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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7answers
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How do I identify which CPU a MacBook uses?

I'd like to identify which CPU this notebook is using, in terms of code names such as "Ivy Bridge" and "Haswell". The little Apple logo in the upper left shows some information, but not this.
4
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4answers
4k views

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 ...
3
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1answer
26 views

Is there any part of OSX that gets a significant speed boost from Intel AES instructions?

I've been comparing some specs between Mac Pro models, specifically with the jump from Harpertown (a.k.a. Core 2) to Gulftown/Westmere (a.k.a. Core i7). While there were expected incremental ...
4
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0answers
53 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 ...
0
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0answers
39 views

High CPU utilization due to Firefox in EL Capitan 10.11.4

Hi I am using Firefox with 10-14 open tabs (AWS console, JIRA, GitLab, etc). I mac hangs due to high CPU utilization by Firefox as per activity monitor. Can someone help me with this. Github Gist ...
1
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1answer
62 views

Optimise use of hardware under Mac + Windows in virtual machine

I use a macbook pro with OS X El Capitan 10.11.4, 2,5 GHz Intel Core i7 and 8 GB 1333 MHz DDR3. I need to code in Visual Studio and use Microsoft Excel for Windows, thus I installed Parallels ...
5
votes
1answer
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 ...
0
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1answer
197 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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1answer
10 views

Change Activity Monitor update speed?

When viewing the CPU Load on Activity Monitor today, I was curious as how to make Activity Monitor update the chart and data faster. Is there a setting to change the update speed for Activity ...
6
votes
1answer
119 views

CPU Die temperatures reaches 90° C, is that normal?

My Macbook Air 13", Mid 2011, got heated and is slow in working. I noticed that CPU Die temperature reaches 90° C, is that normal? I've changed my fan recently but still get this issue.
0
votes
1answer
27 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? ...
1
vote
1answer
71 views

Do Sophos and Spotlight conflict and if so, how can I run both applications without problems?

I just got a brand new 13" MacBook Pro at work. I have noticed that Spotlight has been running constantly giving me ~4 hours of battery life. The motivation for getting this laptop was to have the ...
12
votes
3answers
4k views

CPU usage is too high with Yosemite and an external monitor

I use Yosemite 10.10.4 on my MacBook Pro (2012). I used to work with an external monitor: Apple Thunderbolt 27" monitor. The issue is that, according to Activity Monitor, the kernel_task process ...
1
vote
0answers
51 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 ...
0
votes
0answers
19 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 ...
1
vote
0answers
128 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 ...
1
vote
1answer
279 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 ...
43
votes
6answers
30k views

“powerd” process uses a lot of CPU

Oftentimes, after I wake my Mac from sleep, powerd (which is the power management daemon? Which in particular deals with sleeping the Mac and waking it?) uses high CPU, usually around 25% to 50% on my ...
5
votes
2answers
3k 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 ...
0
votes
1answer
2k views

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.
50
votes
2answers
73k views

mds and mds_stores constantly consuming cpu

mds and mds_stores are constant CPU consumers even when I think nothing should have changed on the hard drive. activity monitor I have a circa 2009 Macbook Pro. Lots of software installed over the ...
3
votes
3answers
9k views

Very high kernel_task CPU usage after updating to Yosemite 10.10.4

I updated to 10.10.4 on July 1, and ever since I've had very high CPU usage - roughly 270%, i.e. two and a half of four processors - by kernel_task. It appears on login for about five minutes, then ...
3
votes
0answers
49 views

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. $ ...
0
votes
2answers
45 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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0answers
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.
2
votes
2answers
1k views

Get cpu usage per core on the command line

Activity monitor allows users to see the cpu usage on a per-core basis (for multicore machines, e.g. my MacBook Pro). Is there a way to find the percent usage of each core/processor via the command ...
1
vote
2answers
83 views

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 ...
1
vote
1answer
251 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 ...
0
votes
1answer
33 views

Memory/CPU usage comparison between two MacBook Pros

I recently switched from a 2014 mid MacBook Pro Retina with 2.7 GHz and 8 GB of RAM to a 3.1 GHz and 16 GB of RAM. I noticed something very strange which is that 1) when I am dong very basic tasks ...
0
votes
1answer
52 views

Mac Pro 4,1 CPU upgrade

I own a Mac Pro 4,1 (single socket) with a Nehalem Quad-Core CPU. I'd like to upgrade it with a six-core Westmere processor. Now, what I have to do prior to installation of the Westmere processor? ...
2
votes
2answers
192 views

Check if G5 is a SMP one?

