ADIOS v2.1.0 Beta Release

This is the second pre-release of the ADaptable Input Output System, ADIOS, version 2 (v2.1.0). This is a beta release with 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 v2.0.0 Alpha release include:

• Re-designed Read and Write APIs for uniformity between the two
• Native read and write support for the ADIOS BP format
• Read and write support for parallel and serial HDF5
• Full support for C, Fortran, and Python APIs in addition to the native C++ interface.
• Initial staging implementations with SST for HPC environments and DataMan for Wide Area Networks.

Feature	ADIOS 1.12 Support	ADIOS 2.1.0 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	✅	✅
BP1 Format	✅	✅ (bitmap stats deprecated)
BP2 Format	---	❌
I/O Modes	✅ (Transports)	partial
BP1 File N-to-N	✅ (POSIX)	✅
BP1 File N-to-M	✅ (MPI_Aggregate)	❌
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	✅	✅ Still to do
Other
Automated testing	❌	✅ (via CTest and GoogleTest)
Windows support	❌	✅ (via CTest and GoogleTest)