Added "experiments"

experiments/bench.pl

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+use warnings;
+use 5.026;
+use Time::HiRes qw/gettimeofday tv_interval/;
+
+my $t0 = [gettimeofday];
+my @primes = join ',', grep {prime($_)} 1..1000000;
+my $elapsed = tv_interval($t0);
+printf "%.3f\n", $elapsed;
+
+# http://www.rosettacode.org/wiki/Primality_by_trial_division#Perl
+sub prime {
+	my $n = shift;
+	$n % $_ or return for 2 .. sqrt $n;
+	$n > 1
+}
+
+# A quick test: This program, when run
+# from WebPerl (Firefox):  ~7.4s 
+# natively (same machine): ~2.3s
+# => roughly 3.2 times slower

experiments/sockserv.pl

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+#!/usr/bin/env perl
+use warnings;
+use strict;
+use Data::Dump;
+use IO::Socket;
+
+# $ git clone https://github.com/novnc/websockify
+# $ cd websockify
+# $ ./run 2345 localhost:2346
+
+my $serv = IO::Socket::INET->new(
+	LocalAddr => 'localhost',
+	LocalPort => 2346,
+	Proto     => 'tcp',
+	Listen    => 5,
+	Reuse     => 1 ) or die $@;
+
+# really dumb server
+print "Listening...\n";
+while (my $client = $serv->accept()) {
+	print "Got a client...\n";
+	print $client "Hello, Perl!\n";
+}
+

experiments/socktest.pl

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+use warnings;
+use 5.028;
+use Socket;
+use Fcntl qw/F_GETFL F_SETFL O_NONBLOCK/;
+use IO::Select;
+use Data::Dumper;
+$Data::Dumper::Useqq=1;
+
+my $port    = 2345;
+my $iaddr   = inet_aton("localhost") || die "host not found";
+my $paddr   = sockaddr_in($port, $iaddr);
+
+# Note: Emscripten apparently doesn't like NONBLOCK being passed to socket(),
+# and I couldn't get setsockopt to work yet - but the following works.
+# https://github.com/kripken/emscripten/blob/d08bf13/tests/sockets/test_sockets_echo_client.c#L166
+# everything is async - need "our $sock" here so it doesn't go out of scope at end of file
+socket(our $sock, PF_INET, SOCK_STREAM, getprotobyname("tcp")) or die "socket: $!";
+my $flags = fcntl($sock, F_GETFL, 0) or die "get flags: $!";
+fcntl($sock, F_SETFL, $flags | O_NONBLOCK) or die "set flags: $!";
+connect $sock, $paddr or !$!{EINPROGRESS} && die "connect: $!";
+
+# so far so good... but probably should just use something like IO::Async instead
+
+