openPMD/openPMD-api

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:floppy_disk: C++ & Python API for Scientific I/O

Stars: 161
Forks: 59
Open beginner issues: 0
Indexed issues: 184
Avg merge: 2d 22h
Merged PRs (30d): 7

Dominant language: C++
License: LGPL-3.0
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 16, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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184 open issues indexed

Pickle: Mesh points at wrong series after deserializing Open

affects latest release bug frontend: Python3

Difficulty 4/5 3-5 days Newbie friendliness 50/100

openPMD/openPMD-api#1919 · 6 comments · Opened Jul 16, 2026
ADIOS2 Engine Used at Runtime Open

backend: ADIOS2 feature request frontend: C++17 frontend: Python3

Difficulty 4/5 3-5 days Newbie friendliness 48/100

openPMD/openPMD-api#1913 · 1 comment · Opened Jul 8, 2026
BP4 silently drops attribute-only iterations written through the steps API Open

affects latest release backend: ADIOS2 bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

openPMD/openPMD-api#1912 · 1 comment · Opened Jul 8, 2026
Conditionally Install CMake CPS Files Open

feature request install

openPMD/openPMD-api#1865 · 1 assignee · Opened Mar 23, 2026
Overhead with variable-based `bp5` series Open

affects latest release backend: ADIOS2 bug performance

openPMD/openPMD-api#1859 · 18 comments · 1 reaction · 3 assignees · Opened Mar 4, 2026
New static assert from pybind11--3.0.2 prevents compilation Open

affects latest release bug frontend: Python3

Difficulty 3/5 1-2 days Newbie friendliness 45/100

openPMD/openPMD-api#1850 · 2 comments · Opened Feb 17, 2026
OpenPMD C API Open

discussion frontend: C99/11

openPMD/openPMD-api#1848 · 1 comment · 1 reaction · 2 assignees · Opened Feb 16, 2026
`Dataset`: ArrayInterface Overload Open

feature request frontend: Python3 good first issue

Difficulty 3/5 1-2 days Newbie friendliness 68/100

openPMD/openPMD-api#1831 · 4 comments · Opened Jan 13, 2026
Examples: Literal Include Open

documentation tests

openPMD/openPMD-api#1822 · 1 assignee · Opened Dec 17, 2025
Wrong dimensionality of default attributes Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

openPMD/openPMD-api#1815 · 2 comments · Opened Dec 5, 2025
opmd matplotlib.pylab crash (depending on import order) Open

bug frontend: Python3 install machine/system

Difficulty 4/5 3-5 days Newbie friendliness 35/100

openPMD/openPMD-api#1792 · 13 comments · 1 reaction · Opened Oct 13, 2025
Skip PerformPut for BP5 Open

backend: ADIOS2 feature request

openPMD/openPMD-api#1751 · 2 comments · 1 assignee · Opened Apr 29, 2025
Paraview and VisIt readers read the same dataset differently (and both incorrectly) Open

bug third party

Difficulty 4/5 3-5 days Newbie friendliness 30/100

openPMD/openPMD-api#1709 · 4 comments · 1 reaction · Opened Dec 23, 2024
do data layout transpose internally when reading chunks Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

openPMD/openPMD-api#1708 · Opened Dec 23, 2024
JSON/TOML arguments for all Series constructor arguments Open

api: new feature request

Difficulty 5/5 Over a week Newbie friendliness 30/100

openPMD/openPMD-api#1685 · 1 comment · Opened Oct 14, 2024
pip install from source fails due to internal compiler error with gcc 13.2.0 (only on x86-64) Open

install

Difficulty 4/5 3-5 days Newbie friendliness 28/100

openPMD/openPMD-api#1665 · 1 comment · Opened Aug 28, 2024
Virtual Records (Derived Variables) Open

backend: ADIOS2

Difficulty 5/5 Over a week Newbie friendliness 25/100

openPMD/openPMD-api#1664 · Opened Aug 19, 2024
Python Object Comparison Support Open

feature request frontend: Python3

Difficulty 5/5 Over a week Newbie friendliness 25/100

openPMD/openPMD-api#1658 · Opened Aug 5, 2024
file based bp5 writer hang Open

affects latest release backend: ADIOS2 bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

openPMD/openPMD-api#1655 · 5 comments · 1 reaction · Opened Jul 25, 2024
Combine multiple files into a single file Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

openPMD/openPMD-api#1647 · 2 comments · Opened Jul 10, 2024
Performance: Attribute reading in the HDF5 backend is implemented inefficiently Open

backend: HDF5

Difficulty 4/5 3-5 days Newbie friendliness 35/100

openPMD/openPMD-api#1639 · Opened Jun 21, 2024
Wheels: Emscripten/wasm/Pyodide Open

continuous integration frontend: Python3

Difficulty 5/5 Over a week Newbie friendliness 25/100

openPMD/openPMD-api#1636 · 1 comment · Opened Jun 14, 2024
Wheels: ARM64 (Linux/Windows) Open

