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libucxx-cu12

library0.50.0pypypi✓ verified 80d ago

Python Bindings for the Unified Communication X library (UCX), including CUDA 12 support. Provides high-performance communication primitives for distributed computing, commonly used in RAPIDS ecosystem. Current version: 0.49.0, part of the RAPIDS suite, released monthly.

data ai-ml http-networking

pip install libucxx-cu12

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · LIBUCXX-CU12

libucxx-cu12

datapythonv0.50.0

Install

4.0s avg

Import

—

Disk

125MB

Pass rate

5/ 10

Env Coverage5 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.50.0 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

build_error

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 4.0s · import 0.000s · 133MB

125MB installed

● package 125MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

load

✓ from libucxx import load

✗ from ucp import UCXListener

load_library

✓ from libucxx import load_library

Quickstart example using UCX-Py (the Python bindings). Note: libucxx-cu12 is the CUDA 12 variant; actual usage is via the `ucp` module.

import ucp async def server(ep): msg = await ep.recv(1024) print(f"Received: {msg}") await ep.send(b"pong") async def main(): listener = ucp.create_listener(server, port=13337) ep = await ucp.create_endpoint(ucp.get_address(), 13337) await ep.send(b"ping") reply = await ep.recv(1024) print(f"Reply: {reply}") listener.close() ucp.init() ucp.get_worker().run()

Debug

Known issues

gotchaThe PyPI package name is `libucxx-cu12` but the import is `ucp`. Installing libucxx-cu12 provides the `ucp` Python module.

fix

Import as `import ucp`.

affects: all

breakingVersion 0.49.0 removed the numba-cuda runtime dependency in favor of cuda-core. Code relying on numba-cuda interop may need updates.

fix

If you use numba-cuda with UCX, switch to cuda-core based API.

affects: >=0.49.0

breakingVersion 0.47.0 requires CUDA 12.2+. Systems with older CUDA will encounter compatibility issues.

fix

Update CUDA to 12.2 or later, or pin to an older libucxx-cu12 version.

affects: >=0.47.0

gotchaThe package name includes '-cu12' which is specific to CUDA 12. For CUDA 11, use 'libucxx-cu11'.

fix

Ensure you install the correct variant matching your CUDA version.

affects: all

deprecatedThe `ucp` module is the recommended interface. Some older docs reference `ucxx` directly.

fix

Use `import ucp` instead of `import ucxx`.

affects: all

Upgrade

Version history

0.50.0latest on PyPI · released Jun 9, 2026

Audit

Dependencies

ucx-pyoptionallibucxx-cu12 provides Python bindings on top of UCX, but the actual UCX library may be needed.

Agent activity

12 hits · last 30 days

node

Resources

githubhttps://github.com/rapidsai/ucxx ↗

packagehttps://pypi.org/project/libucxx-cu12/ ↗

homepagehttps://ucx.openucx.org ↗