config: Sane default parallel sector read defaults

cmd/lotus-worker/main.go

@@ -196,7 +196,7 @@ var runCmd = &cli.Command{
 		&cli.IntFlag{
 			Name:  "post-parallel-reads",
 			Usage: "maximum number of parallel challenge reads (0 = no limit)",
-			Value: 0,
+			Value: 128,
 		},
 		&cli.DurationFlag{
 			Name:  "post-read-timeout",

documentation/en/cli-lotus-worker.md

@@ -50,7 +50,7 @@ OPTIONS:
    --windowpost                  enable window post (default: false)
    --winningpost                 enable winning post (default: false)
    --parallel-fetch-limit value  maximum fetch operations to run in parallel (default: 5)
-   --post-parallel-reads value   maximum number of parallel challenge reads (0 = no limit) (default: 0)
+   --post-parallel-reads value   maximum number of parallel challenge reads (0 = no limit) (default: 128)
    --post-read-timeout value     time limit for reading PoSt challenges (0 = no limit) (default: 0s)
    --timeout value               used when 'listen' is unspecified. must be a valid duration recognized by golang's time.ParseDuration function (default: "30m")
    --help, -h                    show help (default: false)

documentation/en/default-lotus-miner-config.toml

@@ -311,7 +311,7 @@
   #
   # type: int
   # env var: LOTUS_PROVING_PARALLELCHECKLIMIT
-  #ParallelCheckLimit = 0
+  #ParallelCheckLimit = 128
 
 
 [Sealing]

node/config/def.go

@@ -138,6 +138,10 @@ func DefaultStorageMiner() *StorageMiner {
 			TerminateBatchWait: Duration(5 * time.Minute),
 		},
 
+		Proving: ProvingConfig{
+			ParallelCheckLimit: 128,
+		},
+
 		Storage: SealerConfig{
 			AllowAddPiece:            true,
 			AllowPreCommit1:          true,