Difference between revisions of "Advanced Use of the GCM"
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== Running in parallel == | == Running in parallel == | ||
| − | + | For large simulation (long run, high resolution etc...), the waiting time can becomes very long. | |
| + | To overcome this issue, the model can de run in parallel. | ||
| + | It first needs to be compiled in parallel mode and then be run with a specific command. | ||
| + | For all the details see the page [https://lmdz-forge.lmd.jussieu.fr/mediawiki/Planets/index.php/Parallelism#How_to_run_in_parallel Parallelism] | ||
== Distinctions beween ifort, mpi, etc. == | == Distinctions beween ifort, mpi, etc. == | ||
Revision as of 09:42, 11 May 2022
Contents
Running in parallel
For large simulation (long run, high resolution etc...), the waiting time can becomes very long. To overcome this issue, the model can de run in parallel. It first needs to be compiled in parallel mode and then be run with a specific command. For all the details see the page Parallelism
Distinctions beween ifort, mpi, etc.
TO BE COMPLETED BWAAAAA
Distinction between using IOIPSL or XIOS
TO BE COMPLETED
How to Change Vertical and Horizontal Resolutions
To run at a different grid resolution than available initial conditions files, one needs to use the tools newstart.e and start2archive.e
For example, to create initial states at grid resolution 32×24×25 from NetCDF files start and startfi at grid resolution 64×48×32 :
- Create file start_archive.nc with start2archive.e compiled at grid resolution 64×48×32 using old file z2sig.def used previously
- Create files restart.nc and restartfi.nc with newstart.e compiled at grid resolution 32×24×25, using a new file z2sig.def (more details below on the choice of the z2sig.def)
What you need to know about the z2sig.def file (change of vertical resolution only)
TO BE COMPLETED
How to Change the Topography (or remove it)
TO BE COMPLETED
How to Change the Opacity Tables
TO BE COMPLETED
How to Manage Tracers
The model can include different types of tracers:
- condensed species (e.g., CO2, H2O, dust)
- chemically active species
- radiatively active gases (e.g., water vapor)
In the code, all tracers are stored in one three-dimensional array q, the third index of which corresponds to each individual tracer.
In input and output files (“start.nc”, “startfi.nc”), tracers are stored separately using their individual names.
Loading specific tracers requires that the approriate tracer names are set in the traceur.def file, and specific computations for given tracers (e.g. computing the water or CO2 cycles) is controlled by setting the corresponding options in the callphys.def file.
TO BE COMPLETED
