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  CPU stats are only instaneous values… every 5 minutes!

  Posted by daggett on December 4, 2006 at 20:44

  the cpu_* agents are collecting values from vmstat every 5 minutes, but these are instantaneous values, they don’t represent what was happening during the 5 minutes.

  So maybe it can be replaced by:
  cat /proc/stat | head -1 | awk ‘{print $N}’

  where N represents the wanted field:
  #2 user: normal processes executing in user mode
  #3 nice: niced processes executing in user mode
  #4 system: processes executing in kernel mode
  #5 idle: twiddling thumbs
  #6 iowait: waiting for I/O to complete
  #7 irq: servicing interrupts
  #8 softirq: servicing softirqs

  this returns how many hundredth of a second the processor was occupied by user/total/idle… and they are counters incremented on and on.
  So, there are 60*100*5 of 1/100s in 5 minutes, so the percentage is (currentValue-previousValue)/30000.

  The only problem is that we CAN’T do any computation in the pandora console when defining a module… (I added this in the wish list).
  But never mind, the data won’t show percentage, but they’ll be an image of it.
  Then in Pandora console, take the value as generic_data_inc (wich does currentValue-previousValue).

  daggett replied 18 years, 2 months ago 1 Member · 0 Replies
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