wp-cron on multisite depends on (sub), so each instance is separate. Thus, a call from a.site.com is a completely separate instance from a call from b.site.com
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1) ( , , ). , wp-config WP_CRON_LOCK_TIMEOUT, 3600. , cron . , .
2) wp-cron , cron wp-cron crontab.
define ('DISABLE_WP_CRON', true);
wp-config, crontab
curl http://site.com/wp-cron.php
3600 ( wget )
3) , wp-cron . script, cron, , , 3600 . , cron. , cron . (. add_site_option() update_site_option() get_site_option(), , , )
4) "premium", PHP, . 60 , . http://codecanyon.net/item/improved-cron/176543
wp-cron.php , , , , .
() cron:
http://wordpress.org/extend/plugins/wp-crontrol/
http://wordpress.org/extend/plugins/wp-cron-control/
http://wordpress.org/extend/plugins/cron-view/