Add global-profile option

Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

cmd/lotus-bench/import.go

@@ -80,6 +80,10 @@ var importBenchCmd = &cli.Command{
 		&cli.BoolFlag{
 			Name: "only-gc",
 		},
+		&cli.BoolFlag{
+			Name:  "global-profile",
+			Value: true,
+		},
 		&cli.Int64Flag{
 			Name: "start-at",
 		},
@@ -161,6 +165,7 @@ var importBenchCmd = &cli.Command{
 		cs := store.NewChainStore(bs, ds, vm.Syscalls(verifier))
 		stm := stmgr.NewStateManager(cs)
 
+		if cctx.Bool("global-profile") {
 			prof, err := os.Create("import-bench.prof")
 			if err != nil {
 				return err
@@ -170,6 +175,7 @@ var importBenchCmd = &cli.Command{
 			if err := pprof.StartCPUProfile(prof); err != nil {
 				return err
 			}
+		}
 
 		var head *types.TipSet
 		if !cctx.Bool("no-import") {