count=120
With AutoCommit OFF=0.339
With AutoComit ON time=1.266

##</code><code>##

use strict;
use warnings;
use DBI;
use Time::HiRes;

#with AutoCommit = off
sub test_insert1{
my ($dbh,$cnt)=@_;
my($sth,$v,$bgn,$end);
    $v="a" x 1000;
    $sth=$dbh->prepare("insert into test1 (item1) values(?);") or die DBI->errstr;

    $bgn=Time::HiRes::time();
    for (1 .. $cnt){
        $sth->execute($v);
    }
    $sth->finish;
    $dbh->commit;
    $end=Time::HiRes::time();
    return($bgn,$end);
}
#with AutoCommit = on
sub test_insert2{
my ($dbh,$cnt)=@_;
my($sth,$v,$bgn,$end);
    $v="a" x 1000;
    $sth=$dbh->prepare("insert into test1 (item1) values(?);") or die DBI->errstr;

    $bgn=Time::HiRes::time();
    for (1 .. $cnt){
        $sth->execute($v);
    }
    $sth->finish;
    $end=Time::HiRes::time();
    return($bgn,$end);
}sub print_count{
    my($dbh)=@_;
    my $sth;
    my $sql="select count(*) as cnt from test1";
    $sth=$dbh->prepare($sql);
    $sth->execute;
    while(my $r = $sth->fetchrow_hashref){
        print "$r->{cnt}\n";
    }
    $sth->finish;
}

    my($user,$password,$dsn,$dbh,$sth);
    my($bgn,$end);
    my $cnt=120;
    print "count=$cnt\n";
    $user="tetsu";
    $password="";
    $dsn="dbi:Pg:dbname=test1;host=localhost";

    #with AutoCommit OFF
    $dbh=DBI->connect($dsn, $user,$password,{AutoCommit=>0})or die DBI->errstr;;

    ($bgn,$end)=test_insert1($dbh,1000);
    printf("With AutoCommit OFF=%0.3f\n",($end - $bgn));
    #print_count($dbh);

    $dbh->disconnect;

    #with AutoCommit ON
    $dbh=DBI->connect($dsn, $user,$password,{AutoCommit=>1})or die DBI->errstr;;

    ($bgn,$end)=test_insert2($dbh,1000);
    printf("With AutoComit ON time=%0.3f\n",($end - $bgn));
    #print_count($dbh);

    $dbh->disconnect;


##</code><code>##

With AutoCommit OFF=0.224
With AutoComit ON time=0.259