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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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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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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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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14 views

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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163 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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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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204 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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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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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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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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653 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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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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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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1answer
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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186 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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“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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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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124 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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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
149 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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How many cores does a Mid 2012 Macbook Air have?

I checked the specs, and the i5-3427U CPU has 2 cores. But the Activity Monitor shows 4 little charts for the CPU, so it looks like 4 cores. Which is correct? Why does the Activity Monitor have 4 ...
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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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2answers
656 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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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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68 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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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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1answer
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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75 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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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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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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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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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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128 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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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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4answers
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MacBook Pro CPU temperature is over 90 degrees while playing video

I have MacBook Pro: 13-inch, Late 2011 2.4 GHz Intel Core i5 4 GB 1333 MHz DDR3 Intel HD Graphics 3000 384MB OS X Lion 10.7.4 When it plays a video, the CPU temperature goes over 90 ...
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How does Parallels' CPU and ram usage work? When to shutdown virtual machine?

I run Windows 7 using Parallels in host operating system OSX. I have it configured to use 2GM ram and 2 cores on a Retina MacBook Pro with 8GB ram. I'm curious under what conditions I will experience ...
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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
971 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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3answers
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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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699 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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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 ...
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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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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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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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781 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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122 views

Emulating lower speed CPUs on Mac mini

I would like to ask whether it is possible to develop OS X application (especially for Lion) on a Mac mini, being able to test how the performance would be on a lower speed CPU. For example: ...
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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 ...
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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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157 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 ...