Mongodb get Effective Lock
I dont realy try it or sure that is true but i read same info on webs 

user_load+system_load+table as %    (how mush use) 
,CPU                        as %    (how mush use)
,network_processor_load     as %    (how mush use)
memory                      as %    (how mush use)
combine will give you the % that you wont...


at lest im hope so XD...

sorry... if it not ture ^o.0^ but still my brain was work hard for this...

sooo easy on me...

and dont - star pliz