20180211, 10:07  #1 
Feb 2018
3^{2} Posts 
Can I run Prime95 on two different computers same time to test one same exponent?
Will that save time?
Does each computer automatically avoid redundant calculations? 
20180211, 10:11  #2  
Undefined
"The unspeakable one"
Jun 2006
My evil lair
2·3,169 Posts 
Quote:
And it won't count as a double check either. That has to be two different computers from different people. 

20180211, 10:32  #3 
"Composite as Heck"
Oct 2017
875_{10} Posts 
You would only potentially want to do that if you were doing an LL test that would many many years, as a way to detect and correct errors as they happen (otherwise that's years of computation lost). But that's not recommended now even for tests that would take years. The solution now would be to do a PRP test first (which takes roughly as long as LL and has stronger error detection, but technically doesn't prove primality), followed by LL tests if it's shown to be probably prime.

20180211, 10:51  #4 
Banned
"Luigi"
Aug 2002
Team Italia
4838_{10} Posts 

20180211, 11:30  #5 
Aug 2002
North San Diego County
19·37 Posts 
Makes sense to me. Easy to create "matching" tests when you have access to the full residue. It won't deter a determined individual, as it is easy to create another account.
Last fiddled with by sdbardwick on 20180211 at 11:32 
20180211, 13:15  #6  
"Jacob"
Sep 2006
Brussels, Belgium
1,777 Posts 
Quote:
Jacob 

20180211, 14:59  #7 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
2·23·223 Posts 
Practically, you can't. Each step requires the result of the previous one. And to share parts of the process between 2 different machines doesn't work well. The time to communicate data between the machines would slow things down. It is much faster overall to have each machine work on a different number. Prime95 often is limited by how fast the CPU can communicate to the machine's RAM. Communication between machines is normally vastly slower than that.
There are exceptions, but the average user does not have access to the machines that are configured properly. And you would want to be running mlucas, not Prime95. (IIRC) 
20180211, 15:09  #8  
"Composite as Heck"
Oct 2017
5^{3}·7 Posts 
Quote:


20180211, 17:38  #9 
"Jacob"
Sep 2006
Brussels, Belgium
1,777 Posts 

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