Intel® oneAPI Collective Communications Library

Scalable & Efficient Distributed Training for Deep Neural Networks

Implement Multi-Node Communication Patterns

The Intel® oneAPI Collective Communications Library (oneCCL) enables developers and researchers to more quickly train newer and deeper models. This is done by using optimized communication patterns to distribute model training across multiple nodes.

The library is designed for easy integration into deep learning (DL) frameworks, whether you are implementing them from scratch or customizing existing ones.

  • Built on top of lower-level communication middleware. MPI and libfabrics transparently support many interconnects, such as Cornelis Networks*, InfiniBand*, and Ethernet.
  • Optimized for high performance on Intel® CPUs and GPUs.
  • Allows the tradeoff of compute for communication performance to drive scalability of communication patterns.
  • Enables efficient implementations of collectives that are heavily used for neural network training, including all-gather, all-reduce, and reduce-scatter.

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oneCCL is included as part of the Intel® oneAPI Base Toolkit, which is a core set of tools and libraries for developing high-performance, data-centric applications across diverse architectures.

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Features

Common APIs to Support DL Frameworks

oneCCL exposes a collective API that supports:

  • Commonly used collective operations found in deep learning and machine learning workloads
  • Interoperability with OpenCL™ APIs and SYCL* from The Khronos Group* 

 

Unique Deep Learning Optimizations

The runtime implementation enables several optimizations that are unavailable in MPI and other communication libraries, including: 

  • Asynchronous progress for compute communication overlap
  • Dedication of one or more cores to ensure optimal network use
  • Message prioritization, persistence, and out-of-order execution
  • Collectives in low-precision data types 

Documentation & Code Samples

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Documentation

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Code Samples

Learn how to access oneAPI code samples in a tool command line or IDE.

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Reference Implementations

Specifications

Processors:

  • Intel® Xeon® processors

 

GPUs:

  • Intel® Processor Graphics Gen9 and above
  • Xe architecture

 

Memory:

  • Dynamic RAM
  • Intel® Optane™ DC persistent memory

Host operating systems:

  • Linux*

Target operating systems:

  • Linux

Languages:

  • Data Parallel C++ (DPC++)
  • C and C++

Compilers:

  • GNU Compiler Collection (GCC)*
  • Distributed environments:
  • MPI (MPICH-based, Open MPI)

For more information, see the system requirements.

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A stand-alone version of this component is available.

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Runtime Version

Get Help

Your success is our success. Access these forum and GitHub* resources when you need assistance.

 

Open-Source Version

Intel oneAPI Collective Communications Library is available as an open-source library.

Visit GitHub*

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.

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