#!/usr/bin/perl


use strict ;
use warnings ;
use English qw( -no_match_vars ) ;
use Sys::MemInfo ;
use Readonly ;


Readonly my $KIBI => 1024 ;

my $total_ram_memory = total_ram_memory(  ) ;
print "Total RAM memory $total_ram_memory\n" ;
current_memory_used(  ) ;

sub current_memory_used {
        my @ps = qx{ ps -o vsz -p $PROCESS_ID } ;
        print( @ps ) ;
        shift @ps; # First line is column name "VSZ"
        chomp @ps;
        # convert to octets
        my $val = $KIBI * $ps[ 0 ] ;
        print "$val\n" ;
        return $val ;
}


sub total_ram_memory {
	
	return(
		sprintf( "%.1f GiB", Sys::MemInfo::get("totalmem") / ( 1024 ** 3 ) )
	) ;
}