87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
# Copyright (c) 2026 SandAI. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from datetime import datetime
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from typing import Callable
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import torch
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from .logger import print_rank_0
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class EventPathTimer:
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"""
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A lightweight class for recording time without any distributed barrier.
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This class allows for recording elapsed time between events without requiring
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synchronization across distributed processes. It maintains the previous message
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and time to calculate the duration between consecutive records.
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"""
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def __init__(self):
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"""
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Initialize the EventPathTimer.
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This constructor sets the previous message and time to None, preparing
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the instance for recording events.
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"""
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self.prev_message: str = None
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self.prev_time: datetime = None
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def reset(self):
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"""
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Reset the recorded message and time.
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This method clears the previous message and time, allowing for a fresh
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start in recording new events.
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"""
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self.prev_message = None
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self.prev_time = None
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def synced_record(self, message, print_fn: Callable[[str], None] = print_rank_0):
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"""
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Record the current time with a message.
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Args:
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message (str): A message to log along with the current time.
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This method synchronizes the CUDA operations, records the current time,
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and calculates the elapsed time since the last recorded message, if any.
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It then logs the elapsed time along with the previous and current messages.
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"""
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torch.cuda.synchronize()
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current_time = datetime.now()
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if self.prev_message is not None:
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print_fn(
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f"\nTime Elapsed: [{current_time - self.prev_time}] From [{self.prev_message} ({self.prev_time})] To [{message} ({current_time})]"
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)
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self.prev_message = message
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self.prev_time = current_time
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_GLOBAL_LIGHT_TIMER = EventPathTimer()
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def event_path_timer() -> EventPathTimer:
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"""Get the current EventPathTimer instance.
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Returns:
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EventPathTimer: The current EventPathTimer instance.
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Raises:
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AssertionError: If the EventPathTimer has not been initialized.
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"""
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assert _GLOBAL_LIGHT_TIMER is not None, "light time recorder is not initialized"
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return _GLOBAL_LIGHT_TIMER
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