[Planetlab-users] Why so high load averages?
vivek at CS.Princeton.EDU
Wed May 12 17:16:13 EDT 2004
Luis Garces-Erice wrote:
> sorry if I'm interferring, but i think this is very important for
> anybody performing experiments on Planet-Lab, specially if s/he has
> their publication in mind. I quote Steve:
> > It's a distributed network testbed, used by
> > a large number of users, replete with all the accompanying issues. If
> > you're building a distributed application that assumes a 24/7 available
> > system with the entire CPU available to one user then PlanetLab is
> > probably not for you.
> Well, perhaps Joe's is not a realistic assumption, but if I perform an
> experiment, I want to control as much as possible the environmnet, to be
> sure of what my results *really* mean.
If you really don't want any variation in environment, I believe that
both Emulab and Modelnet can give you a more predictable test
environment. Not trying to drive anyone away from PlanetLab, but it's
more of a "right tool for the job" approach. If you want all of the
ugliness that really exists, PlanetLab is pretty good for that.
> How can I be sure of a given
> performance measurement in Planet-Lab, if some machines might be hogged
> ? How can I consider the results of a experiment if I'm not sure of
> what's going on, and what might be affecting it ?
You can monitor the local environment in many ways and see what's
happening while your experiment is running. Not perfect, but it can
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