continuous deployment frontend: Python3

Difficulty 4/5 3-5 days Newbie friendliness 45/100

openPMD/openPMD-api#1635 · Opened Jun 14, 2024
set SI units Open

question

Difficulty 3/5 1-2 days Newbie friendliness 35/100

openPMD/openPMD-api#1622 · 5 comments · Opened May 23, 2024
Simple slicing for chunked data Open

question

Difficulty 5/5 Over a week Newbie friendliness 35/100

openPMD/openPMD-api#1617 · 1 comment · Opened Apr 29, 2024
Unfortunate convention `io` Open

frontend: Python3 question

openPMD/openPMD-api#1593 · 4 comments · 1 reaction · 1 assignee · Opened Feb 5, 2024
Current best practice for block structured AMR Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

openPMD/openPMD-api#1588 · 1 comment · Opened Jan 12, 2024
how to rescale axis lengths to work around downstream bugs? Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

openPMD/openPMD-api#1579 · 10 comments · Opened Dec 19, 2023
documentation: mention that ParaView (Windows) and VisIt (all platforms) can't read BP5 files Open

question third party

Difficulty 1/5 1-3 hours Newbie friendliness 35/100

openPMD/openPMD-api#1576 · 5 comments · Opened Dec 18, 2023
Query backend versions Open

backend discussion feature request frontend: C++17 frontend: Python3 help wanted

Difficulty 4/5 3-5 days Newbie friendliness 42/100

openPMD/openPMD-api#1563 · 1 comment · Opened Dec 1, 2023
CI is very slow Open

continuous integration feature request

Difficulty 4/5 3-5 days Newbie friendliness 25/100

openPMD/openPMD-api#1538 · 2 comments · 1 reaction · Opened Oct 15, 2023
Use file based encoding to store BTD files with BP5 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

openPMD/openPMD-api#1531 · Opened Oct 2, 2023
C API Open

frontend: C99/11

openPMD/openPMD-api#1529 · 2 comments · 1 assignee · Opened Sep 25, 2023
Improper use of `set_const` Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

openPMD/openPMD-api#1526 · 4 comments · Opened Sep 5, 2023
Debugging a New File Open

backend: HDF5 question

openPMD/openPMD-api#1525 · 5 comments · 1 assignee · Opened Aug 31, 2023
HDF5: Remove Support for Old Versions Open

backend: HDF5 MPI

openPMD/openPMD-api#1514 · 6 comments · 1 assignee · Opened Aug 18, 2023
ADIOS2: Non-MPI Parallel Reads (DASK) Open

backend: ADIOS2 frontend: C++17 frontend: Python3

openPMD/openPMD-api#1500 · 2 reactions · 1 assignee · Opened Aug 9, 2023
Back-Transformed Diagnostics like Tests Open

tests

openPMD/openPMD-api#1499 · 2 comments · 2 assignees · Opened Aug 8, 2023
Add new checks to clang-tidy test Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

openPMD/openPMD-api#1494 · Opened Aug 6, 2023
Passing ADIOS hint Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 30/100

openPMD/openPMD-api#1479 · 1 comment · 1 reaction · Opened Jul 17, 2023
HDF5 files are confusing Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

openPMD/openPMD-api#1468 · 2 comments · Opened Jun 27, 2023
Using preallocated buffers in python Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

openPMD/openPMD-api#1466 · 4 comments · Opened Jun 22, 2023
Problems with reading BP5 output Open

backend: ADIOS2 bug

Difficulty 4/5 3-5 days Newbie friendliness 30/100

openPMD/openPMD-api#1457 · 18 comments · Opened Jun 6, 2023
Python Bindings: Sub-Dir/Build Open

feature request install

openPMD/openPMD-api#1455 · 1 assignee · Opened Jun 5, 2023
MPI-I/O Hints Open

backend: HDF5 help wanted MPI

Difficulty 5/5 Over a week Newbie friendliness 25/100

openPMD/openPMD-api#1449 · 1 comment · Opened May 23, 2023
Using Maps/Dictionaries for attributes corresponding to `axisLabels` Open

feature request

openPMD/openPMD-api#1447 · 1 comment · 2 reactions · 1 assignee · Opened May 19, 2023
Crash with `HDF5` backend due to incompatible `MPI_File_Sync` policy Open

backend: HDF5 MPI question

openPMD/openPMD-api#1423 · 12 comments · 2 assignees · Opened Apr 14, 2023
Read: Close Oldest Iterations Open

api: new

openPMD/openPMD-api#1422 · 2 comments · 1 assignee · Opened Apr 8, 2023
Missing stub files confuse static type checkers Open

feature request frontend: Python3

openPMD/openPMD-api#1385 · 7 comments · 1 reaction · 1 assignee · Opened Mar 2, 2023
Cannot install Open

install question

Difficulty 3/5 1-2 days Newbie friendliness 35/100

openPMD/openPMD-api#1367 · 5 comments · Opened Feb 1, 2023

openPMD/openPMD-api

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