Below are 2 files that isolate the problem. Note, both programs hang
(stop responding) with hyper-threading turned on (a BIOS setting), but
work as expected with hyper-threading turned off.
Note, the Windows task manager shows 2 CPUs on the Performance tab with
hyper-threading is turned on.
Both Python 2.3.5 and 2.4.3 (downloaded from python.org) have this
problem.
The operating system is MS Windows XP Professional.
winmsd.exe shows:
2CPUs: x86 Family 15 Model 4 Stepping 1 GenuineIntel ~3000 MHz
Version: 5.1.2600 Service Pack 2 Build 2600
Could someone with a hyper-threading (or dual/multicore) CPU please
confirm this bug?
Many Thanks
Olaf
# testsleep.py
import threading
import time
class Task(threading.Thread):
def __init__(self, n, t):
threading.Thread.__init__(self)
self.n = n
self.t = t
def run(self):
print 'thread %d started' % self.n
print 'sleep time:', self.t
print time.clock()
print time.clock()
print time.clock()
print
count = 0
printCount = int(10 / self.t)
while True:
start = time.clock()
time.sleep(self.t)
stop = time.clock()
if stop - start > 1.0:
print 'thread', self.n, stop - start
count += 1
if count > printCount:
count = 0
print self.n,
def test():
thread1 = Task(1, 0.01)
thread2 = Task(2, 0.003)
thread1.start()
thread2.start()
test()
------------------------------------------------------------------------
# testsleep2.py
import thread
import time
import sys
def run(n, t):
print 'thread %d started' % n
print 'sleep time:', t
print time.clock()
print time.clock()
print time.clock()
print
count = 0
printCount = int(10 / t)
while True:
start = time.clock()
time.sleep(t)
stop = time.clock()
if stop - start > 1.0:
print 'thread', n, stop - start
count += 1
if count > printCount:
count = 0
print n,
def test():
thread.start_new_thread(run, (1, 0.01))
thread.start_new_thread(run, (2, 0.003))
# Wait until the user presses the enter key.
sys.stdin.read(1)
test()
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