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BitNet Swarm Runner Baseline

First evidence of the EM CI Routed Rust lane on EffortlessMetrics/bitnet-rs-swarm.

Workflow

.github/workflows/em-ci-routed-rust.yml routes the small BitNet Rust lane:

Route BitNet Rust Small  (ubuntu-latest, gh api orgs/.../actions/runners)
  ├─ target=cx53    → BitNet Rust Small on CX53          (self-hosted, docker em-ci-rust:1.95)
  ├─ target=cx43    → BitNet Rust Small on CX43          (self-hosted, docker em-ci-rust:1.95)
  └─ target=github  → BitNet Rust Small on GitHub Hosted (ubuntu-latest fallback)

BitNet Rust Small Result  (ubuntu-latest, normalized gate)

The router selects CX53 when an org runner with labels em-ci, cx53, rust-small, trusted-pr is online and busy=false. If no CX53 runner is idle, it selects CX43 when an org runner with labels em-ci, cx43, rust-small, trusted-pr is online and busy=false. On token missing, API failure, or parse failure the router fails open to target=github and emits router_error=true.

First-run evidence (2026-05-17/18)

PR-path run (PR #1, attempt 2)

  • Run: 26006239077
  • Route: success, 5s, router_target=cx53, router_reason=cx53_idle
  • CX53: success, 6m25s, runner em-ci-hel2-cx53-rust-01 (cold sccache)
  • GitHub Hosted: skipped
  • Result: success

Workflow-dispatch on main

  • Run: 26009235657
  • Route: success, 5s, router_target=cx53, router_reason=cx53_idle
  • CX53: success, 3m14s, runner em-ci-hel2-cx53-rust-01 (warm sccache)
  • GitHub Hosted: skipped
  • Result: success

Warm sccache cut CX53 lane runtime from 6m25s to 3m14s.

Self-hosted runner labels

CX53: em-ci, cx53, rust-small, trusted-pr on group em-ci-small. CX43: em-ci, cx43, rust-small, trusted-pr on group em-ci-small. Container image: em-ci-rust:1.95. Persistent mounts: /mnt/ci-cache/{cargo-home,sccache}, ephemeral /mnt/ci-scratch/{tmp,target}/<run>-<attempt> cleaned in the same job.

Branch protection (planned, not yet enabled)

When enabled, branch protection on main should require only BitNet Rust Small Result. Do not require the conditional implementation lanes (Route BitNet Rust Small, BitNet Rust Small on CX53, BitNet Rust Small on CX43, BitNet Rust Small on GitHub Hosted) — they are not always present in a single run.

What is intentionally not yet wired

  • Model-cache lane (no HF_TOKEN, no /mnt/model-cache mount).
  • CX33 BitNet backfill runner.
  • Branch protection (pending tiny-PR validation of the same-repo PR path).
  • Public EffortlessMetrics/BitNet-rs cutover (queue drain pending).