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test_tsc_time.py
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test_tsc_time.py
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# Copyright (c) 2002-2011 IronPort Systems and Cisco Systems
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
"""Unittests for the tsc_time module."""
import struct
# import sysctl
import time
import unittest
from coro.clocks import tsc_time
class Test(unittest.TestCase):
# Stub test until we have a working sysctl
# def test_ticks_per_sec(self):
# freq = struct.unpack('I', sysctl.sysctl('machdep.tsc_freq'))[0]
# self.assertEqual(freq,
# tsc_time.ticks_per_sec
# )
# self.assertEqual(freq / 1000000,
# tsc_time.ticks_per_usec
# )
def _assert_close(self, a, b, diff):
low = a - diff
high = a + diff
self.assert_(low <= b <= high, '%r %r ~ %r' % (a, b, diff))
def test_raw_conversion(self):
now_t = tsc_time.now_tsc().tsc
now_up = tsc_time.get_kernel_usec()
now_p = now_up / 1000000
now_fp = float(now_up) / 1000000
# Conversion looses some accuracy.
ticks_close = (tsc_time.ticks_per_sec / 10.0)
p_close = 0
up_close = 100000
fp_close = 0.1
self._assert_close(now_t,
tsc_time.usec_to_ticks(now_up),
ticks_close
)
self._assert_close(now_up,
tsc_time.ticks_to_usec(now_t),
up_close
)
self._assert_close(now_t,
tsc_time.usec_to_ticks_safe(now_up),
ticks_close
)
self._assert_close(now_up,
tsc_time.ticks_to_usec_safe(now_t),
up_close
)
self._assert_close(now_t,
tsc_time.sec_to_ticks(now_p),
tsc_time.ticks_per_sec
)
self._assert_close(now_p,
tsc_time.ticks_to_sec(now_t),
p_close
)
self._assert_close(now_fp,
tsc_time.ticks_to_fsec(now_t),
fp_close
)
self._assert_close(now_t,
tsc_time.fsec_to_ticks(now_fp),
ticks_close
)
def test_time_methods(self):
t = tsc_time.now_tsc()
now_up = tsc_time.get_kernel_usec()
now_fp = float(now_up) / 1000000
self.assertEqual(time.ctime(now_fp), t.ctime())
self.assertEqual(time.localtime(now_fp), t.localtime())
self.assertEqual(time.gmtime(now_fp), t.gmtime())
self.assertEqual(time.strftime('%a %b %d %H:%M:%S %Y', time.localtime(now_fp)),
t.mkstr_local('%a %b %d %H:%M:%S %Y'))
self.assertEqual(time.strftime('%a %b %d %H:%M:%S %Y', time.gmtime(now_fp)),
t.mkstr_utc('%a %b %d %H:%M:%S %Y'))
def test_comparison(self):
t = tsc_time.now_tsc()
t2 = tsc_time.now_tsc()
self.assert_(t2 > t)
self.assert_(t < t2)
self.assert_(t.tsc + 1 > t)
self.assert_(t.tsc - 1 < t)
self.assert_(t.tsc + 1 > t)
self.assert_(t.tsc - 1 < t)
# Floating point uses larger numbers because of a loss in precision
# when converting to floating point, ex:
# >>> float(28536304964998994L)
# 28536304964998992.0
self.assert_(t.tsc + 1000.0 > t)
self.assert_(t.tsc - 1000.0 < t)
t = tsc_time.now_posix_sec()
time.sleep(2)
t2 = tsc_time.now_posix_sec()
self.assert_(t2 > t)
self.assert_(t < t2)
self.assert_(int(t) + 1 > t)
self.assert_(int(t) - 1 < t)
self.assert_(int(t) + 1 > t)
self.assert_(int(t) - 1 < t)
self.assert_(int(t) + 1.0 > t)
self.assert_(int(t) - 1.0 < t)
