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Thread: i7 benchmark (kernel compile time), help?

  1. #1
    Join Date
    Feb 2010

    Default i7 benchmark (kernel compile time), help?

    Hello folks, I wanted to test my new i7 build and compiled the kernel to check the results. Using the time command to benchmark, I got these results:

    real 21m29.909s
    user 47m55.350s
    sys 6m11.100s

    Initially I sat & watched the process thinking it will probably be completed in 5-10 minutes. But anyway, went off for some coffee & snacks to return and see it still compiling.

    n00b query: what are these times ? Does the real time mean the total time taken since I sat watching the screen, went for snacks, and came back ? I mean I definitely didn't spend 47 minutes on the coffee! In short, is that the metric I need to optimize ?

    The test configuration:
    Core i7 920 OCed to 3 Ghz | Corsair 1333 MHz 6G RAM | WD Blue 500G HDD

    Also, I checked the system monitor in between and the memory usage was only around 600M. ugh, why couldn't make use more memory and make things faster ?!

  2. #2
    Join Date
    Sep 2008


    How many make-jobs you have used?
    On an i7 you should compile with -j8.

  3. #3
    Join Date
    Feb 2008


    man time:
    These statis-
    tics consist of (i) the elapsed real time between invocation and termi-
    nation, (ii) the user CPU time (the sum of the tms_utime and tms_cutime
    values in a struct tms as returned by times(2)), and (iii) the system
    CPU time (the sum of the tms_stime and tms_cstime values in a struct
    tms as returned by times(2)).
    In short, real is the wall clock time elapsed.

  4. #4
    Join Date
    Feb 2010


    Thanks for the replies.

    Yes, I did set CONCURRENCY_LEVEL=8 when executing make. Is it different from -j 8 option ?

    Also, after further stripping the kernel, I did get a 5 minutes real time.

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