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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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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How can i retrieve the following attributes in linux? [on hold]

Reads (transfers per second ) between system memory and user memory writes (transfers per second) between system memory and user memory Number of system calls of all types per second Number of ...
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38 views

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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10 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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21 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
31 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. ...
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3answers
53 views

Type and the speed of CPU using the lscpu command

I want to determine the type and speed of my CPU so I executed the CPU command, However, I have some confusion, so from my output I can't really determine what is my CPU type and my speed is 1600 ...
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1answer
22 views

How to sort ps output to find processes realtime priority and identify processess currently occupied running queue

How to properly identify real-time processes currently occupied CPU queue and count them using ps? I know there is a bunch of fileds like prio,rtprio,pri,nice but do not know correct to use. It seems ...
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1answer
50 views

Understanding the output of /proc/cpuinfo

I have a LeMaker HiKey development board. I purchased it for testing a couple of libraries on ARM64 cpu architecture. The board provides two Cortex-A53 processors, provides eight cores, and uses ...
3
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1answer
87 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
38 views

List the CPU utilizations for each screen

How can I list all screens launched with screen along with their CPU utilizations? (screen -ls gives the lists of screens but not their CPU utilization) By CPU utilization of a screen, I mean the sum ...
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1answer
240 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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1answer
98 views

“rcu_preempt detected stalls on CPUs / tasks” message appears to continue

My board continues to display the message below. The terminal does not have any input. What is it with the following message, which I know? (T, g, c, q ...) What is the cause of this phenomenon? ...
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1answer
36 views

How to distinguish between v2 and v3 of Xeon processors?

I'm trying to determine what processor my server is running. I tried looking at /proc/cpuinfo, using lshw and dmidecode. In all of them I get: Intel(R) Xeon(R) CPU E31220 @ 3.10GHz How do I ...
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23 views

Process scheduling and core allocation on big.LITTLE CPUs

Recent ARM chips, like the Qualcomm Snapdragon 810, seem to be using a hybrid architecture called "big.LITTLE" with cores of different architectures and speeds combined into one CPU. On a Linux (or ...
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1answer
25 views

Weird cpu-load pattern

I am facing a strange (and rather annoying) problem with my laptop set-up: dual boot "Windows 10" and "Linux Deepin 14.2 (based on ubuntu)" problem: starting up with linux at the beginning ...
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16 views

High CPU usage after Version Upgrade

Not sure if is related to the version upgrade but since I have updated my Raspberry to Linux version 4.1.13+ (dc4@dc4-XPS13-9333) (gcc version 4.8.3 20140303 (prerelease) (crosstool-NG ...
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1answer
18 views

generate key for licensing purposes

I am interested to know if there is a way to allow a user of a web application to log in the application in the following way: 1) Generate a unique key (for licensing purposes) based on unique ...
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21 views

Assign virtual core number to specific real core

Is there any way to assign ''linux core numbers'' to specific real cores? I'm working with an asymmetric architecture, so not all cores are the same, and I want to assign specific cores number to ...
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1answer
35 views

Taskset does not Work Properly

When I type the command top The first row of the output is 29646 Usernam+ 20 0 7041320 1.047g 105604 S 1267 0.6 256:11.86 MATLAB As you can see, the CPU utilization is 1267%. That means, ...
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38 views

SNMP Temperature with lm sensor

I have just managed to put in SNMP the lm sensor output. However, I have an alarm due to a fake threshold of Temperature SYSTIN (see output) nct6776-isa-0290 Adapter: ISA adapter Vcore: +1.02 ...
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1answer
55 views

How to install dia on my debian8 64 cpu?

dpkg --add-architecture i386 root@hws:/home/debian8# dpkg -i /home/debian8/Downloads/dia_0.97.2-5_i386.deb Selecting previously unselected package dia. (Reading database ... 87794 files and ...
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3answers
70 views

CPU > 80% - how can I debug?

I am running a laravel application on a Ubuntu 14.04 digital ocean vps and I am using New Relic to monitor the server. I got an email alert that my CPU usage was above 80%. I logged in to New Relic ...
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58 views

Can rsync command run using multiple cpu?

I executed this command but it took long time when checking checksum. Load average was 1.00 at all times. Can rsync command run using multiple cpu? $ rsync --checksum -av -e ssh /usr/local/xxx/* ...
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133 views

Under what circumstances, if any, will the result of reading /proc/cpuinfo change?

What I understand so far is that when a program opens and reads any file under /proc/, the kernel will generate the information on the fly. In the specific case of cpuinfo most of that data is ...
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235 views

CPU Pipe Underrun Errors

Every time upon booting and then unlocking my GUI session on Kali Linux 2.0, I get another of this error in Virtual Console 1: [ 1235.586792] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] ...
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52 views

How to launch i7z_GUI?

I tried many ways to launch an application i7z_GUI on Debian, but it just won't start. I tried it both as root as shown below and as a user. su-to-root -X -c /usr/sbin/i7z_GUI gksu -u root ...
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1answer
43 views

how to get processor that thread is currently assigned to?

