[RC5] When RC5 will be finished...

tomdv at datatx.com tomdv at datatx.com
Sun Nov 4 12:41:50 EST 2001

Dear Bruce and others,
I have read all your comments with interest. But still, my old P120 goes 
off line. The client  am working with, allows for 'random' keys in the RC5 
contest. So, this random key goes against the 90 days rule, mentioned 
earlier. If a computer takes too few blocks, or work units, it runs empty 
so it starts with 'random', just happening to take the blocks of my good 
old P120 away. But now that it has only a 3 day recycle period, that 
definitely rules out the P120.
See, my point is that apart from improving the client, we can also think 
about the word 'distributed', which is where also a lot off waste can be 
generated. As for knowing where what went, we all have a participation 
number, right? That might be enough, but that it will be a hard task to 
do, I can see that from where I'm sitting.
Did you do any calculations on what the effect might be of the 3 day 
recycle, with random blocks sitting in the way as well, with older 
computers that run slower, and so on? Would it be useful to do it?
By for now,

Please respond to rc5 at lists.distributed.net
Sent by:        owner-rc5 at lists.distributed.net
To:     <rc5 at lists.distributed.net>
Subject:        RE: [RC5] When RC5 will be finished...

 >I believe this question also goes for RC5. We had this issue before
when we were speaking about load of work on a PC. See, if I use a P120
and only update every two weeks, I have a pretty high chance the blocks
it crunched have been processed already by someone else. Actually, I
deinstalled dnet from that computer for exactly that reason.

This is not true.  We avoid recycling work units for several months to
avoid this exact problem.  If you download umpty-jillion work units, you
could run into this on any speed PC.  If you stick closer to our
recommendations, you're not vulnerable.

 >For all at dnet, we always speak about 'wasting' cycles when we
mention a screensaver. Now, apart from that, if we have slow computers
that update every two weeks only and their work was done by a faster
computer, that also is a waste of cycles. Rather than starting any new
contest, is it possible to review what can be done to avoid  this from
happening or at least have a better control? Maybe you need to have a
list of who has what units and verify what happen with the work units if
long time no see.

We are already struggling with a huge data load just managing the stubs.
Trying to track where we sent the work (which proxy did it go to?  Did
it go to a perproxy or a client?  Was the work unit processed by that
client, or did a different computer do it via sneakernet or shared
buffers?  How could we uniquely identify everyone who checks in for
work?) would be a huge and impractical undertaking.

Bruce Wilson <bwilson at distributed.net>
PGP KeyID: 5430B995, http://www.toomuchblue.com/

rm -rf /bin/laden  && chmod 0777 /dev/freedom

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