feat(transfer_engine): improve topology logging messages

- Update auto-discovery completion log message for clarity
- Add topology details logging after discovery
- Log custom topology details during transport installation

Signed-off-by: staryxchen <[email protected]>

Author: staryxchen

mooncake-transfer-engine/src/topology.cpp

@@ -203,10 +203,9 @@ static std::vector<TopologyEntry> discoverCudaTopology(
                 avail_hca.push_back(hca.name);
             }
         }
-        topology.push_back(
-            TopologyEntry{.name = "cuda:" + std::to_string(i),
-                          .preferred_hca = std::move(preferred_hca),
-                          .avail_hca = std::move(avail_hca)});
+        topology.push_back(TopologyEntry{.name = "cuda:" + std::to_string(i),
+                                         .preferred_hca = preferred_hca,
+                                         .avail_hca = avail_hca});
         topology.push_back(
             TopologyEntry{.name = "gpu:" + std::to_string(i),
                           .preferred_hca = std::move(preferred_hca),

mooncake-transfer-engine/src/transfer_engine.cpp

@@ -150,8 +150,9 @@ int TransferEngine::init(const std::string &metadata_conn_string,
         } else {
             local_topology_->discover(filter_);
         }
-        LOG(INFO) << "Topology discovery complete. Found "
+        LOG(INFO) << "Auto-discovering topology complete: Found "
                   << local_topology_->getHcaList().size() << " HCAs.";
+        LOG(INFO) << "Topology:\n" << local_topology_->toString();
 
 #ifdef USE_MNNVL
         if (local_topology_->getHcaList().size() > 0 &&
@@ -215,6 +216,7 @@ Transport *TransferEngine::installTransport(const std::string &proto,
             LOG(ERROR) << "Failed to parse NIC priority matrix";
             return nullptr;
         }
+        LOG(INFO) << "Install transport " << proto << " with custom topology:\n" << local_topology_->toString();
     }
 
     transport = multi_transports_->installTransport(proto, local_topology_);