Ocean Modeling Discussion

Dear community, I'd like to write out the walltime for the initialization phase and the time stepping phase separately, but I'm struggling, due to my lack of Fortran90 skills. Please help. What would the code snippets look like and where would you place them? I'm using MPI and PARALLEL_IO. All other ...

He all, I have a puzzle that I couldn't quite solve yet. We're restarting the a computationally expensive run every 5 days, but want to write out monthly averages (our 1 month = 365/12 days). Apparently when ROMS writes out averages after roughly 5 restarts it just considers timesteps from the ...

I'm working on a distributed memory cluster that offers nodes with either 16 processors (32 or 64gb memory available), or with 28 processors (128 or 256 gb memory available). I use the following software to compile and run roms: intel-fc/2018.1.163, netcdf/4.6.1p (p stands for parallel), openmpi/3.1 ...

ok, I think we are a step further here. I've managed to run PARALLEL_IO successfully with the most recent ROMS version and the UPWELLING and INLET_TEST test cases. It also works for my application, when I just write out 2D fields. However, when I start writing out 3D fields the run crashes with a ...

I get the same error with both, nc4 and nc7. Did it ever work for you Kate? If so, which versions of netcdf4, openmpi and hdf5 did you use?

Thanks

The bug with mpi_collect has been fixed in the latest version of ROMS. I've managed to compile updating nf_fread2d.f90. Now I get a different error during initialization: INITIAL: Configuring and initializing forward nonlinear model ... ******* NETCDF_OPEN - unable to open existing NetCDF file for ...

I've checked with the supercomputer support team and they are confident that we create the right environment for parallel IO to work. When I activate PARALLEL_IO and HDF5, I get the following error message: cd Build; /apps/openmpi/wrapper/fortran/mpif90 -c -heap-arrays -fp-model precise -ip -O3 nf ...

Hey Kate, thanks for your reply. I/O could explain my weird HPC errors maybe. I wasn't aware how ROMS manages IO and did not have any parallel options active. I tried activating PARALLEL_IO in combination with either HDF5 or PNETCDF flags. My activated makefile options are USE_MPI, USE_NETCDF4, USE ...

Dear experienced ocean modellers, When I up scale my application from 10 km to 2 km resolution, I have trouble getting the model running with a sensible tiling. Please see here a table with previous successful and failed runs and the heads of the error messages at the end of the post: Resolution (km ...

Thanks Kosa, ramping the tides seems just to delay the issue by a couple of timesteps. Anyway, we tried a test with flat bathymetry and it did not blow up. So I looked at the corner bathy in more detail and found this mountain ridges, which form a little triangle exact in the corner. modelbathy ...

Dear ROMS users, If I force my whole Antartic application with tidal surface elevation at the northern boundaries, I get this strange response in one of the corners (figure shows surface elevation anomaly): ssh_blowup.png The figure relates to the following simplified case: ​*Initialization with no s ...