[libfabric-users] connection-less send/recv with verbs

[Maurizio Drocco]

Hello,

I am facing an issue with the “verbs” provider, whereas the same code works at least with the “sockets” provider.

The scenario:
The code is an all-to-all network of processes, with connection-less send/recv communication.
All addresses and services are known statically at start time.
Each process has an endpoint, to which it posts both send and recv requests (via fi_send/fi_recv); the endpoint is created from a fabric that is created by passing its address, its service and FI_SOURCE flag to fi_getinfo.
Then each process fills an AV table with address/service of all the other nodes.

The problem:
With verbs, the code crashes on the first call to fi_recv, with the following call stack:
fi_recv - fi_ibv_rdm_recv - fi_ibv_rdm_recvmsg - fi_ibv_rdm_init_recv_request

Do you have any idea about what is going on? If it helps, I can recompile libfabric with some options for debugging.

Thank you for any help or suggestion,
Maurizio

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Maurizio Drocco
PhD Candidate
University of Torino, department of Computer Science
Via Pessinetto 12, 10149 Torino - Italy