cmd, core/state: allow configurable trie cache generations

cmd/geth/chaincmd.go

@@ -99,6 +99,7 @@ func importChain(ctx *cli.Context) error {
 			utils.Fatalf("Failed to read database stats: %v", err)
 		}
 		fmt.Println(stats)
+		fmt.Printf("Trie cache misses: %d\n\n", trie.CacheMisses())
 
 		// Compact the entire database to more accurately measure disk io and print the stats
 		start = time.Now()
@@ -113,7 +114,6 @@ func importChain(ctx *cli.Context) error {
 			utils.Fatalf("Failed to read database stats: %v", err)
 		}
 		fmt.Println(stats)
-		fmt.Println("Trie cache misses:", trie.CacheMisses())
 	}
 	return nil
 }

cmd/geth/main.go

@@ -134,8 +134,9 @@ participating.
 		utils.KeyStoreDirFlag,
 		utils.OlympicFlag,
 		utils.FastSyncFlag,
-		utils.CacheFlag,
 		utils.LightKDFFlag,
+		utils.CacheFlag,
+		utils.TrieCacheGenFlag,
 		utils.JSpathFlag,
 		utils.ListenPortFlag,
 		utils.MaxPeersFlag,

cmd/geth/usage.go

@@ -73,7 +73,13 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.IdentityFlag,
 			utils.FastSyncFlag,
 			utils.LightKDFFlag,
+		},
+	},
+	{
+		Name: "PERFORMANCE TUNING",
+		Flags: []cli.Flag{
 			utils.CacheFlag,
+			utils.TrieCacheGenFlag,
 		},
 	},
 	{