I ran it into:
4.11-STABLE FreeBSD Wed Jan 19 15:23:33 CST 2005
What you find in
http://www1.cr.freebsd.org/~jose/stress.tgz
is the output of:
ktrace ./a.out > stress.txt
On Mon, 2005-01-24 at 14:27 -0800, Yan Yu wrote:
> Hi, all, I have a newbie Q:
> I am trying to use creating large number of threads and allocting
> memory to stress the system.
> My user program causes SEG fault in the kernel code, kse_release () in
> kern_kse.c.
> (it SEG fault before the system can be stressed;(
>
> the stack when the SEG fault happens are:
> #0 0x08064e54 in kse_release ()
> #1 0x080531c4 in kse_sched_single ()
> #2 0x00000000 in ?? ()
>
> My simple program is:
> I have a simple function to create threads:
>
> #define NUM_THREADS 5000
> #define THREADS_IN_ONE_PROCESS 5
> #define BSIZE 500000
> static int cc;
>
> void CreateThread(int n)
> {
> assert( n <= NUM_THREADS );
> pthread_t threads[NUM_THREADS];
> int rc, t;
> for(t=0;t < n;t++){
> printf("#%d: Creating thread %d\n", cc, t);
> cc++;
> rc = pthread_create(&threads[t], NULL, PrintHello, (void *)t);
> if (rc){
> printf("ERROR; return code from pthread_create() is %d\n", rc);
> }
> }
>
> unsigned long id;
> char * p = (char *) calloc(BSIZE, sizeof(char) );
> if ( p == NULL )
> {
> fprintf(stderr, "calloc error\n");
> }
> while (1)
> {
> while (BSIZE <= (id = rand() / (RAND_MAX/BSIZE)));
> p[id] ++;
> }
> }
>
> void *PrintHello(void *threadid)
> {
> printf("\n%d: Hello World!\n", threadid);
> CreateThread(THREADS_IN_ONE_PROCESS);
> pthread_exit(NULL);
> }
>
> int main (int argc, char *argv[])
> {
> CreateThread(THREADS_IN_ONE_PROCESS);
> }
>
> The SEG fault happens after creating nearly 5000 threads.
> and I use the default pthread.h coming w/ freeBSD 5.3
> #define PTHREAD_KEYS_MAX 256
> #define PTHREAD_STACK_MIN (1 << 22)
> #define PTHREAD_THREADS_MAX ULONG_MAX
>
>
> Any idea on what might happen?
>
> Many Thanks!
> yan
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--
Jose Hidalgo Herrera <[EMAIL PROTECTED]>
Corp. Hostarica
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