[DEVOPS-36] Build speedups in following of https://issues.serokell.io…

…/issue/DEVOPS-36#comment=96-3716

default.nix

@@ -11,6 +11,13 @@ let
   });
   socket-io-src = pkgs.fetchgit (removeAttrs (lib.importJSON ./pkgs/engine-io.json) ["date"]);
   cardano-sl-src = pkgs.fetchgit (removeAttrs (lib.importJSON ./pkgs/cardano-sl.json) ["date"]);
+  cores   = 4;
+  threads = 8;
+  buildSubset = subset: drv: overrideCabal drv (drv: {
+    buildTarget = subset;
+  });
+  buildSpeedupFlagsMarlowScaling = drv : appendConfigureFlag drv
+    "--ghc-option=-rtsopts --ghc-option=+RTS --ghc-option=-N${toString threads} --ghc-option=-A128m --ghc-option=-n2m --ghc-option=-qb0 --ghc-option=-qn${toString cores} --ghc-option=-RTS";
 in compiler.override {
   overrides = self: super: {
     # To generate these go to ./pkgs and run ./generate.sh
@@ -62,7 +69,10 @@ in compiler.override {
       # production full nodes shouldn't use wallet as it means different constants
       configureFlags = [ "-f-asserts" "-f-dev-mode" "-fwith-explorer"];
     });
-    cardano-sl-static = justStaticExecutables self.cardano-sl;
+    cardano-sl-static =
+      buildSpeedupFlagsMarlowScaling
+      (buildSubset ("cardano-node")
+       (dontCheck (linkWithGold (justStaticExecutables self.cardano-sl))));
     cardano-report-server-static = justStaticExecutables self.cardano-report-server;
     cardano-sl-explorer-static = justStaticExecutables self.cardano-sl-explorer;