Supun,
did you configure Open MPI with --disable-dlopen ?
It was previously reported that this option disable the patcher (memory
registration),
which impacts performance negatively.
If yes, then I suggest you reconfigure (and rebuild) without this option
and see if it helps
Cheers,
Gilles
On 3/21/2018 2:46 AM, Supun Kamburugamuve wrote:
Hi,
I'm trying to run a small benchmark with Infiniband and Ethernet to
see the difference. I get strange results where OpenMPI seems to be
slower with Infiniband than Ethernet. I'm using the 3.0.0 version.
Using the following parameters to enable Ethernet.
--mca btl ^openib --mca btl_tcp_if_include 172.29.200.0/22
<http://172.29.200.0/22>
The slowdown is significant and I cannot explain why. Infiniband seems
to be working fine. I ran some benchmarks on IB and it performs as
expected.
Thanks,
Supun..
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