Perl6 meets JVM

Perl6 + JVM
tokuhirom
YAPC::Asia 2016

Amon2,Harriet, Localizer,
Minilla, Test::Requires,
etc.

This is Rakudo Star, a useful,
usable Perl 6 distribution for
"early adopters".
曰く､

Products
• nqp: Perl6 subset, to write Perl6 interpreter
• rakudo: One of Perl6 implementation

VM Support
• Parrot: VM for…
• MoarVM: VM for Perl6
• JVM: VM for Java ← Today’s topic

Because, I’m using
Java for $DAYJOB

You can use java
libraries, instead of poor
Perl6 libraries.

perl6-j is probably useful
for Java developers

wget http://rakudo.org/
downloads/star/rakudo-
star-2015.07.tar.gz

tar xzvf rakudo-
star-2015.07.tar.gz

perl Conﬁgure.pl
—backends=jvm
—gen-nqp
--preﬁx=$HOME/perl6

brew install rakudo-star
—with-jvm

Evaluation point as a
Web developer

• Start-up speed
• File access
• JSON processing
• HTTP client
• HTTP Server(Performance)
• Access to mysql
• use java libraries

time ./install/bin/perl6-j
-e 'say "Hello, YAPC”’
Hello, YAPC
./install/bin/perl6-j -e 'say "Hello, YAPC”'
17.32s user 0.51s system 254% cpu
6.995 total

> javac Hello.java
> time java Hello
Hello
java Hello 0.12s user 0.03s
system 116% cpu 0.130 total

time perl -E 'say "Hello, YAPC"'
Hello, YAPC
perl -E 'say "Hello, YAPC"' 0.04s
user 0.04s system 83% cpu 0.094
total

time /usr/local/bin/perl6-m -e 'say "hello"'
hello
/usr/local/bin/perl6-m -e 'say "hello"' 0.31s
user 0.04s system 97% cpu 0.360 total

> use JSON::Tiny;
> from-json(‘[1,2,true]').perl
[1, 2, Bool::True]

to-json(
{“a"=>5.16,"b"=>false,"c"=>[1..5]}
)

> use LWP::Simple
> LWP::Simple.get("http://
64p.org")
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML
1.0 Transitional//EN" "http://www.w3.o$
g/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

But there’s no legacy
encoding support.

> LWP::Simple.get("http://
google.co.jp")
Unknown encoding 'shift_jis'

FFI - Foreign Function
Interface

require DynaLoader;
DynaLoader::dl_install_xsub(
"myfork",
DynaLoader::dl_ﬁnd_symbol(
DynaLoader::dl_load_ﬁle("libc.so"),
'fork'
),
);
myfork();

my $dbh =
DBIish.connect('SQLite', :
database<theﬁle.sqlite3>);

cp /usr/local/Cellar/sqlite/
3.8.9/lib/libsqlite3.dylib ./

Supported DB:
PostgreSQL
MySQL
SQLite3

use DBIish;
my $dbh =
DBIish.connect('mysql', :host<127.0.0.
1>, :port(3306), :database<mysql>, :us
er<root>, :password(''));
my $sth = $dbh.prepare('SHOW
TABLES');
$sth.execute();
my $arrayref = $sth.fetchall_arrayref();
$arrayref.perl.say;

sub mysql_affected_rows( OpaquePointer
$mysql_client )
returns int32
is native('libmysqlclient')
{ ... }

use HTTP::Easy::PSGI;
my $http = HTTP::Easy::PSGI.new(:port(8080));
my $app = sub (%env) {
my $name = %env<QUERY_STRING> || "World";
return [ 200, [ 'Content-Type' => 'text/plain' ], [ "Hello
$name" ] ];
}
$http.handle($app);

with perl6-m
• ab -n 50 -c 1 http://127.0.0.1:8080/
• Requests per second: 5.95 [#/sec] (mean)

with perl6-j
• ab -n 50 -c 1 http://127.0.0.1:8080/

10 threads + perl6-j
• ab -c 10 -n 1000 http://127.0.0.1:8080/

Single thread + perl6-j
• single thread
• ab -c 10 -n 1000 http://127.0.0.1:8080/

ab -n 1000 -c 10
http://127.0.0.1:8080/

Time per request:
550.895 [ms] (mean)

(It doesn’t support
concurrency)

use
java::util::zip::CRC32:fro
m<
java>;
my $crc = CRC32.new();

for 'Hello, Java'.encode('utf-8') {
$crc.update($_)
}

my $frame =
JFrame.new("Helloworl
d");
$frame.setDefaultClose
Operation(1);

my $label = JLabel.new("Hello,
world");
$frame.getContentPane.add($labe
l);

$frame.pack();
$frame.setVisible(True)

use
My::Own::Class:from<
Java>:jar<hoge.jar>

There is some issues.
But practical than I
thought

Perl6 meets JVM

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