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// Copyright (c) 2012-2017 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 <wallet/wallet.h>
#include <set>
static void addCoin(const CAmount& nValue, const CWallet& wallet, std::vector<COutput>& vCoins)
{
int nInput = 0;
static int nextLockTime = 0;
CMutableTransaction tx;
tx.nLockTime = nextLockTime++; // so all transactions get different hashes
tx.vout.resize(nInput + 1);
tx.vout[nInput].nValue = nValue;
CWalletTx* wtx = new CWalletTx(&wallet, MakeTransactionRef(std::move(tx)));
int nAge = 6 * 24;
COutput output(wtx, nInput, nAge, true /* spendable */, true /* solvable */, true /* safe */);
vCoins.push_back(output);
}
// Simple benchmark for wallet coin selection. Note that it maybe be necessary
// to build up more complicated scenarios in order to get meaningful
// measurements of performance. From laanwj, "Wallet coin selection is probably
// the hardest, as you need a wider selection of scenarios, just testing the
// same one over and over isn't too useful. Generating random isn't useful
// either for measurements."
// (https://github.com/bitcoin/bitcoin/issues/7883#issuecomment-224807484)
static void CoinSelection(benchmark::State& state)
{
const CWallet wallet("dummy", CWalletDBWrapper::CreateDummy());
std::vector<COutput> vCoins;
LOCK(wallet.cs_wallet);
while (state.KeepRunning()) {
// Add coins.
for (int i = 0; i < 1000; i++)
addCoin(1000 * COIN, wallet, vCoins);
addCoin(3 * COIN, wallet, vCoins);
std::set<CInputCoin> setCoinsRet;
CAmount nValueRet;
CoinEligibilityFilter filter_standard(1, 6, 0);
bool success = wallet.SelectCoinsMinConf(1003 * COIN, filter_standard, vCoins, setCoinsRet, nValueRet);
assert(success);
assert(nValueRet == 1003 * COIN);
assert(setCoinsRet.size() == 2);
// Empty wallet.
for (COutput& output : vCoins) {
delete output.tx;
}
vCoins.clear();
}
}
BENCHMARK(CoinSelection, 650);
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