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MultIO is a runtime-configurable multiplexer for Weather Model output of GRIB data

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multio
======

[![Build Status](https://img.shields.io/github/actions/workflow/status/ecmwf/multio/ci.yml?branch=develop)](https://github.com/ecmwf/multio/actions/workflows/ci.yml?query=branch%3Adevelop)
[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](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
   ```

GIT hooks
---------

Please run the following command in the project root to use our git hooks:
```bash
git config core.hooksPath .githooks
```

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.

multio

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