49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
from __future__ import annotations
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import gc
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import time
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from collections.abc import Mapping
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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: float | None = 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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"gc_time": self.gc_time,
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"gc_calls": self.gc_calls,
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"gc_collected": self.gc_collected,
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"gc_uncollectable": self.gc_uncollectable,
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"build_time": end_time - self.start_time,
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}
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return result
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