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  1. #1
    Join Date
    Jun 2005
    Location
    Montreal, Que, Canada
    Posts
    5,166

    How can I tell that Fedora is using more than one core of my 4 core cpu?

    I am using Gnome, and it has an interesting extension named "Freon". Freon shows a great amount of thermal information about your system.

    In that regard, most of the time my desktop quadcore cpu idles around 45C. I got to pondering about Linux's task scheduling. I tried to find a way to discover if some Linux tasks are using the other three cores. Its not apparent to me that Fedora is multi-processor oriented during the boot process, or when performing I/O.

    Around 2012, I wrote some file encryption programs using DES3. (Triple DES). I set up a shell script to encrypt and decrypt a large file. Encryption an decryption is very cpu intensive. What I discovered, is that the CPU throttles itself if it's temperature exceeds 70C. I was surprised also that the three remaining cores in the quadcore package did not show activity. I set up two encryption jobs and again, using top command, was unable to see if work was distributed to all cores.

    I am hoping that I am wrong, in that assuming that when a core reaches 70C, all the remaining cores are throttled.
    Leslie in Montreal

    Interesting web sites list
    http://forums.fedoraforum.org/showth...40#post1697840

  2. #2
    Join Date
    Dec 2013
    Location
    United Kingdom
    Posts
    6,144

    Re: How can I tell that Fedora is using more than one core of my 4 core cpu?

    GNOME System Monitor shows activity per core

    https://help.gnome.org/users/gnome-s...-check.html.en

  3. #3
    Join Date
    Oct 2010
    Location
    Canberra
    Posts
    2,952

    Re: How can I tell that Fedora is using more than one core of my 4 core cpu?

    Quote Originally Posted by lsatenstein
    Around 2012, I wrote some file encryption programs using DES3. (Triple DES). I set up a shell script to encrypt and decrypt a large file. Encryption an decryption is very cpu intensive. What I discovered, is that the CPU throttles itself if it's temperature exceeds 70C. I was surprised also that the three remaining cores in the quadcore package did not show activity. I set up two encryption jobs and again, using top command, was unable to see if work was distributed to all cores.
    Linux will assign a process to a core, and will from time to time move a process from one core to another.
    If you want a single process to be distributed across cores at the same time then you have to have a multi-threaded program.

    If you use a program like gkrelim you can watch a long running CPU intensive process jump from core to core.

  4. #4
    Join Date
    Jun 2005
    Location
    Montreal, Que, Canada
    Posts
    5,166

    Re: How can I tell that Fedora is using more than one core of my 4 core cpu?

    Antikythera

    Could not find your reference

    Ocratato
    I did a dnf install gkrelm* and yes it revealed that the cores were randomly selected. I will add it to crontab with the @reboot line and see what it reports historically.
    Leslie in Montreal

    Interesting web sites list
    http://forums.fedoraforum.org/showth...40#post1697840

  5. #5
    Join Date
    Apr 2005
    Location
    earth
    Posts
    1,355

    Re: How can I tell that Fedora is using more than one core of my 4 core cpu?

    I use these

    htop

    xosview +cpus

    watch -n1 -d cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
    x--x--x
    http://www.gnu.org/philosophy/free-sw.html
    Freedom is never Free.
    Pat Jr.

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