[libfabric-users] FI_EP_DGRAM using fi_verbs provider

[Niyaz Murshed]

This seems to work.

Server: fi_rma_bw -s   192.168.2.200  -d mlx5_0-dgram -p verbs
Client : fi_rma_bw -s   192.168.2.100  -d mlx5_2-dgram  192.168.2.200  -p verbs



From: Libfabric-users <libfabric-users-bounces at lists.openfabrics.org> on behalf of Anders Dam Jensen <anders at damjensen.name>
Date: Sunday, August 11, 2024 at 4:25 AM
To: libfabric-users at lists.openfabrics.org <libfabric-users at lists.openfabrics.org>
Subject: [libfabric-users] FI_EP_DGRAM using fi_verbs provider
Hi Libfabric community,

Can anyone point me to an example of how to use DGRAM with the fi_verbs provider?

I have no problem getting DGRAM to work with the fi_udp provider, but when I move the code to verbs, the address resolution fails.

I can see that DGRAM supports/needs FI_ADDR_IB_UD, but I am unable to add such addresses to the AV.

Furthermore, the verbs provider doc refers to variables specific to DGRAM endpoints:

FI_VERBS_DGRAM_USE_NAME_SERVER:  The option that enables/disables OFI Name Server thread. The NS thread is used to resolve IP-addresses to provider specific addresses (default: 1, if “OMPI_COMM_WORLD_RANK” and “PMI_RANK” environment variables aren’t defined)
FI_VERBS_NAME_SERVER_PORT: The port on which Name Server thread listens incoming connections and requests (default: 5678)

This makes it sound like ip address resolution should work, but I cannot find any documentation on this.

Thanks Anders

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