get system total memory in rust

To get the total memory of the system in Rust, we can use the sys-info crate. Here's an example code snippet that shows how to use it:

main.rs
use sys_info::mem_info;

fn main() {
    let mem = mem_info().unwrap();
    let total_memory = mem.total;

    println!("Total memory: {} KB", total_memory);
}
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This code will print the total memory of the system in kilobytes. The mem_info() function returns a Result<SysInfo, String> where SysInfo is a struct that contains various system information including the total and free memory sizes. We use the total field of the returned SysInfo object to get the total memory size in kilobytes.