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# ADIOS2 : The Adaptable Input Output System version 2
This is ADIOS2: The Adaptable Input/Output (I/O) System.
ADIOS2 is developed as part of the United States Department of Energy's Exascale Computing Project.
It is a framework for scientific data I/O to publish and subscribe to data when and where required.
ADIOS2 transports data as groups of self-describing variables and attributes across different media types (such as files, wide-area-networks, and remote direct memory access) using a common application programming interface for all transport modes.
ADIOS2 can be used on supercomputers, cloud systems, and personal computers.
ADIOS2 focuses on:
1. **Performance** I/O scalability in high performance computing (HPC) applications.
2. **Adaptability** unified interfaces to allow for several modes of transport (files, memory-to-memory)
3. **Ease of Use** two-level application programming interface (APIs)
* Full APIs for HPC applications: C++11, Fortran 90, C 99, Python 2 and 3
* Simplified High-Level APIs for data analysis: Python 2 and 3, C++11, Matlab
In addition, ADIOS2 APIs are based on:
* **MPI** Although ADIOS2 is MPI-based, it can also be used in non-MPI serial code.
* **Data Groups** ADIOS2 favors a deferred/prefetch/grouped variables transport mode by default to maximize data-per-request ratios.
Sync mode, one variable at a time, is treated as the special case.
* **Data Steps** ADIOS2 follows the actual production/consumption of data using an I/O “steps” abstraction removing the need to manage extra indexing information.
* **Data Engines** ADIOS2 Engine abstraction allows for reusing the APIs for different transport modes removing the need for drastic code changes.
## Documentation
Documentation is hosted at [readthedocs](https://adios2.readthedocs.io).
## Citing
If you find ADIOS2 useful, please cite our [SoftwareX paper](https://doi.org/10.1016/j.softx.2020.100561), which also gives a high-level overview to the motivation and goals of ADIOS; complementing the documentation.
## Getting ADIOS2
* From source: [Install ADIOS2 documentation](https://adios2.readthedocs.io/en/latest/setting_up/setting_up.html#).
For a `cmake` configuration example see [scripts/runconf/runconf.sh](https://github.com/ornladios/ADIOS2/blob/master/scripts/runconf/runconf.sh)
* Conda packages:
* [https://anaconda.org/conda-forge/adios2](https://anaconda.org/conda-forge/adios2)
* Spack: [adios2 package](https://spack.readthedocs.io/en/latest/package_list.html#adios2)
* Docker images: under [scripts/docker](https://github.com/ornladios/ADIOS2/tree/master/scripts/docker)
Once ADIOS2 is installed refer to:
* [Linking ADIOS2](https://adios2.readthedocs.io/en/latest/setting_up/setting_up.html#linking-adios-2)
## Releases
* Latest release: [v2.10.0](https://github.com/ornladios/ADIOS2/releases/tag/v2.10.0)
* Previous releases: [https://github.com/ornladios/ADIOS2/releases](https://github.com/ornladios/ADIOS2/releases)
## Community
ADIOS2 is an open source project: Questions, discussion, and contributions are welcome. Join us at:
- Mailing list: adios-ecp@kitware.com
- Github Discussions: https://github.com/ornladios/ADIOS2/discussions
## Reporting Bugs
If you find a bug, please open an [issue on ADIOS2 github repository](https://github.com/ornladios/ADIOS2/issues)
## Contributing
See the [Contributor's Guide to ADIOS 2](Contributing.md) for instructions on how to contribute.
## License
ADIOS2 is licensed under the Apache License v2.0.
See the accompanying [Copyright.txt](Copyright.txt) for more details.
## Directory layout
* bindings - public application programming interface, API, language bindings (C++11, C, Fortran, Python and Matlab)
* cmake - Project specific CMake modules
* examples - Simple set of examples in different languages
* scripts - Project maintenance and development scripts
* source - Internal source code for private components
* adios2 - source directory for the ADIOS2 library to be installed under install-dir/lib/libadios2.
* utils - source directory for the binary utilities, to be installed under install-dir/bin
* testing - Tests using [gtest](https://github.com/google/googletest)
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