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On Wednesday September 09, 2009, Brian Bouterse wrote:
> Hi All,
>
> I'm wondering what the scalability limits of VCL?  What are the limits
> of the vcld component, and why do we believe they exist?  Does the
> frontend have any scalability limits?

There are 2 parts of the frontend code that could cause sluggishness with 
heavy loading.  The code that determines a user's authorization is not very 
well optimized and slows down as the privilege tree gets larger.  The other 
area is that the scheduler can only allow one user through at a time to keep 
from double booking resources.  If a very large number of users tried to make 
reservations at the same time, they could end up waiting a bit to be allowed 
through that part of the code.  Even with those weak spots, I would think it 
would support in the 10s of thousands of users (though your db server would 
need to be pretty good).

Josh

> I'm trying to figure out what the reasonable number of VMs a single
> vcld installation can concurrently support.  What do you think and why?
>
> Best,
> Brian
>
>
> Brian Bouterse
> NEXT Services
> 919.698.8796
- -- 
- -------------------------------
Josh Thompson
Systems Programmer
Virtual Computing Lab (VCL)
North Carolina State University

josh_thomp...@ncsu.edu
919-515-5323

my GPG/PGP key can be found at pgp.mit.edu
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