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96 lines
2.5 KiB
96 lines
2.5 KiB
9 years ago
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/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file BasicGasPricer.cpp
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* @author Gav Wood <i@gavwood.com>
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* @date 2015
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*/
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#include <boost/math/distributions/normal.hpp>
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#include "BasicGasPricer.h"
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#include "BlockChain.h"
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using namespace std;
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using namespace dev;
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using namespace dev::eth;
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void BasicGasPricer::update(BlockChain const& _bc)
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{
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unsigned c = 0;
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h256 p = _bc.currentHash();
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m_gasPerBlock = _bc.info(p).gasLimit;
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map<u256, u256> dist;
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u256 total = 0;
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// make gasPrice versus gasUsed distribution for the last 1000 blocks
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while (c < 1000 && p)
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{
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BlockInfo bi = _bc.info(p);
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if (bi.transactionsRoot != EmptyTrie)
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{
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auto bb = _bc.block(p);
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RLP r(bb);
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BlockReceipts brs(_bc.receipts(bi.hash()));
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size_t i = 0;
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for (auto const& tr: r[1])
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{
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Transaction tx(tr.data(), CheckTransaction::None);
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u256 gu = brs.receipts[i].gasUsed();
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dist[tx.gasPrice()] += gu;
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total += gu;
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i++;
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}
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}
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p = bi.parentHash;
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++c;
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}
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// fill m_octiles with weighted gasPrices
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if (total > 0)
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{
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m_octiles[0] = dist.begin()->first;
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// calc mean
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u256 mean = 0;
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for (auto const& i: dist)
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mean += i.first * i.second;
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mean /= total;
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// calc standard deviation
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u256 sdSquared = 0;
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for (auto const& i: dist)
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sdSquared += i.second * (i.first - mean) * (i.first - mean);
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sdSquared /= total;
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if (sdSquared)
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{
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long double sd = sqrt(sdSquared.convert_to<long double>());
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long double normalizedSd = sd / mean.convert_to<long double>();
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// calc octiles normalized to gaussian distribution
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boost::math::normal gauss(1.0, (normalizedSd > 0.01) ? normalizedSd : 0.01);
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for (size_t i = 1; i < 8; i++)
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m_octiles[i] = u256(mean.convert_to<long double>() * boost::math::quantile(gauss, i / 8.0));
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m_octiles[8] = dist.rbegin()->first;
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}
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else
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{
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for (size_t i = 0; i < 9; i++)
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m_octiles[i] = (i + 1) * mean / 5;
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}
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}
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}
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