The CPU (Central Processing Unit) is the part of a computer that performs tasks instructed by the computer programs. Its role is somewhat analogous to that of the human brain; it performs simple mathematical, logical, and in/out operation of the machine.

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Retina MacBook Pro running very hot?

I have a late-2013 Retina MacBook Pro, and it gets really hot really easily. I've monitored the temp with htop and iStat and they both show the same readings. It's supposed to be able to play some ...
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770 views

Changing CPU frequency policies in OS X

I have Core i5 processor with nominal 2.3 Ghz speed. But, according to Intel Power Gadget, most of the time the frequency is much lower. Even during intensive usage. It's 0.8-1.6 Ghz. I noticed that ...
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iPhone: What is `accountsd` and why is it using 80% CPU?

I just got a new iPhone 6 for my SO and noticed that it is quite toasty to handle with the battery draining quite fast. It has been 24 hours since I first set it up. I plugged it into Instruments ...
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1answer
79 views

Application eating ~840,000,000% of my CPU

I noticed that sometime some application are using some impossibly high amount of my CPU according to the Activity Monitor, as the screenshots below illustrate. How comes Activity Monitor displays ...
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1answer
86 views

High CPU and energy usage in Safari

Energy impact of Safari is extremely high on my Macbook Air Mid 2013 El Captian 10.11.2. It lead to high usage of CPU (Temperature ~65.0°C) and the CPU fan is running in full speed (6500.0 RPM) ...
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80 views

is iPhone 5S 2-times faster than iPhone 5 at Graphics Task (like Gaming) due to 64-bit CPU?

Phil Schiller talked about "iPhone 5S" This is the first-ever 64-bit processor in a phone of any kind. I don’t think the other guys are even talking about it yet. Why go through all this? The ...
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How does my dual core i5 in my MacBook Pro have more than 400% CPU usage?

I've got the Early-2015 13" MacBook Pro (2.7 GHz i5) and whilst I was building Smart Previews for all my 1600+ photos in Lightroom 5 I noticed that the fan had come on (unusually) and that the laptop ...
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25 views

Limit CPU when starting a task in terminal

I'm working on an application for part of a school project that simulates an operating system and which I launch using the Terminal. By nature it will consume all possible resources to loop over and ...
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39 views

MacBook Pro 13" 2015 CPU and GPU temperatures

I've noticed that my new MacBook Pro 13" 2015 (MF839) is getting hot while playing browser games or watching models at sketchfab.com. Both CPU and GPU temperatures rise to 100-105 degrees (Celsius) ...
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28 views

Is there any more way to squeeze out some performance out of my mid 2009 Macbook Pro 13"?

I still like my mid 2009 13" Macbook Pro. It's solid and running quite well. However, since Yosemite things are getting really laggy and slow, so I guess that my hardware is getting a bit old. ...
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How to disable HyperThreading on Mac OS X Yosemite?

I read that on previous versions of OS X it was possible via hwprefs but I didn't figure out how to use it on 10.10.* (looks like it was removed). I need to disable HyperThreading for Wineskin.
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194 views

Why does htop show different CPU levels for processes than top or Activity Monitor?

I installed htop through brew, real pleasure of a view compared with top. The totals across both CPUs for top align with the sum of totals per-CPU in htop. E.g. right now I see about 40% per CPU in ...
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1answer
127 views

Ejecting SD card takes a long time and CPU usage goes up

I'm on Mavericks and after I eject most SD cards, it takes a minute or two and process UASysAgent is taking 80% of the CPU... quite annoying, does anyone else experience this? Something that can be ...
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1answer
350 views

MacBook Air slow after waking from sleep

The backlight on my MacBook Air broke about a week ago and it fixed by Apple by them replacing the logic board. Since I've got it back I've had a couple of issues. Firstly, the machine wouldn't work ...
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65 views

Is it possible to disable CPU throttling on a MacBook Pro with a completely dead (not recognized) battery?

I have a MBP late 2011 running El Capitan, recently my battery died (x over the icon and "no battery available" in the dropdown.) I've noticed since then that CPU intensive tasks are very slow, and I ...
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0answers
1k views

Why is Mail.app using so much CPU with gmail and Exchange?

My Mail.app is configured for Gmail and Exchange. For some time now the program has been running out of control. It's pretty much constantly burning 100% of CPU (but only 100%). It's got an ...
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390 views

What causes the UserEventAgent to run with 100% CPU usage?

Since about a month, my MBPr sometimes starts up it’s fans and is getting really hot. The activity monitor tells me, that this is because of the UserEventAgent, which runs with 100% CPU usage. This ...
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122 views

Figure out which app is using Java

If I check my activity monitor there is an instance of java that is constantly taking 5% CPU or more. I know that there is some app that are using java on my system and therefore my question is: Is ...
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cpu is 100% used, yet no application shows significant usage

Since a few days my IMac started showing weird behaviour. In Activity Monitor it shows that my CPU is 100% used. Literally 0% idle, but there are no Applications using anywhere near this much ...
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259 views

How to monitor and control thermal CPU throttling in OS X?

