My question comes from an observation that I made while seeing an every minute cronjob running like that:
12:00:15 (cron started) 12:01:20 (cron started) 12:02:02 (cron started) . . .
As it seems the cron doesn't run every minute (every 60 seconds). That cron actually runs a php script that does a mysql query that selects and updates the database. It completes in less than 2 seconds.
A cronjob scheduled for every minute is supposed to run on the start of the minute (12:00:00) or it would run on any other particular second of that minute?
Has the load of the system anything to do with that? Is there any way to make sure that a cron starts at the very beginning of a minute?