Unified Communication X (UCX) provides an optimized communication layer for Message Passing (MPI), PGAS/OpenSHMEM libraries and RPC/data-centric applications.
UCX utilizes high-speed networks for inter-node communication, and shared memory mechanisms for efficient intra-node communication.
- UCX version 1.8.0 has a bug that may cause data corruption when TCP transport is used in conjunction with shared memory transport. It is advised to upgrade to UCX version 1.9.0 and above. UCX versions released before 1.8.0 don't have this bug.
Building UCX is typically a combination of running "configure" and "make". Execute the following commands to install the UCX system from within the directory at the top of the tree:
$ ./autogen.sh
$ ./contrib/configure-release --prefix=/where/to/install
$ make -j8
$ make installNOTE: Compiling support for various networks or other specific hardware may require additional command line flags when running configure.
$ ./autogen.sh
$ ./contrib/configure-devel --prefix=$PWD/install-debug*** NOTE: Developer builds of UCX typically include a large performance penalty at run-time because of extra debugging code.
$ make -C test/gtest test$ contrib/buildrpm.sh -s -b$ dpkg-buildpackage -us -uc$ make docsStart server:
$ ./src/tools/perf/ucx_perftest -c 0Connect client:
$ ./src/tools/perf/ucx_perftest <server-hostname> -t tag_lat -c 1Note: the -c flag sets CPU affinity. If running both commands on same host, make sure you set the affinity to different CPU cores.
UCX is licensed as:
In order to contribute to UCX, please sign up with an appropriate Contributor Agreement.
Follow these instructions when submitting contributions and changes.
To reference UCX in a publication, please use the following entry:
@inproceedings{shamis2015ucx,
title={UCX: an open source framework for HPC network APIs and beyond},
author={Shamis, Pavel and Venkata, Manjunath Gorentla and Lopez, M Graham and Baker, Matthew B and Hernandez, Oscar and Itigin, Yossi and Dubman, Mike and Shainer, Gilad and Graham, Richard L and Liss, Liran and others},
booktitle={2015 IEEE 23rd Annual Symposium on High-Performance Interconnects},
pages={40--43},
year={2015},
organization={IEEE}
}To reference the UCX website:
@misc{openucx-website,
title = {{The Unified Communication X Library}},
key = {{{The Unified Communication X Library}},
howpublished = {{\url{http://www.openucx.org}}}
}| Component | Role | Description |
|---|---|---|
| UCP | Protocol | Implements high-level abstractions such as tag-matching, streams, connection negotiation and establishment, multi-rail, and handling different memory types |
| UCT | Transport | Implements low-level communication primitives such as active messages, remote memory access, and atomic operations |
| UCS | Services | A collection of data structures, algorithms, and system utilities for common use |
| UCM | Memory | Intercepts memory allocation and release events, used by the memory registration cache |
- Infiniband
- Omni-Path
- RoCE
- Cray Gemini and Aries
- CUDA
- ROCm
- Shared Memory
- TCP/IP