lib/PublicInbox/LeiQuery.pm | 6 ++----

diff --git a/lib/PublicInbox/LeiQuery.pm b/lib/PublicInbox/LeiQuery.pm
index 4099b26c85ce87e4b0005f98008987d2e518d72b..efe328ccc3945a0af99c721af9549ed15eb67e11 100644
--- a/lib/PublicInbox/LeiQuery.pm
+++ b/lib/PublicInbox/LeiQuery.pm
@@ -5,7 +5,6 @@ # handles lei <q|ls-query|rm-query|mv-query> commands
 package PublicInbox::LeiQuery;
 use strict;
 use v5.10.1;
-use POSIX ();
 
 sub prep_ext { # externals_each callback
 	my ($lxs, $exclude, $loc) = @_;
@@ -23,7 +22,7 @@ 		return $self->fail("`$xj' search jobs must be >= 1");
 	}
 	my $lxs = $self->{lxs};
 	$xj ||= $lxs->concurrency($opt); # allow: "--jobs ,$WRITER_ONLY"
-	my $nproc = $lxs->detect_nproc // 1; # don't memoize, schedtool(1) exists
+	my $nproc = $lxs->detect_nproc || 1; # don't memoize, schedtool(1) exists
 	$xj = $nproc if $xj > $nproc;
 	$lxs->{-wq_nr_workers} = $xj;
 	if (defined($mj) && $mj !~ /\A[1-9][0-9]*\z/) {
@@ -37,8 +36,7 @@ 				(($opt->{'import-before'} //= \1) ? 1 : 0)) {
 		$self->_lei_store(1)->write_prepare($self);
 	}
 	$l2m and $l2m->{-wq_nr_workers} = $mj // do {
-		$mj = POSIX::lround($nproc * 3 / 4); # keep some CPU for git
-		$mj <= 0 ? 1 : $mj;
+		$mj = int($nproc * 0.75 + 0.5); # keep some CPU for git
 	};
 
 	# descending docid order is cheapest, MUA controls sorting order