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Workspace services slice — cgroup partitioning for multi-developer environments

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@@ -7,19 +7,19 @@ category: architecture
type: topic
status: active
bcsc_class: public-disclosure-safe
last_edited: 2026-05-18
last_edited: 2026-05-25
editor: pointsav-engineering
cites: []
paired_with: foundry-services-slice-model.es.md
---

The development workspace runs as a multi-tenant environment. Production services (local-slm, local-doorman, local-content, local-fs, local-proofreader) share the same Linux box as interactive AI-coding sessions (Claude Code, Gemini CLI) and human shells. Without resource isolation, a heavy `cargo build` in one operator's session can starve the OLMo SLM that another operator is relying on for inference.
The PointSav development environment runs production services and interactive engineering sessions on the same Linux host. Platform services (the local SLM, Doorman, content graph, ledger writer, and proofreader) share CPU and memory with multi-operator build sessions. Without resource isolation, a heavy `cargo build` in one operator's session can starve the inference service that another operator is relying on.

An initial hardening pass introduced `foundry-services.slice` — a systemd cgroup partition with `CPUWeight=200` and `MemoryHigh=11G` that holds every `local-*.service`. Default systemd user slices (`user-1001.slice`, `user-1002.slice`) sit at `CPUWeight=100`, so under CPU contention the service group receives 2× the scheduler weight relative to a single interactive shell. Memory ceilings prevent any one service from pinning more than approximately 11 GiB on a 16 GiB VM; with `OOMScoreAdjust` ordering (sshd −1000, local-fs −500, local-doorman −300, local-slm +500), the kernel's last-resort kill prefers cheap-to-restart services over the WORM ledger writer or the operator's SSH connection.

This is not orchestration in the Kubernetes sense — there is no scheduler, no replica controller, no service mesh. systemd is enough. The pattern scales to roughly a dozen services on a single GCE VM, the compact single-node configuration that characterises a minimal sovereign deployment. Beyond that scale, the architecture changes — but the cgroup discipline carries forward.

Where this lives on disk: `/etc/systemd/system/foundry-services.slice`, plus `Slice=foundry-services.slice` drop-ins under `/etc/systemd/system/local-*.service.d/slice.conf`. The version-controlled source mirrors live under `infrastructure/`.
Where this lives on disk: `/etc/systemd/system/services.slice`, plus `Slice=` drop-ins under `/etc/systemd/system/local-*.service.d/slice.conf`. The version-controlled source mirrors live under the monorepo's `infrastructure/` directory.

## See also
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