Re: Problem with Native POSIX Thread Library

[Mikado <mikado4vn@yahoo.com>]

Hi thank you, Markus

I decreased my stack size limit to 512k then it's ok, it now can creates about 6000 threads then
it gets errors:

Error creating thread 6067: Resource temporarily unavailable
Error creating thread 6068: Resource temporarily unavailable
Error creating thread 6069: Resource temporarily unavailable
Error creating thread 6070: Resource temporarily unavailable
....

But i'm wondering if there is a way to make it better. Maybe this problem happens 'cause of my
small RAM size.

--- Markus Rechberger <mrechberger@gmail.com> wrote:

> Hi,
> 
> check your ulimits
> 
> $ ulimit -a
> core file size        (blocks, -c) 0
> data seg size         (kbytes, -d) unlimited
> file size             (blocks, -f) unlimited
> max locked memory     (kbytes, -l) unlimited
> max memory size       (kbytes, -m) unlimited
> open files                    (-n) 1024
> pipe size          (512 bytes, -p) 8
> stack size            (kbytes, -s) 8192
> cpu time             (seconds, -t) unlimited
> max user processes            (-u) unlimited
> virtual memory        (kbytes, -v) unlimited
> 
> lower the stack size and try again (read on more about it if you set
> it to low globally you could get into trouble with your system)
> 
> Markus
> 
> On 10/16/05, Mikado <mikado4vn@yahoo.com> wrote:
> > Thank Lawrence, I've got this error message:
> >
> > Error creating thread 382: Cannot allocate memory
> > Error creating thread 383: Cannot allocate memory
> > Error creating thread 384: Cannot allocate memory
> > Error creating thread 385: Cannot allocate memory
> > Error creating thread 386: Cannot allocate memory
> > Error creating thread 387: Cannot allocate memory
> > ................
> >
> > It always begins at thread 382. My RAM is 256+128 MB, isn't it enough???? hm... still in
> trouble
> > now.
> >
> >
> > --- Lawrence Bowie <thesource@ldb-jab.org> wrote:
> >
> > > These modifications below might shed some light on your issue.
> > >
> > > LDB
> > >
> > > ------------------- CODE ---------------------------
> > > #include <stdio.h>
> > > #include <unistd.h>
> > > #include <pthread.h>
> > > #include <errno.h>
> > > #include <string.h>
> > >
> > > #define MAX 10000
> > >
> > > void print_msg(void * msg);
> > > int main(void);
> > >
> > > void print_msg(void * arg)
> > > {
> > >     pthread_detach(pthread_self());
> > >     sleep(10);
> > >     pthread_exit(NULL);
> > > }
> > >
> > > int main(void)
> > > {
> > >     pthread_t thread_id[MAX];
> > >     int i, ret, err;
> > >
> > >     for (i = 0; i < MAX; i++)
> > >     {
> > >           ret = pthread_create(&thread_id[i], NULL, (void *)&print_msg,
> > > (void *)0);
> > >
> > >           if (ret) {
> > >               err = errno;
> > >               printf("Error creating thread %d: %s\n", i,strerror(err));
> > >           }
> > >      }
> > >
> > >     pthread_exit(NULL);
> > > }
> > > ----------------------- CODE -------------------------------
> > >
> > > Mikado wrote:
> > > > Hi all,
> > > >
> > > > I'm using 2.6 kernel with NPTL support in kernel and libc but I cannot create more than
> 400
> > > > threads with NPTL. In the past, I used 2.4 kernel and I can create about 1500 threads. I
> dont
> > > want
> > > > to use traditional LinuxThread because I dont like the way it pthread_detach() (it
> "clone"s
> > > too
> > > > many processes). Reading some documents about NPTL, I thought it can creates many threads
> but
> > > it's
> > > > not true in my case. I need somebody's help. Thanks in adv.
> > > >
> > > > System info:
> > > > - Kernel: 2.6.13.4
> > > > - RAM: 256 + 128
> > > > - CPU: PentiumIII 937.939MHz
> > > >
> > > > My code is below:
> > > >
> > > > ===== CODE =====
> > > > #include <stdio.h>
> > > > #include <unistd.h>
> > > > #include <pthread.h>
> > > >
> > > > #define MAX 10000
> > > >
> > > > void print_msg(void * msg);
> > > > int main(void);
> > > >
> > > > void print_msg(void * arg)
> > > > {
> > > >         pthread_detach(pthread_self());
> > > >         sleep(10);
> > > >         pthread_exit(NULL);
> > > > }
> > > >
> > > > int main(void)
> > > > {
> > > >         pthread_t thread_id[MAX];
> > > >         int i, ret;
> > > >
> > > >         for (i = 0; i < MAX; i++)
> > > >         {
> > > >                 ret = pthread_create(&thread_id[i], NULL, (void *)&print_msg, (void *)0);
> > > >                 if (ret)
> > > >                         printf("Error creating thread %d\n", i);
> > > >         }
> > > >
> > > >         pthread_exit(NULL);
> > > > }
> > > > ===== CODE =====
> > > >
> > > >
> > > >
> > > >
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> 
> --
> Markus Rechberger
> -
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