Linux Process Management 5

Question 1

What does 'strace -p PID' do?

Accepted Answer

Attaches to a running process and traces its system calls

Answer

strace -p attaches to an already-running process and prints every system call it makes, useful for debugging hangs or unexpected behavior.

Question 2

Which scheduling policy gives a process guaranteed CPU time slices in a real-time manner?

Accepted Answer

SCHED_FIFO

Answer

SCHED_FIFO is a real-time scheduling policy where a process runs until it yields or is preempted by a higher-priority real-time process.

Question 3

What information does 'cat /proc/PID/status' provide?

Accepted Answer

Human-readable process metadata including state, memory, and UIDs

Answer

/proc/PID/status provides a human-readable summary of process state, memory usage, thread count, and real/effective UIDs.

Question 4

What happens when a process calls exec() after fork()?

Accepted Answer

The current process image is replaced with a new program

Answer

exec() replaces the calling process's memory image with a new program, keeping the same PID but running entirely new code.

Question 5

Which command shows real-time per-process I/O statistics?

Accepted Answer

iotop

Answer

iotop displays a top-like interface showing disk read/write rates per process in real time.

Linux Practice Test