free displays the total amount of free and used physical and swap memory in the system. In your case "free -g" it showing you how much memory you are using right now in gigabits. On Tue, Dec 18, 2012 at 11:52 AM, AshikAli.m <ashikali.m at gmail.com> wrote: > Hi, > > I have two 64 bit cent Os machine. I googled that in linux always show > entire memory as used. But below showing only 1 GB detected. > > > *Machine 1 :* > i) It has 31 GB of ram. > > [root at machine1]# free -g > total used free shared buffers > cached > Mem: 31 1 30 0 0 0 > -/+ buffers/cache: 0 30 > Swap: 49 0 49 > ------------------------------------------ > > *Machine 2 :* > i)It has 11 GB of ram. > > [root at machine2]# free -g > total used free shared buffers > cached > Mem: 11 11 0 0 0 9 > -/+ buffers/cache: 1 10 > Swap: 49 0 49 > > > Could you please anyone can explain why ? > > > Thanks, > Ashik > -* > * > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >