ADIOS v2.1.1 Staging Beta Release

This is the third pre-release of the ADaptable Input Output System, ADIOS, version 2 (v2.1.1). This is a beta release with staging support and a stable API intended for users and developers to begin integration and testing of ADIOS 2 into their applications, libraries, and workflows. This version is not intended for production quality purposes.

Major additions from the previous v2.1.0 Beta release include:

• SST Engine for staging data memory-to-memory across applications
• Updated Fortran, C and Python bindings APIs
• Several bugs corrected for default write and read BPFile engine
• Added option for flexible number of substreams (subfiles) based on MPI aggregation for NxM writes (N=mpi processes, M = user defined number of files)
• Added High-Level APIs to each supported language. These APIs are based on the language native IO (C++: adios2::fstream, C: adios2_FILE*, Fortran: file handler, Python: io stream object)
• User Guide documentation moved to readthedocs: http://adios2-adaptable-io-system-version-2.readthedocs.io/en/latest/

Feature	ADIOS 1.13 Support	ADIOS 2.1.1 Support
Write API
Local Variable	✅ (Offsets, LocalDimensions)	✅ (Start, Count)
Global Variable	✅ (Global)	✅ (Variable)
Joined Dimensions	✅	✅
Dimension Variable	✅	deprecated
Constant Dimension Variable	❌	✅
Selection	✅	partial
Memory Selection	✅	❌
Attributes	✅	✅
Transforms	✅	❌
Config XML	✅	✅
Threaded Operations	❌	✅
Time Aggregation	✅	✅
Collective Metadata	✅	✅
BP3 Format	✅	✅ (bitmap stats deprecated)
BP4 Format	---	❌
I/O Modes	✅ (Transports)	beta
BP3 SubFile N-to-N	✅ (POSIX)	✅
BP3 SubFile N-to-M	✅ (MPI_Aggregate)	✅ initial support
HDF5	✅	✅
WAN (DataMan)	❌	✅
Read API	✅	✅
Utils		all compatible with ADIOS1.12
bpmeta	✅	❌
bpls	✅	partial bpls2
bpdump	✅	❌
Language Support
C++	✅ through C	✅ native
Python	✅ Cython	✅ PyBind11
C	✅	✅
Fortran	✅	✅
Other
Automated testing	❌	✅ (via CTest and GoogleTest)
Windows support	❌	✅ (via CTest and GoogleTest)