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    SubjectRe: lost memory on a 4GB amd64
    On Sat, 23 Oct 2004, Andi Kleen (AK) wrote:

    AK> > dmesg-2.6.9-smp-noNUMA (working one)
    AK>
    AK> I bet that if you fill all memory on the non NUMA setup
    AK> it will crash too.
    AK>
    AK> e.g. run something like this
    AK>
    AK> #include <stdlib.h>
    AK> #include <string.h>
    AK> #include <unistd.h>
    AK> #include <stdio.h>
    AK>
    AK> #define MEMSIZE
    AK> main()
    AK> {
    AK> unsigned long len = (sysconf(_SC_AVPHYS_PAGES) - 10)* getpagesize();
    AK> char *mem = malloc(len);
    AK> for (;;) {
    AK> memset(mem, 0xff, len);
    AK> printf(".");
    AK> }
    AK> }

    what's the difference to the program I posted (here a link to an archive:
    http://marc.theaimsgroup.com/?l=linux-kernel&m=109567610824746&w=4

    other than yours is filling the memory with 0xFF and mine with 0x00 and
    mine does it only once and yours continuously?

    BTW: I added an fflush(stdout) after the printf and after two lines of
    dots on a 150 cols terminal I just stopped the Program. This is with
    2.6.9-smp-noNUMA.

    on a 2.6.9-smp-NUMA, running my program crashes the kernel immediately.


    c ya
    Sergei
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