diff --git a/bsc/garlic/default.nix b/bsc/garlic/default.nix
index c22f3b0..aa5ff95 100644
--- a/bsc/garlic/default.nix
+++ b/bsc/garlic/default.nix
@@ -6,9 +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/default.nix { };
-    ppong = callPackage ./ppong/default.nix { };
+
+    mpptest = callPackage ./mpptest { };
+
+    ppong = callPackage ./ppong { };
+
+    exp = {
+      mpiImpl = callPackage ./experiments {
+        apps = genApps [ ppong ] (
+          genConfigs {
+            mpi = [ bsc.intel-mpi pkgs.mpich pkgs.openmpi ];
+          }
+        );
+      };
+    };
   };
+
 in
   garlic
diff --git a/bsc/garlic/experiments/config.nix b/bsc/garlic/experiments/config.nix
new file mode 100644
index 0000000..7681a8c
--- /dev/null
+++ b/bsc/garlic/experiments/config.nix
@@ -0,0 +1,61 @@
+let
+  lib = import <nixpkgs/lib>;
+
+  inputParams = {
+    # MPI implementation
+    mpi = [
+      "impi"
+      "mpich"
+    ];
+
+    # Gcc compiler
+    gcc = [
+      "gcc9"
+      "gcc7"
+    ];
+
+    # Additional cflags
+    cflags = [
+      ["-O3" "-fnobugs"]
+      ["-Ofast"]
+    ];
+
+    # Which git branches
+#    branches = [
+#      "mpi+seq"
+#      "seq"
+#    ];
+  };
+
+  apps = [
+    "dummy"
+  ];
+
+  # genAttrSets "a" ["hello" "world"]
+  # [ { a = "hello"; } { a = "world"; } ]
+  genAttrSets = (name: arr: (map (x: {${name}=x; })) arr);
+
+  # addAttrSets "a" [1 2] {e=4;}
+  # [ { a = 1; e = 4; } { a = 2; e = 4; } ]
+  addAttrSets = (name: arr: set: (map (x: set // {${name}=x; })) arr);
+
+  # attrToList {a=1;}
+  # [ { name = "a"; value = 1; } ]
+  attrToList = (set: map (name: {name=name; value=set.${name};} ) (builtins.attrNames set));
+
+  # mergeConfig [{e=1;}] {name="a"; value=[1 2]
+  # [ { a = 1; e = 1; } { a = 2; e = 1; } ]
+  mergeConfig = (arr: new: lib.flatten ( map (x: addAttrSets new.name new.value x) arr));
+
+  # genConfigs {a=[1 2]; b=[3 4];}
+  # [ { a = 1; b = 3; } { a = 1; b = 4; } { a = 2; b = 3; } { a = 2; b = 4; } ]
+  genConfigs = (config: lib.foldl mergeConfig [{}] (attrToList config));
+
+
+  # Generates all configs from inputParams
+  allConfigs = (genConfigs inputParams);
+
+in 
+  {
+    inherit allConfigs;
+  }
diff --git a/bsc/garlic/experiments/default.nix b/bsc/garlic/experiments/default.nix
new file mode 100644
index 0000000..64754e1
--- /dev/null
+++ b/bsc/garlic/experiments/default.nix
@@ -0,0 +1,39 @@
+{
+  stdenv
+, mpi
+, fetchurl
+, apps
+}:
+
+stdenv.mkDerivation {
+  name = "garlic-experiments";
+
+  src = ./.;
+
+  buildInputs = [] ++ apps;
+  apps = apps;
+
+  buildPhase = ''
+    for app in $apps; do
+      test -e $app/bin/run || (echo $app/bin/run not found; exit 1)
+    done
+  '';
+
+  installPhase = ''
+    mkdir -p $out/apps
+    for app in $apps; do
+      ln -s $app $out/apps/$(basename $app)
+    done
+
+    mkdir -p $out/bin
+    cat > $out/bin/run <<EOF
+    #!/bin/bash
+
+    for app in $out/apps/*; do
+      \$app/bin/run
+    done
+    EOF
+
+    chmod +x $out/bin/run
+  '';
+}
diff --git a/bsc/garlic/gen.nix b/bsc/garlic/gen.nix
new file mode 100644
index 0000000..adac866
--- /dev/null
+++ b/bsc/garlic/gen.nix
@@ -0,0 +1,34 @@
+let
+  lib = import <nixpkgs/lib>;
+
+  gen = rec {
+    # genAttrSets "a" ["hello" "world"]
+    # [ { a = "hello"; } { a = "world"; } ]
+    genAttrSets = (name: arr: (map (x: {${name}=x; })) arr);
+
+    # addAttrSets "a" [1 2] {e=4;}
+    # [ { a = 1; e = 4; } { a = 2; e = 4; } ]
+    addAttrSets = (name: arr: set: (map (x: set // {${name}=x; })) arr);
+
+    # attrToList {a=1;}
+    # [ { name = "a"; value = 1; } ]
+    attrToList = (set: map (name: {name=name; value=set.${name};} ) (builtins.attrNames set));
+
+    # mergeConfig [{e=1;}] {name="a"; value=[1 2]
+    # [ { a = 1; e = 1; } { a = 2; e = 1; } ]
+    mergeConfig = (arr: new: lib.flatten ( map (x: addAttrSets new.name new.value x) arr));
+
+    # genConfigs {a=[1 2]; b=[3 4];}
+    # [ { a = 1; b = 3; } { a = 1; b = 4; } { a = 2; b = 3; } { a = 2; b = 4; } ]
+    genConfigs = (config: lib.foldl mergeConfig [{}] (attrToList config));
+
+    # Generate multiple app versions by override with each config
+    genApp = (app: configs: map (conf: app.override conf) configs);
+
+    # Generate app version from an array of apps
+    genApps = (apps: configs:
+      lib.flatten (map (app: genApp app configs) apps));
+
+  };
+in
+  gen
diff --git a/bsc/garlic/ppong/default.nix b/bsc/garlic/ppong/default.nix
index 89cdcdc..2a4c399 100644
--- a/bsc/garlic/ppong/default.nix
+++ b/bsc/garlic/ppong/default.nix
@@ -12,12 +12,22 @@ stdenv.mkDerivation {
     sha256 = "0d1w72gq9627448cb7ykknhgp2wszwd117dlbalbrpf7d0la8yc0";
   };
 
-  dontUnpack = true;
+  unpackCmd = ''
+    mkdir src
+    cp $src src/ppong.c
+  '';
+
+  dontConfigure = true;
 
   buildPhase = ''
-    pwd
-    ls -la
-    mpicc PPong.c -o ppong
+    echo mpicc -include stdlib.h ppong.c -o ppong
+    mpicc -include stdlib.h ppong.c -o ppong
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp ppong $out/bin/ppong
+    ln -s $out/bin/ppong $out/bin/run
   '';
 
   buildInputs = [ mpi ];