From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4CC2078F.2070301@domain.hid> Date: Fri, 22 Oct 2010 17:52:15 -0400 From: Simon Leonard MIME-Version: 1.0 References: <4CC206AE.5010704@domain.hid> In-Reply-To: <4CC206AE.5010704@domain.hid> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-help] SMP load List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: xenomai@xenomai.org 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 > 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 > > _______________________________________________ > Xenomai-help mailing list > Xenomai-help@domain.hid > https://mail.gna.org/listinfo/xenomai-help