Re: lost memory on a 4GB amd64

[Sergei Haller]

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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