The makelmdz fcm GCM Compilation Script

Overview

The makelmdz_fcm script is the (bash) script (located in LMDZ.COMMON directory) to use to compile the GCM. It is based on FCM and should be run, with various options (e.g which physics package to compile the model with, what grid resolution to use, etc.) to generate the sought executable.

makelmdz_fcm options

To list available options, run "makelmdz_fcm -h", which should return something like:

Usage :
makelmdz_fcm [options] -arch arch_name exec
[-h]                       : brief help
[-d [[IMx]JMx]LM]          : IM, JM, LM are the dimensions in x, y, z (default: 96x72x19)
[-s nscat]                 : (Generic) Number of radiatively active scatterers
[-b IRxVIS]                : (Generic) Number of infrared (IR) and visible (VIS) bands for radiative transfer
[-p PHYS]                  : set of physical parametrizations (in libf/phyPHYS), (default: lmd)
[-prod / -dev / -debug]    : compilation mode production (default) / developement / debug .
[-c false/MPI1/OMCT]       : (Earth) coupling with ocean model : MPI1/OMCT/false (default: false)
[-v false/orchidee2.0/orchidee1.9/true] : (Earth) version of the vegetation model to include (default: false)
          false       : no vegetation model
          orchidee2.0 : compile using ORCHIDEE 2.0 (or more recent version)
          orchidee1.9 : compile using ORCHIDEE up to the version including OpenMP in ORCHIDEE : tag 1.9-1.9.5(version AR5)-1.9.6
          true        : (obsolete; for backward compatibility) use ORCHIDEE tag 1.9-1.9.6
[-chimie INCA/false]       : (Earth) with INCA chemistry model or without (default: false)
[-cosp true/false]         : (Earth) add the cosp model (default: false)
[-sisvat true/false]  : (Earth) compile with/without sisvat package (default: false)
[-rrtm true/false]    : (Earth) compile with/without rrtm package (default: false)
[-dust true/false]    : (Earth) compile with/without the dust package by Boucher and co (default: false)
[-strataer true/false]    : (Earth) compile with/without the strat aer package by Boucher and co (default: false)
[-parallel none/mpi/omp/mpi_omp] : parallelism (default: none) : mpi, openmp or mixted mpi_openmp
[-g GRI]                   : grid configuration in dyn3d/GRI_xy.h  (default: reg, inclues a zoom)
[-io ioipsl/mix/xios]                   : Input/Output library (default: ioipsl)
[-include INCLUDES]        : extra include path to add
[-cpp CPP_KEY]             : additional preprocessing definitions
[-adjnt]                   : adjoint model, not operational ...
[-mem]                     : reduced memory dynamics (if in parallel mode)
[-filtre NOMFILTRE]        : use filtre from libf/NOMFILTRE (default: filtrez)
[-link LINKS]              : additional links with other libraries
[-j n]                     : active parallel compiling on ntask
[-full]                    : full (re-)compilation (from scratch)
[-libphy]                  : only compile physics package (no dynamics or main program)
[-fcm_path path]           : path to the fcm tool (default: tools/fcm/bin)
[-ext_src path]            : path to an additional set of routines to compile with the model
[-arch_path path]          : path to architecture files (default: arch)
 -arch arch                : target architecture 
 exec                      : executable to build

Note that some options are meaningless for the Generic GCM. This is due to the fact that we try to coordinates tools like makelmdz_fcm between different physics packages. In what follows, we only discuss those relevant for the Generic physics.

The only mandatory argument are -arch and exec, but in practice you'll need to specify many more (as defaults rarely suit all needs)

Details of main makelmdz_fcm options

-d IMxJMxLM

As the default is to run on a fixed longitude-latitude grid (set when compiling), option "-d" is necessary to specify the number of grid points iimxjjmxlllm (actually iim is the number of intervals along longitude, jjm is the number of intervals along latitude and llm the number of atmospheric layers).

If compiling one of the 1D models, then only the number of layers (llm) needs be specified, e.g. -d 78.

-p std

The -p option enables picking which physics package to compile with. The adequate argument for the Generic model is std, i.e. corresponding code will be found in LMDZ.COMMON/libf/phystd

-b IRxVIS

Number of bands in the InfraRed and Visible for the radiative transfer. Note that this requires that the corresponding appropriate input files are available (at run time).

-s nscat

Number of radiatively active scatterers

-prod / -dev / -debug

Compilation mode. Default is -prod, i.e. "production" mode, where compiler optimization are on (as defined in the arch files; see The_Target_Architecture_("arch")_Files for details). When checking/debugging you definitely want to set -debug

-j n

With this option one can speed up compilation by letting make compile simultaneously (and if possible) up to n routines in parallel (note that this "parallel compilation" has nothing to do with the code being compiled for serial or parallel use as specified via option -parallel ...). In practice using -j 8 or -j 4 works well.

-parallel none/mpi/omp/mpi_omp

This option is to specify whether the model should be compiled in serial mode (default) or in parallel using MPI (mpi) only, or using OpenMP (omp) only, or both MPI and OpenMP (mpi_omp).

In practice, one most often needs to run in parallel and using both MPI and OpenMP, so -parallel mpi_omp is advised.

-io ioipsl/mix/xios

This option specifies which IO (Input/Output) library is going to be used by the model. Default is -io ioipsl, which is becoming depreciated for the GCM but mandatory for the 1D model. Note that when compiling with XIOS: -io xios on still needs to also use the IOIPSL library (which handles the reading of the run.def and companion files).

-full

Impose a full cleanup (i.e. removing past object and library files) to ensure recompiling the model from scratch.