James Bensley wrote:
>> It will kick in, regardless of priority.
>>
>> But probably someone will come up with a small c program which eats all
>> available memory :)
>>
>> Regards,
>>
>> Ralph
>
> I would be interested in such a program if anyone has one or a mega
> bash script that can achive the same?
>
cat /proc/meminfo says it all, but if you really want to test this can
do the job:
[nthierry@tryo tmp]$ cat totalMem.c
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
int size = 0 ;
while(1)
{
if (malloc(1024*1024*sizeof(char)))
size++ ;
else
{
printf("Total available memory: %d Mb\n", size) ;
exit(0) ;
}
}
}
[nthierry@tryo tmp]$ gcc -W -Wall totalMem.c
[nthierry@tryo tmp]$ su -
[root@tryo tmp]# echo 2 > /proc/sys/vm/overcommit_memory
[root@tryo tmp]# echo 100 > /proc/sys/vm/overcommit_ratio
[NOTE: the previous 2 commands must be run as root, and disable the
memory overcommit mode. See man malloc (under BUGS) and man proc (search
for overcommit) for details.]
[root@tryo tmp]# swapoff -a
[root@tryo tmp]# ./a.out
Total available memory: 1487 Mb
[root@tryo tmp]# swapon -a
[root@tryo tmp]# ./a.out
Total available memory: 2056 Mb
This system has 600 Mb swap space and 2 Gb of RAM of which ~500 Mb are
currently used by other processes.
So it works, and shows that the swap is indeed available.
When satisfied restore the vm settings
[root@tryo tmp]# echo 50 > /proc/sys/vm/overcommit_ratio
[root@tryo tmp]# echo 0 > /proc/sys/vm/overcommit_memory
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