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Merge #13011: Cache witness hash in CTransaction

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fac1223a56 Cache witness hash in CTransaction (MarcoFalke)
faab55fbb1 Make CMutableTransaction constructor explicit (MarcoFalke)

Pull request description:

  This speeds up:
  * compactblocks (v2)
  * ATMP
  * validation and miner (via `BlockWitnessMerkleRoot`)
  * sigcache (see also unrelated #13204)
  * rpc and rest (nice, but irrelevant)

  This presumably slows down rescan, which uses a `CTransaction` and its `GetHash`, but never uses the `GetWitnessHash`. The slow down is proportional to the number of witness transactions in the rescan window. I.e. early in the chain there should be no measurable slow down. Later in the chain, there should be a slow down, but acceptable given the speedups in the modules mentioned above.

Tree-SHA512: 443e86acfcceb5af2163e68840c581d44159af3fd1fce266cab3504b29fcd74c50812b69a00d41582e7e1c5ea292f420ce5e892cdfab691da9c24ed1c44536c7
This commit is contained in:
Wladimir J. van der Laan
2018-05-23 19:04:25 +02:00
parent b9551d3663 fac1223a56
commit 3c2a41a9fc
8 changed files with 21 additions and 23 deletions
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2
src/wallet/feebumper.cpp
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@@ -185,7 +185,7 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin
// If the output is not large enough to pay the fee, fail.
CAmount nDelta = new_fee - old_fee;
assert(nDelta > 0);
mtx = *wtx.tx;
mtx = CMutableTransaction{*wtx.tx};
CTxOut* poutput = &(mtx.vout[nOutput]);
if (poutput->nValue < nDelta) {
errors.push_back("Change output is too small to bump the fee");