replace custom clock helpers with time module (#29499)

* replace custom clock stuff wtih time module

* fix double

* fix release

* bump cereal

* update type

* fix one more
old-commit-hash: d61f86d3398900ef01423d24cfdf897392a8efbb

common/SConscript

@@ -31,5 +31,4 @@ if GetOption('test'):
   env.Program('tests/test_swaglog', ['tests/test_swaglog.cc'], LIBS=[_common, 'json11', 'zmq', 'pthread'])
 
 # Cython
-envCython.Program('clock.so', 'clock.pyx')
 envCython.Program('params_pyx.so', 'params_pyx.pyx', LIBS=envCython['LIBS'] + [_common, 'zmq', 'json11'])

common/clock.pyx

@@ -1,24 +0,0 @@
-# distutils: language = c++
-# cython: language_level = 3
-from posix.time cimport clock_gettime, timespec, CLOCK_MONOTONIC_RAW, clockid_t
-
-IF UNAME_SYSNAME == "Darwin":
-  # Darwin doesn't have a CLOCK_BOOTTIME
-  CLOCK_BOOTTIME = CLOCK_MONOTONIC_RAW
-ELSE:
-  from posix.time cimport CLOCK_BOOTTIME
-
-cdef double readclock(clockid_t clock_id):
-  cdef timespec ts
-  cdef double current
-
-  clock_gettime(clock_id, &ts)
-  current = ts.tv_sec + (ts.tv_nsec / 1000000000.)
-  return current
-
-def monotonic_time():
-  return readclock(CLOCK_MONOTONIC_RAW)
-
-def sec_since_boot():
-  return readclock(CLOCK_BOOTTIME)
-

common/realtime.py

@@ -5,9 +5,8 @@ import time
 from collections import deque
 from typing import Optional, List, Union
 
-from setproctitle import getproctitle  # pylint: disable=no-name-in-module
+from setproctitle import getproctitle
 
-from common.clock import sec_since_boot  # pylint: disable=no-name-in-module, import-error
 from system.hardware import PC
 
 
@@ -50,13 +49,13 @@ class Ratekeeper:
   def __init__(self, rate: float, print_delay_threshold: Optional[float] = 0.0) -> None:
     """Rate in Hz for ratekeeping. print_delay_threshold must be nonnegative."""
     self._interval = 1. / rate
-    self._next_frame_time = sec_since_boot() + self._interval
+    self._next_frame_time = time.monotonic() + self._interval
     self._print_delay_threshold = print_delay_threshold
     self._frame = 0
     self._remaining = 0.0
     self._process_name = getproctitle()
     self._dts = deque([self._interval], maxlen=100)
-    self._last_monitor_time = sec_since_boot()
+    self._last_monitor_time = time.monotonic()
 
   @property
   def frame(self) -> int:
@@ -82,11 +81,11 @@ class Ratekeeper:
   # this only monitor the cumulative lag, but does not enforce a rate
   def monitor_time(self) -> bool:
     prev = self._last_monitor_time
-    self._last_monitor_time = sec_since_boot()
+    self._last_monitor_time = time.monotonic()
     self._dts.append(self._last_monitor_time - prev)
 
     lagged = False
-    remaining = self._next_frame_time - sec_since_boot()
+    remaining = self._next_frame_time - time.monotonic()
     self._next_frame_time += self._interval
     if self._print_delay_threshold is not None and remaining < -self._print_delay_threshold:
       print(f"{self._process_name} lagging by {-remaining * 1000:.2f} ms")