diff --git a/hl_tests/postgres/run.sh b/hl_tests/postgres/run.sh
old mode 100644
new mode 100755
index aaab8f5..132ed97
--- a/hl_tests/postgres/run.sh
+++ b/hl_tests/postgres/run.sh
@@ -1,29 +1,26 @@
 #!/bin/bash
+set -e
 
-CLIENTS=${CLIENTS:-"16 32 48 64 80 96"}
-TRANSACTINOS_PER_CLIENT=${TRANSACTINOS_PER_CLIENT:-"100 200 300 400 500 600 700 800 900 1000"}
-RESULTS_FILE=${RESULTS_FILE:-"results.json"}
+CLIENTS=${CLIENTS:-"4 8"}
+TRANSACTINOS_PER_CLIENT=${TRANSACTINOS_PER_CLIENT:-"1 2"}
 
 
-createdb -O postgres pgbench
-pgbench -i -U postgres pgbench
+sudo -u postgres createdb -O postgres pgbench
+sudo -u postgres pgbench -i -U postgres pgbench
 
-echo "{" > $RESULTS_FILE
 
 for num_clients in $CLIENTS; do
     for trans_per_cl in $TRANSACTINOS_PER_CLIENT; do
         tps_all=''
         for i in 1 2 3 4 5 6 7 8 9 10; do
-            tps=$(pgbench -c $num_clients -n -t $trans_per_cl -j 4 -r -U postgres pgbench |
-            grep "(excluding connections establishing)" | awk {'print $3'})
-            tps_all="$tps_all\n$tps"
+            echo -n "$num_clients $trans_per_cl:"
+            sudo -u postgres pgbench -c $num_clients -n -t $trans_per_cl -j 4 -r -U postgres pgbench |
+            grep "(excluding connections establishing)" | awk {'print $3'}
         done
-        # calculate average and deviation
-        echo "$num_clients $trans_per_cl: " >> $RESULTS_FILE
-        echo -e $tps_all | awk  '{ col=1; array[NR]=$col; sum+=$col; print "col="$col,"sum="sum} END {for(x=1;x<=NR;x++){sumsq+=((array[x]-(sum/NR))^2);} print "[" sum/NR "," sqrt(sumsq/(NR-1)) "], " }' >> $RESULTS_FILE
     done
 done
 
-echo "}" >> $RESULTS_FILE
+sudo -u postgres dropdb pgbench
 
+exit 0