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.
0
votes
0answers
19 views
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:
...
1
vote
1answer
24 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 ...
1
vote
0answers
17 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 ...
0
votes
1answer
24 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 ...
3
votes
1answer
337 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?
0
votes
1answer
28 views
Application installed in linux is slow [closed]
We are have a test and production Linux server for antimony laundering screening. Both are using Linux RED HAT 4.1.2 .
The test server is a virtual machine with 2 CPUs and the production server is ...
1
vote
1answer
26 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> ...
1
vote
1answer
51 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 ...
0
votes
0answers
9 views
get real time with PikeOS [migrated]
I am trying to get the real time execution of severals routines on pikeOS.
Using p4 cause some problems:
- Getting the time with p4 need at least 300 milliseconds (this is too much) on my board Arm9
...
0
votes
1answer
27 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. ...
0
votes
0answers
56 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] ...
3
votes
3answers
60 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 ...
1
vote
2answers
59 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
votes
0answers
31 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 ...
0
votes
3answers
63 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 ...
5
votes
0answers
70 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 ...
0
votes
0answers
64 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. ...
1
vote
2answers
33 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 ...
1
vote
1answer
37 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.
...
1
vote
3answers
63 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 ...
3
votes
1answer
44 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 ...
3
votes
1answer
104 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
votes
1answer
111 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 ...
0
votes
1answer
43 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 ...
0
votes
1answer
777 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 ...
1
vote
1answer
343 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?
...
3
votes
1answer
39 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 ...
1
vote
0answers
31 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 ...
0
votes
1answer
26 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 ...
0
votes
0answers
20 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 ...
0
votes
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 ...
2
votes
0answers
26 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 ...
1
vote
1answer
50 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, ...
0
votes
0answers
54 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 ...
0
votes
1answer
79 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 ...
0
votes
3answers
77 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 ...
1
vote
0answers
87 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/* ...
5
votes
2answers
141 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 ...
2
votes
0answers
294 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]] ...
0
votes
2answers
59 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 ...
2
votes
1answer
50 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 ...
2
votes
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 ...
0
votes
2answers
92 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 ...
0
votes
1answer
43 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
votes
1answer
44 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 ...
2
votes
2answers
346 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?
3
votes
3answers
79 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 ...
-2
votes
1answer
528 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%
...
1
vote
2answers
88 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 ...
1
vote
4answers
654 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 ...
