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cmd/geth: cap cache allowance

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rjl493456442 authored and karalabe committed May 25, 2018
1 parent b659718 commit a20cc75b4a2982917db83370cadd40e26d1b35b6
Showing with 20 additions and 0 deletions.
  1. +20 −0 cmd/geth/main.go
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@@ -19,12 +19,16 @@ package main
import (
"fmt"
"math"
"os"
"runtime"
godebug "runtime/debug"
"sort"
"strconv"
"strings"
"time"
"github.com/elastic/gosigar"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/cmd/utils"
@@ -188,6 +192,22 @@ func init() {
if err := debug.Setup(ctx); err != nil {
return err
}
// Cap the cache allowance and tune the garbage colelctor
var mem gosigar.Mem
if err := mem.Get(); err == nil {
allowance := int(mem.Total / 1024 / 1024 / 3)
if cache := ctx.GlobalInt(utils.CacheFlag.Name); cache > allowance {
log.Warn("Sanitizing cache to Go's GC limits", "provided", cache, "updated", allowance)
ctx.GlobalSet(utils.CacheFlag.Name, strconv.Itoa(allowance))
}
}
// Ensure Go's GC ignores the database cache for trigger percentage
cache := ctx.GlobalInt(utils.CacheFlag.Name)
gogc := math.Max(20, math.Min(100, 100/(float64(cache)/1024)))
log.Debug("Sanitizing Go's GC trigger", "percent", int(gogc))
godebug.SetGCPercent(int(gogc))
// Start system runtime metrics collection
go metrics.CollectProcessMetrics(3 * time.Second)

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