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Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
Bob Jenkins Wrote: (03272016, 01:44 PM)

I'm still stuck on the mass distribution / stability of the central core. I'm getting closer to being able to simulate it, I have a high precision floati... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
01062017, 01:59 PM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
Tachyon Wrote: (10112015, 06:58 AM)

I'm not sure what you mean by "swapping bits", but writing a bit requires [tex]\log_e(2)k_BT[/tex] joules per bit, and is an irreversible process.

Replac... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
03272016, 01:44 PM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
Orbital rings! I hadn't encountered that before. I'll have to think about those. My immediate reaction is that anything tethered to the ring at a speed different from the ring will find some varian... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
10072015, 04:41 PM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
If you could pack bits at 1 bit per neutron or proton, a kilogram contains 6.022e26 bits. By Landauer's principle, clearing 6.022e26 bits costs at least 6.022e26 * 1.38e23 * T * ln(2) = 28801 joules... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
07072015, 03:11 PM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
Bear Wrote: (07052015, 12:12 PM)

No matter how you slice it though, there's no advantage. Clearing the bits locally at site A, and conducting the heat away to site B using a superconductor, wil... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
07062015, 05:31 AM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
stevebowers Wrote: (07052015, 08:10 AM)

Welcome to OA, by the way, Bob!
I wonder if you have seen the 'Jenkins' swarm images I've made, variants of which used on several pages, and based on yo... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
07052015, 09:59 AM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
Bear Wrote: (07052015, 01:50 AM)

... it would introduce a speedoflight roundtrip between the computation and the heat disposal, and that would slow the computation down at least twice as much ... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
07052015, 03:53 AM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
Generally, I'm trying to maximize computation while minimizing entropy increase. This particular design is http://burtleburtle.net/bob/future/bigdata.html , the rotating torus is http://burtleburtle.... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
07042015, 05:06 PM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
Sorry, new to the discussion groups, I didn't notice for awhile that the 11th post and onwards are on separate pages.
For virtual life where the internal computation is the entire universe, time to... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
06182015, 01:47 PM 


Thread: A novel threat to high technology
Post: RE: A novel threat to high technology
You can't print new things cheaply without also having some way to break them down, otherwise your house fills up with things or the world fills up with garbage dumps. There's a monetary incentive to... 

Bob Jenkins 
Real Life But OA Relevant

12 
25,630 
06092015, 03:04 PM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
If gravity is the main problem with packing matter into the center, a stationary sphere isn't the best approach. For example a ring rotating about its center of gravity could hold more mass total fee... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
06092015, 01:25 PM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
If the implementation of the reversible operations generates more heat than the bit clearing, yah, it reduces to normal irreversible computing, which has been explored before. So I'm assuming reversi... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
06092015, 12:43 PM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
Yes, you've got it exactly right so far.
Put a really big reversible computer in the place you'd expect a star, and a bunch of bit erasers spread out in a periphery sphere 1AU away in all direction... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
06072015, 02:14 PM 


Thread: clearing bits far away from computation
Post: RE: clearing bits far away from computation
Drashner1 Wrote: (06062015, 11:08 AM)

To be honest, I'm not entirely clear on what you're describing here.
I'm somewhat familiar with the concept of reversible computing, but not with 'bit cl... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
06062015, 04:44 PM 


Thread: clearing bits far away from computation
Post: clearing bits far away from computation
Irreversible computing can be done as reversible computing plus bit clearing. Swapping bits is reversible. You don't have to clear bits at the same place that computation consumes zeros. You could ... 

Bob Jenkins 
Real Life But OA Relevant

33 
71,608 
06052015, 06:26 PM 