Initial commit: HyperSwap GPU Program Swapper with REST API, MCP 2.0, Real-Time Dashboard and Memory Orchestrator
This commit is contained in:
drjones
322
vram_arbitrator.py
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322
vram_arbitrator.py
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"""VRAM Arbitrator and High-Speed Switch Manager for Ollama and ComfyUI."""
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import time
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import httpx
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import psutil
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import logging
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from typing import Dict, List, Any, Optional
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from collections import deque
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try:
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import pynvml
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pynvml.nvmlInit()
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NVML_AVAILABLE = True
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except Exception as e:
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NVML_AVAILABLE = False
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logger = logging.getLogger("vram_arbitrator")
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OLLAMA_API_BASE = "http://localhost:11434"
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COMFY_API_BASE = "http://127.0.0.1:8188"
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# Circular buffer for transition events
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SWITCH_HISTORY = deque(maxlen=50)
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def get_gpu_hardware_stats() -> Dict[str, Any]:
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"""Retrieve comprehensive GPU hardware and process metrics via NVML."""
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if not NVML_AVAILABLE:
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return {"available": False, "error": "NVML not initialized"}
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try:
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handle = pynvml.nvmlDeviceGetHandleByIndex(0)
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name = pynvml.nvmlDeviceGetName(handle)
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if isinstance(name, bytes):
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name = name.decode("utf-8")
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mem_info = pynvml.nvmlDeviceGetMemoryInfo(handle)
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util_rates = pynvml.nvmlDeviceGetUtilizationRates(handle)
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temp_c = pynvml.nvmlDeviceGetTemperature(handle, pynvml.NVML_TEMPERATURE_GPU)
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try:
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power_mw = pynvml.nvmlDeviceGetPowerUsage(handle)
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power_w = round(power_mw / 1000.0, 1)
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except Exception:
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power_w = 0.0
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try:
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fan_pct = pynvml.nvmlDeviceGetFanSpeed(handle)
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except Exception:
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fan_pct = 0
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try:
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clock_graphics = pynvml.nvmlDeviceGetClockInfo(handle, pynvml.NVML_CLOCK_GRAPHICS)
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clock_mem = pynvml.nvmlDeviceGetClockInfo(handle, pynvml.NVML_CLOCK_MEM)
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except Exception:
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clock_graphics = 0
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clock_mem = 0
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# Discover processes on GPU
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proc_breakdown = {
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"ollama_bytes": 0,
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"comfyui_bytes": 0,
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"system_bytes": 0,
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"processes": []
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}
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try:
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procs = pynvml.nvmlDeviceGetComputeRunningProcesses(handle)
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graphics_procs = pynvml.nvmlDeviceGetGraphicsRunningProcesses(handle)
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all_procs = {p.pid: p.usedGpuMemory for p in procs}
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for p in graphics_procs:
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all_procs[p.pid] = max(all_procs.get(p.pid, 0), p.usedGpuMemory or 0)
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for pid, used_mem in all_procs.items():
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pname = "Unknown"
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cmdline = ""
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try:
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proc = psutil.Process(pid)
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pname = proc.name()
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cmdline = " ".join(proc.cmdline())
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except Exception:
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pass
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is_ollama = "ollama" in pname.lower() or "llama-server" in cmdline.lower()
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is_comfy = "comfy" in cmdline.lower() or "main.py" in cmdline.lower()
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if is_ollama:
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proc_breakdown["ollama_bytes"] += used_mem
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elif is_comfy:
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proc_breakdown["comfyui_bytes"] += used_mem
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else:
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proc_breakdown["system_bytes"] += used_mem
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proc_breakdown["processes"].append({
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"pid": pid,
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"name": pname,
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"cmdline": cmdline[:60],
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"vram_bytes": used_mem,
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"vram_mb": round(used_mem / (1024**2), 1),
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"is_ollama": is_ollama,
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"is_comfy": is_comfy,
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})
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except Exception as e:
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logger.error(f"Error enumerating GPU processes: {e}")
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total_vram = mem_info.total
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used_vram = mem_info.used
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free_vram = mem_info.free
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return {
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"available": True,
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"device_name": name,
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"vram_total_bytes": total_vram,
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"vram_total_gb": round(total_vram / (1024**3), 2),
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"vram_used_bytes": used_vram,
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"vram_used_gb": round(used_vram / (1024**3), 2),
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"vram_free_bytes": free_vram,
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"vram_free_gb": round(free_vram / (1024**3), 2),
