#
# Subroutines which derive information from
#   ghc garbage collection stats -- %gcstat
#

sub max_residency {
    local(%gcstats) = @_;
    local($i, $max) = (-1, 0);

    if ($gcstats{"collector"} eq "APPEL") {
    	die "APPEL stats: average residency not possible\n" ;
    }

    while(++$i < $gcstats{"gc_no"}) {
	$max = $gcstats{"live_$i"} > $max ?
		   $gcstats{"live_$i"} : $max;
    }
    $max;
}

sub avg_residency {
    local(%gcstats) = @_;
    local($i, $j, $total);

    if ($gcstats{"collector"} eq "APPEL") {
    	die "APPEL stats: average residency not possible\n" ;
    }

    if ($gcstats{"gc_no"} == 0) { return(0); };

    $i = 0; $j = 0;
    $total = $gcstats{"live_$i"} * $gcstats{"mut_user_$i"} / 2;

    while(++$i < $gcstats{"gc_no"}) {
	$total += ($gcstats{"live_$i"} + $gcstats{"live_$j"})
		 * $gcstats{"mut_user_$i"} / 2;
	$j = $i;
    };

    $total += $gcstats{"live_$j"} * $gcstats{"mut_user_$i"} / 2;

    int($total / $gcstats{"mut_user_total"});
}

1;