CPU usage indicate how much of a workload is being handled by the CPU.

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106
votes
3answers
78k views

Why does MDS run wild in Mac OS X 10.6?

I've been having trouble with the MDS process running wild on my MacBook Pro 13". I've read on other support forums indicating that improperly formatted external drives can be an issue, but I have no ...
93
votes
9answers
23k views

Can a 7 days full 100% CPU load “burn-in” / “stress test” damage a modern notebook? [duplicate]

When I buy new computers, I usually do a "burn-in" with 100% CPU load for, say, seven days, in a well ventilated place. This is to find out if the computer has problems before I invest time into ...
85
votes
7answers
42k views

Determine which tab in Firefox is using CPU resources?

Is there anything in the current Firefox similar to shift-esc in Google Chrome? There is something that occasionally takes up enough CPU to make Firefox unresponsive - but with multiple windows, each ...
56
votes
4answers
45k views

What does load average mean in unix/linux?

If I run uptime, I get something like this: 10:50:30 up 366 days, 23:27, 1 user, load average: 1.27, 2.06, 1.54 What do those numbers on the end mean? The man page tells me it's "the load ...
55
votes
13answers
85k views

How can I produce high CPU load on Windows?

For testing purposes I need to generate high CPU load on a Windows Server 2003. I cannot install any software but have to make do with what Windows provides. What would be the best way to achieve ...
44
votes
4answers
134k views

Windows Update doesn't work and consumes 100% of CPU (Win7 SP1) [duplicate]

I've observed a strange behaviour with Windows Update (Win7 SP1). The process svchost is consuming an entire core of my Virtual Machine (VirtualBox) doing nothing (i.e., there is no network traffic ...
41
votes
3answers
39k views

Why is the CPU usage reported by top in Linux over 100%?

I've seen the CPU usage go over 100%. How is this possible? Is it because I have four CPU cores, so 100% isn't really the max? Also, when a program does this, what else can I do in top besides using ...
24
votes
2answers
38k views

What is a CPU tick?

Question: How is a CPU tick calculated and what does it represent? Does a single tick equate to 10 miliseconds thus if some thread reported not called for (5 * 10 ticks = 500 ticks) does this mean ...
23
votes
4answers
45k views

What is the cause of a high CPU usage of 'system and compressed memory' in Windows 10?

There is an observation to be made for Windows 10 on my laptop running with 24G memory available, and 2.5G used. There is no 'memory pressure'. Other questions have looked at memory consumption (...
22
votes
2answers
61k views

Troubleshoot High CPU usage by the “System” process

I have noticed that from some time my system is freezing and its probably caused by the high CPU usage which is caused by the system process. All applications I'm running is the Skype, TeamSpeak and ...
19
votes
12answers
125k views

How do I troubleshoot high 'svchost.exe' usage in Windows 7?

I'm having a problem with Windows 7 64-bit. I thought it was slow and all, but then I saw that the CPU usage was always around 80% and started searching for a solution. There are two svchost.exe's ...
18
votes
2answers
5k views

Is it okay to have 100% CPU usage constantly?

I often do 3D rendering in the background which consumes 100% of the CPU (I lower the priority of the process so that it does not hinder any tasks I am working on). My concern/question is whether it ...
18
votes
2answers
5k views

Determine which Opera tab uses 100% CPU?

Sometimes a tab gets stuck at using all CPU time it can get. I know theres a way to check which one for Chrome or Firefox -- is there a native method and/or extension to do this in Opera? Checking ...
14
votes
2answers
34k views

Linux: command to know the processor number in which a process is loaded?

Is there any command in linux to figure out , given a process, which processor the process is running? I am interested in figuring out the CPU busy and CPU idle time of that processor.
13
votes
6answers
91k views

What is the relationship between CPU usage and RAM?

