[Planetlab-users] Sirius Calendar Service Not Functional

[Larry Peterson]

Robert,

Apologies for not letting you know that we had figured out a quick fix.

On a more important point, thanks for your efforts to systematically
monitor Sirius and report your findings. We continue to depend on this
sort of community vigilance. I haven't spoken to Vivek about this, so
apologies if this doesn't make sense, but a "Sirius column" would be
be a useful addition to CoMon.

Larry

On Jan 23, 2007, at 4:44 PM, Robert P Ricci wrote:

> The Sirius Calendar Service on PlanetLab is currently not functional.
> Though Sirius is still accepting reservations, there is a bug that
> prevents it from actually delivering the promised share of the CPU;
> having a Sirius reservation currently makes no appreciable  
> difference on
> the amount of CPU a sliver gets on PlanetLab nodes.
>
> The bug has been acknowledged by PlanetLab support, and I have been  
> told
> that it will not be fixed right away - a new version of the PlanetLab
> software will be rolled out soon, so fixing bugs in the current  
> version
> is not a priority. I do not know for sure how long Sirius has been
> broken, but I'm pretty sure it has been since at least December 19,
> 2006, when I first noticed the problem and reported it.
>
> I discovered this while investigating why one of my applications  
> did not
> behave as expected with a Sirius reservation. I have since run large
> experiments confirming the problem. If you're interested, I've put  
> up a
> page with more detail, including a graph demonstrating this issue,  
> here:
>
>     http://www.flux.utah.edu/users/ricci/sirius.html
>
> The graph is somewhat interesting in its own right, as it shows the
> distribution of available CPU across PlanetLab.
>
> -- 
> /-----------------------------------------------------------
> | Robert P Ricci <ricci at cs.utah.edu> | <ricci at flux.utah.edu>
> | Research Associate, University of Utah Flux Group
> \-----------------------------------------------------------
>
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