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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Are CPU temperatures over 110 something to worry about? [duplicate]

I am primarily a Java developer and love using OS X and Mac as my primary development environment. However recently I have been having temperature and heat concerns. I have a piece of code that ...
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Low Battery Performance - Activity Monitor Shows Faults in CPU statistics

My Macbook battery (I guess batteries is the more correct term in this new Macbook) isn't getting battery life as estimated by specs, and it is already lessened in only about 2 months. Today, I ran a ...
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Background processes periodically eat up my CPU time on OS X 10.10.4, Yosemite

Periodically the CPU on my iMac Mid-2015 running OS X 10.10.4, gets used almost exclusively by: launchd: ~70% fseventsd: 12% UserEventAgent: ~40% opendirectoryd: 20% notifyd: 12% I have tried ...
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203 views

Safari on OS X Yosemite 10.10.4 CPU problem

Since a couple of days I have problems with the CPU usage of my Safari installation. It runs on OS X Yosemite 10.10.4 (MacBook Pro 13" from 2011). To reproduce it I only have to open one empty tab ...
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161 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.
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MacBook Prop kernel_task uses excessive CPU when the environment is hot [duplicate]

From other posts it looks like having the kernel_task using a lot of CPU is a common issue. However what happens in my case is that the kernel_task starts using a lot of CPU (up to 2000%) only when ...
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86 views

MacBook Air at 5700 RPM fan speed during summer?

it is unusually hot today (37 Celsius, about 100 Fahrenheit) and my MBA mid 13 fan is going crazy. The CPU temp is at 47.5 when almost idle but my fan blows with 5703 RPM (pretty much the maximum). ...
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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 ...
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185 views

Does the Apple Watch have more processing power than a Cray 2 Supercomputer?

I remember growing up in the 80's and my parents would be astounded that the Commodores and Apple II's of the time would be as powerful as a computer that used to take up a room. (I didn't quite get ...
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2k 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 ...
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31 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

Apple Thunderbolt or HDMI for external monitor

Is there anybody who can answer me this question? I have a Macbook Pro Retina 15" quad i7 etc and I use some programs/applications wich need a lot of cpu and also the macbook heats up like hell. I ...
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2answers
93 views

How to upgrade Mac Pro firmware?

So I'm buying a used Mac Pro 1.1 next month. It has an original dual Intel Xenon dual-core CPUs, and I'm aiming to upgrade it to Intel Xenon X5355s and I already bought them. I've read a lot about it ...
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1answer
55 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
147 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. ...
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651 views

Report Crash ~350% CPU Yosemite

10.10.3 There is a process, I do not know how its started and what it starts, which uses ~350% of the CPU. Its performed by 'root'. When I quit it from the activity monitor it comes back straight ...
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67 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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44 views

4SNS TCBC - Which Mac Pro sensor is that?

Briefly my Mac Pro (4,1 Early 2009 ) stopped booting which I eventually traced to the plastic clip holding the north bridge down failing. Seems to be a common issue. Replaced the clips and now it ...
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158 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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5answers
11k 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 ...
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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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125 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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2answers
652 views

kernel_task hundreds of % CPU yet cpu frequency is being lowered

I'm trying to solve the mystery of a crazy high cpu usage on kernel_task. MacBook Pro (Retina, Mid 2012), 2.7 GHz Intel Core i7, Yosemite 10.10.2 I saw some advice to download the Intel Power ...
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3k views

Why is “Spotlight Web Content” using so much VRAM and CPU?

Why is “Spotlight Web Content” using so much (32.56 GB) virtual RAM and CPU (up to 122.41% apparently)? More interestingly, how can I prevent it from doing so? I am running this MacBook Pro with 4GB ...
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How to view CPU clock rate in GHz or MHz?

I am looking to get the new 12″ MacBook and as a result I would like to know the clock speed (in GHz) my current MacBook Air (late 2010) is running at so I know the processor on the MacBook will cope. ...
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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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12k 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 ...
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75 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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4k 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 ...
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2answers
969 views

Any way to have CPU temperature in the menu bar?

I tried SMC fan control and Temperature Monitor but it does not update the temperature and I do not wish to change the fan speed.
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1answer
698 views

Processor affinity on mac.

In Linux machines, there is a command called taskset, which can be used to do the processor affinity. In mac(from mavericks) are there any commands to the same job like taskset? Else how one can ...
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1answer
101 views

can utilising the cpu fully (400% for dual-core hyper-threading cpu) damage mbp

I have recently bought a rMBP with i7 4578U intel 4th generation cpu. iStat usually shows cpu temperature readings of ~50 degrees which is normal. Today, because of a buggy library code, my cpu had ...
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124 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
73 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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4answers
780 views

Is there a way to show each CPU's load separately?

I'm seeking an equivalent of a common Linux based process monitor, which shows a history graph for each CPU core. This can help identify programs that are effectively using all the cores (here, ...
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3answers
4k views

Upgrade to Yosemite: kextd close to 95% CPU

I just gave in to the App Store's constant nagging about upgrading to Yosemite. Aside from an unhappy Chrome, there is this kextd process that's constantly running close to 95% CPU. This results in ...
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1answer
127 views

steps to get a Mac to report CPU and memory load via SNMP?

My group runs a bunch of Mac Pros and xServes of various flavors, and being a fairly recent hire, I am getting up to speed on how to monitor them properly. We use SolarWinds NPM and SAM, and monitor ...
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208 views

Mountain Lion — Finder always freezing

I'm on 10.8.2. Finder always freezes. I have way more CPU and memory than this OS needs. It's only Finder. CPU usage spikes, spinning beachball, the whole thing. I cleared all my caches, disabled ...
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3answers
3k 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 ...
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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 ...
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1k 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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1answer
12k views

nsurlstoraged and CPU usage

Since yesterday nsurlstoraged is constantly using a huge amount of CPU. Nothing shows up in the logs but opensnoop shows that the process is accessing ...
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0answers
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Anyone with Mac Pro, please help with CPU question! [closed]

I'm about to buy a Mac Pro, possibly an iMac instead, in a few days for extensive 3D and video work. I was able to try an online CPU stress test which renders complex video frames on the iMac but I ...
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1answer
2k views

very frequent CPU usage 100% for systemstats

I have macbook retina pro 2013 version with 16gb ram and OS X 10.9.3. This machine works just fine, except just one problem. systemstats hits 100% CPU usage very frequently, at least 6 times a day. ...
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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 ...
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2answers
4k views

iTunes now takes up 100% of CPU since updating to 11.3

UPDATE: The issue seems to be at least related to what konqui mentioned in the Comments since I do have a large library of podcasts. However, if this was merely related to re-indexing then one would ...
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1answer
16k views

Why does Google Chrome Helper spike my CPU?

This has been happening on and off since I switched to a mac at work. Google Chome Helper occasionally runs my cpu into the red and has the fan spinning madly. Sometimes restarting Chrome fixes the ...
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1answer
80 views

Does anyone know of an alternative to CPULED that is not connected to the AppStore?

Just want something similar (UI/ease of use) that is a freeware. :) I can make a copy of the app that is installed in Applications but when I install it in another Mac, it wants me to login to the ...
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1answer
300 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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2answers
613 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 ...