atop

atop -r y -b 18:00 -e 18:00

-r: read

-b: begin time

-e: end time

atop -r -b 18:00 // no need to specify time for today’s data

atop -r 20150624 -b 18:00 -e 08:00 // specify date for the file to look up

atop => show cpu, memory at a time in the past

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