Home Projects nccl
nccl

nccl

by NVIDIA · GitHub

Optimized primitives for collective multi-GPU communication

# communications# cpp# cuda# deep-learning
View on GitHub
⭐ Stars
4.9k
🍴 Forks
1.3k
🔥 Trending
+14 this week
📜 License
License not specified
📅 Created
2015
🔄 Last commit
4 days ago
🏷️ Category
communications
💻 Language
You maintain this project?

Claim its page: indexed whatever its rank, translated into six languages, and enriched with what you write yourself.

Claim this page →
nccl — GitHub preview card
📈 Star history
4.9k4.8k
2026-07-042026-07-22
📄 About

Optimized primitives for collective multi-GPU communication

Frequently asked questions

What is nccl?

Optimized primitives for collective multi-GPU communication

Is nccl open source?

nccl is an open-source project.

Is nccl free?

Yes. nccl is free and open source — you can use, modify and self-host it.

🏅 Maintainer of this project?
OpenSourceAI badge — nccl

Add this live badge to your README — your GitHub stars and directory rank, refreshed daily.

[![OpenSourceAI](https://opensourceai.tech/badge.php?tool=nvidia-nccl)](https://opensourceai.tech/project/nvidia-nccl.html)
More badge options →
🧬 Related projects🧬 View the DNA map →