How do I check if a G5 PPC mac has 2 CPUs or not? When booting it up under Linux (Debian 8) only one CPU seems to be detected: cat /proc/cpuinfo processor : 0 cpu : PPC970FX, altivec ...
0
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1answer
34 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 ...
9
votes
1answer
19k views

VTDecoderXPCService taking CPU

Sometimes I notice CPU load for no reason and I see in Activity Monitor that VTDecoderXPCService is using 15-30% of CPU. After I restart Safari it is ok for some time until it happens again. Any ...
0
votes
0answers
28 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 ...
1
vote
1answer
916 views

My CPU is running slow after a system restore (4x0.8 GHz). Turbo Boost is definitely not working. And how can I fix it?

Last weekend, my Macbok Air suffered a heart attack and I ended up doing several hard shutdowns due to an unresponsive system. In the end I had to do a full system restoration. Everything is working ...
0
votes
0answers
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 ...
0
votes
1answer
100 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) ...
15
votes
7answers
14k views

High CPU time of Finder in El Capitan

I have extremely high CPU time for Finder use after updating to El Capitan version 10.11.0 I've tried: Rebooting the Mac Resetting SMC Resetting NVRAM The machine is borderline unusable with ...
1
vote
1answer
132 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) ...
3
votes
0answers
161 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 ...
0
votes
2answers
686 views

What is “usernoted” and why is it eating my CPU?

For the past couple of weeks, a process identified as usernoted appeared to "take over" my machine after a few hours of use, eating over 99% of available CPU. Force quitting the process doesn't help; ...
0
votes
2answers
19 views

Is a “2 GHz Intel Core Duo” really the same as a “2 GHz Intel Core ***2*** Duo”

I'm trying to get Sling TV set up on an older iMac. It has 10.6 (the minimum required OS), 2.5 GB RAM (~2.5 times the required memory), and a 2 GHz Intel Core 2 Duo. However, the Sling TV web ...
1
vote
2answers
10k views

mdworker process always at 100%, even when not indexing

I'm trying to understand why mdworker is always at 100% even when (apparently) not indexing. If I open Spotlight, there's no message telling me that a drive is being indexed. If I run fs_usage -w -f ...
2
votes
2answers
1k views

Macbook Pro 15“ vs 13” - Performance vs portability

Currently I've got a MacBook Pro 15" (mid-2010, model 6,2), with 8 GB RAM, 2,5 GHz i5 Processor and Intel HD Graphics 288 MB video card. Seeing as it's 5+ years old, I really need a new one, ...
0
votes
0answers
170 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 ...
12
votes
3answers
28k views

View the current clock Speed of a CPU in OS X?

Does anyone know of a utility to see the current speed of the processor? To be clear, I'm not looking for the model/speed of the CPU, but rather what the CPU is currently clocked at (i.e. it will ...
0
votes
1answer
444 views

Brand new MacBook Pro flagship behaving strangely

Today i got the newest available MacBook Pro flagship model. After setting up some basics, installing Photoshop, JRE, XAMPP and NetBeans, i started to use the machine a bit, doing some basic coding. ...
0
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0answers
137 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 ...
16
votes
6answers
27k views

Why is the accountsd process eating so much CPU?

Why are the accountsd and securityd processes using so much CPU on OS X 10.10.3? I am on a Early 2011 Macbook Pro. What are these processes for? Is it safe to kill them? The machine has only been up ...