simulate staker preference

core/block_validator_test.go

@@ -18,6 +18,7 @@ package core
 
 import (
 	"math/big"
+	"math/rand"
 	"testing"
 	"time"
 
@@ -265,3 +266,40 @@ func TestCalcGasLimit(t *testing.T) {
 		}
 	}
 }
+
+func TestSimulateGasLimit(t *testing.T) {
+	minLimit, maxLimit := params.MinGasLimit, params.MaxGasLimit // can change these
+	params.MinGasLimit, params.MaxGasLimit = minLimit, maxLimit
+	rand.Seed(time.Now().UnixNano())
+
+	type weightedPreference struct {
+		weight float32
+		limit  uint64
+	}
+	stakerPreference := []weightedPreference{
+		{0.1, 100_000},
+		{0.1, 200_000},
+		{0.1, 300_000},
+		{0.1, 400_000},
+		{0.1, 500_000},
+		{0.1, 600_000},
+		{0.1, 700_000},
+		{0.1, 800_000},
+		{0.1, 900_000},
+		{0.1, 1_000_000},
+	}
+
+	start := params.MinGasLimit
+	currentGasLimit := start
+	for i := 0; i < 100_000; i++ {
+		r := rand.Float32()
+		for _, p := range stakerPreference {
+			r -= p.weight
+			if r <= 0 {
+				currentGasLimit = CalcGasLimit(currentGasLimit, p.limit)
+				break
+			}
+		}
+		t.Logf("Gas limit: %d", currentGasLimit)
+	}
+}

params/protocol_params.go

@@ -22,11 +22,14 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 )
 
+var (
+	MinGasLimit uint64 = 5000               // Minimum the gas limit may ever be.
+	MaxGasLimit uint64 = 0x7fffffffffffffff // Maximum the gas limit (2^63-1).
+)
+
 const (
-	GasLimitBoundDivisor uint64 = 1024               // The bound divisor of the gas limit, used in update calculations.
+	GasLimitBoundDivisor uint64 = 1024    // The bound divisor of the gas limit, used in update calculations.
-	MinGasLimit          uint64 = 5000               // Minimum the gas limit may ever be.
+	GenesisGasLimit      uint64 = 4712388 // Gas limit of the Genesis block.
-	MaxGasLimit          uint64 = 0x7fffffffffffffff // Maximum the gas limit (2^63-1).
-	GenesisGasLimit      uint64 = 4712388            // Gas limit of the Genesis block.
 
 	MaximumExtraDataSize  uint64 = 32    // Maximum size extra data may be after Genesis.
 	ExpByteGas            uint64 = 10    // Times ceil(log256(exponent)) for the EXP instruction.