Add generators for experiments

bsc/garlic/default.nix

@@ -6,19 +6,26 @@
 let
   callPackage = pkgs.lib.callPackageWith (pkgs // bsc // garlic);
   callPackages = pkgs.lib.callPackagesWith (pkgs // bsc // garlic);
+
+  # Load some helper functions to generate app variants
+  inherit (import ./gen.nix) genApps genConfigs;
+
   garlic = rec {
 
     mpptest = callPackage ./mpptest { };
 
     ppong = callPackage ./ppong { };
 
-    experiments = callPackage ./experiments {
-      apps = [
-        (ppong.override { mpi=bsc.intel-mpi;})
-        (ppong.override { mpi=pkgs.mpich;})
-      ];
+    exp = {
+      mpiImpl = callPackage ./experiments {
+        apps = genApps [ ppong ] (
+          genConfigs {
+            mpi = [ bsc.intel-mpi pkgs.mpich pkgs.openmpi ];
+          }
+        );
+      };
     };
-
   };
+
 in
   garlic