Openpmd-api

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**Date:** 2024-10-07

ADIOS2 Joined arrays, API simplification, HDF5 subfiling, TOML backend, wildcard file extensions, Performance & Memory

This release adds support for additional I/O features in all backends, and additionally a completely new TOML backend, useful for openPMD-formatted configuration files in scientific workflows.
The ADIOS2 backend now supports joined arrays for simplified storage of particle data in parallel, asynchronous I/O, group tables for enhanced support of ADIOS2 I/O steps, optimized attribute aggregation schemes for large-scale setups and more features.
The HDF5 backend has added support for the "subfiling" virtual file driver intended for I/O performance in large-scale setups, explicit JSON/TOML-based configuration for chunking and independent flushing. The support of exotic datatypes is improved, such as float128 on ARM64/PPC64 and improved support for generically dealing with unknown datatypes.
The JSON backend supports parallel MPI output into separate subfiles, mainly intended for debugging purposes.
The ADIOS1 backend, previously deprecated, has been removed in favor of ADIOS2.
Please consult the upgrade guide for hints on further interacting with old data.

The openPMD-api has been simplified by no longer requiring explicit specification for scalar components via ``RecordComponent::SCALAR`` in its object model.
The addition of wildcard filename extensions (e.g. ``simData.%E`` or ``simData_%T.%E``) simplifies the generic implementation of backend-independent logic, such as post-processing routines.
Rank tables can now be used to pass detailed topology information from writer to reader in staging setups.

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**Date:** 2023-08-18

Python, ADIOS2 and HDF5 Fixes

This release fixed regressions in the Python frontend as well as the ADIOS2 and HDF5 backends.
Supported macOS versions are now 11.0+ and Python versions are 3.8+.

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**Date:** 2023-04-02

Build Regressions

This release fixes build regressions and minor documentation updates for the 0.15.0 release.

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**Date:** 2023-03-25

C++17, Error Recovery, ADIOS2 BP5, Append & Read-Linear Modes, Performance & Memory

This release adds error recovery mechanisms, in order to access erroneous datasets, created e.g. by crashing simulations.
The BP5 engine of ADIOS2 v2.9 is fully supported by this release, including access to its various features for more fine-grained control of memory usage.
Various I/O performance improvements for HDF5 are activated by default.
Runtime configuration of openPMD and its backends, e.g. selection of backends and compression, is now consistently done via JSON, and alternatively via TOML for better readability.
The data storage/retrieval API now consistently supports all common C++ pointer types (raw and smart pointers), implementing automatic memory optimizations for ADIOS2 BP5 if using unique pointers.

The miminum required C++ version is now C++17.
Supported Python versions are Python 3.10 and 3.11.

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**Date:** 2022-06-07

Improve Series Parsing, Python & Fix Backend Bugs

This release improves reading back iterations that overflow the specified zero-pattern.
ADIOS1, ADIOS2 and HDF5 backend stability and performance were improved.
Python bindings got additional wheel platform support and various smaller issues were fixed.

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**Date:** 2022-01-21

Increased Compatibility & Python Install Bug

This release fixes various read/parsing bugs and increases compatibility with upcoming versions of ADIOS and old releases of Intel ``icpc``.
An installation issue for pip-based installs from source in the last release was fixed and Python 3.10 support added.
Various documentation and installation warnings have been fixed.