Agent Substrate claims 500 resumes/sec, but one 24-vCPU node delivers 37 — a measured deep dive
ghumare64 · x · 2026-11-13
ghumare64 released a free manual on Agent Substrate v1.0.0, a Kubernetes runtime for stateful agent actors, after the official site claimed 500+ resumes/sec while his 24-vCPU node measured only 37. All numbers come from recorded runs (24 recordings included):
- Idle actors are never suspended: one sat RUNNING for 900s; idle policy must be built yourself.
- Resume cost scales with resident memory: 0.22s at 0 MiB vs 2.16s at 1,000 MiB.
- Hidden concurrency ceiling: 600/600 concurrent resumes succeeded (7.3s median) but throughput stayed 37/sec; extra API server/router replicas didn't help — 100 parallel gVisor restores each slow from 0.27s to 2.7s.
- Additional findings on API server replicas exhausting the 100-connection limit.
A practical reference for teams running large-scale agent orchestration on Kubernetes.
More from coding & agent
- Claude Code calls the human user "Claude", sparking identity-confusion laughs — wavefnx · 2026-11-13
- Fable 5.2 + Tripo + Blender MCP conjures a skeleton-spawning necromancer from one prompt — sidahuj · 2026-11-13
- One prompt, 2,200 lines: ERNIE 5.5 Flash Preview builds animated sneaker site in under 5 min — Div_pradeep · 2026-11-13
- Reviewer: open-source multi-agent paper reviewer built on Codex/Claude Code — JeremyNguyenPhD · 2026-11-13
- 5 free AI agent courses to start this weekend, from Hugging Face to Andrew Ng — JafarNajafov · 2026-11-13
- threepointone: AI is driving tech-stack switching costs to near zero — threepointone · 2026-11-13