The CPU (Central Processing Unit), is the chip in the computer that actually performs the operations and calculations that are done as a program runs. It is essentially what executes a program.

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Occur Hardware Error when using Matlab in Fedora20

I often found the following problem when I using Matlab 2012 in Fedora 20, during or after fft calculation or plot figures. The following is the error massage: [ 635.157606] mce: [Hardware Error]: ...
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What is the meaning of Tasks and Running in htop screen?

On my computer it shows Tasks 314; 24 running What do these numbers mean? Is 1 Task = 1 process? Why isn't the number of running tasks = number of CPUs then? (I have more than 24 CPUs) edit. ...
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33 views

How does the kernel assign cpu ids to physical cores?

One may find a lot of info about how to inspect physical cores layout in a running linux system, but I'm wondering how the physical cores are assigned a cpu id in the first place. After experiencing ...
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1answer
17 views

Control fans of Samsung NP900X3E

I have a Samsung NP900X3E laptop and I would like to control the fans as one of them is making weird noise. I'm running Ubuntu 14.04.4 LTS with "Linux laptop 3.13.0-85-generic #129-Ubuntu SMP Thu Mar ...
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1answer
99 views

Why does my cpu never get past 60-70% cpu usage? Where is the bottleneck?

In my CPU graph thingy, I have noticed recently that when compiling stuff I can never seem to reach 100% usage, it just keeps bobbing up and down around 60-70% max. Example: In contrast, this graph ...
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22 views

Archlinux laptop overheating

I have a Samsung laptop and installed Archlinux on it. At first everything was fine, I was even surprised at how nice everything was, no driver problems, everything went smooth. I could watch videos ...
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6answers
12k views

How to know number of cores of a system in Linux?

I wanted to find out how many cores my system has. So I searched the same question in google. I got some commands such as: $ lscpu command. When I tried this command, it gave me the following result: ...
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8answers
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cron Vs. sleep - which is the better one in terms of efficient cpu/memory utilization?

The Case: I need to run some commands/script at certain intervals of time and for this I have two options - 1. set up a cron-job or, 2. implement a loop with sleep in the script itself. Question: ...
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4answers
6k views

kswapd0 takes 99% to 100% CPU in RHEL 6.3

I have 5 systems on which I have just installed RHEL6. System configuration is CPU-i7 HDD-500 GB RAM-2 GB Swap- 4 GB I have installed the same software's and all the configuration as per ...
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2answers
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Can someone please explain the relation of CPU bottleneck on AIX regarding lcpu and r?

# vmstat 60 2 System configuration: lcpu=12 mem=46080MB ent=1.10 kthr memory page faults cpu ----- ----------- ------------------------ ...
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2answers
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Keep CPU busy at certain percent (to prevent CPU buzzing frequency noises) [closed]

On Dell Inspiron 7559 there is electric buzzing from beneath the keyboard that changes frequency when I touch the touchpad. However, if the CPU is busy I hear no buzzing as the frequency gets out of ...
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Linux:how java applications having 1000 threads are managed by 2 CPU's os?

Linux: 2CPU's, 16gb ram Let's say, for example, tomcat having 1000 threads. How this application threads will be shared between two CPU's, and what is the value of run queue length? In my case when ...
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5answers
4k views

Understanding top and load average

I'm observing a high load average on a certain machine (about 9) in all three load fields. I understand load as the number of processes in state "run" / currently desiring CPU time. Am I correct at ...
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0answers
19 views

Linux: Relation between run queue length and load average [duplicate]

Is there any relation between run queue length and load average?. references appreciated
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1answer
2k views

Debian jessie boot hangs at “Started Update UTMP about System Runlevel Changes.”

I just upgraded my MOBO and CPU on my PC, and now whenever I try and boot my debian install it hangs at [ OK ] Started Update UTMP about System Runlevel Changes. Is there an way I can boot into my ...
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0answers
18 views

What happens when an application is started with the Linux OS [closed]

Assuming os:Linux with 14gb ram, 2 CPU's with 2.50GHz scenarios after launching how many processes will be created and where? if application wants's create 1000 threads, then who will create what ...
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1answer
971 views

Linux Mint CPU cores balancing and high temperature

I am using Linux Mint. My laptop has a Core i5 CPU. When I check the system monitor, it shows that the CPU 1 usage is between 90 to 100% and CPU 2,3,4 are less than 5%. Why doesn't it balance ...
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1answer
19 views

