openucx/ucx

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

1696 stars · 593 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

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

library · maturity stable

networking rpc networking microservices performance developer-tools cpp c cross-platform rdma hpc infiniband shared-memory mpi high-performance-computing communication-framework linux gpu

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