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Calculating Disk Read/Write in Linux with C++

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linux-howto

http://stackoverflow.com – My requirement is to profile current process disk read/write operations with total disk read/write operations (or amount of data read/written). I need to take samples evry second and plot a graph between these two. I need to do this on Linux (Ubuntu 12.10) in c++. Are there any APIs/Tools available for this task ? I found one tool namely iotop but I am not sure how to use this for current process vs system wide usage. Thank You (HowTos)