[CentOS] centos 5.5 check memoray usage too high???

Wed Feb 2 21:59:48 UTC 2011
Sean Hart <boardnutz at blacklight.net>

On 2/2/11 1:58 PM, mcclnx mcc wrote:
> We have DELL R900 server with 128GB RAM (CENTOS 5.5)in it.  This server only have one application running and few people use it.
> Every week I ata least get one or two messages from monitor tool mail to me say:
> Message=Memory Utilization is 92.02%, crossed warning (80) or critical (90) threshold. 
> Since server have 128 GB RAM and only 1 application.  I really don't belive that.  Does there has some way can check memory utilitation ?

What is the output of the command "free"?