Rust Server amount of ram used


I’m currently running a Rust Server on Debian 8 and I’m wondering if there’s any possibility to increase the amount of ram Rust can use.
It currently looks like Rust is using max. 5GB Ram but I want to increase it.
My Server has 32GB of Ram and it has the Intel XEON D-1540 (If anybody wants to know)

Why would you want Rust to consume more RAM as it actually needs? That said, on my windows server, I never passed 1,5GB RAM usage (4000 map size, 30-40players).