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resolve_target

monarch_rdma::backend::ibverbs::device_selection

Function resolve_target 

Source 
pub fn resolve_target<I: IbvDeviceImpl>(
    target: &IbvDeviceTarget,
) -> Result<Option<IbvDeviceInfo>>
Expand description

Resolves an IbvDeviceTarget to a single NIC of backend I: the named device for IbvDeviceTarget::Nic, or the best NIC for a memory location. Both arms are scoped to backend I, so a name belonging to a different backend resolves to Ok(None).

Where several NICs tie for a memory location, this takes the first, which by select_optimal_ibv_devices’s ordering is the lexicographically smallest name. Two processes pinning the same location over the same NICs therefore resolve to the same device.

Ok(None) means “no such device”; an error means the target could not be evaluated at all, which for a GPU location includes CUDA not being initialized in this process.