How to add a virtual core to Linux system

Here a virtual core means another CPU core that does not exist physically but can exist just as another core and can be assigned processes naturally by the system. Is it even possible to do this? ...
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1answer
42 views

Process running in only one processor

I have a 40 v core machine in which a java process running. I can see that this process is running in cpu6 all the time. $watch ps -o pid,psr,comm -p 4076 Every 2.0s: ps -o pid,psr,comm -p 4076 ...
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1answer
878 views

Elementary OS Gala using more than 100% CPU constantly

I am using ElementaryOS with the default Drivers and my Gala process is constantly using tons of CPU (sometimes more than 200%). I have looked everywhere but couldnt find a solution. I tried to ...
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2answers
152 views

Supervisord at 99% cpu usage

I've installed supervisord using: sudo apt-get install supervisor on my Ubuntu 14.04 server as per the instructions in the Laravel documentation. I've noticed that the supervisorctl process on my ...
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1answer
9k views

diabling cpu cores on quad core processor on linux

I want to disable 3 CPU cores and run my processor on a single core. I have used command:maxcpus=1. But after this I executed this command ls /sys/devices/system/cpu. It still shows ...
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0answers
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top command shows dnss running at 290%

We're running software on a CentOS 6.2 virtual machine and it's been crashing quite a lot lately and keeps running slow. I checked the RAM usage, but that's only using 4GB to 5GB of the available ...
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1answer
24 views

How to limit coredump CPU usage?

I have some process (test) which runs on my machine. Sometimes it crashes and a core dump is generated. Whilst the core dump is being written, the machine is completely frozen (even the mouse pointer ...
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1answer
2k views

Intel Turbo Boost apparently activated for no reason?

The other day, I reinstalled my operating system (Crunchbang, fork of Debian). For some reason my fan has been running at full speed (and blowing colder-than-room-temperature air) even though I'm ...
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1answer
43 views

Why is 64bit Ubuntu running Slower? [closed]

I have 2 mostly identical machines, and Acer and a Lenovo, both with Intel Atom 230 CPU @ 1.60GHz and 1GB of DDR2 RAM. The acer has a fresh install of 64Bit Ubuntu 14.04 LTS while the Lenovo has the ...
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3answers
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How can I start a process using cpulimit?

I am trying to use cpulimit for testing an app I'm developing under low resource conditions, and I need the process to start under the influence of cpulimit. It is not sufficient to start the program ...
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0answers
43 views

What do the benchmarks in HardInfo mean?

The program hardinfo is included by default with Lubuntu as a system profiler. It can run 6 different types of benchmarks: -CPU Blowfish -CPU Cryptohash -CPU Fibonacci -CPU N-Queens -FPU FFT ...
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1answer
30 views

Is there any command that limits the use of cpu resources by percentage?

So far I've been using nice -n 10, but that's just sets the priority of the command I want to run low, but if there's no other process running at that time the command will take all the remaining cpu ...
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0answers
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Gnome 3 on openSuse 42.1: Seemingly Random Commands Causing High CPU Usage

I am experiencing intense cycles of high CPU usage on my openSuse laptop. I have noticed my browser intermittently freezing up (and my fan speeding up) and I checked htop and this is what it looks ...
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4answers
6k views

How can I receive top-like CPU statistics from the shell?

I'm trying to get an accurate read of my used CPU (in percent) from top. This is the command I'm running for testing: top -n1 | awk '/Cpu\(s\):/ {print $2}' This returns: 10.7%us, Which is the ...
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0answers
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using cpu.cfs_quota_us and cpu.cfs_period_us to limit CPU usage

There are 32 cores in a system (2 cpus each 16 cores) and I want to limit a user to use only 4 cores (100% usage for that 4 cores). There are two kernel parameter for that according to the manuals: ...
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1answer
41 views

Understanding the top command output on an ARM multicore computer

Ran the top command to check CPU performances and memory usage on the New RPi3 while running a browser. Since we have a 4× ARM Cortex-A53, 1.2GHz, how should I read the result? $ top Mem: 327132K ...
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22 views

Surge CP overload but low CPU usage. Got log in issue on web application when it happens. why?

