$op_c->{ops} = { '' => [ $lei->can('dclose'), $lei ] };
my @first_batch = splice(@$upq, 0, $j); # initial parallelism
$lei->{-upq} = $upq;
$op_c->{ops} = { '' => [ $lei->can('dclose'), $lei ] };
my @first_batch = splice(@$upq, 0, $j); # initial parallelism
$lei->{-upq} = $upq;