message:
> 
> (PID.TID 0002.0001) ** WARNING ** MNC_READPARMS: incomplete MNC pickup files implementation
> (PID.TID 0002.0001) ** WARNING ** MNC_READPARMS: => pickup_write_mnc=T not recommanded
> (PID.TID 0002.0001) ** WARNING ** MNC_READPARMS: => pickup_read_mnc=T not working for some set-up
> 
> From what it seems, the message is triggered automatically anytime I set 'pickup_write_mnc = .TRUE.' . So far, the code seems to read the netcdf pickup files fine, but I am curious if anyone knows as to what might be missing or what issues I could potentially run into.
> 
> Best,
> Artur
> 
> 
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