mersenneforum.org  

Go Back   mersenneforum.org > Extra Stuff > Miscellaneous Math

Reply
 
Thread Tools
Old 2021-03-06, 12:40   #12
tuckerkao
 
Jan 2020

23×43 Posts
Default

Quote:
Originally Posted by axn View Post
On what hardware?
I only have 1 computer at home, Intel Core i7 4930K CPU @3.40 GHz and Nvidia GeForce GTX 780 which were all purchased in year 2013.
tuckerkao is offline   Reply With Quote
Old 2021-03-06, 14:50   #13
kriesel
 
kriesel's Avatar
 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest

32·601 Posts
Default

TF depth decisions in GIMPS are properly made based on relative performance of TF, P-1, and PRP on the device doing the TF, which should whenever practical be a GPU, with high TF performance relative to the other computation types.

100M exponent TF 77-78 306.08 GHD https://www.mersenne.ca/credit.php?exponent=100000000&frombits=77&tobits=78&worktype=TF
100M exponent PRP or LL 381.39 GHD https://www.mersenne.ca/credit.php?e...78&worktype=LL

Radeon VII
TF 1113 Ghd/day, 3.712 GHD/d/W, 300 W TDP https://www.mersenne.ca/mfaktc.php
PRP 296 GHD/day, 1.053 GHD/d/W, 300 W TDP https://www.mersenne.ca/cudalucas.php
ratio TF/LL per day = 1113/296 = 3.76; log2(3.76) ~+2 bits more TF depth than for cpu factoring
306.08/1113 = 0.275 days = 6.6 hours TF 77-78 estimate on 100M exponent
381.39/296 = 1.29 days LL estimate on gpu
This gpu should be used on PRP/GEC/proof or P-1 with a recent version of gpuowl, not on TF

GTX780
TF 344 Ghd/day, 1.377 GHD/d/W, 250 W TDP https://www.mersenne.ca/mfaktc.php
LL 38.7 GHD/day, 0.166 GHD/d/W, 250 W TDP https://www.mersenne.ca/cudalucas.php
ratio TF/LL per day = 344/38.7 = 8.89; log2(8.89) ~+3 bits more TF depth than for cpu factoring
306.08/344 = 0.89 days = 21.35 hours TF 77-78 estimate
381.39/38.7 = 9.85 days estimate to LL on gpu
PRP/GEC/proof with recent gpuowl version may be a better use of this gpu than TF.
The low TF and LL GHD/d/W figures make this ~8 year old gpu a candidate for replacement or non-use on GIMPS.
https://www.techpowerup.com/gpu-spec...-gtx-780.c1701
Perhaps replace with a GTX1650, 75W TDP and save a lot on power costs; similar TF/LL ratio to the RTX2080. At $0.12/kwhr, 24/7 running, each watt of load reduction returns $1/year, paying for the upgrade in a bit over a year, a very good return on investment.

GTX1070
TF 747.6, 4.88, 150
LL 47.8, 0.34, 150
ratio TF/LL per day = 747.6/47.8 = 15.64; log2(15.64) ~+4 bits more TF depth than for cpu factoring
this gpu probably should be used on TF not P-1 or primality testing

RTX2080
TF 2623.5, 12.202, 215
LL 60.5, 0.301, 215
ratio TF/LL per day = 2623.5 / 60.5 = 43.36; log2(43.36) ~5.4 bits more TF depth than for cpu factoring
306.08/2623.5 = 0.117 days to TF 77-78 estimate for 100M exponent (2.8 hours)
381.39/60.5= 6.3 days estimate to LL
This gpu should be used on TF, not P-1 or primality testing

LL performance above and at mersenne.ca is reflective of CUDALucas, cllucas and very early gpuowl.
Faster gpuowl PRP performance with recent versions than the above shifts the tradeoff point toward less TF depth than the above, by almost 1 bit level. (In the case of Radeon VII, log2(525/296) ~0.83 bits lower.)

