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# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the license found in the
# LICENSE file in the root directory of this source tree.
from time import time
class TimerError(Exception):
def __init__(self, message):
self.message = message
super().__init__(message)
class Timer:
"""A flexible Timer class.
Examples:
>>> import time
>>> import mmcv
>>> with mmcv.Timer():
>>> # simulate a code block that will run for 1s
>>> time.sleep(1)
1.000
>>> with mmcv.Timer(print_tmpl='it takes {:.1f} seconds'):
>>> # simulate a code block that will run for 1s
>>> time.sleep(1)
it takes 1.0 seconds
>>> timer = mmcv.Timer()
>>> time.sleep(0.5)
>>> print(timer.since_start())
0.500
>>> time.sleep(0.5)
>>> print(timer.since_last_check())
0.500
>>> print(timer.since_start())
1.000
"""
def __init__(self, start=True, print_tmpl=None):
self._is_running = False
self.print_tmpl = print_tmpl if print_tmpl else '{:.3f}'
if start:
self.start()
@property
def is_running(self):
"""bool: indicate whether the timer is running"""
return self._is_running
def __enter__(self):
self.start()
return self
def __exit__(self, type, value, traceback):
print(self.print_tmpl.format(self.since_last_check()))
self._is_running = False
def start(self):
"""Start the timer."""
if not self._is_running:
self._t_start = time()
self._is_running = True
self._t_last = time()
def since_start(self):
"""Total time since the timer is started.
Returns:
float: Time in seconds.
"""
if not self._is_running:
raise TimerError('timer is not running')
self._t_last = time()
return self._t_last - self._t_start
def since_last_check(self):
"""Time since the last checking.
Either :func:`since_start` or :func:`since_last_check` is a checking
operation.
Returns:
float: Time in seconds.
"""
if not self._is_running:
raise TimerError('timer is not running')
dur = time() - self._t_last
self._t_last = time()
return dur
_g_timers = {} # global timers
def check_time(timer_id):
"""Add check points in a single line.
This method is suitable for running a task on a list of items. A timer will
be registered when the method is called for the first time.
Examples:
>>> import time
>>> import mmcv
>>> for i in range(1, 6):
>>> # simulate a code block
>>> time.sleep(i)
>>> mmcv.check_time('task1')
2.000
3.000
4.000
5.000
Args:
str: Timer identifier.
"""
if timer_id not in _g_timers:
_g_timers[timer_id] = Timer()
return 0
else:
return _g_timers[timer_id].since_last_check()
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