The Adaptable Input Output System version 2 (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:

Performance I/O scalability in high performance computing (HPC) applications.
Adaptability unified interfaces to allow for several modes of transport (files, memory-to-memory)
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.

Usage

Version	module name
2.6.0	adios2/2.6.0

Links

Documentation is hosted at https://adios2.readthedocs.io/.

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