Re:Analyzing a High Rate of Paging
by CraigJPerry on Tuesday August 31, 2021 @10:50AM
(#28368820)
A few years ago i glommed onto one of Brendan Gregg’s structured models called the USE method, i’ve had a lot of mileage out of it.
Utilisation - have a quick squizz at what resources are being used on the host, so in this case i’m guessing you’d see an elevated %sys time which would lead you to look at probably IO next so maybe disk would be first on your hit list…
Saturation - where are we bottlenecking.
Exceptions - anything going wrong on the host (or indeed in the process).
This model isn’t general though, e.g. it wouldn’t help you identify a deadlock for example.
One for the back pocket. It’s certainly earned a space in mine.
Utilisation - have a quick squizz at what resources are being used on the host, so in this case i’m guessing you’d see an elevated %sys time which would lead you to look at probably IO next so maybe disk would be first on your hit list…
Saturation - where are we bottlenecking.
Exceptions - anything going wrong on the host (or indeed in the process).
This model isn’t general though, e.g. it wouldn’t help you identify a deadlock for example.
One for the back pocket. It’s certainly earned a space in mine.