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97 lines
3.7 KiB
Markdown
97 lines
3.7 KiB
Markdown
# gpu-turnstile
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GPU arbitration proxy for Ollama + ComfyUI. One consumer GPU is shared by an
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LLM server (Ollama) and an image generator (ComfyUI); gpu-turnstile sits in
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front of both and guarantees the GPU is always in exactly one of three states:
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`idle`, `llm` (N ≥ 1 Ollama requests in flight), or `image` (exactly one
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ComfyUI job, Ollama models unloaded). See [SPEC.md](SPEC.md) for the full
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design.
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gpu-turnstile listens on the ports the services normally use; the actual
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services run one port higher (Ollama on 11435, ComfyUI on 8189).
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```
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LiteLLM / Open WebUI ──► :11434 ─┐ ┌─► Ollama :11435
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├── gpu-turnstile (1 lock) ──┤
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Open WebUI / n8n ────► :8188 ───┘ └─► ComfyUI :8189
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```
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- LLM endpoints (`/api/generate`, `/api/chat`, `/api/embed`, `/v1/*`) take the
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LLM lock: concurrent requests allowed, but blocked while an image job is
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active or waiting (image priority).
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- `POST /prompt` on the ComfyUI listener takes the image lock: new LLM
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requests block, in-flight LLMs drain, Ollama models are unloaded, the prompt
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is forwarded, and the lock is held until the job finishes and ComfyUI frees
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its VRAM.
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- Everything else (including websockets and all streaming) passes through
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transparently and unbuffered.
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## Configuration
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All configuration is via environment variables; invalid values fail at
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startup.
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| Var | Default | Meaning |
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|---|---|---|
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| `LISTEN_OLLAMA` | `:11434` | Ollama-facing listener |
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| `LISTEN_COMFY` | `:8188` | ComfyUI-facing listener |
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| `OLLAMA_URL` | `http://127.0.0.1:11435` | Ollama upstream |
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| `COMFY_URL` | `http://127.0.0.1:8189` | ComfyUI upstream |
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| `UNLOAD_TIMEOUT` | `60s` | Wait for Ollama to unload before an image job |
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| `JOB_TIMEOUT` | `15m` | Wait for a ComfyUI job to finish |
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| `LLM_WAIT_TIMEOUT` | `10m` | Max lock wait for an LLM request before 503 |
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| `WARM_MODEL` | _(empty)_ | Model to reload after an image job (off by default) |
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| `LOG_LEVEL` | `info` | `debug` logs every lock transition |
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| `LOG_FORMAT` | `text` | `json` for structured JSON logs |
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## Observability
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- `GET /healthz` (both listeners): `{"state":"idle|llm|image","llm_inflight":N,"image_pending":B}`
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- `GET /metrics` (Ollama listener): Prometheus text format — `gpu_turnstile_state`,
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`gpu_turnstile_llm_inflight`, `gpu_turnstile_image_pending`,
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`gpu_turnstile_image_jobs_total`, `gpu_turnstile_lock_wait_seconds`
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(histogram, `kind="llm|image"`), `gpu_turnstile_unload_seconds`.
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## Build and run
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```sh
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go build ./cmd/gpu-turnstile
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./gpu-turnstile
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```
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```sh
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docker build -t gpu-turnstile .
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docker run --rm -p 11434:11434 -p 8188:8188 \
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-e OLLAMA_URL=http://<workstation-ip>:11435 \
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-e COMFY_URL=http://<workstation-ip>:8189 \
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gpu-turnstile
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```
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Releases are built by Gitea Actions (`.gitea/workflows/ci.yml`): every push
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runs `go vet` and `go test -race`, and pushing a semantic-version tag
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`vX.Y.Z` builds and publishes
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`git.rambossek.at/<owner>/gpu-turnstile:vX.Y.Z` (and updates `:latest`).
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No images are built from branches.
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The registry login needs two repository secrets (Settings → Actions →
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Secrets): `REGISTRY_USERNAME` and `REGISTRY_TOKEN` — an access token with
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`write:package` scope. The automatic `GITEA_TOKEN` cannot push packages.
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## Development
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```sh
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go vet ./...
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go test -race ./...
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```
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Stdlib only, Go 1.23+. Layout:
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```
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cmd/gpu-turnstile/main.go wiring, config, listeners
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internal/lock/ two-mode lock (LLM readers / image writer, FIFO)
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internal/ollama/ ps / unload / warm client
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internal/comfy/ history poll / free client
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internal/proxy/ handlers for both listeners
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internal/metrics/ Prometheus exposition, no dependencies
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```
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