The NVIDIA Collective Communications Library (NCCL) implements multi-GPU and multinode communication primitives optimized for NVIDIA GPUs and networking. NCCL is a central piece of software for multi-GPU deep learning training. It handles any kind of inter-GPU communication, be it over PCI, NVLink, or networking. It uses advanced topology detection, optimized communication graphs…

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For the past few months, the NVIDIA Collective Communications Library (NCCL) developers have been working hard on a set of new library features and bug fixes. In this post, we discuss the details of the NCCL 2.22 release and the pain points addressed. NVIDIA Magnum IO NCCL is a library designed to optimize inter-GPU and multi-node communication, crucial for efficient parallel computing…

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