Bitcoin Core  21.99.0
P2P Digital Currency
mempool_eviction.cpp
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1 // Copyright (c) 2011-2020 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
5 #include <bench/bench.h>
6 #include <policy/policy.h>
7 #include <test/util/setup_common.h>
8 #include <txmempool.h>
9 
10 
11 static void AddTx(const CTransactionRef& tx, const CAmount& nFee, CTxMemPool& pool) EXCLUSIVE_LOCKS_REQUIRED(cs_main, pool.cs)
12 {
13  int64_t nTime = 0;
14  unsigned int nHeight = 1;
15  bool spendsCoinbase = false;
16  unsigned int sigOpCost = 4;
18  pool.addUnchecked(CTxMemPoolEntry(
19  tx, nFee, nTime, nHeight,
21 }
22 
23 // Right now this is only testing eviction performance in an extremely small
24 // mempool. Code needs to be written to generate a much wider variety of
25 // unique transactions for a more meaningful performance measurement.
26 static void MempoolEviction(benchmark::Bench& bench)
27 {
28  const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();
29 
31  tx1.vin.resize(1);
32  tx1.vin[0].scriptSig = CScript() << OP_1;
33  tx1.vin[0].scriptWitness.stack.push_back({1});
34  tx1.vout.resize(1);
35  tx1.vout[0].scriptPubKey = CScript() << OP_1 << OP_EQUAL;
36  tx1.vout[0].nValue = 10 * COIN;
37 
39  tx2.vin.resize(1);
40  tx2.vin[0].scriptSig = CScript() << OP_2;
41  tx2.vin[0].scriptWitness.stack.push_back({2});
42  tx2.vout.resize(1);
43  tx2.vout[0].scriptPubKey = CScript() << OP_2 << OP_EQUAL;
44  tx2.vout[0].nValue = 10 * COIN;
45 
47  tx3.vin.resize(1);
48  tx3.vin[0].prevout = COutPoint(tx2.GetHash(), 0);
49  tx3.vin[0].scriptSig = CScript() << OP_2;
50  tx3.vin[0].scriptWitness.stack.push_back({3});
51  tx3.vout.resize(1);
52  tx3.vout[0].scriptPubKey = CScript() << OP_3 << OP_EQUAL;
53  tx3.vout[0].nValue = 10 * COIN;
54 
56  tx4.vin.resize(2);
57  tx4.vin[0].prevout.SetNull();
58  tx4.vin[0].scriptSig = CScript() << OP_4;
59  tx4.vin[0].scriptWitness.stack.push_back({4});
60  tx4.vin[1].prevout.SetNull();
61  tx4.vin[1].scriptSig = CScript() << OP_4;
62  tx4.vin[1].scriptWitness.stack.push_back({4});
63  tx4.vout.resize(2);
64  tx4.vout[0].scriptPubKey = CScript() << OP_4 << OP_EQUAL;
65  tx4.vout[0].nValue = 10 * COIN;
66  tx4.vout[1].scriptPubKey = CScript() << OP_4 << OP_EQUAL;
67  tx4.vout[1].nValue = 10 * COIN;
68 
70  tx5.vin.resize(2);
71  tx5.vin[0].prevout = COutPoint(tx4.GetHash(), 0);
72  tx5.vin[0].scriptSig = CScript() << OP_4;
73  tx5.vin[0].scriptWitness.stack.push_back({4});
74  tx5.vin[1].prevout.SetNull();
75  tx5.vin[1].scriptSig = CScript() << OP_5;
76  tx5.vin[1].scriptWitness.stack.push_back({5});
77  tx5.vout.resize(2);
78  tx5.vout[0].scriptPubKey = CScript() << OP_5 << OP_EQUAL;
79  tx5.vout[0].nValue = 10 * COIN;
80  tx5.vout[1].scriptPubKey = CScript() << OP_5 << OP_EQUAL;
81  tx5.vout[1].nValue = 10 * COIN;
82 
84  tx6.vin.resize(2);
85  tx6.vin[0].prevout = COutPoint(tx4.GetHash(), 1);
86  tx6.vin[0].scriptSig = CScript() << OP_4;
87  tx6.vin[0].scriptWitness.stack.push_back({4});
88  tx6.vin[1].prevout.SetNull();
89  tx6.vin[1].scriptSig = CScript() << OP_6;
90  tx6.vin[1].scriptWitness.stack.push_back({6});
91  tx6.vout.resize(2);
92  tx6.vout[0].scriptPubKey = CScript() << OP_6 << OP_EQUAL;
93  tx6.vout[0].nValue = 10 * COIN;
94  tx6.vout[1].scriptPubKey = CScript() << OP_6 << OP_EQUAL;
95  tx6.vout[1].nValue = 10 * COIN;
96 
98  tx7.vin.resize(2);
99  tx7.vin[0].prevout = COutPoint(tx5.GetHash(), 0);
100  tx7.vin[0].scriptSig = CScript() << OP_5;
101  tx7.vin[0].scriptWitness.stack.push_back({5});
102  tx7.vin[1].prevout = COutPoint(tx6.GetHash(), 0);
103  tx7.vin[1].scriptSig = CScript() << OP_6;
104  tx7.vin[1].scriptWitness.stack.push_back({6});
105  tx7.vout.resize(2);
106  tx7.vout[0].scriptPubKey = CScript() << OP_7 << OP_EQUAL;
107  tx7.vout[0].nValue = 10 * COIN;
108  tx7.vout[1].scriptPubKey = CScript() << OP_7 << OP_EQUAL;
109  tx7.vout[1].nValue = 10 * COIN;
110 
111  CTxMemPool pool;
112  LOCK2(cs_main, pool.cs);
113  // Create transaction references outside the "hot loop"
114  const CTransactionRef tx1_r{MakeTransactionRef(tx1)};