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"vram_used_pct": round((used_vram / total_vram * 100) if total_vram > 0 else 0, 1),
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"gpu_util_pct": util_rates.gpu,
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"mem_util_pct": util_rates.memory,
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"temperature_c": temp_c,
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"power_w": power_w,
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"fan_pct": fan_pct,
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"clock_graphics_mhz": clock_graphics,
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"clock_mem_mhz": clock_mem,
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"breakdown": {
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"ollama_mb": round(proc_breakdown["ollama_bytes"] / (1024**2), 1),
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"ollama_gb": round(proc_breakdown["ollama_bytes"] / (1024**3), 2),
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"comfyui_mb": round(proc_breakdown["comfyui_bytes"] / (1024**2), 1),
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"comfyui_gb": round(proc_breakdown["comfyui_bytes"] / (1024**3), 2),
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"system_mb": round(proc_breakdown["system_bytes"] / (1024**2), 1),
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"system_gb": round(proc_breakdown["system_bytes"] / (1024**3), 2),
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"free_mb": round(free_vram / (1024**2), 1),
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"free_gb": round(free_vram / (1024**3), 2),
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"processes": proc_breakdown["processes"],
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}
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}
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except Exception as e:
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return {"available": False, "error": str(e)}
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async def get_ollama_live_state() -> Dict[str, Any]:
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"""Get active models, running status, and VRAM expiration from Ollama."""
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state = {
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"online": False,
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"loaded_models": [],
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"active_model_name": None,
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"active_model_vram_gb": 0.0,
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"active_context": 0,
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"expires_at": None,
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"installed_models": []
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}
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try:
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async with httpx.AsyncClient(timeout=3.0) as client:
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# Check running models (ps)
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ps_resp = await client.get(f"{OLLAMA_API_BASE}/api/ps")
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if ps_resp.status_code == 200:
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state["online"] = True
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models = ps_resp.json().get("models", [])
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state["loaded_models"] = models
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if models:
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first = models[0]
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state["active_model_name"] = first.get("name")
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vram_bytes = first.get("size_vram", first.get("size", 0))
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state["active_model_vram_gb"] = round(vram_bytes / (1024**3), 2)
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state["active_context"] = first.get("context_length", 0)
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state["expires_at"] = first.get("expires_at")
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# Check all tags
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tags_resp = await client.get(f"{OLLAMA_API_BASE}/api/tags")
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if tags_resp.status_code == 200:
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state["installed_models"] = tags_resp.json().get("models", [])
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except Exception as e:
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logger.debug(f"Ollama check error: {e}")
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return state
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async def get_comfyui_live_state() -> Dict[str, Any]:
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"""Get prompt queue, device status, and active execution from ComfyUI."""
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state = {
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"online": False,
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"executing": False,
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"queue_remaining": 0,
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"queue_running": 0,
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"current_node": None,
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"current_prompt_id": None,
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"vram_free_mb": 0,
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"vram_total_mb": 0,
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}
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try:
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async with httpx.AsyncClient(timeout=3.0) as client:
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# Check system stats
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stats_resp = await client.get(f"{COMFY_API_BASE}/system_stats")
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if stats_resp.status_code == 200:
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state["online"] = True
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data = stats_resp.json()
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devices = data.get("devices", [])
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if devices:
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dev = devices[0]
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state["vram_free_mb"] = round(dev.get("vram_free", 0) / (1024**2), 1)
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state["vram_total_mb"] = round(dev.get("vram_total", 0) / (1024**2), 1)
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# Check queue
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queue_resp = await client.get(f"{COMFY_API_BASE}/queue")
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if queue_resp.status_code == 200:
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qdata = queue_resp.json()
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running = qdata.get("queue_running", [])
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pending = qdata.get("queue_pending", [])
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state["queue_running"] = len(running)
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state["queue_remaining"] = len(pending)
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state["executing"] = len(running) > 0
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if running:
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state["current_prompt_id"] = running[0][1] if len(running[0]) > 1 else str(running[0])
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except Exception as e:
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logger.debug(f"ComfyUI check error: {e}")
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return state
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async def instant_free_ollama_vram(model_name: Optional[str] = None) -> Dict[str, Any]:
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"""Tell Ollama to instantly yield VRAM without evicting from OS page cache."""
