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Implement accurate memory accounting for mempool

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This commit is contained in:
Pieter Wuille 2015-07-09 13:56:31 -04:00
parent 943b322d5d
commit 5098c47b24
8 changed files with 110 additions and 2 deletions
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67
src/memusage.h
View file

@ -11,6 +11,7 @@
#include <set>
#include <vector>
#include <boost/foreach.hpp>
#include <boost/unordered_set.hpp>
#include <boost/unordered_map.hpp>
@ -20,12 +21,28 @@ namespace memusage
/** Compute the total memory used by allocating alloc bytes. */
static size_t MallocUsage(size_t alloc);
/** Dynamic memory usage for built-in types is zero. */
static inline size_t DynamicUsage(const int8_t& v) { return 0; }
static inline size_t DynamicUsage(const uint8_t& v) { return 0; }
static inline size_t DynamicUsage(const int16_t& v) { return 0; }
static inline size_t DynamicUsage(const uint16_t& v) { return 0; }
static inline size_t DynamicUsage(const int32_t& v) { return 0; }
static inline size_t DynamicUsage(const uint32_t& v) { return 0; }
static inline size_t DynamicUsage(const int64_t& v) { return 0; }
static inline size_t DynamicUsage(const uint64_t& v) { return 0; }
static inline size_t DynamicUsage(const float& v) { return 0; }
static inline size_t DynamicUsage(const double& v) { return 0; }
template<typename X> static inline size_t DynamicUsage(X * const &v) { return 0; }
template<typename X> static inline size_t DynamicUsage(const X * const &v) { return 0; }
template<typename X, typename Y> static inline size_t DynamicUsage(std::pair<X, Y> &p) { return 0; }
/** Compute the memory used for dynamically allocated but owned data structures.
* For generic data types, this is *not* recursive. DynamicUsage(vector<vector<int> >)
* will compute the memory used for the vector<int>'s, but not for the ints inside.
* This is for efficiency reasons, as these functions are intended to be fast. If
* application data structures require more accurate inner accounting, they should
* do the recursion themselves, or use more efficient caching + updating on modification.
* use RecursiveDynamicUsage, iterate themselves, or use more efficient caching +
* updating on modification.
*/
template<typename X> static size_t DynamicUsage(const std::vector<X>& v);
template<typename X> static size_t DynamicUsage(const std::set<X>& s);
@ -34,6 +51,12 @@ template<typename X, typename Y> static size_t DynamicUsage(const boost::unorder
template<typename X, typename Y, typename Z> static size_t DynamicUsage(const boost::unordered_map<X, Y, Z>& s);
template<typename X> static size_t DynamicUsage(const X& x);
template<typename X> static size_t RecursiveDynamicUsage(const std::vector<X>& v);
template<typename X> static size_t RecursiveDynamicUsage(const std::set<X>& v);
template<typename X, typename Y> static size_t RecursiveDynamicUsage(const std::map<X, Y>& v);
template<typename X, typename Y> static size_t RecursiveDynamicUsage(const std::pair<X, Y>& v);
template<typename X> static size_t RecursiveDynamicUsage(const X& v);
static inline size_t MallocUsage(size_t alloc)
{
// Measured on libc6 2.19 on Linux.
@ -65,18 +88,54 @@ static inline size_t DynamicUsage(const std::vector<X>& v)
return MallocUsage(v.capacity() * sizeof(X));
}
template<typename X>
static inline size_t RecursiveDynamicUsage(const std::vector<X>& v)
{
size_t usage = DynamicUsage(v);
BOOST_FOREACH(const X& x, v) {
usage += RecursiveDynamicUsage(x);
}
return usage;
}
template<typename X>
static inline size_t DynamicUsage(const std::set<X>& s)
{
return MallocUsage(sizeof(stl_tree_node<X>)) * s.size();
}
template<typename X>
static inline size_t RecursiveDynamicUsage(const std::set<X>& v)
{
size_t usage = DynamicUsage(v);
BOOST_FOREACH(const X& x, v) {
usage += RecursiveDynamicUsage(x);
}
return usage;
}
template<typename X, typename Y>
static inline size_t DynamicUsage(const std::map<X, Y>& m)
{
return MallocUsage(sizeof(stl_tree_node<std::pair<const X, Y> >)) * m.size();
}
template<typename X, typename Y>
static inline size_t RecursiveDynamicUsage(const std::map<X, Y>& v)
{
size_t usage = DynamicUsage(v);
for (typename std::map<X, Y>::const_iterator it = v.begin(); it != v.end(); it++) {
usage += RecursiveDynamicUsage(*it);
}
return usage;
}
template<typename X, typename Y>
static inline size_t RecursiveDynamicUsage(const std::pair<X, Y>& v)
{
return RecursiveDynamicUsage(v.first) + RecursiveDynamicUsage(v.second);
}
// Boost data structures
template<typename X>
@ -106,6 +165,12 @@ static inline size_t DynamicUsage(const X& x)
return x.DynamicMemoryUsage();
}
template<typename X>
static inline size_t RecursiveDynamicUsage(const X& x)
{
return DynamicUsage(x);
}
}
#endif

