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Re: Sample Resource Specifications for Substrate Components
by Ted Faber
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On Tue, Apr 22, 2008 at 03:23:56PM -0400, John Jacob wrote:
> Ted,
>
> Yes, this is the issue I was getting at. The basic question is how to
> identify slicing granularity, and possibly isolation, in an Rspec. You
> captured the issue well. I agree that there will be many ways to slice
> the diverse substrate technologies as well as different ways to slice
> similar substrate technologies, which is one of the reason we might want
> to advertise the granularity. In a similar manner, two similar resources
> with similar slice granularities may have different isolation
> properties, which is something else we might need to consider in an
> advertisement of a resource. On this latter point, is isolation a
> prerequisite for slicing, or can a resource be sliced with different
> degrees of isolation?People have certainly put forth the idea of allocating resources as
"best effort," which sounds a lot like "with minimal isolation" to me.
It's a little tough to think of isolation in terms other than "as
complete as we can make it" and "no guarantees," though. Are you
thinking of a scale that's more experessive than that?
I agree with you that an expression of granularity could be useful. I
worry that with the many axes on which one can slice, coming up with the
right abstraction for granularity is tricky. I wonder if a combination
of aggregation and simple time/space granularity expressions is
sufficient...
--
Ted Faber
http://www.isi.edu/~faber PGP: http://www.isi.edu/~faber/pubkeys.asc
Unexpected attachment on this mail? See http://www.isi.edu/~faber/FAQ.html#SIG
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> Ted,
>
> Yes, this is the issue I was getting at. The basic question is how to
> identify slicing granularity, and possibly isolation, in an Rspec. You
> captured the issue well. I agree that there will be many ways to slice
> the diverse substrate technologies as well as different ways to slice
> similar substrate technologies, which is one of the reason we might want
> to advertise the granularity. In a similar manner, two similar resources
> with similar slice granularities may have different isolation
> properties, which is something else we might need to consider in an
> advertisement of a resource. On this latter point, is isolation a
> prerequisite for slicing, or can a resource be sliced with different
> degrees of isolation?
"best effort," which sounds a lot like "with minimal isolation" to me.
It's a little tough to think of isolation in terms other than "as
complete as we can make it" and "no guarantees," though. Are you
thinking of a scale that's more experessive than that?
I agree with you that an expression of granularity could be useful. I
worry that with the many axes on which one can slice, coming up with the
right abstraction for granularity is tricky. I wonder if a combination
of aggregation and simple time/space granularity expressions is
sufficient...
--
Ted Faber
http://www.isi.edu/~faber PGP: http://www.isi.edu/~faber/pubkeys.asc
Unexpected attachment on this mail? See http://www.isi.edu/~faber/FAQ.html#SIG
_______________________________________________
substrate-wg mailing list
substrate-wg@...
http://lists.geni.net/mailman/listinfo/substrate-wg
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