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SubjectRe: forking

i ran that as a normal user with only the shell and ssh open and it only
got to 26.

-Cygnus

On Tue, 20 Apr 1999, Richard B. Johnson wrote:

> On Tue, 20 Apr 1999, Greg Lindahl wrote:
>
> > > Ok then, we seem to be looking at a 2.2.x problem, what regarding, I
> > > don't know. It's not in 2.0.x (I've pushed my box into the 512 range on
> > > 2.0.36 and then received the "cannot fork"). Suggestions so far have
> > > been memory fragmentation and insufficient procs. Anyone else have
> > > ideas?
> >
> > Actually, I've always had a problem like this on 2.0.x. I have a
> > 64-node cluster, and I frequently run scripts which fork 128 processes
> > at a time. These scripts occasionally get 'cannot fork', with no
> > resource starvation evident... I wrote some test programs but wasn't
> > able to get a nice, repeatable behavior.
> >
>
> I get 501 on my system.
>
> #include <stdio.h>
> #include <unistd.h>
> #include <signal.h>
> #include <wait.h>
>
> void reap(int unused)
> {
> while(wait3(&unused, WNOHANG, NULL) != -1)
> ;
> }
>
> main()
> {
> int i = 0;
> (void)signal(SIGCHLD, reap);
> for(;;)
> {
> switch(fork())
> {
> case 0:
> pause();
> exit();
> case -1:
> kill(-1, SIGINT);
> exit(1);
> default:
> fprintf(stderr,"Forks = %d\n", i++);
> }
> }
> return 0;
> }
>
> Cheers,
> Dick Johnson
> ***** FILE SYSTEM WAS MODIFIED *****
> Penguin : Linux version 2.2.6 on an i686 machine (400.59 BogoMips).
> Warning : It's hard to remain at the trailing edge of technology.
>
>
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