ecTrans
ecTrans is the global spherical Harmonics transforms library, extracted from the IFS. It is using a hybrid of MPI and OpenMP parallelisation strategies. The package contains both single- and double precision Fortran libraries (trans_sp, trans_dp), as well as a C interface to the double-precision version (transi_dp)
Trans is distributed under the Apache License Version 2.0.
See LICENSE file for details.
- Linux
- Apple MacOS
Other UNIX-like operating systems may work too out of the box.
- Fortran compiler with OpenMP support
- C compiler
- FIAT (see https://github.com/ecmwf-ifs/fiat )
- ecBuild (see https://github.com/ecmwf/ecbuild)
- CMake (see https://cmake.org)
- A BLAS library
Further optional recommended dependencies:
- FFTW (http://www.fftw.org)
Building and installing Trans happens via CMake, which provides automatic detection for third-party libraries in standard locations and helps cross-plaform portability. There are multiple ways to help CMake discover packages in non-standard locations. One explicit way is to e.g. set environment variables for each dependency.
Environment variables
$ export ecbuild_ROOT=<path-to-ecbuild>
$ export fiat_ROOT=<path-to-fiat>
$ export CC=<path-to-C-compiler>
$ export FC=<path-to-Fortran-compiler>
You must compile FIAT out-of-source, so create a build-directory (anywhere)
$ mkdir build && cd build
Configuration of the build happens through standard CMake
$ cmake
Extra options can be added to the cmake command to control the build:
-DCMAKE_BUILD_TYPE=<Debug|RelWithDebInfo|Release|Bit>default=RelWithDebInfo (typically-O2 -g)-DENABLE_TESTS=<ON|OFF>default=ON-DENABLE_SINGLE_PRECISION=<ON|OFF>default=ON-DENABLE_DOUBLE_PRECISION=<ON|OFF>default=ON-DENABLE_TRANSI=<ON|OFF>default=ON-DENABLE_MKL=<ON|OFF>default=ON-DCMAKE_INSTALL_PREFIX=<install-prefix>
More options to control compilation flags, only when defaults are not sufficient
-DCMAKE_Fortran_FLAGS=<fortran-flags>-DCMAKE_C_FLAGS=<c-flags>
Once this has finished successfully, run make and make install.
Optionally, tests can be run to check succesful compilation, when the feature TESTS is enabled (-DENABLE_TESTS=ON, default ON)
$ ctest
TODO
TODO