
vmstat (virtual memory statistics) is a computer system monitoring tool that collects and displays summary information about operating system memory, processes, interrupts, paging and block I/O. Users of vmstat can specify a sampling interval which permits observing system activity in near-real time. The vmstat tool is available on most UNIX and U...
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http://en.wikipedia.org/wiki/Vmstat

Report virtual memory statistics, see Section 4.3.5.4.
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http://www.tldp.org/LDP/intro-linux/html/gloss.html
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