NCCL / RCCL collectives
Collective-communication library that makes multi-GPU training work
Layers as clusters, money as arcs, brand marks on the biggest stars
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Full file coming soon. NCCL / RCCL collectives's links, deals and figures below are what the graph holds today.Not collected yet: 360, Money, Investors, Market share, People and hiring, Legal, News and events, Earnings calls. Anthropic is the first complete company file (people, investors, legal, hiring, birth to now); other companies follow one at a time. Open Anthropic's file
Overview
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L2 Chips · Standard / protocol · chokepoint
NCCL / RCCL collectives
Collective-communication library that makes multi-GPU training work
- Links
- 3
- Deals from filings
- 0
- Exposed if it fails
- 1
- 39 within 2 steps
- It depends on
- 2
- 2 within 2 steps
No company file yet: revenue, customers and other figures appear here once they are taken from its filings.
What it is
NCCL is NVIDIA's collective-communications library (all-reduce, all-gather) that every large training run depends on to synchronize gradients across thousands of GPUs; AMD's RCCL clones its API. It is an underappreciated part of the CUDA moat because distributed-training performance and fault tolerance hinge on it, and it is tightly co-designed with NVLink and InfiniBand.
Key facts
from its map entry- Ops
- all-reduce, all-gather
- AMD equivalent
- RCCL
Pick a link to move the graph there: · ·
Connections3 links
Pulled 28 Oct 2026 · AI Systems Map links
Its suppliers
2Who depends on it
1Compare two: what NCCL / RCCL collectives shares with another entity
Pick a second entity to see their direct links, the suppliers, backers, rivals and regulators they share, and the deals with the same parties. The graph lights the same set.
Data sources1 source
| Source | Feeds | Data dated | Pulled | Pulled again | Status |
|---|---|---|---|---|---|
| AI Systems Map links3 links; built July 2026, deals re-checked against filings 27 to 28 Oct 2026 | Connections | · | 28 Oct 2026 | when the map is reviewed | hand-built; deals checked against filings |
Times are New York time. Free sources are pulled on the schedule shown by the pipeline runner (data/corpus/run_pipelines.py), which logs every run; paid sources run only with the owner's yes; filings and newsroom pages are re-read when a new document is filed.
Links come from the AI Systems Map ontology. Deals carry the filing's own wording and a quote, checked against the document; latest source 2026-10-26. Not investment advice.