cmd, consensus: add option to disable mmap for DAG caches/datasets (#20484)

* cmd, consensus: add option to disable mmap for DAG caches/datasets

* consensus: add benchmarks for mmap with/with lock

cmd/geth/main.go

@@ -74,9 +74,11 @@ var (
 		utils.EthashCacheDirFlag,
 		utils.EthashCachesInMemoryFlag,
 		utils.EthashCachesOnDiskFlag,
+		utils.EthashCachesLockMmapFlag,
 		utils.EthashDatasetDirFlag,
 		utils.EthashDatasetsInMemoryFlag,
 		utils.EthashDatasetsOnDiskFlag,
+		utils.EthashDatasetsLockMmapFlag,
 		utils.TxPoolLocalsFlag,
 		utils.TxPoolNoLocalsFlag,
 		utils.TxPoolJournalFlag,

cmd/geth/retesteth.go

@@ -387,11 +387,13 @@ func (api *RetestethAPI) SetChainParams(ctx context.Context, chainParams ChainPa
 		inner = ethash.NewFaker()
 	case "Ethash":
 		inner = ethash.New(ethash.Config{
-			CacheDir:       "ethash",
-			CachesInMem:    2,
-			CachesOnDisk:   3,
-			DatasetsInMem:  1,
-			DatasetsOnDisk: 2,
+			CacheDir:         "ethash",
+			CachesInMem:      2,
+			CachesOnDisk:     3,
+			CachesLockMmap:   false,
+			DatasetsInMem:    1,
+			DatasetsOnDisk:   2,
+			DatasetsLockMmap: false,
 		}, nil, false)
 	default:
 		return false, fmt.Errorf("unrecognised seal engine: %s", chainParams.SealEngine)

cmd/geth/usage.go

@@ -109,9 +109,11 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.EthashCacheDirFlag,
 			utils.EthashCachesInMemoryFlag,
 			utils.EthashCachesOnDiskFlag,
+			utils.EthashCachesLockMmapFlag,
 			utils.EthashDatasetDirFlag,
 			utils.EthashDatasetsInMemoryFlag,
 			utils.EthashDatasetsOnDiskFlag,
+			utils.EthashDatasetsLockMmapFlag,
 		},
 	},
 	{