ComfyUI ComfyUI 0.42.0 (commit cdf272f), PyTorch 2.14.1 CPU: our test log

# Clone repository
git clone --depth 1 https://github.com/comfyanonymous/ComfyUI.git

# Install with uv (cold, no cache)
uv pip install torch torchvision torchaudio (CPU wheels) && uv pip install -r requirements.txt

# Task command (start server, probe API)
python main.py --cpu --listen 127.0.0.1 --port 8189 (driven by tasks3/comfy_task.py)

{
 "ready_s": 30.1,
 "system_stats": {
  "comfyui_version": "0.42.0",
  "python_version": "3.12.15 (main, Oct 21 2026, 17:47:06) [Clang 23.1.3 ]",
  "pytorch_version": "2.14.1+cpu",
  "ram_total": 16779640832
 },
 "devices": [
  [
   "cpu",
   "cpu"
  ]
 ],
 "object_info_s": 0.31,
 "node_types": 1014,
 "sample_nodes": [
  "KSampler",
  "CheckpointLoaderSimple",
  "CLIPTextEncode",
  "SaveImage",
  "VAEDecode"
 ],
 "checkpoints_listed": []
}

import subprocess, time, json, urllib.request, sys, os, signal
PY = "/workspace/tests2/work/py/comfyui/bin/python"
cwd = "/workspace/tests2/work/comfy/ComfyUI"
t0 = time.time()
p = subprocess.Popen([PY, "main.py", "--cpu", "--listen", "127.0.0.1", "--port", "8189", "--disable-auto-launch"], cwd=cwd, stdout=open("/workspace/tests2/logs/comfy-server.log", "w"), stderr=subprocess.STDOUT)
def get(path):
    return json.load(urllib.request.urlopen("http://127.0.0.1:8189" + path, timeout=30))
res = {}
try:
    for i in range(240):
        try:
            st = get("/system_stats"); res["ready_s"] = round(time.time() - t0, 1); break
        except Exception:
            time.sleep(1)
    else:
        raise SystemExit("server never became ready")
    res["system_stats"] = {k: st["system"].get(k) for k in ("comfyui_version", "python_version", "pytorch_version", "ram_total")}
    res["devices"] = [(d["name"], d["type"]) for d in st["devices"]]
    t1 = time.time(); oi = get("/object_info"); res["object_info_s"] = round(time.time() - t1, 2)
    res["node_types"] = len(oi)
    res["sample_nodes"] = [n for n in ("KSampler", "CheckpointLoaderSimple", "CLIPTextEncode", "SaveImage", "VAEDecode") if n in oi]
    res["checkpoints_listed"] = oi["CheckpointLoaderSimple"]["input"]["required"]["ckpt_name"][0]
finally:
    p.send_signal(signal.SIGINT)
    try: p.wait(20)
    except Exception: p.kill()
print("RESULT_JSON " + json.dumps(res))

git clone https://github.com/comfyanonymous/ComfyUI && cd ComfyUI
uv venv -p 3.12 .venv && VIRTUAL_ENV=.venv uv pip install torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/cpu && VIRTUAL_ENV=.venv uv pip install -r requirements.txt
.venv/bin/python main.py --cpu --port 8189
curl http://127.0.0.1:8189/system_stats