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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2answers
907 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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48 views

Many strange issues with 2009 Macbook Pro running 10.10.5

my wifes macbook pro started acting very strange this evening, and i can't seem to figure out what is wrong with it at all. here is a list of various issues that all seemingly started tonight: ...
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2k views

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
75 views

Is it normal for there to be a 5min+ period of high CPU usage when going to sleep under El Capitan?

I have recently upgraded my 8GB MacBook Pro (mid 2010, model ID: MacBookPro6,2) from OS X 10.6.8 to 10.11.4. Under Snow Leopard, after I closed the lid it would take something like 30 seconds to ...
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81 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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119 views

High CPU utilization due to Firefox in El Capitan 10.11.4

I am using Firefox with 10-14 open tabs (AWS console, JIRA, GitLab, etc).My Mac hangs due to high CPU utilization by Firefox as per Activity Monitor. Can someone help me with this. Github Gist link ...
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1answer
435 views

Why does VTEncoderXPCService take up all my cpu?

2010 Macbook Pro. Pretty frequently, my mac will spend over 100% cpu on VTEncoderXPCService. It causes the fan to spin up and it causes the computer to get hot. ps -ef | grep -i vtencoder shows ...
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300 views

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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1answer
158 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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1answer
390 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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1answer
82 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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20 views

Free software that monitor CPU temperature under El Capitan?

Is there some free software that can show CPU temperature in real time for OS X El Capitan? Any way to have CPU temperature in the menu bar? doesn't provide such an option.
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1answer
36 views

What maximum OpenGL context do the Macbook Pro's support on Bootcamp Windows

I'm Looking to get MacBook Pro. Is there a max OpenGL context? I understand that on OS X it is 4.1, does this change when booting in Windows, and is this diferrent or the same for the three models? ...
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1answer
37 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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1answer
105 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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1answer
31 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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320 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
166 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
204 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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194 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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CLI: get CPU real speed (e.g. Intel SpeedStepping)

Can you query for the real CPU speed in OS X command line/terminal? $ system_processor – only provides the hardware spec info. $ sysctl hw.cpufrequency – only provides the hardware spec info. $ ...
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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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222 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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123 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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55 views

Why a sudden increase in CPU when battery low?

My Macbook Pro (Retina 13" late 2013, OSX 10.10.5) has fine battery life overall - this is not the problem. However, when the battery drops below about 8%, and before I normally get any "your ...
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198 views

maspushagent using CPU

[retina MacBook Pro 15", Late 2013, OS X 10.11.4] I always keep Activity Monitor running, and just noticed that CPU usage was up significantly. The process maspushagent (owned by me) has now been ...
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20 views

Mac Pro Tower, 1 or 2 CPUs

I'd like to know whether a 4,1/5,1 Mac Pro with dual processor board can actually work with just one CPU installed.
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511 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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140 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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51 views

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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93 views

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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464 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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0answers
1k views

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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22 views

Can malware be the source or 600% load on 8-core i7 processor with nothing in Activity Monitor nor `top`?

My Mac suddenly started showing a heavy processor load, i.e. 600% or more. When I checked in iStat Menus, Activity Monitor and sudo top, no process was shown to consume more than 10%. Should I worry ...
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48 views

OSX10.11: Completely Disable Spotlight

Spotlight is driving me crazy. It has a constant CPU usage of 100-200% making my laptop run hot and reducing my battery life to half of what it used to be. This is my development machine and I can ...
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20 views

Limiting Mac Pro (late 2013) power draw

I'm planning to buy a trashcan mac pro, but I have strict limits about power draw. Is there any trick to limit cpu frequency? You can do so quite easily, for example, in windows and linux. Limiting ...
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29 views

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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23 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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204 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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149 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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0answers
122 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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103 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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153 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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207 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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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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165 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 ...