WBJECA 2025 — Computer PYQ

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Question

WBJECA 2025 — Computer PYQ

WBJECA | Computer | 2025

In Unix, a user wants to change the priority of a running process, which is the suitable command?

Choose the correct answer:

Explanation

In Unix-like operating systems, the priority of a process is determined by its nice value. The renice command is specifically designed to alter the scheduling priority of an already running process.

The nice value $N$ typically ranges from -20 (highest priority) to 19 (lowest priority). If $P_{c u r r e n t}$ is the current priority and $P_{n e w}$ is the desired priority, the command is used as follows:

$r e ni ce P_{n e w} - p P I D$

Where $P I D$ is the unique Process ID. The relationship between the system's scheduling priority and the nice value can be represented by the function:

$P r i or i t y_{a c t u a l} = f (N)$

Where lower values of $N$ result in more CPU time allocated to the process.

nice: Used to start a new process with a specific priority.
ps: Used to display information about currently running processes.
kill: Used to send a signal (usually to terminate) to a process.

Because the question specifies a "running process," renice is the only appropriate tool among the choices.