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parallel: Median time implemented using remedian.

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Ole Tange 2013-04-30 01:36:07 +02:00
parent eac8d05e3a
commit ee30290b9a
1 changed files with 28 additions and 7 deletions
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35
src/parallel
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@ -5565,12 +5565,14 @@ sub new {
$pct = $1/100;
$delta_time = 1_000_000;
$avg_damper = (1-0.001)/0.9;
}
}
return bless {
'queue' => [],
'delta_time' => $delta_time,
'pct' => $pct,
'avg_damper' => $avg_damper,
'remedian_idx' => 0,
'remedian_arr' => [],
'remedian' => undef,
}, ref($class) || $class;
}
@ -5584,17 +5586,36 @@ sub set_delta_time {
$self->{'delta_time'} = shift;
}
sub remedian {
my $self = shift;
return $self->{'remedian'};
}
sub set_remedian {
# Set median of the last 999^3 (=997002999) values using Remedian
#
# Rousseeuw, Peter J., and Gilbert W. Bassett Jr. "The remedian: A
# robust averaging method for large data sets." Journal of the
# American Statistical Association 85.409 (1990): 97-104.
my $self = shift;
my $val = shift;
my $i = $self->{'remedian_idx'}++;
my $rref = $self->{'remedian_arr'};
$rref->[0][$i%999] = $val;
$rref->[1][$i/999%999] = (sort @{$rref->[0]})[$#{$rref->[0]}/2];
$rref->[2][$i/999/999%999] = (sort @{$rref->[1]})[$#{$rref->[1]}/2];
$self->{'remedian'} = (sort @{$rref->[2]})[$#{$rref->[2]}/2];
# die((sort @{$rref->[2]})[$#{$rref->[2]}/2]);
}
sub update_delta_time {
# Update delta_time based on runtime of finished job if timeout is
# a percentage
my $self = shift;
my $runtime = shift;
if($self->{'pct'}) {
# Converge to the average fast in the start, and slower later
$self->{'avg_damper'} = $self->{'avg_damper'} * 0.9 + 0.001;
$self->{'delta_time'} =
$self->{'pct'} * $runtime * $self->{'avg_damper'} +
(1 - $self->{'avg_damper'}) * $self->{'delta_time'};
$self->set_remedian($runtime);
$self->{'delta_time'} = $self->{'pct'} * $self->remedian();
::debug("Timeout: $self->{'delta_time'}s ");
}
}