hyperpod-performance-debugger

A read-only troubleshooting guide for Amazon SageMaker HyperPod, a service for running large machine-learning jobs across many computers, focused on uneven network speed and slow shared-file storage.

In plain words
What is it for?
Use it to investigate uneven NCCL communication between nodes or slow data loading and checkpoint saves involving FSx storage.
Why use it?
It helps identify whether inconsistent training speed comes from host, GPU-network, or filesystem signals and directs unrelated problems to more specific guides.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/awslabs/agent-plugins/hyperpod-performance-debugger
Any agent
npx skills add awslabs/agent-plugins --skill hyperpod-performance-debugger
Clone the repo
git clone --depth 1 https://github.com/awslabs/agent-plugins

Made for: Claude Code, Codex.

Per session 133 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,618 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00133 $0.03618
Opus 5 $0.00067 $0.01809
Sonnet 5 $0.00027 $0.00724
Haiku 4.5 $0.00013 $0.00362

Measured 2d ago against content hash 5a32c6f8bc8d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

hyperpod-performance-debugger scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/perf-snapshot.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/sagemaker-ai/skills/hyperpod-performance-debugger/SKILL.md · 186 lines

How it starts

The opening of the file, as written. The whole thing — 186 lines — stays where its author put it; the contents beside it link to each section on GitHub.

HyperPod Performance Debugger

  1. Uneven NCCL performance across nodes — workload faster on some node sets than others, pairwise bandwidth variance, suspected straggler.
  2. Poor filesystem performance — training stalled on data loading, checkpoint save/load dominating step time, FSx throughput saturated.

Scope and delegation

Route findings outside the two in-scope scenarios to the owner skill below.

Concern observed Route to
GPU hardware fault, ECC, NVLink, Xid, DCGM diagnostics, drain/replace hyperpod-node-debugger (§ F Hardware/Auto-Repair, § G GPU)
Cannot allocate memory at os.fork(), root volume exhausted hyperpod-node-debugger (§ I Resource Exhaustion)
NCCL timeouts, hangs, AllReduce stalls, EFA TCP fallback, RDMA memlock hyperpod-nccl
EFA / NCCL / CUDA / NVIDIA driver version drift across nodes hyperpod-version-checker
EFA self-referencing security-group rule missing — single node hyperpod-node-debugger § A (EFA / Security Group)
EFA self-referencing security-group rule missing — cluster-wide hyperpod-cluster-debugger § A (EFA Health Checks)
Slurm node state changes (drain / resume / reboot) hyperpod-slurm-debugger
Diagnostic bundle for AWS Support hyperpod-issue-report
Shell access on a node hyperpod-ssm

Operating policy

  • Read-only. Print commands the customer runs; do not execute commands that modify state.
  • Container vs host version comparisons go through hyperpod-version-checker.
  • Xid lines, ECC counts, NVLink lane state, and thermal readings get surfaced; the catalog and verdict live in hyperpod-node-debugger § G.

Read the full file on GitHub · 186 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 186 lines · 133 tokens per session scan A 5a32c6f8bc8d

Subscribe to this mod's changes

hyperpod-performance-debugger is a skill published in the GitHub repository awslabs/agent-plugins (876 stars, last pushed 5d ago), licensed Apache-2.0. It adds 133 tokens to every session and 3,618 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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