Some programs, i.e. GAMESS, needs a larger number of system semaphores than provided by default. This role creates a config file in /etc/sysctl.d/ that sets the value on startup, so that it is persistent after reboot

It also runs a Shell command so change has immediate effect: This is the default value for the role echo 500 256000 64 10240 > /proc/sys/kernel/sem

We use a variable SEM_COUNT so users can override the default setting.

use

• { role: set_semaphore_count } #to use default value hardcoded inside main.yml, (as above) or
• { role: set_semaphore_count, SEM_COUNT: "200 252000 24 20240" } #to use some other value (the ones here are nonsense for example only)