t = tsc_time.now_posix_usec()
time.sleep(0.1)
t2 = tsc_time.now_posix_usec()
self.assert_(t2 > t)
self.assert_(t < t2)
self.assert_(int(t) + 1 > t)
self.assert_(int(t) - 1 < t)
self.assert_(int(t) + 1 > t)
self.assert_(int(t) - 1 < t)
self.assert_(int(t) + 1.0 > t)
self.assert_(int(t) - 1.0 < t)
t = tsc_time.now_posix_fsec()
time.sleep(0.1)
t2 = tsc_time.now_posix_fsec()
self.assert_(t2 > t)
self.assert_(t < t2)
self.assert_(int(t) + 1 > t)
self.assert_(int(t) - 1 < t)
self.assert_(int(t) + 1 > t)
self.assert_(int(t) - 1 < t)
self.assert_(int(t) + 1.0 > t)
self.assert_(int(t) - 1.0 < t)
def test_math(self):
t = tsc_time.now_tsc()
self.assertEqual(t + 1, t.tsc + 1)
self.assertEqual(t - 1, t.tsc - 1)
self.assertEqual(t + 1, t.tsc + 1)
self.assertEqual(t - 1, t.tsc - 1)
# Removing floating point comparison because large floating point
# numbers loose precision, ex:
# >>> float(28536304964998994L)
# 28536304964998992.0
# self.assertEqual(t + 1.0, t.tsc + 1)
# self.assertEqual(t - 1.0, t.tsc - 1)
self.assertRaises(TypeError, lambda: t + 'hi')
self.assertRaises(TypeError, lambda: t - 'hi')
t = tsc_time.now_posix_sec()
self.assertEqual(t + 1, t.as_posix_sec() + 1)
self.assertEqual(t - 1, t.as_posix_sec() - 1)
self.assertEqual(t + 1, t.as_posix_sec() + 1)
self.assertEqual(t - 1, t.as_posix_sec() - 1)
self.assertEqual(t + 1.0, t.as_posix_sec() + 1)
self.assertEqual(t - 1.0, t.as_posix_sec() - 1)
self.assertRaises(TypeError, lambda: t + 'hi')
self.assertRaises(TypeError, lambda: t - 'hi')
t = tsc_time.now_posix_usec()
self.assertEqual(t + 1, t.as_posix_usec() + 1)
self.assertEqual(t - 1, t.as_posix_usec() - 1)
self.assertEqual(t + 1, t.as_posix_usec() + 1)
self.assertEqual(t - 1, t.as_posix_usec() - 1)
self.assertEqual(t + 1.0, t.as_posix_usec() + 1)
self.assertEqual(t - 1.0, t.as_posix_usec() - 1)
self.assertRaises(TypeError, lambda: t + 'hi')
self.assertRaises(TypeError, lambda: t - 'hi')
t = tsc_time.now_posix_fsec()
# We lose some precision with double conversions done in C versus
# Python's conversions.
self._assert_close(t + 1, t.as_posix_fsec() + 1, 0.001)
self._assert_close(t - 1, t.as_posix_fsec() - 1, 0.001)
self._assert_close(t + 1, t.as_posix_fsec() + 1, 0.001)
self._assert_close(t - 1, t.as_posix_fsec() - 1, 0.001)
self._assert_close(t + 1.0, t.as_posix_fsec() + 1, 0.001)
self._assert_close(t - 1.0, t.as_posix_fsec() - 1, 0.001)
self.assertRaises(TypeError, lambda: t + 'hi')
self.assertRaises(TypeError, lambda: t - 'hi')
def test_types(self):
t = tsc_time.now_tsc()
self.assertEqual(int(t), t.tsc)
self.assertEqual(long(t), t.tsc)
self.assertEqual(float(t), float(t.tsc))
t = tsc_time.now_posix_sec()
self.assertEqual(int(t), t.as_posix_sec())
self.assertEqual(long(t), t.as_posix_sec())
self.assertEqual(float(t), float(t.as_posix_sec()))
t = tsc_time.now_posix_usec()
self.assertEqual(int(t), t.as_posix_usec())
self.assertEqual(long(t), t.as_posix_usec())
self.assertEqual(float(t), float(t.as_posix_usec()))
t = tsc_time.now_posix_fsec()