5
src/primitives/transaction.cpp
View file

@ -72,6 +72,11 @@ void CTransaction::UpdateHash() const
*const_cast<uint256*>(&hash) = SerializeHash(*this);
}
size_t CTransaction::DynamicMemoryUsage() const
{
return memusage::RecursiveDynamicUsage(vin) + memusage::RecursiveDynamicUsage(vout);
}
CTransaction::CTransaction() : nVersion(CTransaction::CURRENT_VERSION), vin(), vout(), nLockTime(0) { }
CTransaction::CTransaction(const CMutableTransaction &tx) : nVersion(tx.nVersion), vin(tx.vin), vout(tx.vout), nLockTime(tx.nLockTime) {

9
src/primitives/transaction.h
View file

@ -7,6 +7,7 @@
#define BITCOIN_PRIMITIVES_TRANSACTION_H
#include "amount.h"
#include "memusage.h"
#include "script/script.h"
#include "serialize.h"
#include "uint256.h"
@ -48,6 +49,8 @@ public:
}
std::string ToString() const;
size_t DynamicMemoryUsage() const { return 0; }
};
/** An input of a transaction. It contains the location of the previous
@ -96,6 +99,8 @@ public:
}
std::string ToString() const;
size_t DynamicMemoryUsage() const { return scriptSig.DynamicMemoryUsage(); }
};
/** An output of a transaction. It contains the public key that the next input
@ -166,6 +171,8 @@ public:
}
std::string ToString() const;
size_t DynamicMemoryUsage() const { return scriptPubKey.DynamicMemoryUsage(); }
};
struct CMutableTransaction;
@ -249,6 +256,8 @@ public:
}
std::string ToString() const;
size_t DynamicMemoryUsage() const;
};
/** A mutable version of CTransaction. */

2
src/rpcblockchain.cpp
View file

@ -758,6 +758,7 @@ UniValue getmempoolinfo(const UniValue& params, bool fHelp)
"{\n"
" \"size\": xxxxx (numeric) Current tx count\n"
" \"bytes\": xxxxx (numeric) Sum of all tx sizes\n"
" \"usage\": xxxxx (numeric) Total memory usage for the mempool\n"
"}\n"
"\nExamples:\n"
+ HelpExampleCli("getmempoolinfo", "")
@ -767,6 +768,7 @@ UniValue getmempoolinfo(const UniValue& params, bool fHelp)
UniValue ret(UniValue::VOBJ);
ret.push_back(Pair("size", (int64_t) mempool.size()));
ret.push_back(Pair("bytes", (int64_t) mempool.GetTotalTxSize()));
ret.push_back(Pair("usage", (int64_t) mempool.DynamicMemoryUsage()));
return ret;
}

5
src/script/script.cpp
View file

@ -260,3 +260,8 @@ std::string CScript::ToString() const
}
return str;
}
size_t CScript::DynamicMemoryUsage() const
{
return memusage::DynamicUsage(*(static_cast<const std::vector<unsigned char>*>(this)));
}

3
src/script/script.h
View file

@ -6,6 +6,7 @@
#ifndef BITCOIN_SCRIPT_SCRIPT_H
#define BITCOIN_SCRIPT_SCRIPT_H
#include "memusage.h"
#include "crypto/common.h"
#include <assert.h>
@ -607,6 +608,8 @@ public:
// The default std::vector::clear() does not release memory.
std::vector<unsigned char>().swap(*this);
}
size_t DynamicMemoryUsage() const;
};
class CReserveScript

