Fork POC

The purpose is to reach a load average as high as possible (visible with uptime command)

Principle

Use fork(2) and RT possibilities

1st fork is the evil child that will keep the specified CPU busy and set with a RT priority high enough to prevent all following forks to have a chance to run on the same CPU

Next forks use the same CPU but have a RT priority smaller than the evil child's one

Test

• compile with make

• run with sudo, specify the id of CPU to use, and the max number of forks to create:

$ sudo ./a.out 2 5000

• monitor with htop to get the values of current load_average, number of tasks/threads, and each CPU occupation

• compile with $ make WITH_THREADS=1 to enable the creation of RT threads within each fork