20051126, 14:20  #1 
Feb 2003
Istanbul
52_{10} Posts 
which program?
for LLRing which program is best for...
Pentium M (2 MB cache) Pentium 4 prescott Pentium 4 D (64 bit) and for for sieving which mode is best for... Pentium M Pentium 3 are the residuals same for LLR3.6.2 and PRP24.14? thanks drakkar67 
20051126, 14:39  #2 
Apr 2003
304_{16} Posts 
For PRPing i use PRP24.14 but with the new llr3.6.2 version both applications should be at the same speed again. The residues are not identical. That is one of the reasons why at PSP there will be no automated second pass testing. Tests should be assigned to machines running the same application type.
Idtentical residues are produced by Group 1: winpfgw ( not used for PSP anymore) Group 2: prp (all versions) llr version <=3.1 ( version not used anymore as it is much slower) Group 3: llr >=3.5 llrnet I have no idea which programm is fastest on which platform at the moment. For sieving my best experiences have been with proth_sieve_cmov on PIII and all AMD starting with the "TB" design For the Pentium M i made no tests but due to the fact that it is relative slow on PRP i think the cmov version should be best. Lars 
20051126, 16:55  #3 
Feb 2003
Istanbul
2^{2}·13 Posts 
thanks Lars

20051126, 23:37  #4 
Jun 2003
1,579 Posts 
Pentium M and P4's should be used with PRP and not for sieving. Sieving does not use their full potential.
As for the fastest program, the latest PRP and LLR work at the same speed, so it is your choice to make. (Winpfgw, proth.exe are much slower and should be avoided) Citrix Last fiddled with by Citrix on 20051126 at 23:39 
20051127, 15:58  #5 
Feb 2003
Istanbul
2^{2}·13 Posts 
My notebook with Pentium M 1.6 is very slow on PRP tests. IMHO at this sieve depth it is more useful at sieving.
It's now PRPing at about 7 hours per test (3,5 PRP a day). I tried it at 11200 sieve depth and found about 100 factors a day (but I don't know exactly). 01 M...2 factors 12 M...5 factors 220 M...no factors, I donno why but maybe it was sieved w/220 M 2050 M...about 90 factors So my notebook factors 5 pairs a day effectively. It's better than PRPing 3,5 pairs. It's now PRP'ing the 1703000 range. After finishing that range I may give it a sieving range, I haven't decided yet. drakkar67 
20051128, 07:00  #6 
Jun 2003
1,579 Posts 
But if you PRP, you might find a prime and eliminate a few 100,000 candidates.
Anyway, the timming for your Pentium M sounds right, that is how long a PRP test takes. Citrix 
20051128, 08:43  #7  
May 2005
Copenhagen, Denmark
17^{2} Posts 
Quote:
I've currently put it on sieving 50K/G/T/whatever letter is usedchunks. Should I rather put it at PRP'ing? 

20051128, 08:54  #8 
Jun 2003
1,579 Posts 
I think a Pentium M has a Pentium 4 design and should be equally slow for sieving. So PRP should be the best.
But for right now putting the PC on sieving is not a bad idea since getting to 15T is slightly more important than finding a prime. Hope this makes sense. Citrix 
20051128, 09:54  #9  
Jun 2003
13^{2}·29 Posts 
Quote:
EDIT: Can someone post some timings for PM and P4 in both sieving and PRP? That should conclusively tell us which is good for what! Last fiddled with by axn on 20051128 at 09:55 

20051128, 11:22  #10 
Jul 2004
Potsdam, Germany
3×277 Posts 
I have a PentiumM 1.7 GHz, which does 320 kp/s.
My Pentium4 2.4 GHz does 200 kp/s. But when running PRP concurrently, the sieving rate only drops to 156 kp/s  showing that there is still a lot of room for improvement. PRP speed drops to 50%, compared to the notsieving situation. I have no comparisons for PRP, but from what I've heard of GIMPS, PM and P4 basically have the same performance per clock, which sounds sensible, because the SSE2 engine is used most of the time. IMHO, a PM should definitely sieve. Last fiddled with by Mystwalker on 20051128 at 11:24 
20051128, 13:09  #11 
Feb 2003
Istanbul
2^{2}·13 Posts 
My PM 1.6 (2 MB L2),
sieving 330335 kp/s (in SSE2 mode, with 050 M SoB.dat, in 1120011300 range) PRP test about 16 ms/iteration (192 K FFT) (it may be better at high FFT ranges, but we have much time to reach them) My P4 1.6 (512 K L2), PRP test about 910 ms/iteration (192 K FFT) My P4 celeron 2.4 (256 K L2), PRP test about 7.58 ms/iteration (192 K FFT) (I think it may slow down greatly for PRP>256 K FFT) None of them overclocked. Upto 15000 range PM may be better at sieving but mine will PRP at least a week until it finishes its range. drakkar 
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