Hi,

thanks! I will try unicast, as I have some weird behavior of my Ganglia
- upon restart everything works, but the whole cluster grows silent over
time. Don't know why, but I couldn't get around this by updating ganglia
to latest...

Arne

On Mon, 2010-11-29 at 23:49 -0800, Bernard Li wrote:
> Hi Arne:
> 
> On Thu, Nov 18, 2010 at 3:02 AM, Arne Brutschy <[email protected]> 
> wrote:
> 
> > I am using Ganglia for a cluster of ~70 nodes - single monitor, single,
> > flat network. What's the recommended type of operation for this, unicast
> > or multicast? What are the (dis)advantages of each mode?
> 
> I would start simple and use the default settings (multicast), it is
> fairly easy to set up.
> 
> Network administrators have mentioned that multicast is "chatty" and
> causes jitter.  If the workload on your cluster is sensitive to that,
> you might consider switching to unicast.  I am sure Google and the
> mail archives is a great source of knowledge regarding these.
> 
> I just added this to the FAQs -- hope this helps.  Comments/thoughts
> on the subject welcome!
> 
> https://sourceforge.net/apps/trac/ganglia/wiki/FAQ
> 
> Thanks,
> 
> Bernard

-- 
Arne Brutschy
Ph.D. Student                    Email    arne.brutschy(AT)ulb.ac.be
IRIDIA CP 194/6                  Web      iridia.ulb.ac.be/~abrutschy
Universite' Libre de Bruxelles   Tel      +32 2 650 2273
Avenue Franklin Roosevelt 50     Fax      +32 2 650 2715
1050 Bruxelles, Belgium          (Fax at IRIDIA secretary)


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