Shell script for testing Postgres with and without an active connection.

psql_test.sh

#! /bin/zsh
zmodload zsh/datetime

start=$EPOCHREALTIME
for i in {1..100};
do
    PGPASSWORD=password psql -U localadmin testing -c "select count(*) from pg_stat_activity;" > /dev/null;
done
end=$EPOCHREALTIME
echo "Test 1 Elapsed Time: $((end-start))";

start=$EPOCHREALTIME
PGPASSWORD=password psql -U localadmin testing \
-c "DO
    \$do\$
    BEGIN
    FOR i IN 1..100 LOOP
        perform count(*) from pg_stat_activity;
    END LOOP;
    END
    \$do\$;" > /dev/null;
end=$EPOCHREALTIME
echo "Test 2 Elapsed Time: $((end-start))";