On Tue, Aug 19, 2008 at 20:33, Bernard Li <[EMAIL PROTECTED]> wrote: > I currently have an incomplete fix, but I need to get consensus as to > what average utilization really means for grid of grids: should > "average utilization" for a grid be load average divided by the number > of cpus for the *entire* meta-grid or just over the grid in question?
For a both the grid and meta-grid I think the average utilization should be counted for all hosts. Consider a meta-grid that gets data from from two grids A and B. Grid A has 100 hosts and Grid B has 20. If 15 machines are running full-tilt (e.g. 100% utilization on 15 different hosts), then the Grid utilization figures are quite different. For Grid A, there's a utilization of 15%. For Grid B, it's 75%. If we weight the two grids equally, we get an average utilization of 82.5%, even though there are 90 idle systems. On the other hand, if you take into account the number of hosts, you get a different figure: (15+15)/(100+20) = 25% average utilization. To me, this seems to be a more accurate representation of the overall usage. Now, this does *not* take into account things like relative CPU speeds, or multi-core systems. 100% utilization on my ancient Celeron is quite a bit different than 100% on the latest quad-core Operton. I don't think that we need to delve quite that far into compariing > Alternatively, we can rollback this backport and punt it until 3.1.2. Probably the cleanest solution for now. > On a related note, I think we should distinguish between a "Grid" and > a "Meta-Grid" (i.e. a grid of grids) in the Front End -- do people > care? Yes, it would be good to distinguish between them, even if all it does is say "Meta-Grid" instead of "Grid." -- Jesse Becker GPG Fingerprint -- BD00 7AA4 4483 AFCC 82D0 2720 0083 0931 9A2B 06A2 ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Ganglia-developers mailing list Ganglia-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-developers
