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// Copyright (c) 2016-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <bench/bench.h>
#include <coins.h>
#include <policy/policy.h>
#include <script/signingprovider.h>
#include <vector>
// FIXME: Dedup with SetupDummyInputs in test/transaction_tests.cpp.
//
// Helper: create two dummy transactions, each with
// two outputs. The first has 11 and 50 COIN outputs
// paid to a TX_PUBKEY, the second 21 and 22 COIN outputs
// paid to a TX_PUBKEYHASH.
//
static std::vector<CMutableTransaction>
SetupDummyInputs(FillableSigningProvider& keystoreRet, CCoinsViewCache& coinsRet)
{
std::vector<CMutableTransaction> dummyTransactions;
dummyTransactions.resize(2);
// Add some keys to the keystore:
CKey key[4];
for (int i = 0; i < 4; i++) {
key[i].MakeNewKey(i % 2);
keystoreRet.AddKey(key[i]);
}
// Create some dummy input transactions
dummyTransactions[0].vout.resize(2);
dummyTransactions[0].vout[0].nValue = 11 * COIN;
dummyTransactions[0].vout[0].scriptPubKey << ToByteVector(key[0].GetPubKey()) << OP_CHECKSIG;
dummyTransactions[0].vout[1].nValue = 50 * COIN;
dummyTransactions[0].vout[1].scriptPubKey << ToByteVector(key[1].GetPubKey()) << OP_CHECKSIG;
AddCoins(coinsRet, CTransaction(dummyTransactions[0]), 0);
dummyTransactions[1].vout.resize(2);
dummyTransactions[1].vout[0].nValue = 21 * COIN;
dummyTransactions[1].vout[0].scriptPubKey = GetScriptForDestination(PKHash(key[2].GetPubKey()));
dummyTransactions[1].vout[1].nValue = 22 * COIN;
dummyTransactions[1].vout[1].scriptPubKey = GetScriptForDestination(PKHash(key[3].GetPubKey()));
AddCoins(coinsRet, CTransaction(dummyTransactions[1]), 0);
return dummyTransactions;
}
// Microbenchmark for simple accesses to a CCoinsViewCache database. Note from
// laanwj, "replicating the actual usage patterns of the client is hard though,
// many times micro-benchmarks of the database showed completely different
// characteristics than e.g. reindex timings. But that's not a requirement of
// every benchmark."
// (https://github.com/bitcoin/bitcoin/issues/7883#issuecomment-224807484)
static void CCoinsCaching(benchmark::State& state)
{
FillableSigningProvider keystore;
CCoinsView coinsDummy;
CCoinsViewCache coins(&coinsDummy);
std::vector<CMutableTransaction> dummyTransactions = SetupDummyInputs(keystore, coins);
CMutableTransaction t1;
t1.vin.resize(3);
t1.vin[0].prevout.hash = dummyTransactions[0].GetHash();
t1.vin[0].prevout.n = 1;
t1.vin[0].scriptSig << std::vector<unsigned char>(65, 0);
t1.vin[1].prevout.hash = dummyTransactions[1].GetHash();
t1.vin[1].prevout.n = 0;
t1.vin[1].scriptSig << std::vector<unsigned char>(65, 0) << std::vector<unsigned char>(33, 4);
t1.vin[2].prevout.hash = dummyTransactions[1].GetHash();
t1.vin[2].prevout.n = 1;
t1.vin[2].scriptSig << std::vector<unsigned char>(65, 0) << std::vector<unsigned char>(33, 4);
t1.vout.resize(2);
t1.vout[0].nValue = 90 * COIN;
t1.vout[0].scriptPubKey << OP_1;
// Benchmark.
const CTransaction tx_1(t1);
while (state.KeepRunning()) {
bool success = AreInputsStandard(tx_1, coins);
assert(success);
CAmount value = coins.GetValueIn(tx_1);
assert(value == (50 + 21 + 22) * COIN);
}
}
BENCHMARK(CCoinsCaching, 170 * 1000);
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