diff --git a/doc/examples/clusters/gricad/README.md b/doc/examples/clusters/gricad/README.md
index e90eabc9..35bc2d9f 100644
--- a/doc/examples/clusters/gricad/README.md
+++ b/doc/examples/clusters/gricad/README.md
@@ -47,11 +47,22 @@ python3 -m venv ~/venv-fluidsim-guix --system-site-packages
 . ~/venv-fluidsim-guix/bin/activate
 cd ~/dev/fluidsim
 pip install -e lib
-pip install -e ".[test]" -v --config-settings=setup-args=-Dnative=true
+pip install -e ".[test]" -v --config-settings=setup-args=-Dnative=true --no-build-isolation
 ```
 
 ## Test Fluidsim in sequential
 
 ```sh
-python -m pytest --pyargs fluidsim
+source /applis/site/guix-start.sh
+guix shell -m ~/dev/fluidsim/doc/examples/clusters/gricad/manifest.scm
+. ~/venv-fluidsim-guix/bin/activate
+cd ~/dev/fluidsim
+python -m pytest fluidsim
+```
+
+## Submit a fluidfft benchmark
+
+```sh
+cd ~/dev/fluidsim/doc/examples/clusters/gricad/
+oarsub -S ./job_fluidfft_bench.oar
 ```
diff --git a/doc/examples/clusters/gricad/instructions_fluidfft_bench.sh b/doc/examples/clusters/gricad/instructions_fluidfft_bench.sh
new file mode 100755
index 00000000..49391aaf
--- /dev/null
+++ b/doc/examples/clusters/gricad/instructions_fluidfft_bench.sh
@@ -0,0 +1,7 @@
+
+source $HOME/venv-fluidsim-guix/bin/activate
+
+mpirun -np `cat machinefile | wc -l` \
+    --machinefile machinefile \
+    --prefix $1 \
+    fluidfft-bench 256 -d 3
diff --git a/doc/examples/clusters/gricad/job_fluidfft_bench.oar b/doc/examples/clusters/gricad/job_fluidfft_bench.oar
new file mode 100755
index 00000000..843a2d35
--- /dev/null
+++ b/doc/examples/clusters/gricad/job_fluidfft_bench.oar
@@ -0,0 +1,23 @@
+#!/bin/bash
+#OAR -n bench_fluidfft
+#OAR --stdout fluidfft.out
+#OAR --stderr fluidfft.err
+#OAR -t devel
+#OAR -l /nodes=1/core=2,walltime=00:30:00
+#OAR --project pr-strat-turb
+
+# load guix session
+source /applis/site/guix-start.sh
+
+export OMPI_MCA_plm_rsh_agent=/usr/bin/oarsh
+export OMPI_MCA_btl_openib_allow_ib=true
+export OMPI_MCA_pml=cm
+export OMPI_MCA_mtl=psm2
+
+ENV="`guix shell -m manifest.scm -- /bin/sh -c 'echo $GUIX_ENVIRONMENT'`"
+
+cat $OAR_FILE_NODES > ./machinefile
+
+exec ~/.config/guix/current/bin/guix shell -E ^OMPI -E ^OAR -E ^OMP \
+    -m manifest.scm \
+    -- ./instructions_fluidfft_bench.sh $ENV