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59 lines
2.1 KiB
Go
59 lines
2.1 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser 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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//
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// The go-ethereum library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"github.com/ledgerwatch/turbo-geth/params"
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)
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// CalcGasLimit computes the gas limit of the next block after parent. It aims
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// to keep the baseline gas above the provided floor, and increase it towards the
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// ceil if the blocks are full. If the ceil is exceeded, it will always decrease
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// the gas allowance.
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func CalcGasLimit(parentGasUsed, parentGasLimit, gasFloor, gasCeil uint64) uint64 {
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// contrib = (parentGasUsed * 3 / 2) / 1024
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contrib := (parentGasUsed + parentGasUsed/2) / params.GasLimitBoundDivisor
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// decay = parentGasLimit / 1024 -1
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decay := parentGasLimit/params.GasLimitBoundDivisor - 1
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/*
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strategy: gasLimit of block-to-mine is set based on parent's
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gasUsed value. if parentGasUsed > parentGasLimit * (2/3) then we
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increase it, otherwise lower it (or leave it unchanged if it's right
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at that usage) the amount increased/decreased depends on how far away
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from parentGasLimit * (2/3) parentGasUsed is.
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*/
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limit := parentGasLimit - decay + contrib
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if limit < params.MinGasLimit {
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limit = params.MinGasLimit
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}
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// If we're outside our allowed gas range, we try to hone towards them
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if limit < gasFloor {
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limit = parentGasLimit + decay
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if limit > gasFloor {
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limit = gasFloor
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}
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} else if limit > gasCeil {
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limit = parentGasLimit - decay
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if limit < gasCeil {
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limit = gasCeil
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}
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}
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return limit
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}
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