Process Scheduling

Question 1

What command is used to influence process scheduling

Answer 1

nice

Question 2

How many possible nice values are there

Answer 2

40 values from -20 to 19

Question 3

Highest priority nice value

Answer 3

-20

Question 4

Lowest priority nice value

Answer 4

19

Question 5

What nice values can user set

Answer 5

0 to 19, the lowest

Question 6

Determine how many cpus are on the hosts

Answer 6

lscpu -p

Question 7

Write a command to consume cpu cycles

Answer 7

dd if=/dev/zero of=/dev/null

Question 8

Default nice value

Answer 8

0

Question 9

How do you change the nice value of a process?

Answer 9

You renice it. Example: renice 8 7464

Question 10

set the niceness of the process with PID 1234 to 10.

Answer 10

renice 10 1234
renice -n -15 3434

Question 11

Start a process with a given priority

Answer 11

nice -n -4 dd if=/dev/zero of=/dev/null

Question 12

Wrong way to modify systemd values

Answer 12

do it in /usr/lib/systemd/system

DO NOT DO THIS

Question 13

Right way to modify systemd values

Answer 13

Copy config file from /usr/lib/systemd/system to /etc/systemd/system and modify the copy

Question 14

Using grep find how many cpus you have

Answer 14

grep -c '^processor' /proc/cpuinfo

Question 15

Determine the nice value of a process

Answer 15

ps -o pid,nice,cmd -p [PID]