> On Sun, 3 Aug 1997, David S. Miller wrote:
>
> > Here is a fun program, I fire off 50 or 60 of these when stress
> > testing sparc64/SMP lately. Run a bunch of these, a 'top d 0' in
> > an xterm, and a 'make -j' in another window. That should make
> > interesting things happen, especially under SMP.
> >
> > int main(void)
> > {
> > int pid;
> >
> > while(1) {
> > switch (pid = fork()) {
> > case -1:
> > exit(1);
> > case 0:
> > exit(1);
> > default:
> > while(wait(0) != pid)
> > ;
> > };
> > }
> > return 0;
> > }
> >
>
> Would 'interesting things' happen to be..
> _setutent: Can't open utmp file: File table overflow
> with top segfaulting and (sometimes) the make -j also segfaulting?
> The xterm was permanently broken, outputing..
> sh: command_substitute: cannot duplicate pipe as fd1: Bad file number
> The same thing happened to a shell (make -j) in a normal vt, but after a short
> while, it started working again. (I mean _after_ killing all fun_programs)
>
> Test method: (make -j tried both in xterm and vt)
> 60 x fun_program
> 1 x top d 0
> 1 x make -j bzImage
> (short time watching to see if it's going to do something interesting.. nope)
> runx
> 1 x top d 0
> 2 x xboard (it made a wrong move and caught it itself :)
> ~5 minutes of this, and interesting happened.
>
> -Mike
>
>
I plead 14 hrs testing/benching.. forgot to mention which kernel. pre-2.1.48-4