Add extrae and perf stages

bsc/garlic/statspy.nix

@@ -0,0 +1,29 @@
+{
+  stdenv
+, bash
+}:
+
+{
+  app
+, outputDir ? "."
+, program ? "bin/run"
+}:
+
+stdenv.mkDerivation {
+  name = "${app.name}-statspy";
+  preferLocalBuild = true;
+  phases = [ "installPhase" ];
+  installPhase = ''
+    mkdir -p $out/bin
+    cat > $out/bin/run <<EOF
+    #!${bash}/bin/bash
+
+    mkdir -p ${outputDir}
+    cat /proc/[0-9]*/stat | sort -n > ${outputDir}/statspy.\$(date +%s.%3N).begin
+    ${app}/${program}
+    cat /proc/[0-9]*/stat | sort -n > ${outputDir}/statspy.\$(date +%s.%3N).end
+
+    EOF
+    chmod +x $out/bin/run
+  '';
+}