I have seen many times that my CPU usage is 100% and my RAM is only occupied for about 50%. What is the relationship between these two? How does one's performance affects the other?
13
votes
1answer
27k views

How does windows “limit” the CPU (Power Options / Battery saving)

Can anyone explain how Windows effectively limits the CPU? Last time I tried some tricks to let my laptop not overheat, so I tried limiting the CPU to 70%. As for my suprise it stopped my laptop ...
12
votes
3answers
10k views

opendirectoryd consumes 40% of CPU

I have a MacBook Pro with Lion 10.7.2, 2.26 GHz CPU and 2GB DDR3 RAM. If I call top -o cpu the /usr/libexec/opendirectoryd process consumes more than 40% of CPU. $ ps aux | grep opend ...
12
votes
4answers
7k views

Windows 7 Firewall services consuming all CPU

I have Windows 7, 64-bit, installed on two computers: my Dell Dimension 5150, and my Dell Latitude D830. Today's gripe is this: Sometimes I look at my CPU usage thingie and I see something like this:...
11
votes
3answers
17k views

Task Manager shows 100% CPU utilization, but nothing in process list does

I'm using WinXP, and I notice that in the Task Manager, on the Performance tab my CPU usage is 100%. But When I go to the Processes tab, and sort by CPU System Idle Process is taking up 90%. I've ...
10
votes
6answers
8k views

Finder Using Nearly 100% CPU

I'm having a problem where the Finder uses WAY too much CPU time. It's using up to 100% of one of my cores. I'm running 10.6.2 on a MacBook Pro w/ 6GB of RAM, plenty of fast (SSD) disk space. I also ...
10
votes
4answers
4k views

why does Virtualbox use 15-20% CPU when VM is paused?

I run VirtualBox 3.1 on Ubuntu with a Win XP guest. I have noticed to my surprise that when I pause the VM (its screen grays out) VirtualBox continues using 15-20% of the host's CPU. Is this normal ...
10
votes
4answers
2k views

Multicore CPU energy requirement and load balancing

I am interested in load balancing for multicore CPU systems. If you use 1 CPU with multiple cores, is it more energy efficient to balance the load on several cores, or try to fill up single cores and ...
10
votes
3answers
3k views

When steam is downloading it uses all my cpu

My friends say it's just me, but whenever Steam updates or downloads - which can take hours - it uses 99% of the CPU, makes everything else slow, and is itself glacial to respond at all. Does anyone ...
10
votes
2answers
5k views

Why does my iTunes use so much CPU time?

I have a roughly 2 year old Macbook (10.5). I have iTunes 10. When iTunes is playing MP3s, I see CPU usage of the iTunes process in the system monitor ranging from 65%-75%. When I pause the music, I ...
9
votes
5answers
15k views

CPU usage at 100% for several hours

If I use a processor at 100% constantly for several hours, can that damage the machine?
9
votes
1answer
747 views

Does a CPU clock frequency vary on-demand?

On my machine (not a personal computer), I have 4 cores (2.4GHz) and I currently don't have any important process running. Right now, are all of my 4 cores running/vibrating at 2.4GHz or are some of ...
9
votes
2answers
2k views

Limit CPU usage for flash in Firefox?

How can we limit the CPU usage of Flash plugins in Firefox ? I do not want to disable Flash, but I don't need to Flash objects to run at full speed either, in order to save battery power.
8
votes
5answers
12k views

Why does Firefox cause high-CPU-usage “spikes” every few seconds?

When I start Firefox, I have no problems for a while, but after a couple of days, CPU spikes start to occur. During a spike, Firefox freezes and then stops. Spikes occur every seven to ten seconds, ...
8
votes
6answers
49k views

Is a CPU fan speed of 3590 RPMs normal?

Ant pointed me to SpeedFan in this stackoverflow question. I downloaded SpeedFan and it reports that my CPU temperature peaks at about 73C which seems to be normal according to this chart (although ...
8
votes
2answers
9k views

How to increase Python's CPU usage

I use Python to execute some algorithms and no matter which Python I use, and I have tried many versions, the CPU usage goes to 25% max. Why doesn't Python take advantage of the rest of my CPU ...
8
votes
4answers
17k views

spoolsv.exe consumes all CPU and RAM resources

Consider a Windows 7 x64 installation with 2 printers installed. The system has 8GB installed RAM. One printer is a Brother laser MFC-8220 Printer via TCP/IP, and the other is a CutePDF printer. ...
8
votes
2answers
11k views

How to decrease the CPU usage when running Virtual Box?