Last fiddled with by kriesel on 2021-03-06 at 14:51
kriesel is offline   Reply With Quote
Old 2021-03-06, 15:20   #14
axn
 
axn's Avatar
 
Jun 2003

10011110110012 Posts
Default

Quote:
Originally Posted by kriesel View Post
The low TF and LL GHD/d/W figures make this ~8 year old gpu a candidate for replacement or non-use on GIMPS.
https://www.techpowerup.com/gpu-spec...-gtx-780.c1701
Perhaps replace with a GTX1650, 75W TDP and save a lot on power costs; similar TF/LL ratio to the RTX2080. At $0.12/kwhr, 24/7 running, each watt of load reduction returns $1/year, paying for the upgrade in a bit over a year, a very good return on investment.
I second this recommendation. Upgrading to a 1650 (or 1650 super, if possible) is a quick and painless way to increase you TF thruput 3x and drastically reduce your power consumption at the same time. You might even be able to sell off the 780 and recoup a little bit of the cost.

Last fiddled with by axn on 2021-03-06 at 15:21
axn is online now   Reply With Quote
Old 2021-03-08, 11:04   #15
tuckerkao
 
Jan 2020

1010110002 Posts
Default

Quote:
Originally Posted by axn View Post
quick and painless way to increase you TF thruput 3x and drastically reduce your power consumption at the same time.
My current computer can perform P-1 factoring without too much problems. Most exponents still only require up to 2^76 of the trial factoring, so my GPU can handle those. I felt comforted because Ben Delo is finally willing to run PRP tests for lots of my exponent guesses now -

M103,353,143
https://www.mersenne.org/report_expo...exp_hi=&full=1

M103,378,153
https://www.mersenne.org/report_expo...exp_hi=&full=1

M103,427,143
https://www.mersenne.org/report_expo...exp_hi=&full=1

M103,674,113
https://www.mersenne.org/report_expo...exp_hi=&full=1

M103,737,103 and M103,737,143 and M103,737,173
https://www.mersenne.org/report_expo...3737173&full=1

Last fiddled with by tuckerkao on 2021-03-08 at 11:09
tuckerkao is offline   Reply With Quote
Old 2021-03-08, 11:13   #16
Viliam Furik
 
"Viliam Furík"
Jul 2018
Martin, Slovakia

2×5×61 Posts
Default

Quote:
Originally Posted by tuckerkao View Post
I felt comforted because Ben Delo is finally willing to run PRP tests for lots of my exponent guesses now
How many times do people have to explain it to you? Ben Delo is not "willing to run PRP tests for your guesses". He probably doesn't even know you exist, because he is not an active forum user. He just has a lot of AWS machines that get assigned many exponents, including your guesses.

He is willing to run PRP tests for GIMPS. Not for you.
Viliam Furik is offline   Reply With Quote
Old 2021-03-08, 11:15   #17
tuckerkao
 
Jan 2020

23·43 Posts
Default

Ben Delo skipped M103,737,157 and M103,737,167, this cannot be the coincidence. As far as I understand, he goes by the numerical orders, not jumping around during the regular situation especially when these.2 exponents are not assigned to other people.

Okay, I finished up the P-1 factoring for M103,358,341 around 6 minutes ago and Ben Delo just picked it up several seconds before I edit this comment, he didn't take any other exponents between M103,358,000 and M103,359.000 -
https://www.mersenne.org/report_expo...exp_hi=&full=1

If these were the random server assignments, he would be on numerous exponents across the several thousand blocks, not only on my guesses. Unless you are informing me that I have the invisible fingers which can magically type those exponents into Ben Delo's computers through the Space Impaler thousands of miles away.

