hoo@terbium:~$ mwscript eval.php --wiki wikidatawiki
> $lockManager = LockManagerGroup::singleton( wfWikiID() )->get( 'redisLockManager' );

> $clientLockName = str_replace( ' ', '_', "Wikibase.wikidatawiki.dispatchChanges.zhwiki" );

>  var_dump( $lockManager->lock( [ $clientLockName ] ) );
object(StatusValue)#355 (6) {
  ["ok":protected]=>
  bool(true)
  ["errors":protected]=>
  array(0) {
  }
  ["value"]=>
  NULL
  ["success"]=>
  array(0) {
  }
  ["successCount"]=>
  int(0)
  ["failCount"]=>
  int(0)
}

>  var_dump( $lockManager->unlock( [ $clientLockName ] ) );
object(StatusValue)#355 (6) {
  ["ok":protected]=>
  bool(true)
  ["errors":protected]=>
  array(0) {
  }
  ["value"]=>
  NULL
  ["success"]=>
  array(0) {
  }
  ["successCount"]=>
  int(0)
  ["failCount"]=>
  int(0)
}

mysql:wikiadmin@db1070 [wikidatawiki]> SELECT COUNT(*) FROM (SELECT * FROM recentchanges WHERE rc_source = 'mw.edit' ORDER BY rc_timestamp DESC LIMIT 100000) AS innerQ INNER JOIN wb_changes_subscription ON rc_title = cs_entity_id AND rc_namespace = 0 AND cs_subscriber_id = 'zhwiki';
+----------+
| COUNT(*) |
+----------+
|    46145 |
+----------+
1 row in set (21.56 sec)

mysql:wikiadmin@db1070 [wikidatawiki]> SELECT COUNT(*) FROM (SELECT * FROM recentchanges WHERE rc_source = 'mw.edit' ORDER BY rc_timestamp DESC LIMIT 100000) AS innerQ INNER JOIN wb_changes_subscription ON rc_title = cs_entity_id AND rc_namespace = 0 AND cs_subscrib = 'enwiki';
+----------+
| COUNT(*) |
+----------+
|     9038 |
+----------+
1 row in set (1.75 sec)