Problem with Native POSIX Thread Library

Problem with Native POSIX Thread Library

[Mikado]

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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Re: Problem with Native POSIX Thread Library

[Lawrence Bowie]

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 =====
> 
> 
> 
> 		
> __________________________________ 
> Start your day with Yahoo! - Make it your home page! 
> http://www.yahoo.com/r/hs
> -
> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: Problem with Native POSIX Thread Library

[Lawrence Bowie]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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 =====
> 
> 
> 
> 		
> __________________________________ 
> Start your day with Yahoo! - Make it your home page! 
> http://www.yahoo.com/r/hs
> -
> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

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Version: GnuPG v1.4.0 (GNU/Linux)

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XwulOScx1yPWEtN5ZXHgmLU=
=Yl1x
-----END PGP SIGNATURE-----

Re: Problem with Native POSIX Thread Library

[Mikado]

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 =====
> > 
> > 
> > 
> > 		
> > __________________________________ 
> > Start your day with Yahoo! - Make it your home page! 
> > http://www.yahoo.com/r/hs
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 



		
__________________________________ 
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Access over 1 million songs. Try it free.
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Re: Problem with Native POSIX Thread Library

[Markus Rechberger]

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 =====
> > >
> > >
> > >
> > >
> > > __________________________________
> > > Start your day with Yahoo! - Make it your home page!
> > > http://www.yahoo.com/r/hs
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> > > the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >
>
>
>
>
> __________________________________
> Yahoo! Music Unlimited
> Access over 1 million songs. Try it free.
> http://music.yahoo.com/unlimited/
> -
> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>


--
Markus Rechberger

Re: Problem with Native POSIX Thread Library

[Mikado]

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 =====
> > > >
> > > >
> > > >
> > > >
> > > > __________________________________
> > > > Start your day with Yahoo! - Make it your home page!
> > > > http://www.yahoo.com/r/hs
> > > > -
> > > > To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> > > > the body of a message to majordomo@vger.kernel.org
> > > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > > >
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> > > the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > >
> >
> >
> >
> >
> > __________________________________
> > Yahoo! Music Unlimited
> > Access over 1 million songs. Try it free.
> > http://music.yahoo.com/unlimited/
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >
> 
> 
> --
> Markus Rechberger
> -
> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 



	
		
__________________________________ 
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Re: Problem with Native POSIX Thread Library

[Markus Rechberger]

I changed it in /etc/security/limits.conf to get mysql work (you can
set this up per user), also check if PAM is set up correctly.

check out
http://nptl.bullopensource.org/Tests/NPTL-limits.html

"When you require the minimum stacksize (64Kb) with
>>pthread_attr_setstacksize()<<, you can create up to 262000 threads
before the stack becomes the limitation."

maybe this helps I haven't tried it though

Markus

On 10/17/05, Mikado <mikado4vn@yahoo.com> wrote:
> 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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> > >
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> >
> >
> > --
> > Markus Rechberger
> > -
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--
Markus Rechberger