[rrd-users] Sar data

Mark Seger Mark.Seger at hp.com
Mon Jul 30 19:02:32 CEST 2007

Wes wrote:
> On 7/30/07 10:37 AM, "Mark Seger" <Mark.Seger at hp.com> wrote:
>> I've been thinking about adding rrd style output to collectl but am
>> waiting for someone to raise their hand and say they'd like to work with
>> me.  As for perl being too heavyweight, collectl uses less than 0.1% of
>> the cpu reporting about 100 different variables.  If you want less
>> frequent samples as most rrd users do, you can probably get it down to 0.01%
> I figured programs collecting real-time sar data in RRD would be all over
> the place.  I was very surprised to find such a thing so scarce.
> I am looking at colleting 5-10 second samples.  I may have to resign myself
> to using perl for the sar data.  I have a number of other statistics, some
> of which have to be gathered by scanning very large log files in real time.
> By using C, I had hoped to save as many cycles as possible, and be able to
> use a common set of functions to transmit the data to the central collection
> system.  I guess I can always roll my own.  We have times when every cycle
> we can save is crucial (can't just up and replace the systems with
> faster...)
5-10 second samples is what collectl is all about and it can collect a 
lot more data than sar so perhaps at least some of what you're looking 
for it may already generate.  it's not unusual to have collectl running 
on systems sustaining >90% cpu loads
> Wes

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