Max instances / overlapping executions

Thuan Nguyen

FastCron founder

You can prevent overlapping or allow up to 5 overlapping executions by adjusting the Max instances.

FastCron runs cronjobs at the scheduled times by default, regardless of ongoing executions. If a cronjob takes more time to run than its interval, it leads to overlapping executions.

You can now allow up to 5 overlapping executions by adjusting the Max instances: instances

The table below shows running executions when you allow up to 3 overlaps:

TimeRunning executionsEvents
21 2
31 2 3
41 2 34 is skipped
51 3 52 complete
63 5 61 is removed
73 5 67 is skipped
86 83 and 5 complete
996 and 8 complete
  • When there are 3 running executions, new executions are skipped.
  • When one execution is complete, another execution starts running.
  • When you remove a running execution (visit the Running tab, delete a running execution), another execution starts running.

Please note that removing a running execution just deletes it from our database. The execution will continue to run until it’s complete or timed out.

API function cron_add and cron_edit update: single is deprecated, please use instances instead.

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