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Old   February 22, 2021, 03:03
Default Open MPI warning
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Guillaume Beardsell
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I am getting this warning in run.log when I start a simulation:

A high-performance Open MPI point-to-point messaging module
was unable to find any relevant network interfaces:

Module: OpenFabrics (openib)
Host: ip-10-0-0-42

Another transport will be used instead, although this may result in
lower performance.

NOTE: You can disable this warning by setting the MCA parameter
btl_base_warn_component_unused to 0.

Should I worry about it? Will this slow down my calculations as implied? I am running my simulations on AWS EC2 instances (one instance, multiple processors).

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Old   February 22, 2021, 12:19
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Kislaya Srivastava
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Hello Guillaume,

This warning can be safely ignored. It's just saying it is unable to find any InfiniBand interconnect hardware. CONVERGE 3.0 works best with a high-performance interconnect such as InfiniBand or Omni-Path. But this is expected on an AWS server, and not relevant for a single-node simulation in any case.

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Kislaya Srivastava
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