[tahoe-dev] using the volunteer grid (dogfood tasting report, continued)

Zooko O'Whielacronx zooko at zooko.com
Wed Apr 22 17:34:20 UTC 2009

On Apr 8, 2009, at 17:16 PM, Shawn Willden wrote:

> This is a big part of the reason why I think the loss modeling work  
> is important.  In order to get good performance, you want n to be  
> large.  On a stable grid of small to moderate size, you probably  
> want to set m equal to the number of available servers, then adjust  
> n to trade reliability off against performance and expansion.   
> Higher values of n provide better performance (up *and* down) and  
> less expansion but worse reliability.
> This means that it's tempting to set n close to m.  But if you do  
> that, just how bad *is* your reliability?

I agree with all of this.  I have questioned some aspects of your  
modelling work, but I didn't intend to say that it was worthless!   
Only that it is tricky for you to produce a good model, and then it  
is *still* tricky after you've done that for someone else to  
understand how safe it is to use that model to manage real world  
decisions.  Which I'm sure you already appreciated...



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