Command to install:

sudo apt-get install stress

Testing, sameple command:

stress -c 4 -m 5 -d 1
(Explaination:, -c means cpu cores number count that will under stress test. -m means how many memory threads are going to under stress test, -d HDD numbers.)

System configurations:

Intel core i3 2330E/8GB ram/80GB HDD

Tested with above and “stress -c 4 -m 20 -d 1”. Then tried adjusted -m to -m 40 and system crashed and hanged up.

Pfft, nice try.