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miner: gas limit strategy, target 3141592 & def gas price 50 Shannon

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This commit is contained in:
Gustav Simonsson 2015-08-03 02:46:34 +02:00
parent ff66e8fa29
commit 26c6e3b206
4 changed files with 22 additions and 8 deletions
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6
cmd/utils/flags.go
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@ -158,7 +158,7 @@ var (
GasPriceFlag = cli.StringFlag{
Name: "gasprice",
Usage: "Sets the minimal gasprice when mining transactions",
Value: new(big.Int).Mul(big.NewInt(500), common.Shannon).String(),
Value: new(big.Int).Mul(big.NewInt(50), common.Shannon).String(),
}
UnlockedAccountFlag = cli.StringFlag{
@ -318,12 +318,12 @@ var (
GpoMinGasPriceFlag = cli.StringFlag{
Name: "gpomin",
Usage: "Minimum suggested gas price",
Value: new(big.Int).Mul(big.NewInt(1), common.Szabo).String(),
Value: new(big.Int).Mul(big.NewInt(50), common.Shannon).String(),
}
GpoMaxGasPriceFlag = cli.StringFlag{
Name: "gpomax",
Usage: "Maximum suggested gas price",
Value: new(big.Int).Mul(big.NewInt(100), common.Szabo).String(),
Value: new(big.Int).Mul(big.NewInt(500), common.Shannon).String(),
}
GpoFullBlockRatioFlag = cli.IntFlag{
Name: "gpofull",

17
core/chain_util.go
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@ -69,17 +69,30 @@ func CalcTD(block, parent *types.Block) *big.Int {
// CalcGasLimit computes the gas limit of the next block after parent.
// The result may be modified by the caller.
// This is miner strategy, not consensus protocol.
func CalcGasLimit(parent *types.Block) *big.Int {
decay := new(big.Int).Div(parent.GasLimit(), params.GasLimitBoundDivisor)
// contrib = (parentGasUsed * 3 / 2) / 1024
contrib := new(big.Int).Mul(parent.GasUsed(), big.NewInt(3))
contrib = contrib.Div(contrib, big.NewInt(2))
contrib = contrib.Div(contrib, params.GasLimitBoundDivisor)
// decay = parentGasLimit / 1024 -1
decay := new(big.Int).Div(parent.GasLimit(), params.GasLimitBoundDivisor)
decay.Sub(decay, big.NewInt(1))
/*
strategy: gasLimit of block-to-mine is set based on parent's
gasUsed value. if parentGasUsed > parentGasLimit * (2/3) then we
increase it, otherwise lower it (or leave it unchanged if it's right
at that usage) the amount increased/decreased depends on how far away
from parentGasLimit * (2/3) parentGasUsed is.
*/
gl := new(big.Int).Sub(parent.GasLimit(), decay)
gl = gl.Add(gl, contrib)
gl = gl.Add(gl, big.NewInt(1))
gl.Set(common.BigMax(gl, params.MinGasLimit))
// however, if we're now below the target (GenesisGasLimit) we increase the
// limit as much as we can (parentGasLimit / 1024 -1)
if gl.Cmp(params.GenesisGasLimit) < 0 {
gl.Add(parent.GasLimit(), decay)
gl.Set(common.BigMin(gl, params.GenesisGasLimit))

3
eth/fetcher/fetcher_test.go
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@ -28,12 +28,13 @@ import (
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/params"
)
var (
testdb, _ = ethdb.NewMemDatabase()
genesis = core.GenesisBlockForTesting(testdb, common.Address{}, big.NewInt(0))
unknownBlock = types.NewBlock(&types.Header{}, nil, nil, nil)
unknownBlock = types.NewBlock(&types.Header{GasLimit: params.GenesisGasLimit}, nil, nil, nil)
)
// makeChain creates a chain of n blocks starting at and including parent.

4
params/protocol_params.go
View File

@ -39,8 +39,8 @@ var (
EcrecoverGas = big.NewInt(3000) //
Sha256WordGas = big.NewInt(12) //
MinGasLimit = big.NewInt(5000) // Minimum the gas limit may ever be.
GenesisGasLimit = big.NewInt(5000) // Gas limit of the Genesis block.
MinGasLimit = big.NewInt(5000) // Minimum the gas limit may ever be.
GenesisGasLimit = big.NewInt(3141592) // Gas limit of the Genesis block.
Sha3Gas = big.NewInt(30) // Once per SHA3 operation.
Sha256Gas = big.NewInt(60) //