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t0 = time.perf_counter()
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if not model_name:
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ollama_state = await get_ollama_live_state()
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model_name = ollama_state.get("active_model_name")
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if not model_name:
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return {"success": True, "message": "No active Ollama model in VRAM", "duration_ms": 0}
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try:
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async with httpx.AsyncClient(timeout=5.0) as client:
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resp = await client.post(
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f"{OLLAMA_API_BASE}/api/generate",
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json={"model": model_name, "keep_alive": 0},
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)
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duration_ms = round((time.perf_counter() - t0) * 1000, 2)
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event = {
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"timestamp": time.strftime("%H:%M:%S"),
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"event_type": "Ollama VRAM Yield",
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"source": model_name,
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"target": "VRAM 0MB (Kept in RAM)",
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"duration_ms": duration_ms,
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"cache_status": "RAM-Cached",
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}
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SWITCH_HISTORY.appendleft(event)
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return {"success": True, "model": model_name, "duration_ms": duration_ms}
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except Exception as e:
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return {"success": False, "error": str(e), "duration_ms": round((time.perf_counter() - t0) * 1000, 2)}
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async def instant_free_comfyui_vram() -> Dict[str, Any]:
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"""Tell ComfyUI to purge loaded diffusion models from VRAM."""
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t0 = time.perf_counter()
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try:
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async with httpx.AsyncClient(timeout=5.0) as client:
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resp = await client.post(
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f"{COMFY_API_BASE}/free",
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json={"unload_models": True, "free_memory": True},
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)
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duration_ms = round((time.perf_counter() - t0) * 1000, 2)
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event = {
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"timestamp": time.strftime("%H:%M:%S"),
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"event_type": "ComfyUI VRAM Purge",
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"source": "ComfyUI Pipeline",
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"target": "VRAM Free",
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"duration_ms": duration_ms,
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"cache_status": "Cleaned",
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}
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SWITCH_HISTORY.appendleft(event)
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return {"success": True, "duration_ms": duration_ms}
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except Exception as e:
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return {"success": False, "error": str(e), "duration_ms": round((time.perf_counter() - t0) * 1000, 2)}
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async def switch_ollama_model(target_model: str, keep_alive: str = "30m") -> Dict[str, Any]:
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"""High-speed hot-swap to target Ollama model, tracking swap metrics."""
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t0 = time.perf_counter()
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cur_state = await get_ollama_live_state()
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prev_model = cur_state.get("active_model_name") or "None"
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try:
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async with httpx.AsyncClient(timeout=180.0) as client:
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resp = await client.post(
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f"{OLLAMA_API_BASE}/api/generate",
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json={"model": target_model, "prompt": "Ready check", "stream": False, "keep_alive": keep_alive},
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)
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total_duration = time.perf_counter() - t0
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total_duration_ms = round(total_duration * 1000, 2)
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if resp.status_code == 200:
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data = resp.json()
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load_dur_ms = round(data.get("load_duration", 0) / 1e6, 2)
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eval_dur_ms = round(data.get("eval_duration", 0) / 1e6, 2)
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eval_count = data.get("eval_count", 0)
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tokens_per_sec = round((eval_count / (eval_dur_ms / 1000)) if eval_dur_ms > 0 else 0, 1)
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# Check if it was a RAM cache hit (load duration < 1500ms for large model indicates RAM hit)
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is_ram_hit = load_dur_ms < 2500
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event = {
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"timestamp": time.strftime("%H:%M:%S"),
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"event_type": "LLM Model Switch",
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"source": prev_model,
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"target": target_model,
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"duration_ms": total_duration_ms,
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"load_duration_ms": load_dur_ms,
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"tokens_per_sec": tokens_per_sec,
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"cache_status": "RAM Cache Hit ⚡" if is_ram_hit else "Cold Disk Load 💾",
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}
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SWITCH_HISTORY.appendleft(event)
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return {
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"success": True,
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"prev_model": prev_model,
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"target_model": target_model,
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"total_duration_ms": total_duration_ms,
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"load_duration_ms": load_dur_ms,
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"tokens_per_sec": tokens_per_sec,
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"is_ram_hit": is_ram_hit,
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"response": data.get("response", ""),
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}
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else:
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return {"success": False, "error": f"HTTP {resp.status_code}: {resp.text}", "duration_ms": total_duration_ms}
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except Exception as e:
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return {"success": False, "error": str(e), "duration_ms": round((time.perf_counter() - t0) * 1000, 2)}
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def get_switch_history() -> List[Dict[str, Any]]:
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return list(SWITCH_HISTORY)
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