[lkml]   [2004]   [Dec]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: 2.6.9, 64bit, 4GB memory => panics ...
    On Sun, 2004-12-05 at 13:26, Zwane Mwaikambo wrote:
    > Make sure that you have the following option in your kernel;
    > 7:35:respawn:/sbin/agetty 38400 ttyS0
    > Finally all you need is a program on the monitoring system, minicom
    > should suffice if you have nothing else.
    > Zwane

    Thanks a lot Zwane, appreciate these tips !

    I am now trying to be better prepared for my next 4gb test, and
    have been working on a small program that should "eat memory".
    I'm not sure I am doing the right thing though ...

    The idea was to create an app that would consume a lot of memory
    without touching any other system resources.

    At first I used ksysguard to watch the memory consumption.
    Interestingly enough, it was "wired": The VmSize column seems
    to jump randomly, once I get 1,051 than I will see 3,148,615
    than I will get 2,789 than I might see 1,073,976 than it will
    give me 3,148 .... all during the same run of my mem eater app.

    ... just mentioning it here in case there is a connection between
    my problem and this wired display ...

    Now this testing was done with 2GB at first ... no kernel panics
    with 2GB.

    Than I decided to use /proc/meminfo, but that suggests that I
    am not using all memory at all ! With 2GB malloc fails after
    510 iterations (510 MB ???) ... (I have a 10GB swap partition)
    And /proc/meminfo confirms that:
    MemTotal: 2056528 kB
    MemFree: 1526424 kB

    About 1/2 gig is used, I checked limits, and that said unlimited ...
    What else can block memory usage ? May be I just need to start my
    app several times ?!

    Hmm, after forking mem eater 6 times I get:
    MemTotal: 2056528 kB
    MemFree: 610000 kB
    Which is almost the same as after 4 and 5 spins ...

    Any ideas/suggestion ?

    Thanks a lot guys & gals !

    Kind Regards,

    // -------------------------- eat mem ---------------------------------

    #include "stdio.h"
    #include "stdlib.h"

    int main() {

    int mem[10000];
    int i, n;

    for(i=0;i<2000;i++) {
    printf("Doing alloc %0d ...\n",i);
    mem[i] = (int)malloc(1024*1024*1024);
    if(mem[i] == NULL)
    printf("Malloc failed ...\n");
    for(n=0;n<(1024*1024*1024);n=n+640) mem[i] = n;



    // --------------------------------------------------------------------

    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 14:08    [W:0.041 / U:4.768 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site