Inside Bitcoin

1// Copyright (c) 2016-present 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 <coins.h>
7#include <consensus/amount.h>
8#include <consensus/validation.h>
9#include <key.h>
10#include <policy/policy.h>
11#include <primitives/transaction.h>
12#include <script/script.h>
13#include <script/signingprovider.h>
14#include <test/util/transaction_utils.h>
15#include <util/check.h>
16
17#include <array>
18#include <span>
19#include <vector>
20
21// Microbenchmark for simple accesses to a CCoinsViewCache database. Note from
22// laanwj, "replicating the actual usage patterns of the client is hard though,
23// many times micro-benchmarks of the database showed completely different
24// characteristics than e.g. reindex timings. But that's not a requirement of
25// every benchmark."
26// (https://github.com/bitcoin/bitcoin/issues/7883#issuecomment-224807484)
27static void CCoinsCaching(benchmark::Bench& bench)
28{
29    ECC_Context ecc_context{};
30
31    FillableSigningProvider keystore;
32    CCoinsViewCache coins{&CoinsViewEmpty::Get()};
33    std::vector<CMutableTransaction> dummyTransactions =
34        SetupDummyInputs(keystore, coins, {11 * COIN, 50 * COIN, 21 * COIN, 22 * COIN});
35
36    CMutableTransaction t1;
37    t1.vin.resize(3);
38    t1.vin[0].prevout.hash = dummyTransactions[0].GetHash();
39    t1.vin[0].prevout.n = 1;
40    t1.vin[0].scriptSig << std::vector<unsigned char>(65, 0);
41    t1.vin[1].prevout.hash = dummyTransactions[1].GetHash();
42    t1.vin[1].prevout.n = 0;
43    t1.vin[1].scriptSig << std::vector<unsigned char>(65, 0) << std::vector<unsigned char>(33, 4);
44    t1.vin[2].prevout.hash = dummyTransactions[1].GetHash();
45    t1.vin[2].prevout.n = 1;
46    t1.vin[2].scriptSig << std::vector<unsigned char>(65, 0) << std::vector<unsigned char>(33, 4);
47    t1.vout.resize(2);
48    t1.vout[0].nValue = 90 * COIN;
49    t1.vout[0].scriptPubKey << OP_1;
50
51    // Benchmark.
52    const CTransaction tx_1(t1);
53    bench.run([&] {
54        assert(ValidateInputsStandardness(tx_1, coins).IsValid());
55    });
56}
57
58BENCHMARK(CCoinsCaching);
59