ADIOS v2.7.0 Production Release

Summary

This is a major production release with a variety of new features and bug fixes in the areas of staging, HDF5 compatibility, and writer aggregation.

Features

New features

• Hierarchical traversing for reading ADIOS files using the new Group object
  • This is an optional, alternative way to go over the variables and attributes in a file/stream in a similar fashion as one traverses HDF5 files.
• Default aggregation mode has changed to 1 sub-file per compute node (from one sub-file per process)
• DataMan engine supports compression (used for wide-area-network data transfers)
• SSC engine supports flexible I/O pattern
• Step selection for reading
• Simplified wrapper bp2h5 for the adios2_reorganize utility for converting ADIOS BP files to HDF5 files.

HDF5 Virtual Object Layer (VOL) Plugin for ADIOS

• Added a VOL plugin to enable ADIOS I/O through the HDF5 API. Basic functionalities are covered.
• Enables existing HDF5 clients to create and access ADIOS files with minimal effort.

API Changes

• Double pointer Get API for the Inline engine
• AggregatorRatio option to set number of sub-files as a ratio of number of processes. NumAggregators option is used to set a fixed number of sub-files. See options for https://adios2.readthedocs.io/en/latest/engines/engines.html#bp4