Difference between revisions of "FLEXPART Model/FLEXPARTCompilerSettings"
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| − | + | FLEXPART has been compiled on UIO servers so if you do not need to modify the source code, we suggest you use the pre-compiled version. If you have never used FLEXPART, the pre-compiled version is also helpful to become familiar with this new package. Some tutorials/examples are available on UIO servers. | |
| − | ==Compiling FLEXPART | + | == Compiling FLEXPART in a 64-bit environment == |
| + | This file describes the required compiler flags for compiling FLEXPART in a 64-bit computing environment for the gfortran compiler (version 4.2 and onward) and absoft compiler (version 10.1). | ||
| − | + | Using 64-bit environment brings the advantage of using >2GB main memory for FLEXPART data arrays. However, this requires certain adjustments to the compilation settings of FLEXPART and the external libraries GRIB_API and JASPER (the latter as required by GRIB_API). | |
| − | 64-bit | ||
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| − | + | The main point to be considered for running FLEXPART in a 64-bit environment is the possiblity to allocate data arrays >2GB. This requires to use the compiler flag '''-mcmodel=medium'''. Note that this memory model slows down calculations, if data arrays of less than 2GB are allocated, the use of -mcmodel=small is said to provide slightly better performance. | |
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| − | The main point to be considered for running FLEXPART in a 64-bit environment is the possiblity to allocate data arrays >2GB. This requires to use the compiler flag -mcmodel=medium. Note that this memory model slows down calculations, if data arrays of less than 2GB are allocated, the use of -mcmodel=small is said to provide slightly better performance. | ||
An additional requirement is that the external libraries must be compiled with the flag -fPIC to allow for the libraries to be located at any position in the computer's main memory. Without this flag, a 'relocation truncated to fit' error will result when linking FLEXPART. | An additional requirement is that the external libraries must be compiled with the flag -fPIC to allow for the libraries to be located at any position in the computer's main memory. Without this flag, a 'relocation truncated to fit' error will result when linking FLEXPART. | ||
| − | If the compilers are not set to generate 64-bit binaries by default, the flag <code> -m64 </code> should be included for FLEXPART and the external libraries. | + | If the compilers are not set to generate 64-bit binaries by default, the flag <code>-m64 </code> should be included for FLEXPART and the external libraries. |
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| − | + | All of the required settings for FLEXPART are already made in the cmake configuration files (cmake directory) included in the FLEXPART distribution. | |
| − | + | <br />Recommended compilation steps using the gfortran or intel compiler | |
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| − | </ | ||
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| − | + | * JPEG compression is used FLEXPART WINDFIELDS and this requires to compile GRIB-API with jpeg support ([http://www.ece.uvic.ca/~frodo/jasper/ JASPER] library). On UIO servers GRIB-API and Jasper are already installed. | |
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| − | ./ | ||
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| − | + | <br />Even if you wish to compile your own FLEXPART version, the best is to set-up your environment by loading an existing version of flexpart: | |
| − | + | To set-up your environment: | |
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| − | + | <pre> module load flexpart</pre> | |
| − | + | <br />You then get the right set of compilers and libraries to compile your own version of FLEXPART. Use the following environment variables: | |
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| − | </ | ||
| − | + | *'''GRIB_API_HOME''': points to the directory where GRIB-API has been installed | |
| − | + | *'''FLEXPART_HOME''': points to the directory where FLEXPART_HOME has been installed. | |
| + | *'''FLEXPART_HOME/src''': points to the source code used to compile FLEXPART. the corresponding Makefile is also available in the same src directory. (on abel search for *_abel or use makefile.ecmwf_ifort_geo and on sverdrup for *_geo*) | ||
Latest revision as of 10:38, 26 April 2017
FLEXPART has been compiled on UIO servers so if you do not need to modify the source code, we suggest you use the pre-compiled version. If you have never used FLEXPART, the pre-compiled version is also helpful to become familiar with this new package. Some tutorials/examples are available on UIO servers.
Compiling FLEXPART in a 64-bit environment
This file describes the required compiler flags for compiling FLEXPART in a 64-bit computing environment for the gfortran compiler (version 4.2 and onward) and absoft compiler (version 10.1).
Using 64-bit environment brings the advantage of using >2GB main memory for FLEXPART data arrays. However, this requires certain adjustments to the compilation settings of FLEXPART and the external libraries GRIB_API and JASPER (the latter as required by GRIB_API).
The main point to be considered for running FLEXPART in a 64-bit environment is the possiblity to allocate data arrays >2GB. This requires to use the compiler flag -mcmodel=medium. Note that this memory model slows down calculations, if data arrays of less than 2GB are allocated, the use of -mcmodel=small is said to provide slightly better performance.
An additional requirement is that the external libraries must be compiled with the flag -fPIC to allow for the libraries to be located at any position in the computer's main memory. Without this flag, a 'relocation truncated to fit' error will result when linking FLEXPART.
If the compilers are not set to generate 64-bit binaries by default, the flag -m64 should be included for FLEXPART and the external libraries.
All of the required settings for FLEXPART are already made in the cmake configuration files (cmake directory) included in the FLEXPART distribution.
Recommended compilation steps using the gfortran or intel compiler
- JPEG compression is used FLEXPART WINDFIELDS and this requires to compile GRIB-API with jpeg support (JASPER library). On UIO servers GRIB-API and Jasper are already installed.
Even if you wish to compile your own FLEXPART version, the best is to set-up your environment by loading an existing version of flexpart:
To set-up your environment:
module load flexpart
You then get the right set of compilers and libraries to compile your own version of FLEXPART. Use the following environment variables:
- GRIB_API_HOME: points to the directory where GRIB-API has been installed
- FLEXPART_HOME: points to the directory where FLEXPART_HOME has been installed.
- FLEXPART_HOME/src: points to the source code used to compile FLEXPART. the corresponding Makefile is also available in the same src directory. (on abel search for *_abel or use makefile.ecmwf_ifort_geo and on sverdrup for *_geo*)
