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topher
Asked: 2014-06-04 07:06:00 +0800 CST

Is I/O priority propagated to child processes?

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I recently found out about ionice. If I run a script which in turn runs processes will the priorities of the child processes be equal to the parent script? If not, is there a way to set priorities for the child processes together?

UPDATE

Niceness does propagate as answered on unix.se. Does the I/O priority do too?

process-priority

1 Answers

  1. Best Answer

    Yes, both ionice and nice values are inherited by the children of a process. In the future, you can test things like this by running the following command to test and print the ionice value of a process and compare to its parent:

    ionice -p $pid

    These questions on unix.stackexchange and superuser have more information on the subject:

    https://unix.stackexchange.com/questions/37896/nice-and-child-processes

    https://superuser.com/questions/63091/do-children-processes-inherit-ionice-priorities-from-their-parents-how-do-you-c

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