Issue1484172
This issue tracker has been migrated to GitHub,
and is currently read-only.
For more information,
see the GitHub FAQs in the Python's Developer Guide.
Created on 2006-05-08 21:45 by olafmeding, last changed 2022-04-11 14:56 by admin. This issue is now closed.
Messages (3) | |||
---|---|---|---|
msg28453 - (view) | Author: Olaf Meding (olafmeding) | Date: 2006-05-08 21:45 | |
Below are 2 files. The first is a Python program that demonstrates the problem within less than 1 hour (often just a few minutes). The second is a C++ program that shows that the Win32 Sleep() function works as expected (the program was started 3 days ago and is still running). Note, I also attached the source code. Note, the Python programs hangs (stops responding) with hyper-threading turned on (a BIOS setting), but works as expected with hyper-threading turned off. This problem happens on Windows only (the below Python program ran for 24 hours on Linux without a problem). Variations of the Python program also lock up: Tried importing win32api instead of importing time and using the win32api.GetTickCount() and win32api.Sleep() methods. Tried using lock = threading.Event() and lock.wait() instead of time.sleep(). Tried importing Queue and using q = Queue.Queue() and q.get(True, sleepTime). 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 (Start Menu > Run) 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-core or multi-processor) CPU please confirm this bug? Many Thanks Olaf Here is the expected output of both programs (the progam has locked up if the numbers stop printing every 10 seconds or so): python testsleep.py thread 1 started, sleep time 0.010 thread 2 started, sleep time 0.003 1 1 1 2 1 1 1 2 1 1 1 2 1 1 1 1 2 1 1 1 # testsleep.py import threading import time class Task(threading.Thread): def __init__(self, n, t): threading.Thread.__init__(self) self.n = n # thread id self.t = t # sleep time def run(self): print 'thread %d started, sleep time %.3f' % (self.n, self.t) 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, # print sign of live def test(): thread1 = Task(1, 0.01) # thread 1, sleep 10 ms thread2 = Task(2, 0.003) # thread 2, sleep 3 ms thread1.start() thread2.start() test() ------------------------------------------------------- --------------------------- // testsleep.cpp // Compiled with Visual C++ version 6 (in debug mode) as a Win32 console application. #include <windows.h> #include <stdio.h> #include <time.h> typedef struct { int id; int ms; } param_s; DWORD WINAPI threadFunction(LPVOID param) { param_s* p = (param_s*)param; long elapsedTime; long time1, time2; long printCount = long(10000 / p->ms); // loop iterations in 10 seconds long count = 0; printf("thread %d started, sleep time: %d ms" "\n", p->id, p->ms); while(true) { time1 = GetTickCount(); Sleep(p->ms); time2 = GetTickCount(); elapsedTime = time2 - time1; if(elapsedTime > 1000) printf("thread %d slept for %d ms" "\n", p- >id, elapsedTime); count++; if(count > printCount) { count = 0; printf("%d ", p->id); // print sign of live } } return 0; } int main(int argc, char* argv[]) { param_s p1, p2; p1.id = 1; p1.ms = 10; p2.id = 2; p2.ms = 3; CreateThread(NULL, 0, threadFunction, (void*)&p1, 0, NULL); CreateThread(NULL, 0, threadFunction, (void*)&p2, 0, NULL); getchar(); // wait until the user presses the enter key. return 0; } |
|||
msg28454 - (view) | Author: Tim Peters (tim.peters) * | Date: 2006-05-08 21:58 | |
Logged In: YES user_id=31435 As noted (multiple times by now ;-)) on c.l.py, the Python program does not hang on my similar HT box: http://mail.python.org/pipermail/python-list/2006-May/340538.html |
|||
msg28455 - (view) | Author: Tim Peters (tim.peters) * | Date: 2006-05-31 00:54 | |
Logged In: YES user_id=31435 Closing as 3rd-party, Works For Me. On c.l.py today the OP reported that a BIOS upgrade repaired the problem: """ The problem turned out to be the BIOS of the PC we were using. The Python test program has been running fine for 5 days now (after we upgraded the system BIOS) and is still running fine. Sorry, I do not have any information as to what was fixed in the BIOS. Also, I do not know exactly who made the motherboard or the BIOS. I will post another update if this information becomes available. This was sure a strange bug! """ |
History | |||
---|---|---|---|
Date | User | Action | Args |
2022-04-11 14:56:17 | admin | set | github: 43334 |
2006-05-08 21:45:44 | olafmeding | create |