Last fiddled with by tuckerkao on 2021-03-08 at 11:57
tuckerkao is offline   Reply With Quote
Old 2021-03-08, 14:05   #18
kriesel
 
kriesel's Avatar
 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest

32×601 Posts
Default

https://en.wikipedia.org/wiki/Grandiose_delusions
https://rationalwiki.org/wiki/Don%27t_feed_the_Troll

Ben Delo and many others run mprime or prime95 via PrimeNet connection. It's likely Ben does not see much less select his many many assignments. Billionaires have far more enjoyable ways to spend their time. For throughput of order Ben Delo or curtisc level, lots of scripting runs the show.
kriesel is offline   Reply With Quote
Old 2021-03-08, 15:08   #19
Viliam Furik
 
"Viliam Furík"
Jul 2018
Martin, Slovakia

2×5×61 Posts
Default

Quote:
Originally Posted by tuckerkao View Post
Ben Delo skipped M103,737,157 and M103,737,167, this cannot be the coincidence. As far as I understand, he goes by the numerical orders, not jumping around during the regular situation especially when these.2 exponents are not assigned to other people.
That's most probably because these exponents don't have P-1 done, yet.

He gets what PrimeNet gives him, please, correct your knowledge.
Viliam Furik is offline   Reply With Quote
Old 2021-03-08, 15:14   #20
Happy5214
 
Happy5214's Avatar
 
"Alexander"
Nov 2008
The Alamo City

23·3·29 Posts
Default

Unless any GIMPS users happen to know you personally, the only contributors to the project who know anything about you are the unfortunate forumites who have to sit here and watch you bloviate about your supposed hold on our top crunchers, who needless to say don't fall into either category. Nobody in GIMPS is your personal PRP tester. We contribute because we want to, and we help others (when we do) because we want to. Ben Delo just does a ton of PRP tests, which happens to include your exponents. He has no idea he's doing your exponents. He doesn't know who you are. He's just doing a huge service to GIMPS and the mathematical community. To PrimeNet, you are just another user (don't get me wrong, every useful GHz-day helps), and the fact that you did part of the TF has no bearing on the future assignments of those exponents.

Last fiddled with by Happy5214 on 2021-03-08 at 15:24 Reason: Expand
Happy5214 is offline   Reply With Quote
Old 2021-03-08, 21:53   #21
tuckerkao
 
Jan 2020

23·43 Posts
Default

Quote:
Originally Posted by Viliam Furik View Post
That's most probably because these exponents don't have P-1 done, yet.

He gets what PrimeNet gives him, please, correct your knowledge.
No doubt why curtisc is still running the PRP test for this already known composite number -
https://www.mersenne.org/report_expo...exp_hi=&full=1

I'll try to finish up the P-1 factoring for more of my exponent guesses, so the server will assign them for more billionaire PRP tests, cannot miss the opportunities.

Last fiddled with by tuckerkao on 2021-03-08 at 22:09
tuckerkao is offline   Reply With Quote
Old 2021-03-08, 22:08   #22
Viliam Furik
 
"Viliam Furík"
Jul 2018
Martin, Slovakia

61010 Posts
Default

Quote:
Originally Posted by tuckerkao View Post
No doubt why curtisc is still running the PRP test for this already known composite number -
https://www.mersenne.org/report_expo...exp_hi=&full=1
One of the many computers that are being used at the school where he works simply didn't get the news of it being factored... That happens.
Viliam Furik is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Automatic fetch of Trial Factoring work for GPU mfakt* LaurV GPU to 72 81 2020-12-02 05:17
Simple Script to get Trial Factoring Work jfamestad PrimeNet 3 2016-11-06 20:32
Why trial factoring work chopped into chunks? lidocorc PrimeNet 4 2008-11-06 18:48
How does the trial factoring work with 15K*2^n-1 jocelynl 15k Search 0 2003-07-11 14:23
How does trial-factoring work? ThomRuley Software 5 2003-05-30 20:34

All times are UTC. The time now is 12:33.


Thu Jul 29 12:33:08 UTC 2021 up 6 days, 7:02, 0 users, load averages: 2.23, 2.23, 2.22

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.