Scot Breitenfeld
baa83db280
Three corrections to the section documenting the PR #50 patch:
- The mechanism was misattributed. The section said the CPU evaluates
"fp64 != 0.0" as if a subnormal operand were 0.0 under FTZ. It does not:
ucomisd, which is what GCC emits there on x86-64, ignores DAZ, and a GCC
build with FTZ+DAZ forced on via SSE intrinsics parses 5e-324 correctly
without the patch at all. The failure is a compile-time one -- icx's
-fp-model=fast lets the compiler assume no operand is subnormal and every
operand is finite. Upstream issue #49 carries the same error and has not
been corrected yet.
- The described fix was the pre-review one. Updated to match what is now
vendored: mask the sign bit, test the exponent bits, no isfinite().
- Added a "What this patch does not fix" subsection. Where the libc flushes
inside strtod() itself -- Windows Intel oneAPI and MSYS2 clangarm64, per
the tfilter2 probe added in 2761464 -- the bits really are zero and no
bit-pattern test can recover the value. The README previously read as
though PR #50 covered that case; it does not, and tfilter2's runtime probe
is what handles it.
Also retitled the section and updated the step 4b grep hint to fp64_mag,
which is the token that now identifies the patch.
What is HDF5?
This repository contains a high-performance library's source code and a file format specification that implements the HDF5® data model. The model has been adopted across many industries, and this implementation has become a de facto data management standard in science, engineering, and research communities worldwide.
The HDF Group is the developer, maintainer, and steward of HDF5 software. Find more information about The HDF Group, the HDF5 Community, and other HDF5 software projects, tools, and services at The HDF Group's website.
Quick Start
-
New to HDF5? Start with the INSTALL.md guide for compilation and installation instructions.
-
Ready to build? See INSTALL_CMake.md for CMake-based builds.
-
Running on HPC? Check out README_HPC.md for parallel HDF5 configuration.
Table of Contents
- What is HDF5?
- Quick Start
- Documentation
- Help and Support
- Forum and News
- Release Schedule
- Downloads and Source Code
- Java Maven Artifacts
- Contributing
- How to Cite HDF5
- Build Status
Documentation
Documentation for all HDF software is available at:
- All HDF Documentation: https://support.hdfgroup.org/documentation/index.html
- Latest HDF5 Library: https://support.hdfgroup.org/documentation/hdf5/latest
See the CHANGELOG.md file in the release_docs/ directory for information specific to the features and updates included in this release of the library.
Platform-Specific Guides
Several files in the docs/ directory provide platform-specific details:
| File | Description |
|---|---|
| INSTALL | General compilation and installation instructions (start here) |
| INSTALL_CMake.md | Building with CMake |
| README_HPC.md | Building and configuring Parallel HDF5 on HPC systems |
| INSTALL_Windows.md | Windows installation |
| INSTALL_Cygwin.md | Cygwin installation |
| USING_HDF5_CMake.md | Building HDF5 applications with CMake |
| USING_CMake_Examples.md | Building and testing HDF5 examples with CMake |
Help and Support
The HDF Group staffs a free Help Desk accessible at https://help.hdfgroup.org and also monitors the Forum. Our free support service is community-based and handled as time allows. We'll do our best to respond to your question as soon as possible, but please note that response times may vary depending on the complexity of the issue and staff availability.
If you're interested in guaranteed response and resolution times, a dedicated technical account manager, and more benefits (all while supporting the open-source work of The HDF Group), please check out Priority Support.
Forum and News
The HDF Forum is provided for public announcements, technical questions, and discussions of interest to the general HDF5 Community.
These forums are provided as an open and public service for searching and reading. Posting requires completing a simple registration and allows one to join in the conversation. Please read the quickstart guide for more information on how to get started.
Release Schedule
HDF5 does not follow a regular release schedule. Instead, updates are based on the introduction of new features and the resolution of bugs. However, we aim to have at least one annual release for each maintenance branch. The chart above shows past HDF5 releases that have reached end of life (EOL).
Release Progress
The badges below track the release currently in development.
The Next Release badge shows the in-development version (derived from H5_VERS_MAJOR/H5_VERS_MINOR in
src/H5public.h), annotated with the target due date of the matching GitHub milestone when one is
set. The Latest Release badge shows the most recently published release in that same major series, with its
release date. The badges below them show the current progress of critical, high, medium, and
low priority issues for the in-development release, with colors that reflect completion status:
- 🟢 Green (90%+): Readying for Deployment - most issues completed
- 🟡 Yellow (60-89%): Nearing Completion - on track for release
- 🟠 Orange (40-59%): In Development - attention needed
- 🔴 Red (<40%): Initial Phase - significant issues remain
Click the badges to view the detailed project board with current release items.
Downloads and Source Code
Snapshots and Releases
- Development Snapshots: https://github.com/HDFGroup/hdf5/releases/tag/snapshot
- Latest Release: https://github.com/HDFGroup/hdf5/releases
- Previous Releases: https://support.hdfgroup.org/archive/support/ftp/HDF5/releases/index.html
- Development Code: https://github.com/HDFGroup/hdf5.git
HPC Testing Results
View HPC configure/build/test results on CDash
Java Maven Artifacts
HDF5 Java bindings and examples are available as Maven artifacts. For detailed usage instructions including dependency configuration, repository setup, and platform-specific builds, see HDF5Examples/JAVA/README-MAVEN.md.
Contributing
We welcome contributions to HDF5! Whether you're fixing bugs, adding features, or improving documentation, your help is appreciated.
How to Contribute
- Report Issues: Use our GitHub Issues to report bugs or request features
- Submit Pull Requests: Fork the repository, make your changes, and submit a PR
- Join Discussions: Participate in the HDF Forum
For detailed contribution guidelines, please contact us through the Help Desk.
How to Cite HDF5
If you use HDF5 in your research, please cite it. This repository includes a CITATION.cff file containing standard citation metadata.
Quick DOI: 10.5281/zenodo.17808558
Build Status
Click to expand detailed build status
Continuous Integration
Integration Testing
HDF5 filter plugins testing
VOL and VFD Testing