I recently came across the Intel Extreme Tuning Utility for Windows. I tried it under Bootcamp Windows and it was very interesting to learn in what situations my MacBook Pro's (mid2012) CPU is doing ...
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115 views

launchd using 100% CPU for 20 seconds once per minute

I'm trying to track down a problem with launchd on OS X 10.9.5. Once every minute, launchd spikes to 100% cpu for about 20 second or so, then goes back to minimal cpu usage. So thats ~20 seconds at ...
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153 views

How to find Intel SKU for Mac CPUs

Seems like everywhere you can go to purchase a laptop they specify the Intel SKU for each CPU option - except Apple. If you have a Mac, you can apparently find this info using the following command: ...
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crashing MBP :(

I have a MBP from 2010 with 2.4 Ghz Intel Core 2 Duo and 4 GB of RAM. Lately I am getting many kernel panics when my MBP is under high load, such as when copying, playing video's, editing etc. ...
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How to diagnose/fix error when booting a G5

I have an Apple G5 and it won boot anymore. When I boot my fan starts to spin like a madman and the screen stays grey. When I try to boot in Safe Mode using Shift-Command-V, I get the error message: ...
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450 views

How to make MacOS X ignore nice load when scaling CPU frequencies (“ignore_nice_load” on Linux)?

Is it possible to control/configure the CPU frequency governor on MacOS X? I would like it to ignore load/work from "niced" processes and not spin up the CPU frequency? On Linux this can be ...
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com.apple.dock.extra - maxing CPU

I've recently installed Mountain Lion and the com.apple.dock.extra process is suddenly constantly active - and is maxing my CPU usage. Activity monitor is showing usage running from as low as 45% to ...
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How to make sense of >100% CPU usage and re-spawning of a force-quitted process?

My MBP was making loud noises again so I opened up my activity manager and I was baffled to see that the CPU usage of mutt is more than 100%. This is strange because all I was doing in it was to ...
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17 views

Diagnosing cooling issues on MacBook Air

I suspect the fan on my 2011 MacBook Air is not cooling efficiently, as it runs over 5000 RPM when I'm browsing the web and the CPU is around 75% idle. Is there any published benchmark for what the ...
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94 views

High CPU usage when Your iCloud session has expired

I have had this problem here: El Capitan: Your iCloud session has expired In addition to this I noticed that iTunes is using nearly 100% of the CPU and the fans go crazy. After logging and fixing ...
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92 views

excessive cpu usage from kernel_task after accidentally ripping Facetime HD camera connector off the logic board

Accidentally ripped off the Facetime HD camera cable of the logic board. Now whenever I boot into OS X kernel_task hogs all the cpu (500%). I could be wrong here, but my hunch is that because no ...
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64 views

Macbook Air thinks it's overheating

Recently my Mid-2013 macbook air began to act like it's overheating. Upon boot the cpu fan almost immediately spins up to 100% (over 6000 rpm) and the cpu heavily thermal throttles. I am positive the ...
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64 views

Verify Intel Speedstep active with sysctl

I want to verify that Intel Speedstep throttling is indeed inactivated in my OS X 10.9.5 Mavericks MacBook Pro (2009) system. I used the Rhys Oxenham method from 2012. Unfortunately I can't run Intel ...
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101 views

CPU usage for User tasks consuming up to 80%; 0% Idle. What does it mean?

I have noticed that my CPU usage is always near 100%. 0% of it is for Idle. About 20% average is for System tasks. The rest is going to User tasks (80%). But if I look at individual tasks don't see ...
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123 views

High CPU usage during disk operations

Early 2009 17" MacBookPro (MacBookPro5,2) 2.66 GHz Intel Core 2 Duo OS X Yosemite 10.10.3 240 GB OWC Mercury SSD, installed in 2010 I've had issues with high CPU usage for a while now. The original ...
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248 views

Why does my Macbook Pro get very hot at seemingly random times? Possibly Safari-related?

I have a late-2014 15" MBP with max specs running 10.10.3, and it usually has no problem handling most of what I throw at it (running multiple resource-intensive apps at once, editing large files in ...
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175 views

Skype is using 60% to 80% CPU

I have a Mid-2014 15" MacBook Pro with an Nvidia graphics card. Skype uses around 60% - 80% CPU on my computer when I make a call (doesn't matter if it is video or voice call). I tried doing SMC and ...
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0answers
171 views

macbook air mid 13 overheating

My set up is macbook air mid 13 with i7 processor and 8GB of ram running OS X Yosemite. Which is plenty for my use, at least it has been. I usually have no more than 3 apps running as notes, reminders ...
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2k views

High CPU temperatue on Macbook Pro Retina Mid 2014

I've recently bought myself a Macbook Pro 13" Retina Mid 2014 model. I went for the cheapest model but upgraded the CPU from 2.6Ghz to 2.8GHz. The specs are: 2.8GHz Dual-core Intel Core i5, Turbo ...
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162 views

How to group cpu cores in Activity Monitor (Mavericks 10.9.2)?

I've got MacBook Pro with 4 cores and Hyper-Threading(HT). I've also got a MacBook Air with two cores and HT. On both devices I've set Activity Monitor to show CPU History (View -> Dock Icon -> Show ...