Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

Re^2: A lesson in statistics (no, specs)

by 0xbeef (Hermit)
on Mar 20, 2007 at 05:26 UTC ( #605640=note: print w/replies, xml ) Need Help??

in reply to Re: A lesson in statistics (no, specs)
in thread A lesson in statistics

Sorry for misleading you, but my initial example is bogus - I merely tried to illustrate the problem I had in requiring the zero-values to be significant in the ratio.

The real-life alert is called the Thrashing Severity Ratio, and is for a po:fr ratio = 1/6 (17%). This is described by Tom Farwell in a writeup of paging spaces, and may be somewhat specific to IBM's AIX.

My problem with that writeup is two-fold:
1. Periods of inactivity (0,0 values) are not given enough weight (this may lead to false positives)
2. The overall volume (po = 4k pages swapped to paging) is not considered, and low volume spikes may provide additional false positives (but NOT if sustained).

I should perhaps have mentioned the actual problem from the start, but I fear the downvote of Monks who feel that this discussion is not close enough to a pure perl problem!


  • Comment on Re^2: A lesson in statistics (no, specs)

Log In?

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://605640]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (5)
As of 2022-05-16 07:46 GMT
Find Nodes?
    Voting Booth?
    Do you prefer to work remotely?

    Results (62 votes). Check out past polls.