[OMPI users] --with-mpi-f90-size in openmpi-3.0.2

[Zeinab Salah]

Hi everyone,
I have  a problem in running an air quality model, maybe because of the
size of calculations, so I tried different versions of openmpi.
I want to install openmpi-3.0.2 with the option of
"--with-mpi-f90-size=medium", but this option is unrecognized in the new
versions. So, what is the update option for that, or how we can control the
size of the MPI F90 module in the new versions?, also, does this option
make the numerical models to deal with lagre data files?

Thank you in advance.
Best regards,
Zeinab
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Re: [OMPI users] RDMA over Ethernet in Open MPI - RoCE on AWS?

[Benjamin Brock]

In case anyone comes across this thread in an attempt to get RDMA over
Ethernet working on AWS, here's the conclusion I came to:

There are two kinds of NICs exposed to VMs on AWS:

  - Intel 82599 VF
- This NIC is old and does not support RoCE or iWARP.
- It's a virtualized view of an actual Intel 82599 Ethernet Controller.
- On C3, C4, D2, I2, M4 (excluding m4.16xlarge), and R3 instances.

 - Elastic Network Adapter (ENA)
- This is a virtual NIC without a RoCE or iWARP driver, and as far as I
can tell, does not have a RoCE or iWARP driver.
- I'm not sure which hardware NICs this is virtualizing, but without an
ENA RoCE driver, AWS VMs will not be able to use RoCE, regardless of
whether the hardware NIC supports it.
- On C5, C5d, F1, G3, H1, I3, m4.16xlarge, M5, M5d, P2, P3, R4, R5,
R5d, T3, X1, X1e, and z1d instances.

Ben
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