Show used memory & small comment additions

src/main.rs

@@ -5,11 +5,13 @@ fn main() {
     get_sys_info();
 }
 
+// Function to apply fixed width string printing
 fn printify<A: AsRef<str>, B: Display>(a: A, b: B) {
     println!("{:30}{}", a.as_ref(), b);
 }
 
 fn get_sys_info() {
+    // Store conversion from bytes to GiB
     let bytes_per_gib: u64 = 2u64.pow(30);
 
     // Please note that we use "new_all" to ensure that all list of
@@ -23,23 +25,29 @@ fn get_sys_info() {
     // Store all system information:
     let hostname = System::host_name().unwrap();
 
+    // Store os related information:
     let os_name = System::name().unwrap();
     let os_version = System::long_os_version().unwrap();
 
+    // Store uptime related information:
     let uptime_hours = System::uptime() / 3600;
     let uptime_minutes = (System::uptime() % 3600) / 60;
     let uptime = format!("{} hour(s) and {} minute(s)", uptime_hours, uptime_minutes);
 
+    // Store kernel version:
     let kernel_version = System::kernel_version().unwrap();
 
+    // Store cpu related information:
     let cpu_model = sys.cpus()[0].brand();
     let cpu_cores = sys.physical_core_count().unwrap();
     let cpu_threads = sys.cpus().len();
     let cpu_topology = format!("{} cores {} threads", cpu_cores, cpu_threads);
     let cpu_architecture = System::cpu_arch().unwrap();
 
+    // Store memory related information:
+    let used_memory = sys.used_memory() as f64 / bytes_per_gib as f64;
     let total_memory = sys.total_memory() as f64 / bytes_per_gib as f64;
-    let memory = format!("{:.2} GB", total_memory);
+    let memory = format!("{:.2} GB / {:.2} GB", used_memory, total_memory);
 
     // Print system information:
     printify("Hostname:", hostname);
@@ -54,5 +62,5 @@ fn get_sys_info() {
     printify("CPU Architecture:", cpu_architecture);
 
     // Print memory information:
-    printify("Total Memory:", memory);
+    printify("Memory:", memory);
 }