[tahoe-dev] Benchmarks - 1.7.1 vs. 1.8.0c3

[Peter Westlake]

On Wed, 08 Sep 2010 16:58 +0100, "Brian Warner" <warner at lothar.com>
wrote:
...
> What I'd love to have is a test framework in which we could simulate
> multiple servers (of varying CPU speeds) connected by virtual pipes with
> controllable latency and bandwidth limits. Then we could run an
> experiment like measuring download speed as the bandwidth limits are
> raised, where I'd expect to see it taper off as we approach the
> CPU-speed limit. (I remember writing this desire up on a whiteboard at
> allmydata about four years ago and labelling it "and also, I want a
> pony"). A lot of the performance measurements we've been making are at
> unlabled points along some axes of CPU-speed, network-speed, and share
> distribution.. being able to label those points and compare apples to
> apples would probably help us understand what's going on a lot better.

I wonder if twistedsim might be helpful?

   http://code.google.com/p/twistedsim/wiki/Introduction

Bandwidth modelling is listed in the futures section, but I bet it
would be a good place to start.

Peter.