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Nicolas Joly wrote:
> Hi,
> 
> While playing with a 8 CPUs amd64 machine (4x dual-core 865 Opterons),
> i noticed that a simple threaded program (source attached) does not
> work with PTHREAD_CONCURRENCY >= 6. I already tested this small
> program on NetBSD/i386 and NetBSD/amd64, but never with 8 CPUs.
> 
> Is there anything i can tweak to make it work ?
> 
> njoly@thorgal [~]> PTHREAD_CONCURRENCY=8 ./thr
> main hello world
> thread hello world
> assertion "next != 0" failed: file "/local/src/NetBSD/src/lib/libpthread/pthread
> _run.c", line 130, function "pthread__next"
> zsh: abort (core dumped)  PTHREAD_CONCURRENCY=8 ./thr
> njoly@thorgal [~]> PTHREAD_CONCURRENCY=7 ./thr
> main hello world
> assertion "next != 0" failed: file "/local/src/NetBSD/src/lib/libpthread/pthread
> _run.c", line 130, function "pthread__next"
> zsh: abort (core dumped)  PTHREAD_CONCURRENCY=7 ./thr
> njoly@thorgal [~]> PTHREAD_CONCURRENCY=6 ./thr
> main hello world
> thread hello world
> assertion "next != 0" failed: file "/local/src/NetBSD/src/lib/libpthread/pthread
> _run.c", line 130, function "pthread__next"
> zsh: abort (core dumped)  PTHREAD_CONCURRENCY=6 ./thr
> njoly@thorgal [~]> PTHREAD_CONCURRENCY=5 ./thr
> main hello world
> thread hello world
> njoly@thorgal [~]> PTHREAD_CONCURRENCY=4 ./thr
> main hello world
> thread hello world
> njoly@thorgal [~]> PTHREAD_CONCURRENCY=3 ./thr
> main hello world
> thread hello world
> njoly@thorgal [~]> PTHREAD_CONCURRENCY=2 ./thr
> main hello world
> thread hello world
> njoly@thorgal [~]> PTHREAD_CONCURRENCY=1 ./thr
> main hello world
> thread hello world
> 
> This is a -current system from Nov. 7, running a GENERIC.MP kernel.
> 
> The full dmesg has already been posted on NetBSD/amd64 mailing list:
> <URL:http://mail-index.netbsd.org/port-amd64/2005/12/01/0003.html>
> 
> Thanks in advance,
> Regards.
> 
> 
> 
> ------------------------------------------------------------------------
> 
> #include <stdio.h>
>  
> #include <pthread.h>
> 
> void *thr_run(void *);    
> 
> 
> int main(int argc, char **argv) {
>   pthread_t thr;
>   
>   if (pthread_create(&thr, NULL, thr_run, NULL) != 0) {
>     err(1, "pthread_create"); }
>   
>   (void)printf("main hello world\n");  
> 
>   if (pthread_join(thr, NULL) != 0) {
>     err(1, "pthread_join"); }
>   
>   return 0; }
>  
>  
> void *thr_run(void *arg) {
>  
>   (void)printf("thread hello world\n");
>   
>   return NULL; }
> 
Hi

look here

http://mail-index.netbsd.org/tech-kern/2005/11/15/0012.html


Cheers


- --

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