20100106, 22:50  #1 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
3×11×157 Posts 
If I may make a request on behalf of 32 bit PCs
There have been several posters that have noted that older 32 Bit hardware (PIII, Duron, etc) actually perform pretty decent doing TF up to BUT NOT above 64 bits. Doing TF above 64 bits or LL/DC work drops their thruput in half.
Coupled with that the currest published Primenet server default TFLMH assignment rules assign exponents below 400M up to 64 bits. Any exponent 400M and above get TFLMH assignments to 65 bits. As defined above the work up to 64 bits completes at thruput "X" and from 6465 bits at 1/2"X". Once all exponents are TF'd to 64 bits all these machines drop in thruput by 50%. So what I am so humbly asking is that for those of you with 64 bit PCs that are assigning your own TF work below 64 bits is to consider taking exponents at 400M and above and leaving those lower to the 32 bit PCs Thanks for your time. Last fiddled with by petrw1 on 20100106 at 22:51 
20100106, 23:14  #2 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
13·809 Posts 
There are several users that hit hard in that range.
Torchwood Institute Tydus linded monst GIMPS Visualization Some may not read the forum. You may be able to contact them directly. 
20100107, 00:32  #3 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
12075_{8} Posts 
Thanks...the biggest by far is GV (aka Chalsall) who is a frequenter of this forum; and I have seen monst on this forum too. The other three are newer and may not have found it yet.

20100107, 01:14  #4 
Feb 2009
21_{16} Posts 
Almost all of linded's TF <= 64 bits is on PIIIs. I have been doing this ever since we noticed the performance issue doing TF above 64. We just happen to have about 60 of them going.

20100107, 04:51  #5 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
143D_{16} Posts 

20100111, 14:12  #6  
If I May
"Chris Halsall"
Sep 2002
Barbados
10446_{10} Posts 
Quote:
However, in the interests of cooperation, I have instructed my cluster to work in the 800M to 900M range, and will stay above 400M. 

20100111, 17:29  #7  
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
143D_{16} Posts 
Quote:
But thanks... 

20100112, 00:53  #8 
If I May
"Chris Halsall"
Sep 2002
Barbados
2·3·1,741 Posts 

20100112, 02:01  #9 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
3×11×157 Posts 
I'm really NOT trying to tell people what they should or shouldn't do; it up to them.
I am just suggesting that once there are no more <64 bit TF assignments left then many (probably hundreds of) 32 bit machines thruput will be cut in half and along with that their ability to contribute most effectively to this project. This includes Intel PIII, AMD Duron, etc. My PIII and Duron both take 4 times as long to complete TF from 64 to 65 bits as from 63 to 64 for only double the credits. This observation has been confirmed several times by others on this forum recently. By the way these same 32 bit machines perform just as poorly at all other work types as they do at TF above 2^64. On the other hand most (all?) 64 bit PC's effectiveness doing TF does not diminish whether to 58 bits or 68 bits. So the more 64 Bit PC's that take TF at 2^64 and above then the longer the most useful life of the 32 bit machines will be....without impacting the effectiveness of the 64 bit PC's IMHO... Last fiddled with by petrw1 on 20100112 at 02:03 Reason: Wording 
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