support env variables to overwrite toml file

weed/command/benchmark.go

@@ -15,7 +15,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/spf13/viper"
 	"google.golang.org/grpc"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -109,7 +108,7 @@ var (
 func runBenchmark(cmd *Command, args []string) bool {
 
 	util.LoadConfiguration("security", false)
-	b.grpcDialOption = security.LoadClientTLS(viper.Sub("grpc"), "client")
+	b.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")
 
 	fmt.Printf("This is SeaweedFS version %s %s %s\n", util.VERSION, runtime.GOOS, runtime.GOARCH)
 	if *b.maxCpu < 1 {