How to do incremental cron? I have to manage a rather large site which has problem with cron (white space of death on cron.php and 'segmentation fault' in drush). I could not fix the ong standing problem. Someone has suggested to do the cron job in several steps whcih can also hopefully pinpoint the problematic tables. I am wondering how to do the incremental cron and appreciate your help.
Have a look at Elysia cron.

That module allows you to configure each cron hook implementation separately and it allows provides you with information about how long each mean/max execution time of those hooks.