From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mikado <mikado4vn@yahoo.com>
Subject: Re: Problem with Native POSIX Thread Library
Date: Sun, 16 Oct 2005 10:53:26 -0700 (PDT)
Message-ID: <20051016175326.70266.qmail@web53704.mail.yahoo.com>
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To: Lawrence Bowie <thesource@ldb-jab.org>
Cc: linux-c-programming@vger.kernel.org

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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