I think that the problem is a very bad page release or something like
that. Once entered in the swap frenzy, the system is very difficult to
reconvert. Swapoff do not work (it say no free memory) and I have to
stop VirtualBox, which used half of the memory, to regain control in the
system.
Again, this did not happen at all with Karmic.
If I fill the memory and push the thing to swap it happens again. I use
a little program to fill the mem to test it, attached below.
Exiting VirtualBox resume normal working of the system, until you fill
memory again, when swap starts load average jump high ans system became
really sloppy.
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char** argv) {
char * mem;
long nblocks;
int i;
if (argc!=2) {
fprintf(stderr, "Usage: %s <number_of_MB>\n", argv[0]);
exit(1);
}
nblocks = atoi(argv[1])*1024;
for(i=0;i<nblocks;i++) {
mem = (char*)malloc(1024);
mem[1]='A';
if ((i%1024)==0) {
printf("%s:%4d Mbyte allocated and touched\n",
argv[0], (int)(i/1024));
}
}
/* uncomment this to sit here while(1) {sleep(10);}*/
return 0; /* and free */
}
--
lucid lynx going into disk activity frenzy, stalls for minutes
https://bugs.launchpad.net/bugs/582264
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