Thanks for that dngor! The first one is definitely what I meant I'm trying to do. Sorry for being too vague.

I was able to get something working using LeoNerd's IO::Async framework. If anyone cares to take a look, let me know if there are any obvious problems:

#####################3 server.pl
use strict;
use warnings;
use diagnostics;
use Time::HiRes qw(time);
use IO::Socket::INET;
use IO::Async::Stream;
use IO::Async::Loop;

my $loop = IO::Async::Loop->new();

my $server_socket = IO::Socket::INET->new(
    Listen    => 5,
    ReuseAddr => 1,
    LocalPort => 8888,
    Proto     => 'tcp',
    Blocking  => 1,     # This line is very important
) or die $!;
$server_socket->autoflush( 1 ) or die $!;

$loop->listen(
    handle =>  $server_socket,

    on_accept => sub {
        my ( $newclient ) = @_;

        $loop->add(
            IO::Async::Stream->new(
                handle => $newclient,

                on_read => sub {
                    my ( $self, $buffref, $closed ) = @_;
#                    $self->write( $$buffref );
                    warn 'READ: ', $$buffref;
                    my $send_start = time;
                    $newclient->send( 'ECHO: ' . $$buffref );
                    warn 'TIME TO SEND TO CLIENT: ', time - $send_star
+t;
                    $$buffref = '';
                    return 0;
                },
            ),
        );
    },

    on_resolve_error => sub { print STDERR "Cannot resolve - $_[0]\n";
+ },
    on_listen_error  => sub { print STDERR "Cannot listen\n"; },
);

$loop->loop_forever();
[download]

######################## client.pl
use strict;
use warnings;
use diagnostics;
use Time::HiRes();
use IO::Socket::INET;


my $time = time;
while() {

    my $client_socket = IO::Socket::INET->new(
        PeerAddr => '127.0.0.1',
        PeerPort => '8888',
        Proto    => 'tcp',
    ) or die $!;
    $client_socket->autoflush( 1 ) or die $!;

    my $send_start = Time::HiRes::time;
    sleep int rand 6;
    warn sprintf( "PID: %s, TIME TO SEND TO SERVER: %s, ELAPSED: %s\n"
+, $$, Time::HiRes::time - $send_start, time - $time, );
    $client_socket->send( sprintf( "PID: %s, TIME TO SEND TO SERVER: %
+s, ELAPSED: %s\n", $$, Time::HiRes::time - $send_start, time - $time,
+ ) );

    my $recv_start = time;
    sleep int rand 11;
    $client_socket->recv( my $buffer, 1024 );
    warn sprintf 'TIME TO READ FROM SERVER %s: ELAPSED: %s GOT: %s', T
+ime::HiRes::time - $recv_start, time - $time, $buffer;
}
[download]

If any other framework authors would care to chime in *cough*mlehmann*cough* please feel free!

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