20130425, 06:52  #1 
"Nathan"
Jul 2008
Maryland, USA
5×223 Posts 
Piddling Around With Big Compute Power
So, I've been granted some trial time on a cluster. I'm still learning just what is available, but I know that I have the login system at my disposal to start (it has 8 x Xeon E52670 2.6GHz CPUs and 16GB RAM). I then apparently have the ability to call on other nodes in the cluster (to what extent, I am still trying to work out), each of which has 2 of the aforementioned Xeon CPUs, 2 NVIDIA Tesla K20 or K10 (choice seems to be mine, depending on what is available) GPUs, and 32GB of RAM.
Anyway, I have been playing around with CUDALucas (wow!), as well as doing some Extreme GIMPS stuff, like P1 with ungodly amounts of RAM. I thought I'd post interesting results here. Like this one, for instance...I never knew E could be 12... UID: ANONYMOUS, M100002677 completed P1, B1=1105000, B2=33702500, E=12, We8: xxxxxxxx, AID: xxx This took under 24 hours using 4 threads and 30GB of RAM. I have the option of asking for 256GB of RAM...wonder what might happen then? Let me know if there's something interesting you'd like to try out... 
20130425, 06:59  #2 
Sep 2005
1111111_{2} Posts 
Superfac13 on big mersenneplustwos (3M+), please
J 
20130425, 12:29  #3  
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
2·4,201 Posts 
Quote:
Someone will also likely suggest looking at some numbers down on the lower end of the spectrum. Last fiddled with by Uncwilly on 20130425 at 12:31 

20130425, 14:53  #4  
"Nathan"
Jul 2008
Maryland, USA
2133_{8} Posts 
Quote:
Quote:
Last fiddled with by NBtarheel_33 on 20130425 at 14:54 

20130425, 15:20  #5 
Jun 2009
3·223 Posts 
Does it behave like one big machine, i.e. can software be run parallellized over several nodes? If so, try to prove 2^73845+14717 from the Five Or Bust project using PRIMO on 32 cores. It will still take many weeks though.
Last fiddled with by PuzzlePeter on 20130425 at 15:21 Reason: typo 
20130425, 17:57  #6  
ἀβουλία
"Mr. Meeseeks"
Jan 2012
California, USA
17·127 Posts 
Quote:
CPU TF efficiency compared to GPU is terrible. 

20130425, 21:54  #7 
Just call me Henry
"David"
Sep 2007
Cambridge (GMT)
5694_{10} Posts 

20130426, 01:01  #8 
Jul 2003
So Cal
2^{3}·11·23 Posts 
CUDAPm1 on the K20 would be helpful.

20130426, 02:23  #9 
"Bill Staffen"
Jan 2013
Pittsburgh, PA, USA
567_{8} Posts 
You don't run unstable code on big iron, silly! It's like pouring the good wine into plastic cups!

20130426, 03:57  #10  
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
2×4,201 Posts 
Yeah that is what I was thinking. That is what he was talking about, big RAM looks interesting.
Quote:
Quote:


20130426, 06:15  #11 
Jul 2003
So Cal
2^{3}·11·23 Posts 

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