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My system is centos 7.4 with atop-2.3.0-8.el7.x86_64.
I already have 3 days log in var/log/atop, such as atop_20190312 atop_20190313 atop_20190314.

I want to find out the peak period of CPU consumption in those 3 days.
Based on this post,I tried: 

atopsar -r /var/log/atop/ -A -R 3 -c |head

but failed.

How to read several days atop log into one?

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I am sorry to say that as I know, atopsar is not able to combine several days.

Selection the date:

You can use -r to directly read one atop-log file. If you need to check yesterday or the day before, you can use -r y. If you add y you can select even older days: -r yy would be the day before yesterday.

Selection the right report

You can either select all reports with -A or select for example CPU only with -c. Selecting both doesn't make sense.

Conclusion

Since you want to see the cpu utilization for 3 days, you can see them:

Today: 
# atopsar  -R 3 -c |head

Yesterday:
# atopsar -r y -R 3 -c |head

2 Days ago:
# atopsar -r y -R 3 -c |head

Hope that helps.

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  • If only one day range, I am sad that's not statistics
    – kittygirl
    Commented Mar 15, 2019 at 0:25
  • what's the meaning of -R 3 of atopsar -R 3 -c |head ?
    – kittygirl
    Commented Mar 15, 2019 at 0:43
  • Hi @kittygirl . You started with -R 3 in your question. It means: Summarize 3 samples into one sample. Please consult the man pages or linux.die.net/man/1/atopsar for more details.
    – Daniel Andersen
    Commented Mar 15, 2019 at 12:20
  • seemed something wrong with your answer 2 days ago # atopsar -r y
    – kittygirl
    Commented Mar 16, 2019 at 2:57
  • Have a look at https://superuser.com/questions/599464/graphing-atop-logs/708127?noredirect=1#comment2135038_708127
    – kittygirl
    Commented Mar 16, 2019 at 11:36

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