-ssh $C2DEBMACHINE find . -type f -iname '*.changes' -print0 \| \
- perl -n0e '$b = $_; $b =~ s/.changes/.upload/; -e $b || print $_.qq(\0);' | \
- xargs -0 debsign -r $C2DEBMACHINE -k$KEYID;
+ssh $C2DEBMACHINE "find \$(echo c2d/build_results*) -type f -iname '*.changes' -print0 | perl -n0e 'next unless /.changes/; \$b = \$_; \$b =~ s/.changes/.upload/; -e \$b || print \$_;'" | \
+ xargs -0r -P 4 -n 40 --verbose debsign -r $C2DEBMACHINE --re-sign -k$KEYID;