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 >
