I have recently started to host a minecraft server on google cloud shell using https://github.com/lordofwizard/mcserver , and its all well untill we check the specs, my friends when cheking on his account has 16 GB of ram and 2 cores , but i only have 8 GB of ram and 1 core , there is no other alt account of mine which got the 16 GB ram and 2 core machine, any idea how does google cloud shell gives its users ram and is it possible to change the amount it gives , Note this is for the non-paid version of google cloud shell.
There is no way to modify the memory nor CPU on the Cloud Shell. If you need something more, please create a VM using Compute Engine where you can modify it to your needs.
You can run free -h to see the size of memory.
According to the Github page you linked to it says this:
Each Cloud Shell session will have different specs of your server based on your physical location so you won't always get the best performance of your server but good news being that it's always the range between 8GB to 16GB so you won't have to worry about lag when playing in the server with high processing in your server.