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memory usage doesn't add up [duplicate]

Possible Duplicate: How do I get the actual used memory including RAM disks? If I add up all the memory usage I get from top -b -n 1 or htop or ps aux, I get a number that is a few GB under ...
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Is there an application that can show memory usage in a similar manner to top?

I would like to leave an application running in my terminal that shows me the memory usage, similar to how top shows CPU and other info, and iotop shows the top I/O users. Does such an application ...
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How to log memory and cpu usage of an application?

Similar to question How to log CPU load?, I would like to log memory of a process. The process I want to log, is killed on a remote server, and I want to find out the CPU load and the memory usage ...