UCC is a collective communication operations API and library that is flexible, complete, and feature-rich for current and emerging programming models and runtimes.

• Design Goals
• API
• Building
• Community
• Contributing
• License

• Highly scalable and performant collectives for HPC, AI/ML and I/O workloads
• Nonblocking collective operations that cover a variety of programming models
• Flexible resource allocation model
• Support for relaxed ordering model
• Flexible synchronous model
• Repetitive collective operations (init once and invoke multiple times)
• Hardware collectives are a first-class citizen

Thanks for your interest in contributing to UCC, please see our technical and legal guidelines in the contributing file.

UCC is BSD-style licensed, as found in the LICENSE file.

• UCX

  • UCC uses utilities provided by UCX's UCS component

• Doxygen

  • UCC uses Doxygen for generating API documentation

$./autogen.sh

$./configure --prefix=<ucc-install-path> --with-ucx=<ucx-install-path>

$make 

$./autogen.sh

$./configure --prefix=<ucc-install-path> --with-docs-only

$make docs

• UCX/UCP
  • InfiniBand, ROCE, Cray Gemini and Aries, Shared Memory
• NCCL