perl and epoll

[sonet]

When i use one program to send data. The speed of upload file is slow.
But when i use two(>=2) programs to testing the transmission speed at
the same time. It is very fast. The transmission speed is almost equal
to (* how many programs is running)

I can not find any solution to slove the problem.I try to modify the the
value of epoll_wait()'s parameter.

my $events_count = epoll_wait( $epoll,15,3600, $events );
my $events_count = epoll_wait( $epoll,2,0, $events );
my $events_count = epoll_wait( $epoll,2,-1, $events );
my $events_count = epoll_wait( $epoll,2,100, $events );

But the problem still exist.
And i find that the $events_count always is 1 when i upload file via
another programs.
=========================================================
#!/usr/bin/perl
use strict;
use IO::Socket;
use Sys::Syscall ':epoll';
use Errno 'EWOULDBLOCK';
my ( $haveEpoll, $epoll );
if ( Sys::Syscall::epoll_defined() )
{
$epoll = eval { epoll_create(1); };
$haveEpoll = defined $epoll && $epoll >= 0;
}
if ( !$haveEpoll )
{
require IO:oll;
}

my $listen = IO::Socket::INET->new(Proto => 'tcp',
LocalPort => 21,
Listen => SOMAXCONN ,
Reuse => 1) or die $!;

PollIn_Event_Add( $epoll, fileno($listen) );

my %accepthash;
my $events;
while (1)
{
$events = [];
my $events_count = epoll_wait( $epoll,15,3600, $events );

for ( my $i = 0 ; $i < $events_count ; $i++ )
{
my $ev = $events->[$i];
$ev ||= [];

if (! defined $accepthash{$ev->[0] } && $ev->[0] eq
fileno($listen) ){
my $connect=$listen->accept();
PollIn_Event_Add( $epoll, fileno($connect) );
$accepthash{fileno($connect)}=$connect;
open(handle,">/usr/local/Portal/cache/" . fileno($connect) );
close(handle);
}else{

if ( $ev->[1] == EPOLLIN )
{
my $buffer='';
my $rc = sysread($accepthash{$ev->[0]}, $buffer, 16384,0 );
if ( defined $rc )
{
if ( $rc > 0 )
{
#print $rc . "\n";
open(handle,">>/usr/local/Portal/cache/" . $ev->[0]);
print handle $buffer;
close(handle);
substr( $buffer, 0, $rc ) = '';
} else
{

eval { shutdown( $accepthash{$ev->[0]}, 2 ); };
delete $accepthash{$ev->[0]};
}


} elsif ( $! == EWOULDBLOCK )
{

} else
{

eval { shutdown( $accepthash{$ev->[0]}, 2 ); };
delete $accepthash{$ev->[0]};
PollIn_Event_Del( $epoll, $ev->[0] );
}

}elsif($ev->[1] == EPOLLERR){

eval { shutdown( $accepthash{$ev->[0]}, 2 ); };
delete $accepthash{$ev->[0]};
PollIn_Event_Del( $epoll, $ev->[0] );
}
}
}
}

sub PollIn_Event_Add
{
my ( $epoll, $fd ) = @_;
my $ctl_rtn;
$ctl_rtn = epoll_ctl( $epoll, EPOLL_CTL_ADD, $fd, EPOLLIN | EPOLLERR );
print 'PollIn_Event_Add:' . $ctl_rtn . "\n";
}

sub PollIn_Event_Del
{
my ( $epoll, $fd ) = @_;
my $ctl_rtn;
$ctl_rtn = epoll_ctl( $epoll, EPOLL_CTL_DEL, $fd,0 );
print 'PollIn_Event_Del:' . $ctl_rtn . "\n";
}