multio
======
[](https://github.com/ecmwf/multio/actions/workflows/ci.yml?query=branch%3Adevelop)
[](https://github.com/ecmwf/multio/blob/develop/LICENSE)
multio is a package developed by ECMWF that provides an application programming interface (API) for
* I/O-server functionality for distributed earth-system models,
* post-processing pipelines of user-programmable list of actions.
The fundamental design principle behind multio is that data is decoupled from metadata, and that the
metadata is used for routing the data through the post-processing pipelines.
Documentation
------------
The documentation can be found at https://multio.readthedocs.io.
Requirements
------------
Runtime dependencies:
- eccodes -- http://github.com/ecmwf/eccodes
- eckit -- http://github.com/ecmwf/eckit
- metkit -- http://github.com/ecmwf/metkit
Optional runtime dependencies:
- fdb -- http://github.com/ecmwf/fdb
- fckit -- http://github.com/ecmwf/fckit (for the fortran example code only)
Build dependencies:
- CMake -- For use and installation see http://www.cmake.org/
- ecbuild -- ECMWF library of CMake macros (available via apt or see https://github.com/ecmwf/ecbuild)
- MPI -- an implementation of MPI may be required for the I/O-server functionality, see https://www.mpi-forum.org/
Installation
------------
multio employs an out-of-source build/install based on CMake.
Make sure ecbuild is installed and the ecbuild executable script is found ( `which ecbuild` ).
Now proceed with installation as follows.
1. Set up environment as appropriate
```bash
srcdir=$(pwd)
builddir=build
installdir=$HOME/local
```
2. Run Cmake/ecbuild
```bash
ecbuild --prefix=$installdir -- -DCMAKE_PREFIX_PATH=<path/to/dependencies/install> $srcdir
```
The package is in active development and the I/O-server functionality is not enabled by default, so
it needs to be turned on explicitly. In addition, if built with FDB support, some compilers will
require linking to be forced.
```bash
ecbuild --prefix=$installdir -- -DCMAKE_PREFIX_PATH=<path/to/dependencies/install> -DECBUILD_EXE_LINKER_FLAGS=-Wl,--no-as-needed $srcdir
```
3. Compile, test and install
```bash
make -j10
ctest
make install
```
Copyright and license
------------
(C) Copyright 2005- ECMWF.
This software is licensed under the terms of the Apache Licence Version 2.0 which can be obtained at
http://www.apache.org/licenses/LICENSE-2.0.
In applying this licence, ECMWF does not waive the privileges and immunities granted to it by virtue
of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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