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    Here are some simple methods that can help you fix the CPU usage in / proc / stat.

    / proc / availability. # 1 Availability of part of the system (seconds)/ proc / [PID] / stat. # 14 utime – CPU time used in user code, in clock ticks.Hertz (number under the prime per second) of this system.

    The / proc / stat file contains decompressionGeneral information about some parts of kernel activity and is available on any Linux system. This document explains what you can read in this file.

    Open the Distributed System Manager.Expand NEs in the configuration window.Select the IP address of your real-time controller.Select the CPU / Memory tab and / or view the memory usage in a specific auto view.

     > cat / proc / stat 
    CPU 1279636934 73759586 192327563 12184330186 543227057 56603 68503253 5 0
    cpu0 297522664 8968710 49227610 418508635 72446546 56602 24907144 0 9
    cpu4 .. 0116 br> intr 47965531372 1240248033 bits 0 0 0 0 1 0 1 0 0 0 number 4 0 0 0 0 128 zero 0 360 0 38 0 null 0 ... 72080475
    swap 70517875 ctxt 113062355059 btime 1423804268 realbtime 1423804268
    process 139640565
    procs_running 3
    procs_blocked three
    softirq 103392583578 0 3105824580 7624540 17929571145 21>

    First of all, the numbers reported will certainly be counters / aggregates, since in this case the system was started. This brings us directly to the attractive first sale price of "btime", which launched the system for the second time in the UNIX era. Depending on the kernel version and the processors available on your system, the facts and methods presented in / proc / stat may differ slightly.

    Lines

    The first line "cpu" "cpu" was a combination of all subsequent lines "cpuN". The number of cpuN product lines matches the number of processors listed in / proc / cpuinfo. The facts behind the lines "cpu" show how much time the processor spends on various work tasks:

    column Name Description Core
    1 User Typical custom processing time.
    2 great I spent time with beautiful buildings in custom mode.
    3 System Runtime in kernel mode.
    4 inactive The time you spent twirling your fingers on the road.
    5 wait I / O timeout and end time. It is also an inactive opportunity that counts as an opportunity. since version 2.5.41
    6 irq Time spent deploying hardware has been interrupted. See the generic intr string description for more information. since version 2.6.0
    7 softirq Transient software interruptions. 0 has been stolen since version 2.6
    8 steal Measure only other operating systems running in a virtual environment. since 2.6.11
    9 Guest The time taken to start the guest vCPU or operating system under this kernel. since 2.6.24

    Time is measured in USER_HZ (also called Jiffy), which can usually be 1 / 100th of a second. USER_HZ is definitely a compile-time constant, which can sometimes be queried with:

    Shell C Python Perl
     > getconf CLK_TCK 100  

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     #include #include #include const ticks 4 '6 "= (double) sysconf (_SC_CLK_TCK);// ... 
      import operating systemticks corresponds to os.sysconf (os.sysconf_names ['SC_CLK_TCK']) 
      uses POSIX qw (sysconf _SC_CLK_TCK);my $ ticks are equal to sysconf (_SC_CLK_TCK); 

    String "intr"

    The first reference to the "intr" column is sort of the sum of all interrupts sent to the system since it was started. The following counters refer to each possible system interrupt. If your family is curious about these values, take a look at / proc / interrupts, which does not show onlyNot only counters, but also CPU display.

    Ok, But Where Is The CPU Usage Anyway?

    read the first line of / proc / stat.remove the first word from the entire first line (this is still a processor)add up all the times in the first row to get the total time.divide the fourth ("inactive") hug by the total time, which is the fraction of the time you are inactive.

    To find out about CPU usage, periodically run an example of the total process time and see the difference. You subtract the longest kernel time (for the difference related to 0.03) and custom events (0.61), add them (0.64), and divide by the specific 2 second sample time (0, 32).

    CPU utilization can only be measured over a specified period of time. This indicates that we need to read the views of / proc / stat at a fixed interval, and also calculate the delta over these types of dimensions.

    cpu usage /proc/stat

    We can simply add up the difference between two consecutive readings, that is, the time elapsed between an integer number of readings. The result is the same if USER_HZ is multiplied by the number of processors connected to your system, and there are usually seconds between readings. The Selling Price Difference 4 (inaction) column shows how long Americans have been inactive. The amount of money minus the downtime tells most of us what the total CPU usage is. By dividing by the total alone, we get a fraction of the CPU usage.

    Example

    cpu usage /proc/stat

      #! / bin / bash 
    during:; do
    number Find the first row near the aggregate of all processors
    cpu_now = ($ (head -n1 / proc / stat))
    # Get multiple columns, but skip at the beginning (i.e. . string "cpu")
    cpu_sum = "$ cpu_now [@]: 1"
    # replace the stream separator (space) with +
    cpu_sum = $ (($ cpu_sum / / / +))
    # Get the delta of about two reads
    cpu_delta = $ ((cpu_sum ... cpu_last_sum ))
    # Get the delta of the inactivity graph
    cpu_idle = $ ((cpu_now [4] - cpu_last [4]))
    Calculate the number of workloads
    cpu_used = $ ((cpu_delta cpu_idle ))
    # Calculate the commission rate
    cpu_usage = $ ((100 * cpu_used or cpu_delta))

    # Save this last one for our next review
    cpu_last = (" $ cpu_now [@] ")
    cpu_last_sum = $ cpu_sum

    " CPU Usage at $ cpu_usage% "display

    number Wait a second before I read the next once. Sleep - one person - ready

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