[v5.0.x] ofi: Share domain between MTL and BTL #13463
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Share the domain between the MTL and BTL layers to reduce the total number of domains created. This helps avoid hitting system resource limits on platforms with high core counts.
Instead of having the common code allocate a single domain with the superset of all required capabilities, we attempt to reuse an existing fabric and domain if the providers can support MTL’s and BTL’s different capability sets. This approach allows providers that support domain sharing to reuse resources efficiently while still preserving flexibility. If the providers cannot reuse the fabric and domain due to incompatible requirements, separate domains will be created as before.