47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
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import gc
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import time
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from typing import Mapping, Optional
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class GcLogger:
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"""Context manager to log GC stats and overall time."""
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def __enter__(self) -> 'GcLogger':
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self.gc_start_time: Optional[float] = None
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self.gc_time = 0.0
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self.gc_calls = 0
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self.gc_collected = 0
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self.gc_uncollectable = 0
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gc.callbacks.append(self.gc_callback)
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self.start_time = time.time()
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return self
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def gc_callback(self, phase: str, info: Mapping[str, int]) -> None:
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if phase == 'start':
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assert self.gc_start_time is None, "Start phase out of sequence"
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self.gc_start_time = time.time()
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elif phase == 'stop':
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assert self.gc_start_time is not None, "Stop phase out of sequence"
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self.gc_calls += 1
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self.gc_time += time.time() - self.gc_start_time
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self.gc_start_time = None
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self.gc_collected += info['collected']
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self.gc_uncollectable += info['uncollectable']
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else:
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assert False, f"Unrecognized gc phase ({phase!r})"
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def __exit__(self, *args: object) -> None:
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while self.gc_callback in gc.callbacks:
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gc.callbacks.remove(self.gc_callback)
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def get_stats(self) -> Mapping[str, float]:
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end_time = time.time()
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result = {}
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result['gc_time'] = self.gc_time
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result['gc_calls'] = self.gc_calls
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result['gc_collected'] = self.gc_collected
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result['gc_uncollectable'] = self.gc_uncollectable
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result['build_time'] = end_time - self.start_time
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return result
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