Spaces:
Sleeping
Sleeping
File size: 6,868 Bytes
234574a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 | """Zero-overhead AMD GPU memory monitor via PyRSMI - fixes BUG-003 / IMPROVEMENT-004.
Replaces blocking subprocess.run(["rocm-smi"]) with native PyRSMI C bindings.
No subprocess, no shell, no event loop blocking. <1ms overhead.
Install: pip install pyrsmi
Docs: https://github.com/ROCm/pyrsmi
"""
import asyncio
import logging
from typing import Optional
logger = logging.getLogger(__name__)
class VRAMMonitor:
"""
Zero-overhead AMD GPU memory monitor using PyRSMI native C bindings.
MI300X specs:
- 192GB HBM3 total
- PyRSMI reads via ROCm SMI kernel driver (/dev/mem mapped)
- Native bindings return bytes directly, no shell parsing
Usage:
monitor = VRAMMonitor()
monitor.start() # Start background monitoring
pressure = monitor.get_pressure() # 0.0-1.0
mode = monitor.get_eviction_mode() # "relaxed", "normal", "pressure", "critical", "emergency"
used_gb = monitor.get_used_gb()
available_gb = monitor.get_available_gb()
monitor.stop()
"""
VRAM_CHECK_INTERVAL = 2.0 # seconds between checks
def __init__(self, device_id: int = 0):
self._device_id = device_id
self._initialized = False
self._pyrsml = None
self._current_pressure = 0.0
self._monitor_task: Optional[asyncio.Task] = None
self._init()
def _init(self) -> None:
"""Initialize PyRSMI (fails gracefully if unavailable)."""
try:
from pyrsmi import rocml
rocml.smi_initialize()
self._pyrsml = rocml
self._initialized = True
logger.info(f"PyRSMI initialized for device {self._device_id}")
except ImportError:
logger.warning(
"pyrsmi not available. Install with: pip install pyrsmi. "
"Falling back to /sys/class/drm (read-only, ~5ms overhead)."
)
except Exception as e:
logger.error(f"PyRSMI initialization failed: {e}")
async def start(self) -> None:
"""Start background VRAM monitoring loop."""
if self._monitor_task is not None:
return
self._monitor_task = asyncio.create_task(self._monitor_loop())
async def stop(self) -> None:
"""Stop background monitoring."""
if self._monitor_task:
self._monitor_task.cancel()
try:
await self._monitor_task
except asyncio.CancelledError:
pass
self._monitor_task = None
async def _monitor_loop(self) -> None:
"""Background loop: updates pressure every VRAM_CHECK_INTERVAL."""
while True:
try:
self._current_pressure = self.get_pressure()
await asyncio.sleep(self.VRAM_CHECK_INTERVAL)
except asyncio.CancelledError:
break
except Exception as e:
logger.error(f"VRAM monitor loop error: {e}")
def get_used_bytes(self) -> int:
"""Get used VRAM in bytes."""
if self._initialized and self._pyrsml:
try:
return self._pyrsml.smi_get_device_memory_used(self._device_id)
except Exception as e:
logger.warning(f"PyRSMI get_used_bytes failed: {e}")
return self._fallback_used_bytes()
def get_total_bytes(self) -> int:
"""Get total VRAM in bytes."""
if self._initialized and self._pyrsml:
try:
return self._pyrsml.smi_get_device_memory_total(self._device_id)
except Exception as e:
logger.warning(f"PyRSMI get_total_bytes failed: {e}")
return self._fallback_total_bytes()
def get_available_bytes(self) -> int:
"""Get available VRAM in bytes."""
return self.get_total_bytes() - self.get_used_bytes()
def get_used_gb(self) -> float:
"""Get used VRAM in gigabytes."""
return self.get_used_bytes() / (1024 ** 3)
def get_total_gb(self) -> float:
"""Get total VRAM in gigabytes."""
return self.get_total_bytes() / (1024 ** 3)
def get_available_gb(self) -> float:
"""Get available VRAM in gigabytes."""
return self.get_available_bytes() / (1024 ** 3)
def get_pressure(self) -> float:
"""
Returns VRAM utilization 0.0–1.0. <1ms overhead.
Returns:
Pressure ratio (0.0 = free, 1.0 = saturated)
"""
total = self.get_total_bytes()
if total == 0:
return 0.0
return self.get_used_bytes() / total
def get_eviction_mode(self) -> str:
"""
Returns eviction mode based on VRAM pressure.
Returns:
One of: "relaxed", "normal", "pressure", "critical", "emergency"
"""
p = self.get_pressure()
if p < 0.70: return "relaxed"
if p < 0.85: return "normal"
if p < 0.92: return "pressure"
if p < 0.96: return "critical"
return "emergency"
@staticmethod
def _fallback_used_bytes() -> int:
"""
Fallback: read from Linux DRM sysfs (read-only, ~5ms overhead).
Works on any Linux system with AMD GPU.
"""
try:
with open("/sys/class/drm/card0/device/mem_info_vram_used", "r") as f:
return int(f.read().strip())
except Exception:
return 0
@staticmethod
def _fallback_total_bytes() -> int:
"""
Fallback: read from Linux DRM sysfs.
Default to 192GB MI300X if unable to read.
"""
try:
with open("/sys/class/drm/card0/device/mem_info_vram_total", "r") as f:
return int(f.read().strip())
except Exception:
# MI300X has 192GB HBM3
return 192 * (1024 ** 3)
def __del__(self):
"""Cleanup PyRSMI on destruction."""
if self._initialized and self._pyrsml:
try:
self._pyrsml.smi_shutdown()
except Exception:
pass
# Module-level singleton
_monitor: Optional[VRAMMonitor] = None
def get_monitor() -> VRAMMonitor:
"""Get or create module-level VRAMMonitor singleton."""
global _monitor
if _monitor is None:
_monitor = VRAMMonitor()
return _monitor
def get_vram_pressure() -> float:
"""Quick VRAM pressure check."""
return get_monitor().get_pressure()
def get_vram_used_gb() -> float:
"""Quick VRAM used GB."""
return get_monitor().get_used_gb()
def get_vram_available_gb() -> float:
"""Quick VRAM available GB."""
return get_monitor().get_available_gb()
def get_eviction_mode() -> str:
"""Quick eviction mode check."""
return get_monitor().get_eviction_mode() |