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Replace mruset setAddrKnown with CRollingBloomFilter addrKnown

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Use a probabilistic bloom filter to keep track of which addresses
we think we have given our peers, instead of a list.

This uses much less memory, at the cost of sometimes failing to
relay an address to a peer-- worst case if the bloom filter happens
to be as full as it gets, 1-in-1,000.

Measured memory usage of a full mruset setAddrKnown: 650Kbytes
Constant memory usage of CRollingBloomFilter addrKnown: 37Kbytes.

This will also help heap fragmentation, because the 37K of storage
is allocated when a CNode is created (when a connection to a peer
is established) and then there is no per-item-remembered memory
allocation.

I plan on testing by restarting a full node with an empty peers.dat,
running a while with -debug=addrman and -debug=net, and making sure
that the 'addr' message traffic out is reasonable.
(suggestions for better tests welcome)
This commit is contained in:
Gavin Andresen
2015-04-25 16:25:44 -04:00
committed by Pieter Wuille
parent 69a5f8be0a
commit d81cff32e5
3 changed files with 9 additions and 9 deletions
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10
src/main.cpp
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@@ -3995,7 +3995,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
{
LOCK(cs_vNodes);
// Use deterministic randomness to send to the same nodes for 24 hours
// at a time so the setAddrKnowns of the chosen nodes prevent repeats
// at a time so the addrKnowns of the chosen nodes prevent repeats
static uint256 hashSalt;
if (hashSalt.IsNull())
hashSalt = GetRandHash();
@@ -4779,9 +4779,9 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
{
// Periodically clear setAddrKnown to allow refresh broadcasts
// Periodically clear addrKnown to allow refresh broadcasts
if (nLastRebroadcast)
pnode->setAddrKnown.clear();
pnode->addrKnown.clear();
// Rebroadcast our address
AdvertizeLocal(pnode);
@@ -4799,9 +4799,9 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
vAddr.reserve(pto->vAddrToSend.size());
BOOST_FOREACH(const CAddress& addr, pto->vAddrToSend)
{
// returns true if wasn't already contained in the set
if (pto->setAddrKnown.insert(addr).second)
if (!pto->addrKnown.contains(addr.GetKey()))
{
pto->addrKnown.insert(addr.GetKey());
vAddr.push_back(addr);
// receiver rejects addr messages larger than 1000
if (vAddr.size() >= 1000)