# openucx/ucx

Unified Communication X  (mailing list - https://elist.ornl.gov/mailman/listinfo/ucx-group)

Repository: https://github.com/openucx/ucx
Canonical: https://ross.abutalabs.com/products/ucx
Homepage: http://www.openucx.org
Language: C
License: NOASSERTION
License Family: other
Topics: rdma, hpc, networking, infiniband, cray, shared-memory, mpi, shmem, c, c-plus-plus, verbs, pgas, roce, iwarp, gemini, aries, drivers, openshmem, tcp-ip, hacktoberfest
Last push: 2026-08-26T13:57:00+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 84, longevity 100
- inputs: {"age_days": 4338, "days_push": 7, "days_rel": 30, "gap_med": 90, "n_releases_24m": 8}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1696, forks 593 (observed 2026-08-28T04:05:23.867943+00:00)

## What it is
Unified Communication X (UCX) is a production-grade, open-source communication framework for high-bandwidth, low-latency networks. It exposes abstract communication primitives that leverage RDMA (InfiniBand/RoCE), TCP, shared memory, GPUs, and network atomic offloads.

## Use cases
- accelerate MPI communication over InfiniBand
- build high-performance computing applications with low-latency networking
- use RDMA and shared memory transports behind a single API
- enable GPU-aware communication between nodes
- run OpenSHMEM or PGAS workloads over modern interconnects
- reduce software overhead in the communication path of data-centric applications

## When to choose
- you need near-native network performance for HPC or data-centric applications
- you want one API abstracting InfiniBand, RoCE, TCP, shared memory, and GPU transports
- you are building MPI, OpenSHMEM, or other parallel programming runtimes

## When to avoid
- you only need simple TCP/HTTP networking for web applications
- you want a high-level messaging API rather than low-level communication primitives
- your project does not require extreme low-latency or high-bandwidth networking

## Facets
- artifact type: library
- maturity: stable
- function: networking, rpc
- domain: networking, microservices, performance, developer-tools
- platform: cpp, c, cross-platform
- tags: rdma, hpc, infiniband, shared-memory, mpi, high-performance-computing, communication-framework, linux, gpu

## Member repositories
- openucx/ucx (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:23.867943+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:37:54.600463+00:00, confidence not recorded.
  - readme: https://github.com/openucx/ucx (fetched 2026-08-28T04:05:23.867943+00:00, sha 33a5a075a507)
  - homepage: http://www.openucx.org (fetched 2026-08-29T11:12:49.575821+00:00, sha 9dc0f581b1d9)
  - site_page: https://openucx.org/documentation (fetched 2026-08-29T11:12:49.584719+00:00, sha 954ab938cada)
- Data as of 2026-08-30T08:39:29.467469+00:00.