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SubjectRe: FreeBSD & Linux [./fork 500 totally hangs my machine 2.1.127]
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The fork call returns -1 and then you kill -1.
You must be running as root!!!!
Allen

>>>"Hans Eric =?ISO-8859-1?Q?Sandstr=F6m" ?= said:
> Hans Eric Sandström wrote:
>
> > Sher Pavel A. wrote:
> >
> > > Can somebody tell me why this program under FreeBSD works much more fast
er
> > > then under Linux ?
> > >
>
> I did put in one sleep and tested on my macine:
> ./fork 100 - 1 sec
> ./fork 200 - 2 sec
> ./fork 300 - 2 sec
> ./fork 400 - 3 sec
> ./fork 500 *** My machine totally hangs.
>
> Please Alan, Can you explain this or is this some bug in the kernel??
>
> -- Moified fork.c program.
> #include <stdio.h>
> #include <unistd.h>
> #include <time.h>
> #include <stdlib.h>
> #include <sys/types.h>
> #include <signal.h>
>
> void main(int argc, char *argv[])
> {
> unsigned int num, i, st;
> time_t new_time, old_time;
> int *pid;
>
> if (argc < 2) {
> printf("Usage: fork nnn\n");
> _exit(0);
> }
> num=atoi(argv[1]);
> pid=malloc(sizeof(int)*num);
> old_time=time(NULL);
> for (i=0; i<num; i++) {
> st=fork();
> if (st == 0) {
> while (1) {
> sleep(1);
> printf("Process %i got one tick.\n", i);
> }
> _exit(0);
> }
> pid[i]=st;
> printf("Process %i started.\n", i);
> }
> for (i=0; i<num; i++) {
> kill(pid[i], SIGKILL);
> printf("Process %i killed.\n", i);
> }
> new_time=time(NULL);
> printf("Total time to spawn and kill %i processes : %i\n", num,
> new_time-old_time);
> }
>
>
>
> -
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---------------------------------
G. Allen Morris III
-
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