I've found such column in ps -elF: PSR processor that process is currently assigned to. I need something similar but for threads. ps huH p 1234 prints threads of process 1234, can I somehow add ...
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2answers
27 views

What tools can I use to diagnose the exact reason for laptop slowness? And how do I use those tools?

I am running Linux Mint 17 on my laptop. When using applications (mainly Web Browsers) the machine freezes for little time periods. The CPU indicates 100% usage at such times, but this only seems to ...
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2answers
67 views

Get cpu usage average for the last 5 seconds

I am trying to find an alternative to this command: mpstat 5 1 Even though it works as i need, but it have a delay of 5 seconds, i need something similar, but that will give me instantly the CPU ...
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1answer
41 views

Hardware specs for Linux machine for cluster administration [closed]

I have just started as cluster system administrator and was asked to choose some features to get bought a personal machine to work on, and most intensive calculations will be perform in the cluster. I ...
2
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1answer
40 views

What is the difference between opening an application from terminal Vs directly opening it?

I could open Firefox browser either by clicking FF icon on desktop or by running ~/firefox/firefox & in the terminal. What are the differences in these two ways of running? I am wondering because ...
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199 views

how to find out intel architecture family from command line

I get access to some xeon machines for checking performance. I want to find out what architecture they are using such as Haswell, Sandybridge , Ivybridge. Is there a command to find this out?
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3answers
76 views

Rebuild original file from diff files to save disk space

Every day 10GB text file is downloaded, the file is ~200 million lines and ~1% of the lines are changed the next day. I want to keep daily files as backup, but I'm trying to save disk space by using ...
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1answer
318 views

script to check cpu utilization in linux

I want a bash script that show the CPU consumption every minute and save it in a file. The output would be like this: 11/09/2015 10:00: CPU: 60% 11/09/2015 10:01: CPU: 72% 11/09/2015 10:02: CPU: 32% ...
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75 views

Optimal BIOS CPU power config for performant Hadoop?

I'm in the process of setting up a Hadoop cluster and have so far been unable to find a good answer for how to configure CPU power in the BIOS for Linux. My BIOS give a variety of options with ...
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4answers
518 views

Number of CPU cores versus frequency of cores in Qemu/Virtualbox

I plan to build a workstation mainly for running virtual machines. There will be dozens of virtual machines and they do not execute computationally expensive tasks. I will use mainly Qemu(with KVM ...
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1answer
41 views

Is there a brief way to view the top resource usage(CPU, memory or even bandwidth) of a program after its running?

I know I can use top to view the overall real-time CPU & Memory usage, and nload for overall real-time bandwidth usage. But I wish to view the maximum(or average) CPU, Memory, & bandwidth ...
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1answer
167 views

Kernel panic – not syncing: Fatal machine check on current CPU

In the latest few weeks, my machine rebooted a few times with this kernel panic error. It's a fedora 21, Linux 4 machine on an AMD E-350 APU. I didn't observe any pattern. When I reboot, the BIOS ...
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160 views

Kernel - Measuring the rate of timer interrupts

I am working on optimizing kernels of my boxes for telephony, which involves (among other things) adjusting the HZ rate and the preemption model. Initially the kernel was compiled with the default ...
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1answer
26 views

Use NVIDIA graphic card as regular resource

I don't use my graphic card anymore, but it is still laying there, idle. Is there a way I can turn it back on and use it just a regular, additional CPU/RAM for my laptop?
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25 views

how practical the number of cores in Android

I've often wondered how practical the cores usage in Android smartphone. I'm asking here because Android is based on Linux. I'm looking from technical perspective. The articles that I've read so far ...
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3answers
197 views

Store CPU utilization into CSV file

OS: Debian 8 x64 I'd like to log every 5 seconds the CPU percentage into a CSV file in the format below: YYYY-MM-DD HH:MM:SS,CPU% I'm not familiar with how to use the top program to calculate the ...
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65 views

Change system properties(name) under linux

Sorry for the title if is not clear. What I wondering can I change somehow under linux( ubuntu / redhat ) the name of processor like in windows by registry edition? What I mean is currently when I ...
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2answers
823 views

Why I can not use all the 100% potential of CPU?

I am using my computer clusters to run a MD C program but I can not use full potential of those clusters. But the this node have 16 CPUs and I also only give 15 jobs for those CPUs. But I can not ...
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116 views

Difference between two linux machines

I have two machines and I am trying to see which one is more powerful machines. I can check memory and cpu but not sure how to understand other things from lscpu: Here is machineA "lscpu" result: ...
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1answer
21 views

Relationship between Interface Speed and Processing times

I have a question regarding processing time delays. I want to know: is there a relationship between the rate of data packets received and their processing time at the receiving host, or is the ...
2
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1answer
59 views

Set CPU affinity for the specific program?

How can I set CPU affinity for the specific program (say gzip) to always run on specific core or cores (core 1, for example)? I read about taskset, but can it be used before program is actually used ...
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1answer
61 views

Threads vs interrupts

What does it mean when threads are time-sliced? Does that mean they work as interrupts, don't exit while routine is not finished? Or it executes one instruction from one thread then one instruction ...
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4answers
3k 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: ...