[lkml]   [2002]   [Mar]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [Lse-tech] 7.52 second kernel compile
    On Sat, 16 Mar 2002 09:37:00 -0800, 
    "Martin J. Bligh" <> wrote:
    >Are you still doing something like this?
    ># MAKE="make -j14" /usr/bin/time make -j14 bzImage
    >I tried setting the MAKE variable as well as doing the -j,
    >but it actually made kernel compile time slower - what difference
    >does it make on your machine? Can somebody clarify what this
    >actually does, as opposed to the -j on the command line?

    It depends on which version of make you are using. make 3.78 onwards
    has a built in job scheduler which shares the value of -j across its
    children, yea unto the nth generation. Earlier versions of make did a
    simplistic 'run -j copies of make at the top level' and did not
    propagate -j to the lower levels.

    With the recursive makefiles and make < 3.78 you need MAKE="make -j" to
    get a decent speedup because of the lack of choices at the top level
    Makefile. With make >= 3.79 you do not need MAKE="make -j14", it can
    interfere with make's own scheduler. See also make -l LOAD.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:25    [W:0.026 / U:6.252 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site