These two links will likely be able to help you:

On Fri, Dec 14, 2018 at 4:50 PM Weicheng Xue <> wrote:

> Hi all,
>      I am now having a GPU Direct issue. I loaded gcc/5.2.0,
> openmpi-gdr/2.0.0, cuda/8.0.61, on two Nvidia P100 GPUs. The program I am
> now testing is a very simple test code, having one GPU to send a buffer to
> another GPU directly. After running with "mpirun -mca
> btl_openib_want_cuda_gdr 1 -np 2 ./executable", the terminal returned "You
> requested to run with CUDA GPU Direct RDMA support but this OFED
> installation does not have that support.  Contact Mellanox to figure out
> how to get an OFED stack with that support." I am wondering how to fix this
> issue. Thank you very much!
> Best Regards,
> Weicheng Xue
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