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What is the difference among VIRT, RES, and SHR in top output in Linux memory management?

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What is the difference among VIRT, RES, and SHR in top output in Linux memory management?
posted Oct 30, 2015 by Manikandan J

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What is major difference between the Historic Unix and the new BSD release of Unix System V in terms of Memory Management?

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I wrote and compiled c code. I am using command "time a.out" . Every time output comes different.

$time ./a.out

real 0m0.002s
user 0m0.001s
sys 0m0.001s
-bash-3.2$ time ./a.out

real 0m0.001s
user 0m0.001s
sys 0m0.001s
-bash-3.2$ time ./a.out

real 0m0.001s
user 0m0.000s
sys 0m0.001s

Can someone please explain why these different different output come ?

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