why the executing shell within cron job will take longer time than normal?

Question

I have a shell script which will run project consist of multiple JUnit tests.

Then I call this shell within cron job every a period of time. In this case, I observe the following:

Time to complete executing this shell is longer than directly calling this shell.

I don't know why!?

They must have the same run time, mustn't they?

Probably cron run your process with a lower priority and it receives less cpu and memory resources. — Willian Paixao, Jun 02 '16 at 20:51

score 0 · Answer 1 · answered Jun 02 '16 at 21:00

Your cron job is receiving less resources, you can run it with a higher priority with:

/usr/bin/nice --adjustment=-10 /path/to/cron-script

Note the command above will reduce the resources of running services, so be careful using in production services.

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