Programming Forums > Script Programming > Python

Sane · Dec 31st, 2005, 1:54 PM

I have two scripts running on my server,
- the server-side script which handles all incoming traffic
- a server manager which automatically makes backups, configures my IP, reboots the server, etc...

The server-side script has been reconfigured through CherryPy to only take up 3-4 CPU cycles. Python by default will take up all the remaining CPU cycles.

This raises a problem. My server manager takes up %96 of my CPU, doing nothing but waiting for a checkpoint while my server-side script slowly fulfills the main purpose of the computer.

How would I flip these CPU priorities around, making CherryPy by default take up the remaining cycles (instead of 3-4), and Python only take up 3-4?

Arevos · Dec 31st, 2005, 5:27 PM

If you're using Linux, or something similar, would using the renice and nice commands help?

Sane · Dec 31st, 2005, 7:07 PM

Nope, windows XP. Because I needed something that could be conveniently accessed from the shared folders, and used os calls I already knew.

Cerulean · Jan 1st, 2006, 10:00 AM

There is (unsurprisingly) an os.nice method to set the priority level, but i'm not sure if this only available on posix systems. Do you have that method available?

Sane · Jan 1st, 2006, 4:34 PM

>>> import os
>>> os.nice()

Quote:

Originally Posted by Python Shell

AttributeError: 'module' object has no attribute 'nice'

=(

Sane · Jan 1st, 2006, 10:43 PM

FOUND IT!

=D

(Toggle Plain Text)

from os import system
system( "start /realtime c:/windows/notepad.exe" )

# /low - Priority 4
# /belownormal - Priority 6
# /normal - Priority 8
# /high - Priority 13
# /realtime - Priority 24

So that would open notepad with a priority of 24/31. Yay.

Ooble · Jan 3rd, 2006, 6:36 PM

Don't use /realtime - it can screw things up. It takes a higher priority than critical system tasks - I can't explain why, but that be a Bad Thing. Use /high.

Sane · Jan 3rd, 2006, 10:19 PM

What's an example of a critical system task?

Ooble · Jan 4th, 2006, 9:36 AM

Y'know, I don't actually know. I'm really just spouting what I've been told, but I can kinda see why it would be a problem.

coldDeath · Jan 4th, 2006, 10:20 AM

Well i'm guessing here. Push ctrl+alt+del and clcik the processes tab, then look for SYSTEM processes, I would assume that at least one of those is vital.

Dec 31st, 2005, 1:54 PM	#1
Sane Programming Guru Join Date: Apr 2005 Posts: 1,799 Rep Power: 5	Setting a Script's CPU Priority I have two scripts running on my server, - the server-side script which handles all incoming traffic - a server manager which automatically makes backups, configures my IP, reboots the server, etc... The server-side script has been reconfigured through CherryPy to only take up 3-4 CPU cycles. Python by default will take up all the remaining CPU cycles. This raises a problem. My server manager takes up %96 of my CPU, doing nothing but waiting for a checkpoint while my server-side script slowly fulfills the main purpose of the computer. How would I flip these CPU priorities around, making CherryPy by default take up the remaining cycles (instead of 3-4), and Python only take up 3-4?

Jan 1st, 2006, 10:43 PM	#6
Sane Programming Guru Join Date: Apr 2005 Posts: 1,799 Rep Power: 5	FOUND IT! =D (Toggle Plain Text) from os import system system( "start /realtime c:/windows/notepad.exe" ) from os import system system( "start /realtime c:/windows/notepad.exe" ) # /low - Priority 4 # /belownormal - Priority 6 # /normal - Priority 8 # /high - Priority 13 # /realtime - Priority 24 So that would open notepad with a priority of 24/31. Yay.

Jan 3rd, 2006, 6:36 PM	#7
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Don't use /realtime - it can screw things up. It takes a higher priority than critical system tasks - I can't explain why, but that be a Bad Thing. Use /high. __________________ Me :: You :: Them

Jan 4th, 2006, 9:36 AM	#9
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Y'know, I don't actually know. I'm really just spouting what I've been told, but I can kinda see why it would be a problem. __________________ Me :: You :: Them

Jan 4th, 2006, 10:20 AM	#10
coldDeath Expert Programmer Join Date: Aug 2005 Location: UK Posts: 862 Rep Power: 3	Well i'm guessing here. Push ctrl+alt+del and clcik the processes tab, then look for SYSTEM processes, I would assume that at least one of those is vital. __________________ Programming Tutorials - Linux Installation Guide - Learn Python - Learn C++ Got Slack? Join us at #programmingforums @ irc.freenode.net! My software never has bugs. It just develops random features.

Dec 31st, 2005, 5:27 PM	#2
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 4	If you're using Linux, or something similar, would using the renice and nice commands help?

Dec 31st, 2005, 7:07 PM	#3
Sane Programming Guru Join Date: Apr 2005 Posts: 1,799 Rep Power: 5	Nope, windows XP. Because I needed something that could be conveniently accessed from the shared folders, and used os calls I already knew.

Jan 1st, 2006, 10:00 AM	#4
Cerulean Professional Programmer Join Date: Apr 2005 Location: London, England Posts: 459 Rep Power: 4	There is (unsurprisingly) an os.nice method to set the priority level, but i'm not sure if this only available on posix systems. Do you have that method available?

Jan 3rd, 2006, 10:19 PM	#8
Sane Programming Guru Join Date: Apr 2005 Posts: 1,799 Rep Power: 5	What's an example of a critical system task?

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Programming Forums > Script Programming > Python

Setting a Script's CPU Priority