s/StressAppTest/stressapptest_CurrentWatts.sh: custom SLEEP_TIME

This complements d01fda39.

s/StressAppTest/stressapptest_CurrentWatts.sh

@@ -21,11 +21,21 @@ fi
 NODE=$(hostname -s)
 CURRENTWATTS_IDLE=$(get_CurrentWatts)
 CURRENTWATTS_HIGHEST=${CURRENTWATTS_IDLE}
-SLEEP_TIME=5
+SLEEP_TIME=$(expr \
+              $(grep -e 'JobAcctGatherFrequency' /etc/slurm/slurm.conf | \
+                 sed -e 's/^.*energy=//g') \
+              + \
+              $(awk -F"=" '/^EnergyIPMIFrequency/ {print $2}' /etc/slurm/acct_gather.conf))
 
 
 ## main
-echo "W: waiting ${SLEEP_TIME} seconds before getting the idle value..."
+cat <<EOF
+W: waiting ${SLEEP_TIME} seconds before getting the idle value..."
+   (this correspond to the sum of energy values in:
+     - /etc/slurm/slurm.conf:JobAcctGatherFrequency
+     - /etc/slurm/acct_gather.conf
+    )
+EOF
 sleep ${SLEEP_TIME}
 echo "I: idle: ${CURRENTWATTS_IDLE}"
 echo "I: running..."