drop vAddrToSend after sending big addr message

We send a newly-accepted peer a 1000-entry addr message, and then only use
vAddrToSend for small messages. Deallocate vAddrToSend after it's been used for
the big message to save about 40 kB per connected inbound peer.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/main.cpp b/src/main.cpp
index fc8e72a7db..5fff4187ac 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -5713,6 +5713,9 @@ bool SendMessages(CNode* pto)
             pto->vAddrToSend.clear();
             if (!vAddr.empty())
                 pto->PushMessage(NetMsgType::ADDR, vAddr);
+            // we only send the big addr message once
+            if (pto->vAddrToSend.capacity() > 40)
+                pto->vAddrToSend.shrink_to_fit();
         }
 
         CNodeState &state = *State(pto->GetId());