man ntop - it's pretty clear on -r:
-r | --refresh-time
Specifies the delay (in seconds) between automatic screen updates
for
those generated HTML pages which support them. This parameter
allows
you to leave your browser window open and have it always
displaying
nearly real-time data from ntop.
The default is 3 seconds. Please note that if the delay is very
short
(1 second for instance), ntop might not be able to process all of
the
network traffic.
-----Burton
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of
> Andre Costa
> Sent: Thursday, August 19, 2004 4:47 AM
> To: [EMAIL PROTECTED]
> Subject: Re: [Ntop] Sampling interval
>
>
> On Wed, 18 Aug 2004 15:47:10 -0500
> "Burton M. Strauss III" <[EMAIL PROTECTED]> wrote:
>
> > Nope.
> >
> > Read docs/FAQ there is a discussion of what ntop is. But basically,
> > it's processing every packet on the wire, so of course it's going to
> > run continuously.
>
> Right. I thought so, but I got misled by the refresh parameter.
>
> > You SHOULD be running ntop on it's own server, anyway...
>
> Yeah, now that you mention it, makes a _lot_ of sense... we were running
> it on a couple of machines with -s (no promiscuous) enabled, but it
> makes much more sense to keep it running in promiscuous mode on a
> dedicated (or at least light-loaded) server.
>
> Thks for the tip.
>
> Best,
>
> Andre
>
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf
> > > Of Andre Costa
> > > Sent: Wednesday, August 18, 2004 1:53 PM
> > > To: ntop ML
> > > Subject: [Ntop] Sampling interval
> > >
> > >
> > > Hi,
> > >
> > > we have just started using ntop on a couple of servers here to
> > > monitor network performance. We are using "-r 60", but, according to
> > > the manual, it only affects screen updates, and ntop is always
> > > ranked among the top 5 processes for CPU usage -- which suggests it
> > > is _not_ running only at every 60s. (... please apologize if I am
> > > overlooking something obvious)
> > >
> > > Is there any parameter to control sampling interval? Some of these
> > > servers are very busy, so it would be good to know we're not
> > > competing for valuable resources.
> > >
> > > TIA
> > >
> > > Andre
> > >
> > > PS: the complete command line we're using is "ntop -b -n -s -z -r 60
> > > -w 3000-d-u ntop"
> > >
> > > --
> > > Andre Oliveira da Costa
> > > ([EMAIL PROTECTED])
> > > _______________________________________________
> > > Ntop mailing list
> > > [EMAIL PROTECTED]
> > > http://listgateway.unipi.it/mailman/listinfo/ntop
> >
> > _______________________________________________
> > Ntop mailing list
> > [EMAIL PROTECTED]
> > http://listgateway.unipi.it/mailman/listinfo/ntop
>
>
> --
> Andre Oliveira da Costa
> ([EMAIL PROTECTED])
> _______________________________________________
> Ntop mailing list
> [EMAIL PROTECTED]
> http://listgateway.unipi.it/mailman/listinfo/ntop
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