I am unable to login to solaris server via GUI mode. We have checked and found that the DB/oracle session was hung up. GUI was not able to connect to Oracle DB . After clearing the hung counters from ...
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1answer
30 views

`cpulimit` and `nice` not effective in limiting the cpu usage of a python program that contains heavvy computations using theano

I am running a program written in python that makes heavy computations using theano. As it is a very CPU-intensive program, it is disrupting all my other activies on my laptop. For this reason I ...
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1answer
355 views

Does Linux typically log system temperature data?

Do mainstream Linux distributions typically log system temperature data, e.g. CPU or HDD temperature? If so, where can those logs be found?
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1answer
35 views

Dedicated CPU allocation to zone in Solaris 11

I have created a zone called web in Solaris 11. Now I want to allocate one dedicated CPU resource to that zone. But it's throwing an error: "No such entry". I did the following... zonecfg:web> ...
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1answer
63 views

Does Powersave Mode on the CPU help at all to save power?

I use indicator-cpufreq with Cinnamon to control my CPU-usage and save power, as my battery life has been running low. So, I use indicator-cpufreq to put my CPU in powersave mode. However, I have this ...
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0answers
65 views

dynadock - Crashes unexpectedly with “Fixing recursive fault but reboot is needed”

Whenever connected to my dynadock, my notebook (Linux Mint running Ubuntu 14.04.1) has crashed unexpectedly with: And if I press Ctrl+Alt+F8: [drm:intel_set_cpu_fifo_underrun_reporting [i915] ...
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1answer
36 views

Excessive CPU usage while running Facebook and few other websites

I am running Linux Mint 17 (Linux Kernel 3.13.0-71-generic) on my HP Envy 17j (Core i7, Quad core). The laptop runs normal while using any programs. But when I open facebook.com or similar sites (e.g. ...
103
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4answers
59k views

What do the flags in /proc/cpuinfo mean?

How can I tell whether my processor has a particular feature? (64-bit instruction set, hardware-assisted virtualization, cryptographic accelerators, etc.) I know that the file /proc/cpuinfo contains ...
3
votes
3answers
71 views

What is the correct way to view your CPU speed on Linux?

I found two commands to output information about my CPU: cat /proc/cpuinfo and lscpu. /proc/cpuinfo shows that my CPU speed is 2.1 Ghz, whereas lspcu says it is 3167 Mhz. Which one is correct? This ...
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2answers
90 views

what means 'processor execution level'?

I'm reading about Unix in a book "The design of UNIX operating system". But, in the text middle of process state (e.g wakeup, interrupt), there is term 'raise processor execution level'. What does ...
2
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0answers
33 views

Suspend system instead of shutdown on CPU overheat

I have Linux Mint. The system Linux Mint is installed on, shuts down immediately on overheating. Is there anyway the system doesn't shutdown, but goes to standby state? The machine can always be ...
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3answers
75 views

Linux + how to verify the CPU performance

I have few servers that I manage in my origination ( red-hat 5 ) my users complain about the bad CPU performance grep processor /proc/cpuinfo processor : 0 processor : 1 can I ...
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0answers
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FreeBSD throttle cpu clock on high temperature

I'm using a laptop with bad cooling system, so my CPU sometimes hits very high temperature, and linux kernel is able to throttle cpu clock to cool it as I can see in dmesg: [22612.245243] CPU3: Core ...
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4answers
8k views

32-bit, 64-bit CPU op-mode on Linux

I'm confused. Running Fedora Linux, lscpu yields: Architecture: i686 CPU op-mode(s): 32-bit, 64-bit ... But when I try to install a 64-bit program (Chrome) I get error like: ...
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148 views

upowerd consuming 100% cpu

upowerd is consuming nearly 100% of CPU. I am currently affected by this issue on both a Lenovo Thinkpad E520 and on a desktop PC running Core i7 and Asus Z170a motherboard. Both run Kubuntu 15.10. ...
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2answers
57 views

Can a single core of a cpu process more than one process?

This is the reasoning for my question is what I read in a text book which states: Each CPU (or core) can be working on one process at a time. I'm assuming that this used to be accurate but is no ...
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1answer
40 views

What is the power dissipation of the CPU and how does it work?

I'm looking into TLP and there is this setting that I don't know what does it do: # Set Intel P-state performance: 0..100 (%) # Limit the max/min P-state to control the power dissipation of the CPU. ...