/*******************************************************************************
* Test what the OS does, if there is no ram and cpu left.
* Author: Nico Schottelius <[email protected]>
* Date: 4th of July 2001
*
*
* 5th of Decembre 2001:
* added initialization of the new allocated ram. Without this 'feature'
* Linux 2.4 has no problems. It is even possible to allocate 2000 MB RAM,
* where only 128 MB is! (Linux gives you 'SoftRam'...)
*
******************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#define lint long int
lint add(lint last) {
if(last == 0)
return last;
else if(last < 0)
return -1;
else
return last + add(last -1);
}
int main ( void )
{
char **uebervoll = NULL;
int x = 1, a = 0; /* how many megs to allocate within one step */
int one_k = 1024;
int one_meg = one_k * 1024;
lint i = 0;
uebervoll = (char **) realloc(uebervoll, (i+1) * sizeof(char *) );
for(i=0;;) {
uebervoll = (char **) realloc(uebervoll, (i+1) * sizeof(char *));
if(uebervoll != NULL) {
uebervoll[i] = (char *) malloc(x * one_meg * sizeof(char) );
/* init allocated ram */
for(a=0;a<(x*one_meg*sizeof(char));a++) uebervoll[i][a] = 'a';
if(uebervoll[i] != NULL) {
i++;
printf("%d MB RAM allocated\n",x * i);
}
}
}
}
Nico Schottelius <[email protected]> writes:
> Hello Folks!
>
> A small ansi C program which tries to get all cpu power and as much ram
> as possible got my system.
$ man setrlimit
-Doug
--
Let us cross over the river, and rest under the shade of the trees.
--T. J. Jackson, 1863
> NIco,
>
> can you describe your system a bit - hardware and especially LInux
> Kernel version? Please answer to the list,
No problem at all:
cpuinfo:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 5
model name : Pentium II (Deschutes)
stepping : 3
cpu MHz : 399.323
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
cmov pat pse36 mmx fxsr
bogomips : 796.26
mainboard: ??? (must be some asus or gigabyte...I think it was a
gigabyte,
the one with the adaptec 7880 scsi controller on board.
RAM: 128 + 256 MB
Kernel 2.4.13
Does this help or do you need more informations ?
Sincerly,
Nico Schottelius
I am some kind of busy -
Do not expect an answer within 24 hours.
Instead use the telephon: +49 (0) 173 - 750 7022.
Doug McNaught wrote:
> Nico Schottelius <[email protected]> writes:
>
> > Hello Folks!
> >
> > A small ansi C program which tries to get all cpu power and as much ram
> > as possible got my system.
>
> $ man setrlimit
thanks for the answer!
I just thought linux could handle itself a process which tries to gain all
cpu power.
Using setrlimit I can setup maximum cpu time seconds, but not maximum use of
cpu
at a time, can't I ?
--
Nico Schottelius
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