Add Perl/PostgreSQL version

dcb_perl_psql

@@ -0,0 +1,24 @@
+#!/usr/bin/perl
+use v5.30;
+use warnings;
+
+use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC);
+
+my $t0 = clock_gettime(CLOCK_MONOTONIC);
+
+use DBI;
+
+for my $rep (1 .. 2) {
+    my $t1 = clock_gettime(CLOCK_MONOTONIC);
+
+    my $dbh = DBI->connect("dbi:Pg:", "");
+
+    my $t2 = clock_gettime(CLOCK_MONOTONIC);
+    my $result = $dbh->selectall_arrayref("select current_timestamp");
+    my $t3 = clock_gettime(CLOCK_MONOTONIC);
+    $dbh->disconnect();
+    my $t4 = clock_gettime(CLOCK_MONOTONIC);
+
+    say $t2 - $t1, " connect $rep";
+    say $t4 - $t1, " session $rep";
+}