c891c6b23a
- multiprocessing.set_start_method('spawn') pour éviter la corruption
du contexte CUDA dans les processus forkés
- to_gpu() et xp_*_filter() attrapent les erreurs CUDA et tombent
sur CPU au lieu de crasher
- _gpu_available() vérifie que le GPU est utilisable avant chaque opération
- gpu_cleanup() attrape les exceptions au cas où le GPU serait indisponible
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
118 lines
3.5 KiB
Python
118 lines
3.5 KiB
Python
"""GPU acceleration helpers for LiDAR pipeline.
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Provides CuPy/numpy abstraction layer. If CuPy is available and a CUDA GPU
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is detected, array operations are accelerated on the GPU. Otherwise, all
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operations fall back to numpy/scipy on CPU.
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GPU errors (e.g. in forked subprocesses) are caught gracefully and
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cause an automatic fallback to CPU for the current operation.
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"""
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import logging
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import numpy as np
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from scipy import ndimage
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logger = logging.getLogger("lidar")
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# GPU detection - must happen at import time
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HAS_GPU = False
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_gpu_name = None
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_gpu_mem_gb = 0
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_xp = np # Default: CPU
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_cp = None # cupy module (or None)
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_cp_ndimage = None # cupyx.scipy.ndimage (or None)
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try:
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import cupy as _cupy
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import cupyx.scipy.ndimage as _cupy_ndimage
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_gpu_info = _cupy.cuda.runtime.getDeviceProperties(0)
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_gpu_name = _gpu_info['name'].decode() if isinstance(_gpu_info['name'], bytes) else str(_gpu_info['name'])
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_gpu_mem_gb = _gpu_info['totalGlobalMem'] // (1024 ** 3)
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HAS_GPU = True
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_xp = _cupy
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_cp = _cupy
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_cp_ndimage = _cupy_ndimage
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except (ImportError, Exception):
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pass
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def _gpu_available():
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"""Check if GPU is usable right now (may fail in forked subprocesses)."""
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if not HAS_GPU:
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return False
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try:
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_cp.cuda.runtime.getDevice()
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return True
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except Exception:
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return False
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def log_gpu_status():
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"""Log GPU detection result. Called after logging is configured."""
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if _gpu_available():
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logger.info(f"GPU détectée: {_gpu_name} ({_gpu_mem_gb} Go VRAM)")
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else:
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logger.info("Pas de GPU — mode CPU uniquement")
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def to_gpu(arr):
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"""Send array to GPU if available, otherwise return as float64 numpy.
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Falls back to CPU if GPU is unavailable (e.g. in forked subprocess).
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"""
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if _gpu_available():
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try:
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return _cp.asarray(arr.astype(np.float64))
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except Exception:
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pass # Fall back to CPU
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return arr.astype(np.float64)
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def to_cpu(arr):
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"""Bring array back to CPU (numpy). No-op if already on CPU."""
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if _cp is not None and isinstance(arr, _cp.ndarray):
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try:
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return _cp.asnumpy(arr)
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except Exception:
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pass # Already on CPU or GPU error
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return arr
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def xp_gaussian_filter(arr, sigma):
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"""Gaussian filter — uses GPU if array is on GPU, CPU otherwise."""
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if _cp is not None and isinstance(arr, _cp.ndarray):
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try:
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return _cp_ndimage.gaussian_filter(arr, sigma)
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except Exception:
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arr = to_cpu(arr)
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return ndimage.gaussian_filter(arr, sigma)
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def xp_uniform_filter(arr, size):
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"""Uniform filter — uses GPU if array is on GPU, CPU otherwise."""
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if _cp is not None and isinstance(arr, _cp.ndarray):
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try:
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return _cp_ndimage.uniform_filter(arr, size)
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except Exception:
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arr = to_cpu(arr)
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return ndimage.uniform_filter(arr, size)
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def xp_minimum_filter(arr, footprint=None, size=None):
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"""Minimum filter — uses GPU if array is on GPU, CPU otherwise."""
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if _cp is not None and isinstance(arr, _cp.ndarray):
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try:
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return _cp_ndimage.minimum_filter(arr, footprint=footprint, size=size)
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except Exception:
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arr = to_cpu(arr)
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return ndimage.minimum_filter(arr, footprint=footprint, size=size)
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def gpu_cleanup():
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"""Free GPU memory. Call between visualizations to prevent OOM."""
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if _cp is not None:
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try:
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_cp.get_default_memory_pool().free_all_blocks()
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except Exception:
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pass |