vmstat : vmstat is a tool in Unix/Linux which is used to Report virtual memory statistics. It shows how much virtual memory there is, how much is free and paging activity. Most important, you can observe page-ins and page-outs as they happen. vmstat reports information about processes, memory, paging, block IO, traps, and cpu activity. > vmstat procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu----- r b swpd free buff cache si so bi bo in cs us sy id wa st 0 0 21688 12797396 850716 15372668 0 0 3 35 0 0 1 0 99 0 0 0 0 21688 12789292 850716 15372668 0 0 0 1355 883 744 1 0 99 0 0 1 0 21688 12784648 850716 15372676 0 0 0 15 1934 1292 6 0 93 0 0 2 0 21688 12781356 850716 15372736 0 0 0 16 2222 2094 8 1 92 0 0 0 0 21688 12809992 850716 15376880 0
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