-build_vpp_ubuntu_amd64 "NEW" || die
-prepare_build_parent || die
-build_vpp_ubuntu_amd64 "PARENT" || die
-prepare_test || die
-## Replace previous 4 lines with this to speed up testing.
-#download_builds "https://jenkins.fd.io/sandbox/job/vpp-csit-verify-perf-master-2n-skx/2/artifact/*zip*/archive.zip" || die
-initialize_csit_dirs || die
-get_test_tag_string || die
+git status || die
+git describe || die
+build_vpp_ubuntu "CURRENT" || die
+set_aside_build_artifacts "current" || die
+git checkout "HEAD~" || die "Failed to checkout parent commit."
+git status || die
+git describe || die
+build_vpp_ubuntu "PARENT" || die
+set_aside_build_artifacts "parent" || die
+initialize_csit_dirs "parent" "current" || die