14
src/txmempool.cpp
View file

@ -18,7 +18,7 @@
using namespace std;
CTxMemPoolEntry::CTxMemPoolEntry():
nFee(0), nTxSize(0), nModSize(0), nTime(0), dPriority(0.0), hadNoDependencies(false)
nFee(0), nTxSize(0), nModSize(0), nUsageSize(0), nTime(0), dPriority(0.0), hadNoDependencies(false)
{
nHeight = MEMPOOL_HEIGHT;
}
@ -31,6 +31,7 @@ CTxMemPoolEntry::CTxMemPoolEntry(const CTransaction& _tx, const CAmount& _nFee,
{
nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
nModSize = tx.CalculateModifiedSize(nTxSize);
nUsageSize = tx.DynamicMemoryUsage();
}
CTxMemPoolEntry::CTxMemPoolEntry(const CTxMemPoolEntry& other)
@ -101,6 +102,7 @@ bool CTxMemPool::addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry,
mapNextTx[tx.vin[i].prevout] = CInPoint(&tx, i);
nTransactionsUpdated++;
totalTxSize += entry.GetTxSize();
cachedInnerUsage += entry.DynamicMemoryUsage();
minerPolicyEstimator->processTransaction(entry, fCurrentEstimate);
return true;
@ -146,6 +148,7 @@ void CTxMemPool::remove(const CTransaction &origTx, std::list<CTransaction>& rem
removed.push_back(tx);
totalTxSize -= mapTx[hash].GetTxSize();
cachedInnerUsage -= mapTx[hash].DynamicMemoryUsage();
mapTx.erase(hash);
nTransactionsUpdated++;
minerPolicyEstimator->removeTx(hash);
@ -226,6 +229,7 @@ void CTxMemPool::clear()
mapTx.clear();
mapNextTx.clear();
totalTxSize = 0;
cachedInnerUsage = 0;
++nTransactionsUpdated;
}
@ -237,6 +241,7 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
LogPrint("mempool", "Checking mempool with %u transactions and %u inputs\n", (unsigned int)mapTx.size(), (unsigned int)mapNextTx.size());
uint64_t checkTotal = 0;
uint64_t innerUsage = 0;
CCoinsViewCache mempoolDuplicate(const_cast<CCoinsViewCache*>(pcoins));
@ -245,6 +250,7 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
for (std::map<uint256, CTxMemPoolEntry>::const_iterator it = mapTx.begin(); it != mapTx.end(); it++) {
unsigned int i = 0;
checkTotal += it->second.GetTxSize();
innerUsage += it->second.DynamicMemoryUsage();
const CTransaction& tx = it->second.GetTx();
bool fDependsWait = false;
BOOST_FOREACH(const CTxIn &txin, tx.vin) {
@ -299,6 +305,7 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
}
assert(totalTxSize == checkTotal);
assert(innerUsage == cachedInnerUsage);
}
void CTxMemPool::queryHashes(vector<uint256>& vtxid)
@ -419,3 +426,8 @@ bool CCoinsViewMemPool::GetCoins(const uint256 &txid, CCoins &coins) const {
bool CCoinsViewMemPool::HaveCoins(const uint256 &txid) const {
return mempool.exists(txid) || base->HaveCoins(txid);
}
size_t CTxMemPool::DynamicMemoryUsage() const {
LOCK(cs);
return memusage::DynamicUsage(mapTx) + memusage::DynamicUsage(mapNextTx) + memusage::DynamicUsage(mapDeltas) + cachedInnerUsage;
}

7
src/txmempool.h
View file

@ -40,6 +40,7 @@ private:
CAmount nFee; //! Cached to avoid expensive parent-transaction lookups
size_t nTxSize; //! ... and avoid recomputing tx size
size_t nModSize; //! ... and modified size for priority
size_t nUsageSize; //! ... and total memory usage
int64_t nTime; //! Local time when entering the mempool
double dPriority; //! Priority when entering the mempool
unsigned int nHeight; //! Chain height when entering the mempool
@ -58,6 +59,7 @@ public:
int64_t GetTime() const { return nTime; }
unsigned int GetHeight() const { return nHeight; }
bool WasClearAtEntry() const { return hadNoDependencies; }
size_t DynamicMemoryUsage() const { return nUsageSize; }
};
class CBlockPolicyEstimator;
@ -73,6 +75,7 @@ public:
CInPoint(const CTransaction* ptxIn, uint32_t nIn) { ptx = ptxIn; n = nIn; }
void SetNull() { ptx = NULL; n = (uint32_t) -1; }
bool IsNull() const { return (ptx == NULL && n == (uint32_t) -1); }
size_t DynamicMemoryUsage() const { return 0; }
};
/**
@ -93,6 +96,7 @@ private:
CBlockPolicyEstimator* minerPolicyEstimator;
uint64_t totalTxSize; //! sum of all mempool tx' byte sizes
uint64_t cachedInnerUsage; //! sum of dynamic memory usage of all the map elements (NOT the maps themselves)
public:
mutable CCriticalSection cs;
@ -139,6 +143,7 @@ public:
LOCK(cs);
return mapTx.size();
}
uint64_t GetTotalTxSize()
{
LOCK(cs);
@ -162,6 +167,8 @@ public:
/** Write/Read estimates to disk */
bool WriteFeeEstimates(CAutoFile& fileout) const;
bool ReadFeeEstimates(CAutoFile& filein);
size_t DynamicMemoryUsage() const;
};
/**