src/bench/ccoins_caching.cpp

   1 // Copyright (c) 2016 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.h"
   6 #include "coins.h"
   7 #include "policy/policy.h"
   8 #include "wallet/crypter.h"
   9
  10 #include <vector>
  11
  12 // FIXME: Dedup with SetupDummyInputs in test/transaction_tests.cpp.
  13 //
  14 // Helper: create two dummy transactions, each with
  15 // two outputs.  The first has 11 and 50 CENT outputs
  16 // paid to a TX_PUBKEY, the second 21 and 22 CENT outputs
  17 // paid to a TX_PUBKEYHASH.
  18 //
  19 static std::vector<CMutableTransaction>
  20 SetupDummyInputs(CBasicKeyStore& keystoreRet, CCoinsViewCache& coinsRet)
  21 {
  22     std::vector<CMutableTransaction> dummyTransactions;
  23     dummyTransactions.resize(2);
  24
  25     // Add some keys to the keystore:
  26     CKey key[4];
  27     for (int i = 0; i < 4; i++) {
  28         key[i].MakeNewKey(i % 2);
  29         keystoreRet.AddKey(key[i]);
  30     }
  31
  32     // Create some dummy input transactions
  33     dummyTransactions[0].vout.resize(2);
  34     dummyTransactions[0].vout[0].nValue = 11 * CENT;
  35     dummyTransactions[0].vout[0].scriptPubKey << ToByteVector(key[0].GetPubKey()) << OP_CHECKSIG;
  36     dummyTransactions[0].vout[1].nValue = 50 * CENT;
  37     dummyTransactions[0].vout[1].scriptPubKey << ToByteVector(key[1].GetPubKey()) << OP_CHECKSIG;
  38     coinsRet.ModifyCoins(dummyTransactions[0].GetHash())->FromTx(dummyTransactions[0], 0);
  39
  40     dummyTransactions[1].vout.resize(2);
  41     dummyTransactions[1].vout[0].nValue = 21 * CENT;
  42     dummyTransactions[1].vout[0].scriptPubKey = GetScriptForDestination(key[2].GetPubKey().GetID());
  43     dummyTransactions[1].vout[1].nValue = 22 * CENT;
  44     dummyTransactions[1].vout[1].scriptPubKey = GetScriptForDestination(key[3].GetPubKey().GetID());
  45     coinsRet.ModifyCoins(dummyTransactions[1].GetHash())->FromTx(dummyTransactions[1], 0);
  46
  47     return dummyTransactions;
  48 }
  49
  50 // Microbenchmark for simple accesses to a CCoinsViewCache database. Note from
  51 // laanwj, "replicating the actual usage patterns of the client is hard though,
  52 // many times micro-benchmarks of the database showed completely different
  53 // characteristics than e.g. reindex timings. But that's not a requirement of
  54 // every benchmark."
  55 // (https://github.com/bitcoin/bitcoin/issues/7883#issuecomment-224807484)
  56 static void CCoinsCaching(benchmark::State& state)
  57 {
  58     CBasicKeyStore keystore;
  59     CCoinsView coinsDummy;
  60     CCoinsViewCache coins(&coinsDummy);
  61     std::vector<CMutableTransaction> dummyTransactions = SetupDummyInputs(keystore, coins);
  62
  63     CMutableTransaction t1;
  64     t1.vin.resize(3);
  65     t1.vin[0].prevout.hash = dummyTransactions[0].GetHash();
  66     t1.vin[0].prevout.n = 1;
  67     t1.vin[0].scriptSig << std::vector<unsigned char>(65, 0);
  68     t1.vin[1].prevout.hash = dummyTransactions[1].GetHash();
  69     t1.vin[1].prevout.n = 0;
  70     t1.vin[1].scriptSig << std::vector<unsigned char>(65, 0) << std::vector<unsigned char>(33, 4);
  71     t1.vin[2].prevout.hash = dummyTransactions[1].GetHash();
  72     t1.vin[2].prevout.n = 1;
  73     t1.vin[2].scriptSig << std::vector<unsigned char>(65, 0) << std::vector<unsigned char>(33, 4);
  74     t1.vout.resize(2);
  75     t1.vout[0].nValue = 90 * CENT;
  76     t1.vout[0].scriptPubKey << OP_1;
  77
  78     // Benchmark.
  79     while (state.KeepRunning()) {
  80         bool success = AreInputsStandard(t1, coins);
  81         assert(success);
  82         CAmount value = coins.GetValueIn(t1);
  83         assert(value == (50 + 21 + 22) * CENT);
  84     }
  85 }
  86
  87 BENCHMARK(CCoinsCaching);