On 30 Jun 2001, at 20:16, Guido Lorenzini wrote:
> 1st observation: the "beerman's" computer named
> SKA4 seems to work simultaneously on 4 33mio exponents, since each
> exponent is getting iterations: how it come? If any Cpu is best
> working on just one copy of prime95, even a dual cpu PC should have 2
> computer ID...You may see the same situation with DEJEFLATERIC of
> netconx, but, once again, these are just examples.
This looks odd, but in fact I can set up as many systems as I like
with the same computer id, making many systems appear to be one. I
can also confuse the issue by changing the computer id on a single
system, making one system appear to be many.
> 2nd: Sometimes it
> happens that an exp. is assigned to an unspecified computer ID (for
> example, the account "kpgcfd", has some). Is it possible?
Yes. When I joined the project more than three years ago, blank
computer IDs were very common. The server software has been changed
to automatically assign computer IDs to new systems being set up when
the user has not set the computer ID himself, but there are still a
number of systems running with blank IDs which have been active since
before this change was made.
> 3rd: Net_Force seems to have some wonderful machines, called
> (properly!)10MIL-X: they are able to test (or factoring) dozen of
> 33mio exponents in 2 months time or more! Any information about the
> processor of these machines? Or is it relevant the fact bits? (60 or
I don't know what's going on here. The fact bits just means that when
the assignment was given out, that's the factoring depth that was
done. For exponents of this size, you're supposed to complete
factoring to 68 bits before starting the LL test.
> 4th: netconx
> reserved 2,325 33mio exps on its computer ID DEJECHRISTIA, most of
> them with 60 fact bits or less. It started getting 'em on June 20th at
> 4:59 AM, one each two minutes, till June 23th at 12:07 PM. Now it may
> be too long to explain but this mass of 33mio exps. seems to be
> bounced like a ball from an account to another (e.g. from kpgcfd, ID
> mac_233, on May to netconcx by now); then these exponents, assigned in
> June to netconx to computer ID DEJECHRISTIA, were assigned to the same
> account netconx, but to a machine called BART, in April 7th. I really
> do not understand what's going on... Is there anybody who may give me
> do not understand what's going on...
Me neither. I reckon that big block of exponents expired & got picked
up again. The only thing that seems to make any sense is that someone
is running in a Beowulf cluster that happens to have no net
connection (maybe because it's running in a highly secure
environment), so they're using one system to collect work & then farm
it out locally. Anyway it's doing no harm, so long as they leave a
few assignments for other people to pick up! It will be interesting
to see what happens in a few months, when (if my guess is true) there
may be a big block of results coming in more or less at the same
time.
Regards
Brian Beesley
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