self.assertEqual(int(t), t.as_posix_sec())
self.assertEqual(long(t), t.as_posix_sec())
self.assertEqual(float(t), t.as_posix_fsec())
def test_mktime(self):
for mktime_type in (tsc_time.mktime_tsc,
tsc_time.mktime_posix_sec,
tsc_time.mktime_posix_usec,
tsc_time.mktime_posix_fsec):
tt = time.localtime()
t = mktime_type(tt)
self.assertEqual(t.localtime(), tt)
def test_from(self):
now_tsc = tsc_time.now_tsc()
self.assertEqual(now_tsc.tsc,
tsc_time.TSC_from_ticks(now_tsc.tsc).tsc)
self.assertEqual(tsc_time.sec_to_ticks(now_tsc.as_posix_sec()),
tsc_time.TSC_from_posix_sec(now_tsc.as_posix_sec()).tsc)
self.assertEqual(tsc_time.usec_to_ticks(now_tsc.as_posix_usec()),
tsc_time.TSC_from_posix_usec(now_tsc.as_posix_usec()).tsc)
self.assertEqual(tsc_time.fsec_to_ticks(now_tsc.as_posix_fsec()),
tsc_time.TSC_from_posix_fsec(now_tsc.as_posix_fsec()).tsc)
self.assertEqual(now_tsc.tsc,
tsc_time.Posix_from_ticks(now_tsc.tsc).tsc)
self.assertEqual(tsc_time.sec_to_ticks(now_tsc.as_posix_sec()),
tsc_time.Posix_from_posix_sec(now_tsc.as_posix_sec()).tsc)
self.assertEqual(tsc_time.usec_to_ticks(now_tsc.as_posix_usec()),
tsc_time.Posix_from_posix_usec(now_tsc.as_posix_usec()).tsc)
self.assertEqual(tsc_time.fsec_to_ticks(now_tsc.as_posix_fsec()),
tsc_time.Posix_from_posix_fsec(now_tsc.as_posix_fsec()).tsc)
self.assertEqual(now_tsc.tsc,
tsc_time.uPosix_from_ticks(now_tsc.tsc).tsc)
self.assertEqual(tsc_time.sec_to_ticks(now_tsc.as_posix_sec()),
tsc_time.uPosix_from_posix_sec(now_tsc.as_posix_sec()).tsc)
self.assertEqual(tsc_time.usec_to_ticks(now_tsc.as_posix_usec()),
tsc_time.uPosix_from_posix_usec(now_tsc.as_posix_usec()).tsc)
self.assertEqual(tsc_time.fsec_to_ticks(now_tsc.as_posix_fsec()),
tsc_time.uPosix_from_posix_fsec(now_tsc.as_posix_fsec()).tsc)
self.assertEqual(now_tsc.tsc,
tsc_time.fPosix_from_ticks(now_tsc.tsc).tsc)
self.assertEqual(tsc_time.sec_to_ticks(now_tsc.as_posix_sec()),
tsc_time.fPosix_from_posix_sec(now_tsc.as_posix_sec()).tsc)
self.assertEqual(tsc_time.usec_to_ticks(now_tsc.as_posix_usec()),
tsc_time.fPosix_from_posix_usec(now_tsc.as_posix_usec()).tsc)
self.assertEqual(tsc_time.fsec_to_ticks(now_tsc.as_posix_fsec()),
tsc_time.fPosix_from_posix_fsec(now_tsc.as_posix_fsec()).tsc)
def test_negative_time(self):
now_tsc = tsc_time.now_tsc()
diff = 10 * 60 * tsc_time.ticks_per_sec
ago = now_tsc - diff
self._assert_close(ago.as_posix_sec(),
now_tsc.as_posix_sec() - 10 * 60,
1
)
self._assert_close(ago.as_posix_usec(),
now_tsc.as_posix_usec() - 10 * 60 * 1000000,
1000000
)
self._assert_close(ago.as_posix_fsec(),
now_tsc.as_posix_fsec() - 10 * 60,
0.3
)
# Microseconds in 1 year.
diff = long(365 * 24 * 60 * 60 * 1000000)
now_usec = tsc_time.now_posix_usec()
ago = now_usec - diff
self._assert_close(now_usec.as_posix_usec() - diff,
ago.as_posix_usec(),
10
)
year_ago = now_usec.as_posix_usec() - diff
year_ago_tsc = tsc_time.TSC_from_posix_usec(year_ago)
self._assert_close(year_ago_tsc.as_posix_usec(),
year_ago,
10
)
if __name__ == '__main__':
unittest.main()