Can't start new thread

Hughes, Chad O chad.hughes at pnl.gov
Fri Aug 12 01:36:35 CEST 2005


> I am trying to understand what is causing python to raise this error
> when I create a number of threads:
> 
> thread.error: can't start new thread
> 
> I have been told that it is due to the default thread size (1 MB), but
> I have recompiled python defining an alternate threadsize, and I am
> not seeing any changes.  I defined the THREAD_STACK_SIZE in the
> thread_pthread.h file.
> 
> Any ideas?
> 
> Here is the code I am using to test the number of threads I can get
> running.  It maxis out at 1031.  I have tested it on two systems, one
> with 1GB of ram and another with 2GB of RAM.
> 
> import threading
> import time
> 
> class Mythread(threading.Thread):
>   def __init__(self):
>     self.__live = True
>     threading.Thread.__init__(self, target=self.runLoop)
>   def runLoop(self):
>     while self.__live:
>       time.sleep(.1)
>   def stop(self):
>     self.__live = False
>     
> threads = []
> max = raw_input("max: ")
> if max == 'None':
>   max = None
> else:
>   max = int(max)
> 
> while True:
>   print len(threads)
>   t = Mythread()
>   t.start()
>   threads.append(t)
>   if len(threads) == max:
>     break
> 
> print 'all running'
> 
> while True:
>   answer = raw_input("stop now? ")  
>   if answer in ['Y','y']:
>     break
>   
> print "stopping"
> for t in threads:
>   t.stop()
>   
> print "joining"
> for t in T:
>   t.join()
> 
> while True:
>   answer = raw_input("Quit now? ")  
>   if answer in ['Y','y']:
>     break
>   
> print "done"
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