What is CPU utilization and how can it be calculated?

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  • ranson
    replied
    Re: What is CPU utilization and how can it be calculated?

    I do agree that there may be a variance in the CPU utilization as per the magnitude of the computing tasks. Nice example to comprehend the calculation for CPU utilization.
    You can also check the : https://www.eukhost.com/blog/webhost...ity-computing/
    Last edited by Rsync; 30-05-2022, 08:31.

    Leave a comment:


  • Priya Dialani
    replied
    Re: What is CPU utilization and how can it be calculated?

    A simple way to calculate CPU utilization is
    U=R/C

    U= Utilization
    R= Requirements which in simple terms is the BUSY TIME
    C= Capacity which is simple terms is BUSY TIME + IDLE TIME

    For eg:
    BUSY TIME= R = 3042450
    BUSY TIME + IDLE TIME = C = 3042450 + 2644830 = 5687280

    CPU Utilization is

    3042450/5687280= 0.535 = 53%

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  • Guest
    Guest replied
    Re: What is CPU utilization and how can it be calculated?

    Utilization is basically requirement divided by capacity. This can be understood with an example.

    Consider a water bottle of capacity 1000 ml ( C )
    The bottle is half full i.e. 500 ml
    Requirement to fill the bottle is additional 500 ml ( R )
    Hence, the utilization will be U= R divided C

    = 500 / 1000 * 100
    = 0.5 * 100
    = 50 %

    Hence, If the bottle is half full the utilization percentage of the bottle is 50 %

    Leave a comment:


  • What is CPU utilization and how can it be calculated?

    CPU utilization is the sum of work handled by a Central Processing Unit. It is also used to estimate system performance. CPU utilization can vary according to the type and amount of computing task because some tasks require heavy CPU time while others require less CPU time. Process time is another name for CPU time and is the amount of time used by a CPU for processing instruction of an operating system or a computer program. CPU time is quantified in clock ticks or seconds. CPU utilization shows the burden on a processor in terms of percentage that indicates if any changes are to be made in the system otherwise it may get exhausted of capacity.

    CPU utilization can be calculated by using the following formulas.

    Let us define CPU utilization as U

    U = 100% - (Percentage of time that is spent in idle task)

    % time in idle task =

    (Take the average time period of background task without load) * 100%
    -------------------------------------------------------------------------------------------------------
    (Avg. period of background task including some load)

    Percentage time in idle task =

    (BG loop count computed during 25 ms) *100%
    ----------------------------------------------------------------------
    (BG loop count projected in an unloaded CPU)

    Actual % =

    Scaled % * (100%)
    ------------------------------
    max value 8 bit value

    Note: CPU utilization upsurges when a system process requires more time.
    Last edited by Rsync; 13-06-2022, 10:03.
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