diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f0f494a9807095317044795d41acd15d935db249..d57d7218a2a714e783ba70e0e45c4cebf3f886a1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,24 +1,30 @@
 image: ralfjung/opam-ci:latest
 
-gps-coq8.6:
+variables:
+  CPU_CORES: "9"
+
+iris-coq8.6:
   tags:
-  - coq
+  - fp-timing
   script:
-  # prepare
+  # prepare 
   - cd coq
-  - . build/opam-ci.sh 'coq 8.6' 'coq-mathcomp-ssreflect dev'
+  - . build/opam-ci.sh 'coq 8.6' 'coq-mathcomp-ssreflect 1.6.1'
+  - env | egrep '^(CI_BUILD_REF|CI_RUNNER)' > build-env.txt
   # build
-  - 'time make -j8 TIMED=y 2>&1 | tee build-log-full.txt'
-  - 'if fgrep Axiom build-log-full.txt >/dev/null; then exit 1; fi'
-  - 'cat build-log-full.txt  | egrep "[a-zA-Z0-9_/-]+ \(user: [0-9]" | tee build-time-full.txt'
+  - 'time make -j$CPU_CORES TIMED=y 2>&1 | tee build-log.txt'
+  - 'if fgrep Axiom build-log.txt >/dev/null; then exit 1; fi'
+  - 'cat build-log.txt | egrep "[a-zA-Z0-9_/-]+ \(user: [0-9]" | tee build-time.txt'
+  - 'if (( RANDOM % 10 == 0 )); then make validate; fi'
   cache:
     key: "coq8.6"
     paths:
-    - coq/opamroot/
+    - opamroot/
   only:
   - master
   - /^bench-.*$/
   - opam-ci
   artifacts:
     paths:
-    - build-time.txt
\ No newline at end of file
+    - build-time.txt
+    - build-env.txt