NCCL Insights | Sumble

What is NCCL?

NVIDIA Collective Communications Library (NCCL) is a library for multi-GPU and multi-node collective communication primitives. It provides optimized routines for data transfer and synchronization across multiple GPUs, enabling faster training of deep learning models and other parallel applications. It is commonly used in distributed deep learning frameworks like TensorFlow, PyTorch, and MXNet to accelerate model training.

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What other technologies are related to NCCL?

NCCL Competitor Technologies

OneCCL

OneCCL is a communication library from Intel designed for collective communication, serving a similar purpose as NCCL but for different hardware.

mentioned alongside NCCL in 85% (55) of relevant job posts

NVSHMEM

NVSHMEM provides a shared memory programming model across multiple GPUs, presenting an alternative to NCCL for certain inter-GPU communication patterns.

mentioned alongside NCCL in 79% (56) of relevant job posts

MPI

MPI (Message Passing Interface) is a standard for inter-process communication, offering collective communication operations that compete with NCCL, although NCCL focuses specifically on GPU collectives.

mentioned alongside NCCL in 7% (511) of relevant job posts

ROCm

ROCm is AMD's platform for GPU computing, and while not directly a communication library, it represents a competing ecosystem to CUDA where NCCL operates. Alternatives to NCCL may exist within ROCm.

mentioned alongside NCCL in 5% (52) of relevant job posts

NCCL Complementary Technologies

UCX

UCX is a communication framework that can be used as a backend for NCCL, providing transport optimizations.

mentioned alongside NCCL in 44% (136) of relevant job posts

ibverbs

ibverbs is a low-level interface for RDMA, often used as a backend for NCCL to enable high-speed communication over InfiniBand.

mentioned alongside NCCL in 80% (51) of relevant job posts

RDMA

RDMA (Remote Direct Memory Access) is a networking technology that allows direct memory access between computers without involving the operating system, and NCCL leverages RDMA for high-speed communication.

mentioned alongside NCCL in 12% (321) of relevant job posts