top command not clear

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http://askubuntu.com – I am using top command on my centos server. Mem: 8055100k total, 3832228k used, 4222872k free, 57968k buffers Swap: 8191992k total, 0k used, 8191992k free, 3574740k cached In case of memory, I see 3832228k used, but when I check per process consumption, its showing 0%. can some one tell which process is consuming this memory. I have also attached a screenshot for this. (HowTos)