115  const CTransactionRef tx2_r{MakeTransactionRef(tx2)};
116  const CTransactionRef tx3_r{MakeTransactionRef(tx3)};
117  const CTransactionRef tx4_r{MakeTransactionRef(tx4)};
118  const CTransactionRef tx5_r{MakeTransactionRef(tx5)};
119  const CTransactionRef tx6_r{MakeTransactionRef(tx6)};
120  const CTransactionRef tx7_r{MakeTransactionRef(tx7)};
121 
122  bench.run([&]() NO_THREAD_SAFETY_ANALYSIS {
123  AddTx(tx1_r, 10000LL, pool);
124  AddTx(tx2_r, 5000LL, pool);
125  AddTx(tx3_r, 20000LL, pool);
126  AddTx(tx4_r, 7000LL, pool);
127  AddTx(tx5_r, 1000LL, pool);
128  AddTx(tx6_r, 1100LL, pool);
129  AddTx(tx7_r, 9000LL, pool);
130  pool.TrimToSize(pool.DynamicMemoryUsage() * 3 / 4);
132  });
133 }
134 
LOCK2
#define LOCK2(cs1, cs2)
Definition: sync.h:233
policy.h
MempoolEviction
static void MempoolEviction(benchmark::Bench &bench)
Definition: mempool_eviction.cpp:26
CMutableTransaction::vin
std::vector< CTxIn > vin
Definition: transaction.h:346
nHeight
unsigned int nHeight
Definition: mempool_eviction.cpp:14
OP_7
@ OP_7
Definition: script.h:82
CTxMemPool
CTxMemPool stores valid-according-to-the-current-best-chain transactions that may be included in the ...
Definition: txmempool.h:477
CTxMemPool::TrimToSize
void TrimToSize(size_t sizelimit, std::vector< COutPoint > *pvNoSpendsRemaining=nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs)
Remove transactions from the mempool until its dynamic size is <= sizelimit.
Definition: txmempool.cpp:1040
ankerl::nanobench::Bench
Main entry point to nanobench's benchmarking facility.
Definition: nanobench.h:583
MakeTransactionRef
static CTransactionRef MakeTransactionRef(Tx &&txIn)
Definition: transaction.h:387
CTransactionRef
std::shared_ptr< const CTransaction > CTransactionRef
Definition: transaction.h:386
cs_main
RecursiveMutex cs_main
Mutex to guard access to validation specific variables, such as reading or changing the chainstate.
Definition: validation.cpp:131
txmempool.h
NO_THREAD_SAFETY_ANALYSIS
#define NO_THREAD_SAFETY_ANALYSIS
Definition: threadsafety.h:51
OP_6
@ OP_6
Definition: script.h:81
CTxMemPool::cs
RecursiveMutex cs
This mutex needs to be locked when accessing mapTx or other members that are guarded by it.
Definition: txmempool.h:565
OP_3
@ OP_3
Definition: script.h:78
ankerl::nanobench::Bench::run
Bench & run(char const *benchmarkName, Op &&op)
Repeatedly calls op() based on the configuration, and performs measurements.
Definition: nanobench.h:1134
CAmount
int64_t CAmount
Amount in satoshis (Can be negative)
Definition: amount.h:12
OP_2
@ OP_2
Definition: script.h:77
OP_4
@ OP_4
Definition: script.h:79
CScript
Serialized script, used inside transaction inputs and outputs.
Definition: script.h:404
bench.h
OP_5
@ OP_5
Definition: script.h:80
CMutableTransaction::vout
std::vector< CTxOut > vout
Definition: transaction.h:347
BENCHMARK
BENCHMARK(MempoolEviction)
EXCLUSIVE_LOCKS_REQUIRED
#define EXCLUSIVE_LOCKS_REQUIRED(...)
Definition: threadsafety.h:49
CTxMemPoolEntry
Definition: txmempool.h:81
LockPoints
Definition: txmempool.h:39
OP_EQUAL
@ OP_EQUAL
Definition: script.h:138
spendsCoinbase
bool spendsCoinbase
Definition: mempool_eviction.cpp:15
COIN
static const CAmount COIN
Definition: amount.h:14
CTxMemPool::DynamicMemoryUsage
size_t DynamicMemoryUsage() const
Definition: txmempool.cpp:937
COutPoint
An outpoint - a combination of a transaction hash and an index n into its vout.
Definition: transaction.h:26
AddTx
static void AddTx(const CTransactionRef &tx, const CAmount &nFee, CTxMemPool &pool) EXCLUSIVE_LOCKS_REQUIRED(cs_main
lp
LockPoints lp
Definition: mempool_eviction.cpp:17
CMutableTransaction::GetHash
uint256 GetHash() const
Compute the hash of this CMutableTransaction.
Definition: transaction.cpp:62
CMutableTransaction
A mutable version of CTransaction.
Definition: transaction.h:344
GetVirtualTransactionSize
int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost, unsigned int bytes_per_sigop)
Compute the virtual transaction size (weight reinterpreted as bytes).
Definition: policy.cpp:280
OP_1
@ OP_1
Definition: script.h:75
sigOpCost
unsigned int sigOpCost
Definition: mempool_eviction.cpp:16