mersenneforum.org  

Go Back   mersenneforum.org > New To GIMPS? Start Here! > Information & Answers

Reply
 
Thread Tools
Old 2021-10-14, 10:14   #1
ProbableUser
 
Oct 2021

2 Posts
Default How to lower cpu usage?

Hi,


i just installed gimps and it said it uses the energy of a small lamp. But actually my CPU is running on 50%
and the fan is very loud. How can i change that?
ProbableUser is offline   Reply With Quote
Old 2021-10-14, 13:36   #2
Uncwilly
6809 > 6502
 
Uncwilly's Avatar
 
"""""""""""""""""""
Aug 2003
101×103 Posts

13·19·41 Posts
Default

Welcome to the forum and GIMPS.

Prime95 is designed to use all of you CPU capacity (the 50% is just the machine pretending it has more CPU than it does [hyperthreading].)

Prime95 does have a setting that you can use to reduce the amount of time it uses the CPU. Here is the section about it in the undoc.txt file that comes with Prime95
Code:
If you are running on a laptop or in a hot room and you want to slow the
program down to reduce heat, then you can add this line to prime.txt:
	Throttle=n
where n is the percentage of time the program should run.  For example,
Throttle=40 means the program will run 40% and be idle 60% of the time.
Hope that can get the noise down some. Also, if this is an older machine, consider opening the case and cleaning out any dust.
Uncwilly is offline   Reply With Quote
Old 2021-10-14, 13:57   #3
kruoli
 
kruoli's Avatar
 
"Oliver"
Sep 2017
Porta Westfalica, DE

28·3 Posts
Default

If you have interest/experience in underclocking and undervolting, this might give you a larger decrease in power usage than in throughput. You might even be able to keep your throughput and lower the power usage somewhat. But be warned, this may cause instabilities and/or errorneous calculation results!
kruoli is online now   Reply With Quote
Old 2021-10-14, 15:19   #4
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

7,691 Posts
Default

Better than Throttle=n is to reduce the number of worker windows and/or the number of cores used by each worker. This can be done from Test/Worker Windows dialog box. Though, undervolting and underclocking is the best solution.

Welcome to the forum!
Prime95 is offline   Reply With Quote
Old 2021-10-14, 20:09   #5
ProbableUser
 
Oct 2021

2 Posts
Default

Quote:
Originally Posted by Prime95 View Post
Better than Throttle=n is to reduce the number of worker windows and/or the number of cores used by each worker.

Hey thank you, that fixed it!
ProbableUser is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lower speeds after upgrading the cpu. wagner85 Information & Answers 27 2020-11-24 18:35
Lower Lip R.D. Silverman Soap Box 10 2013-07-30 14:50
lower CPU usage to solve heating problems Blue Lite Linux 4 2006-01-07 05:16
How do I lower Prime95's CPU Usage? Unregistered Software 21 2003-12-13 15:26
Where do I find undoc.txt to lower the usage? Unregistered Software 3 2003-12-12 21:47

All times are UTC. The time now is 10:51.


Wed Dec 8 10:51:16 UTC 2021 up 138 days, 5:20, 1 user, load averages: 1.77, 1.57, 1.42

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.