THREADS use 100 % CPU all the time

[matthiasjanes@gmx.net]

Hi all,

I have a application where I use different threads. actually all is
working - BUT I just discovered that the [b]CPU is always 100 % [/
b]used.

on the 32-bit machine athlon XP, as well as on the amd 64-bit AMD
Athlon(TM) 64 X2 Dual-Core.

I have to admit I'm not used to threads. I actually use a thirdparty
scheduler http://www.webwareforpython.org/Task...Scheduler.html
but I checked and a very simple exampe with threading gives me also
all the time 100% CPU.

import threading, time

class TestThread ( threading.Thread ):
def run ( self ):
print 'TEST'

t = TestThread()
t.start()


while (True):
pass

Does anyone know how to run this without consuming all CPU.

regards,

MJ

[=?ISO-8859-1?Q?Thomas_Kr=FCger?=]

Re: THREADS use 100 % CPU all the time

matthiasjanes@g mx.net schrieb:

while (True):
pass

Does anyone know how to run this without consuming all CPU.

Your while loop is taking all the CPU time.

Thomas

--
sinature: http://nospam.nowire.org/signature_usenet.png

[A.B., Khalid]

Re: THREADS use 100 % CPU all the time

On Apr 11, 2:38 am, matthiasja...@g mx.net wrote:

Hi all,
>
I have a application where I use different threads. actually all is
working - BUT I just discovered that the [b]CPU is always 100 % [/
b]used.
>
on the 32-bit machine athlon XP, as well as on the amd 64-bit AMD
Athlon(TM) 64 X2 Dual-Core.
>
I have to admit I'm not used to threads. I actually use a thirdparty
scheduler http://www.webwareforpython.org/Task...Scheduler.html
but I checked and a very simple exampe with threading gives me also
all the time 100% CPU.
>

>
import threading, time
>
class TestThread ( threading.Thread ):
def run ( self ):
    print 'TEST'
>
t = TestThread()
t.start()
>
while (True):
    pass
>

>
Does anyone know how to run this without consuming all CPU.
>
regards,
>
MJ

You need your program to sleep a while to allow a switch to other
tasks. Like so:

###
import threading, time

class TestThread(thre ading.Thread):
def run(self):
print 'TEST'

t = TestThread()
t.start()

while (True):
time.sleep(0.01 )
pass
###


Regards

[matthiasjanes@gmx.net]

Re: THREADS use 100 % CPU all the time

On Apr 11, 1:36 pm, "A.B., Khalid" <kha...@yahoo.c omwrote:

>[QUOTE]
 import threading, time

	

		

			
			

			
				On Apr 11, 2:38 am, matthiasja...@g  mx.net wrote:
>
>
>

	

		

			
			

			
				 Hi all,
			
		
	
>

	

		

			
			

			
				 I have a application where I use different threads. actually all is
 working - BUT I just discovered that the [b]CPU is always 100 % [/
 b]used.
			
		
	
>

	

		

			
			

			
				 on the 32-bit machine athlon XP, as well as on the amd 64-bit AMD
 Athlon(TM) 64 X2 Dual-Core.
			
		
	
>

	

		

			
			

			
				 I have to admit I'm not used to threads. I actually use a thirdparty
 scheduler http://www.webwareforpython.org/Task...Scheduler.html
 but I checked and a very simple exampe with threading gives me also
 all the time 100% CPU.
			
		
	
>

	

		

			
			

			
				
			
		
	

			
		
	
>[QUOTE]
 class TestThread ( threading.Thread ):
 def run ( self ):
     print 'TEST'[/QUOTE]
>[QUOTE]
 t = TestThread()
 t.start()[/QUOTE]
>[QUOTE]
 while (True):
     pass[/QUOTE]
>[QUOTE]
 [/QUOTE]

>

Does anyone know how to run this without consuming all CPU.

>

regards,

>

MJ

>
You need your program to sleep a while to allow a switch to other
tasks. Like so:
>
###
import threading, time
>
class TestThread(thre ading.Thread):
def run(self):
print 'TEST'
>
t = TestThread()
t.start()
>
while (True):
time.sleep(0.01 )
pass
###
>
Regards[/QUOTE]



Thanks a lot both of you.

MJ

[Gabriel Genellina]

Re: THREADS use 100 % CPU all the time

En Wed, 11 Apr 2007 08:36:57 -0300, A.B., Khalid <khabkr@yahoo.c om>
escribió:

On Apr 11, 2:38 am, matthiasja...@g mx.net wrote:

>I have a application where I use different threads. actually all is
>working - BUT I just discovered that the [b]CPU is always 100 % [/
>b]used.
>>

You need your program to sleep a while to allow a switch to other
tasks. Like so:
>
t = TestThread()
t.start()
>
while (True):
time.sleep(0.01 )
pass

If all you want is to wait until the thread finishes, use t.join() instead
of that infinite loop.

--
Gabriel Genellina