---
title: "NCCL Events Summary (collective + P2P + RAS)"
method: GET
path: "/api/nccl/summary"
tags: ["NCCL"]
---

# NCCL Events Summary (collective + P2P + RAS)

`GET /api/nccl/summary`

## Request

- Base URL: `https://api.fiber.ac` (the document declares no server; this is the origin it was published from)
- URL: `https://api.fiber.ac/api/nccl/summary`
- Auth: none declared

Aggregate NCCL Inspector events over the last N minutes.

Returns:
  • Window-level percentiles — mean/p50/p05 bandwidth, p95/p99 duration
  • `by_type` block — collective (NCCL ≤ 2.29) + P2P sendrecv (NCCL 2.30+) with separate low-bandwidth thresholds (50 GB/s vs 5 GB/s)
  • `ras` block — NCCL RAS subsystem (NCCL 2.24+) totals: critical / warning / max_hang_seconds. RAS events are ingested via POST /api/nccl/ras and automatically reflected here.
  • `ras.diag` block — NCCL 2.31.2 `ncclras -D` diagnostics (24 h lookback, latest result per check × node): checks / nodes / ok / warning / failed / last_run + `failed_checks[]` with the FAIL detail line.

## Query parameters

- `minutes` integer

## Response `200`

Window aggregates with bandwidth/duration percentiles, by_type breakdown, RAS rollup

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/fiber-ac/apis/fiber-api.md) · [All operations](https://skmtc.dev/fiber-ac/apis/fiber-api/llms.txt) · [OpenAPI document](https://skmtc.dev/fiber-ac/apis/fiber-api/revisions/58267250d793?raw)