[OpenAFS-devel] performance study

[Kris Van Hees]

I am currently doing just that, as far as the AFS client code is concerned,
under a grant from the Dept of Energy.  Results from that will be shared
once the work is done (and has been delivered to the DOE).  It is specifically
analyzing the cache manager components, and the RX protocol impact, in order
to isolate parts of the AFS client (and/or networking layer) that impact the
performance most.

Concerning the volserver...  Are you using the threaded volserver, and are you
seeing performance problems with all volumes, or specific types of volumes?
Since the way the propagation mechanism between volservers works, volumes with
a large amount of relatively small files will take a lot longer than a volume
of the same size with only a few very large files.

	Kris

On Mon, Feb 14, 2005 at 05:56:10PM -0500, John S. Bucy wrote:
> 
> AFAIK, noone has done a detailed performance evaluation of AFS in some
> time.  I was thinking of doing such a thing for a class project. 
> Here are a few things that I've thought about looking at:
> 
> 1.  RX.  How does it do on the wire?  How does it compare to modern
> sunrpc+gssapi?  How does it compare to TCP for bulk-data throughput.
> 
> 2.  CM.  How much overhead does the cache manager add above and beyond
> the underlying filsystem?  People have mumbled that the cache has
> scalability problems.  What are they?
> 
> 3.  volserver.  Volume moves seem to be slow and at least the last
> time I brought it up at a celladmin meeting, noone seemed to know why.
> jhutz said (IIRC) that the various pieces had been tested in isolation
> and were ok when tested piecewise, so apparently there's some weird
> interaction in the whole system.
> 
> Are there other things that are unknown/interesting?  Thoughts?
> 
> 
> 
> thanks
> john
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