May be you're right - it has to do with the OS (Linux, kernels tried
2.6.22,2.6.20,2.6.18). I have tried running about 7 copies of the
program. Each allocating (but not initializing) 2Gb of virtual memory on
a machine that has just 2Gb of physical memory. None has freed any of it
until it exited. I've tried initializing the memory and the machine just
swaps when I run the next program. And this is after everything was
freed in the previous copy.
Plus, this code just works as it should:
#include <stdio.h>
int
main (void)
{
int i, j, k;
int c = 10000;
char * m[c];
printf("press any key to allocate matrices...");
getchar();
// allocate the matrices
for (i = 0; i < c; i++)
m[i] = malloc(100*100*8);
// write to the memory
// initialize the matrices
for (k = 0; k < c; k++)
for (i = 0; i < 100*100*8; i++)
m[k][i] = 'a';
printf("press any key to free the memory ...");
getchar();
for (i = 0; i < c; i++)
free (m[i]);
printf("press any key to exit... ");
getchar();
return 0;
}
Bottomline:
There is a problem - memory does not get deallocated! and thus cannot be
reclaimed. The simple example to demonstrate this is provided in my
previous emails. In a serious project running for long time that is a
disaster. Though, it needs to be determined where the trouble comes
from.
Thanks for the prompt reaction!
--
Sergey
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