I am facing an issue with 100% CPU usage under my system when running VirtualBox. Here are some further details: My System Information: CPU 1 name: Intel(R) Pentium(R) Dual CPU T2310 @ 1....
8
votes
2answers
40k views

TrustedInstaller.exe is eating all CPU; 100%

I have bought an ASUS ux50v for my wife (so pleeeeeaaaase help!), it has a single core cpu and Windows 7 Home Premium installed. I have updated it's os (made a mistake?) and now this TrustedInstaller....
8
votes
1answer
28k views

What is the impact of running the CPU at 100% for long periods at a time? [duplicate]

Possible Duplicate: Is it ok to have 100% CPU usage constantly I recently upgraded computers and with this upgrade I decided to try Seti@Home to run in the background. I was watching the CPU ...
7
votes
2answers
11k views

System (ACPI.sys) is always using about 15-20% of my CPU

I have a 13" Sony Vaio laptop (model SVS13A1C5E) and I upgraded it to Windows 8 with a fresh install, after upgrading I installed Win8 drivers listed here. Now I have a problem with the CPU usage (it ...
7
votes
6answers
18k views

ngen.exe is constantly using CPU

I recently installed Windows 7. This was a clean install (i.e. not an upgrade from another version of Windows), but I did install a bunch of other programs. All mainstream applications - nothing wacky....
7
votes
2answers
125k views

svchost.exe using lots of memory slowing my PC down [duplicate]

On my Windows 7 32-bit. svchost.exe is using lots of Memory and slowing my PC down big time. I already have auto update turned off and it is on manual mode. How can I fix this problem? Thanks
7
votes
3answers
22k views

How can I monitor the CPU usage of one process over a period of time?

I want to know what the average CPU usage is of a particular executable on my PC over a day. I could write a C# app to do this, but I figured this is exactly the sort of app Superuser would know ...
7
votes
5answers
17k views

How can I investigate 99% CPU usage by w3wp.exe?

w3wp.exe is showing 99% CPU usage. What are the best ways to investigate the cause of this high CPU usage?
7
votes
4answers
3k views

Why is my CPU usage broken in Process Explorer?

On my system (Windows 7), it seems that Process Explorer is reporting the wrong CPU usage: When Firefox is running, I constantly get 30%+ When I kill Firefox, I still get about the same CPU usage ...
7
votes
2answers
8k views

IPHLPSVC High CPU in Windows 8 x64

I was experiencing consistent high CPU usage in Windows 8 Pro x64. The cause was svchost running at a constant 25% CPU, even at idle. I checked the services that the svchost was running, and toggled ...
7
votes
3answers
26k views

Windows 7 CPU usage high for Explorer.exe and DWM.exe

I'm using Windows 7 Ultimate. I get a problem with two processes: explorer.exe and sometimes dwm.exe. The two processes tend to have a CPU usage between 20-30%. It only occurs when I play games on my ...
6
votes
5answers
10k views

Reduce Mac OS X's Flash CPU usage

I have been experiencing high CPU usage (138%) on my MacBook, while looking at flash videos on the internet with the Firefox browser. Mostly this usage makes itself noticeable by the loud noise of the ...
6
votes
4answers
11k views

Writing a CPU/RAM usage log over a period of time to file on CentOS

I'm looking for an application or line of code that would let me observe a process, save the info in a number of variables, then put the gathered info on a file. I've been trying with variations of ...
6
votes
5answers
7k views

How to tell which process is hogging my CPU when they don't add up to 100%?

Ubuntu's System Monitor applet shows 100% CPU usage continuously. If I click it, the resources tab shows it at 100% continuously, too. If I go to processes, though, to find out which process is the ...
6
votes
3answers
22k views

Why won't Windows use the other CPU cores?

In Windows Task Manager the Performance tab shows the first CPU maxed out, the other 7 just idling along with the occasional spike. What gives? More info: I've got 8GB and only 4.5GB are being used. ...
6
votes
3answers
9k views

How to get I/O usage by process in Unix? [duplicate]

Possible Duplicate: Linux: Is there something similar to "top" for I/O? I am trying to do some CPU intensive operation on a Linux machine and it is showing very high load. I want to ...
6
votes
3answers
6k views

CPU usage goes up while computer enters into screensaver/screen goes dark

Computer/Laptop: Lenovo T500 When I leave my PC, it turns off the display after X minutes. That's fine. However, since I use "Proccess Explorer" (SysInternals) there is a bit of a history in my ...
6
votes
1answer
2k views

Windows 8 Release Preview - Extremely High Idle CPU Usage

Using Windows 8 RP, my computer is sustaining a 26.6% CPU usage while sitting at the desktop doing absolutely nothing. The other day it was over 50%. The entire usage is due to a process called "...
6
votes
1answer
2k views

Heavy CPU Usage for Interrupt

As a follow-up to the question Why can't my computer speed up again after closing large applications? … I used Process Explorer to check my PC. I found that there's an average 30-40% of CPU ...