parallel GC as default

Author: mgmeier

cardano-node/cardano-node.cabal

@@ -227,7 +227,7 @@ executable cardano-node
   if arch(arm)
     ghc-options:        "-with-rtsopts=-T -I0 -A16m -N1 --disable-delayed-os-memory-return"
   else
-    ghc-options:        "-with-rtsopts=-T -I0 -A16m -N2 --disable-delayed-os-memory-return"
+    ghc-options:        "-with-rtsopts=-T -I0 -A16m -qg1 -qb1 -N2 --disable-delayed-os-memory-return"
 
   other-modules:        Paths_cardano_node
   autogen-modules:      Paths_cardano_node

nix/nixos/cardano-node-service.nix

@@ -833,7 +833,7 @@ in {
 
       rtsArgs = mkOption {
         type = listOf str;
-        default = [ "-N2" "-I0" "-A16m" "-qg" "-qb" "--disable-delayed-os-memory-return" ];
+        default = [ "-N2" "-I0" "-A16m" "-qg1" "-qb1" "--disable-delayed-os-memory-return" ];
         apply = args: if (args != [] || cfg.profilingArgs != [] || cfg.rts_flags_override != []) then
           ["+RTS"] ++ cfg.profilingArgs ++ args ++ cfg.rts_flags_override ++ ["-RTS"]
           else [];