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SubjectRe: NPTL: stack limit limiting number of threads
On Fri, May 13, 2005 at 08:02:48PM -0400, Ritesh Kumar wrote:
> Thanks for your reply. I actually went ahead after getting your
> mail and coded up a small program to check the stack limit
> deliberately. The program is shown inline.
>
> #include <stdio.h>
>
> #define BUF_SIZE 1024000
>
> void recurse(int n){
> char ch[BUF_SIZE];
> if(n<=0)
> return;
> else
> recurse(n-1);
> }
>
> int main(argc, argv)
> int argc;
> char **argv;
> {
> if(argc!=2){
> printf("Usage: %s <n (megabytes)>\n", argv[0]);
> return 1;
> }
> printf("Checking for %dMB\n", atoi(argv[1]));
> recurse(atoi(argv[1]));
> }
>
> Its a fairly crude way to find out the actual stack limit. Basically,
> the resurse function recurses each time allocating ~1MB of space on
> the stack. The program segfaults exactly at the ulimit -s value of
> stack size on both linux and freebsd. So it does seem that the ulimit
> -s is the value of stack limit used on FreeBSD.

For the main stack sure. But now try to call that recurse in
some other thread.

Jakub
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