Process and Job Scheduling Flashcards
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Read the first 7 Process and Job Scheduling flashcards as text
Which command sends a SIGSTOP signal to suspend a running process with PID 1234?
Answer: kill -STOP 1234
SIGSTOP (signal 19) pauses a process; it cannot be caught or ignored, unlike SIGTSTP sent by Ctrl+Z.
What does the `renice` command do in Linux?
Answer: Changes the priority of an already-running process
`renice` alters the scheduling priority of one or more running processes without restarting them.
A systemd timer unit is configured with `OnCalendar=daily`. What does this mean?
Answer: The associated service runs once every 24 hours at midnight
`OnCalendar=daily` is equivalent to `*-*-* 00:00:00`, triggering the service at midnight each day.
Which file would you edit to schedule a cron job that runs as the `www-data` user?
Answer: /etc/cron.d/myjob
Files in `/etc/cron.d/` support a username field, allowing jobs to run as a specific user like `www-data`.
What is the output of `ps aux` showing in the STAT column value `Z`?
Answer: A zombie process that has finished but not been reaped
A 'Z' (zombie) process has exited but its parent has not yet called `wait()` to collect its exit status.
Which `systemctl` subcommand lists all active timers along with their next trigger time?
Answer: systemctl list-timers
`systemctl list-timers` displays all active timers, their last trigger, and their next scheduled activation.
A process has a nice value of -10. What can you infer about its scheduling?
Answer: It receives more CPU time than processes with higher nice values
Lower (more negative) nice values grant higher scheduling priority, so -10 gets more CPU than nice 0 or positive values.
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