------------------------------------------------------ Martin Knoblauch email: k n o b i AT knobisoft DOT de www: http://www.knobisoft.de
----- Original Message ---- > From: David Barnes <david.g.bar...@gmail.com> > To: ganglia-general@lists.sourceforge.net > Sent: Wed, July 7, 2010 1:59:13 AM > Subject: [Ganglia-general] bytes_in (and bytes_out): instantaneous or > averaged? > > Hi all, I am planning to use historical archives of ganglia data for > our cluster to document its utilisation history and guide our > next upgrade. I would like to understand the bytes_in and bytes_out > metrics a bit better. Are they instantaneous, or average, > measurements? Ie. say my gmond polling time is 5 seconds. If the > following happens, with nothing else going on of significance: @ t = 0 > second, gmond polls metrics (poll0) @ t = 1 second, 1Mbyte transferred in > (effectively instantly) @ t = 3s, 5Mbyte transferred out (effectively > instantly) @ t = 5s, gmond polls metrics (poll1) What is going to be > stored in bytes_in and bytes_out for poll1? Will it be the *average* > (integrated) throughput: bytes_in: 1Mbyte / 5s = 200kByte/s => > bytes_in = 200000 bytes_out: 5Mbyte / 5s = 1000kBytes/s => bytes_out = > 1000000 Or will it be the instantaneous throughput measured at the time > of poll1, ie. both bytes_in and bytes_out = 0 because there is > no instantaneous activity? Another way of asking the same question: is > it valid to deduce long-term (aggregate) data transfer volumes from the rates > expressed by bytes_in and bytes_out? Thanks very much in advance - > David > Barnes. ------------------------------------------------------------------------------ This > SF.net email is sponsored by Sprint What will you do first with EVO, the > first 4G phone? Visit sprint.com/first -- > href="http://p.sf.net/sfu/sprint-com-first"; target=_blank > >http://p.sf.net/sfu/sprint-com-first _______________________________________________ Ganglia-general > mailing list > href="mailto:Ganglia-general@lists.sourceforge.net";>Ganglia-general@lists.sourceforge.net > href="https://lists.sourceforge.net/lists/listinfo/ganglia-general"; > target=_blank > >https://lists.sourceforge.net/lists/listinfo/ganglia-general ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Ganglia-general mailing list Ganglia-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-general
