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root |
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package transferqueue; |
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use Scalar::Util; |
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my @reserve = ( |
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[ 1_200_000, 1], |
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[ 8_000_000, 1], |
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[ 75_000_000, 1], |
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); |
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sub new { |
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my $class = shift; |
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my $self = bless { |
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slots => $_[0], |
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lastspb => 0, |
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avgspb => 0, |
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}, $class; |
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$self->{reschedule} = Event->timer( |
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after => 10, |
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interval => 3, |
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cb => sub { $self->wake_next }, |
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); |
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$self; |
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} |
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sub start_transfer { |
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my $self = shift; |
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my $size = $_[0]; |
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my $transfer = bless { |
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queue => $self, |
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time => $::NOW, |
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size => $size, |
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coro => $Coro::current, |
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started => 0, |
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}, transfer::; |
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push @{$self->{wait}}, $transfer; |
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$self->wake_next; |
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$transfer; |
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} |
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sub sort { |
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my @queue = grep $_, @{$_[0]{wait}}; |
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$_->{spb} = ($::NOW-$_->{time}) / ($_->{size} || 1) for @queue; |
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$_[0]{wait} = [sort { $b->{spb} <=> $a->{spb} } @queue]; |
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Scalar::Util::weaken $_ for @{$_[0]{wait}}; |
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} |
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sub wake_next { |
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my $self = shift; |
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$self->sort; |
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while (@{$self->{wait}}) { |
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my $size = $self->{wait}[0]{size}; |
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my $min = 0; |
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for (@reserve) { |
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last if $size <= $_->[0]; |
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$min += $_->[1]; |
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} |
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last unless $self->{slots} > $min; |
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my $transfer = shift @{$self->{wait}}; |
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$self->{lastspb} = $transfer->{spb}; |
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$self->{avgspb} = $self->{avgspb} * 0.99 + $transfer->{spb} * 0.01; |
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$self->{started}++; |
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$transfer->wake; |
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last; |
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} |
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} |
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sub waiters { |
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$_[0]->sort; |
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@{$_[0]{wait}}; |
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} |
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sub DESTROY { |
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my $self = shift; |
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$self->{reschedule}->cancel; |
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} |
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package transfer; |
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use Coro::Timer (); |
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sub wake { |
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my $self = shift; |
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$self->{alloc} = 1; |
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$self->{queue}{slots}--; |
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$self->{wake} and $self->{wake}->ready; |
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} |
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sub try { |
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my $self = shift; |
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$self->{alloc} || do { |
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my $timeout = Coro::Timer::timeout $_[0]; |
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local $self->{wake} = $self->{coro}; |
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Coro::schedule; |
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$self->{alloc}; |
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} |
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} |
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sub DESTROY { |
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my $self = shift; |
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if ($self->{alloc}) { |
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$self->{queue}{slots}++; |
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$self->{queue}->wake_next; |
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} |
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} |
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1; |
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