Thanks, Gilles On Sun, May 24, 2015 at 7:41 PM, Gilles Gouaillardet < gilles.gouaillar...@gmail.com> wrote:
> yes, that is clearly suboptimal. > > the optimal option is something like -bind-to hwthreads > (I am afk so I cannot confirm this) > > Cheers, > > Gilles > > On Sunday, May 24, 2015, XingFENG <xingf...@cse.unsw.edu.au> wrote: > >> Hi, Gilles, >> >> Thanks very much for your respond. But if I oversubscribe, would the >> performance be influenced? >> >> On Sun, May 24, 2015 at 7:24 PM, Gilles Gouaillardet < >> gilles.gouaillar...@gmail.com> wrote: >> >>> Hi Xing, >>> >>> iirc, open MPI default behavior is to bind to cores (vs hyperthreads), >>> hence the error message. >>> >>> I cannot remember the option to bind to threads, but you can mpirun >>> --oversubscribe if you are currently stuck >>> >>> Cheers, >>> >>> Gilles >>> >>> >>> On Sunday, May 24, 2015, XingFENG <xingf...@cse.unsw.edu.au> wrote: >>> >>>> Hi, OPENMPI users, >>>> >>>> I have met some problem while doing experiments on Amazon EC2. I have >>>> chosen instance type r3.2xlarge. As amazon claimed, it has 8 vcpu. Each >>>> vCPU is a hyperthread of an Intel Xeon core for M3, C4, C3, R3, HS1, G2, >>>> I2, and D2. (from *https://aws.amazon.com/ec2/instance-types/ >>>> <https://aws.amazon.com/ec2/instance-types/>)* >>>> >>>> However, when I try to run experiments on 4 machines, each with 8 >>>> slots. OPENMPI reminds me that I am oversubscribing. >>>> >>>> Does anyone know the reason? Thanks in advance! >>>> >>>> >>>> -- >>>> Best Regards. >>>> --- >>>> Xing FENG >>>> PhD Candidate >>>> Database Research Group >>>> >>>> School of Computer Science and Engineering >>>> University of New South Wales >>>> NSW 2052, Sydney >>>> >>>> Phone: (+61) 413 857 288 >>>> >>> >>> _______________________________________________ >>> users mailing list >>> us...@open-mpi.org >>> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >>> Link to this post: >>> http://www.open-mpi.org/community/lists/users/2015/05/26909.php >>> >> >> >> >> -- >> Best Regards. >> --- >> Xing FENG >> PhD Candidate >> Database Research Group >> >> School of Computer Science and Engineering >> University of New South Wales >> NSW 2052, Sydney >> >> Phone: (+61) 413 857 288 >> > > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2015/05/26911.php > -- Best Regards. --- Xing FENG PhD Candidate Database Research Group School of Computer Science and Engineering University of New South Wales NSW 2052, Sydney Phone: (+61) 413 857 288
