BTW, before someone ask, I did configure with --enable-smp
--enable-x86-sep --enable-posix-auto-mlockall
/sl
On 10/22/2010 05:48 PM, Simon Leonard wrote:
>
> I sort of have a newbie problem regarding getting multiple threads
> running on multiple cores (quad core). It did work on my previous system
> (2.5-rc1) but I can't get it to work with 2.5.5.2 (or 2.5.5.1, 2.5.4).
> Here's my small example:
>
> #include<pthread.h>
> void* thread( void* ){
> unsigned long long i=0;
> while( 1 ) i++;
> return NULL;
> }
>
> int main(){
>
> pthread_t tid1, tid2, tid3, tid4;
> pthread_attr_t at1, at2, at3, at4;
>
> pthread_attr_init(&at1 );
> pthread_attr_init(&at2 );
> pthread_attr_init(&at3 );
> pthread_attr_init(&at4 );
>
> pthread_create(&tid1,&at1, thread, NULL );
> pthread_create(&tid2,&at2, thread, NULL );
> pthread_create(&tid3,&at3, thread, NULL );
> pthread_create(&tid4,&at4, thread, NULL );
>
> pthread_join( tid1, NULL );
>
> return 0;
> }
>
> If I compile with
> g++ main.cpp -lpthread
> and run I get 400% load (4 cores)
>
> If I compile with
> g++ main.cpp `/usr/xenomai/bin/xeno-config --skin posix --cflags`
> `/usr/xenomai/bin/xeno-config --skin posix --ldflags`
> I only get 100% load (1 core)
>
> Regards.
>
> /sl
>
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> Xenomai-help mailing list
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