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
