mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Hardware > GPU Computing > GpuOwl

Reply
 
Thread Tools
Old 2020-11-10, 22:48   #2597
preda
 
preda's Avatar
 
"Mihai Preda"
Apr 2015

1,327 Posts
Default

Quote:
Originally Posted by kriesel View Post
If 3570 meant this, perhaps the igp suddenly began to show up as an available OpenCL device. (HD2500 listed as a device in gpuowl -h output?)
Nice detective work! (yes, that sounds like a reasonable explanation)
preda is online now   Reply With Quote
Old 2020-11-13, 19:39   #2598
ixfd64
Bemusing Prompter
 
ixfd64's Avatar
 
"Danny"
Dec 2002
California

7×331 Posts
Default

I noticed something a little weird. A factor for 104011507 was recently found by P-1 with B1=5,000,000. However, mersenne.ca shows that the largest factor of k is 5,902,627 — which is above the B1 value. Is gpuOwl somehow able to find factors outside the given bounds?

Or at least I'm assuming this factor was found with gpuOwl given how long it would take on a CPU. I know that the Brent–Suyama extension can be used to find factors outside given ranges, but it's my understanding that it only applies when stage 2 is used.

Last fiddled with by ixfd64 on 2020-11-13 at 19:40
ixfd64 is offline   Reply With Quote
Old 2020-11-13, 20:10   #2599
preda
 
preda's Avatar
 
"Mihai Preda"
Apr 2015

52F16 Posts
Default

Quote:
Originally Posted by ixfd64 View Post
I noticed something a little weird. A factor for 104011507 was recently found by P-1 with B1=5,000,000. However, mersenne.ca shows that the largest factor of k is 5,902,627 — which is above the B1 value. Is gpuOwl somehow able to find factors outside the given bounds?

Or at least I'm assuming this factor was found with gpuOwl given how long it would take on a CPU. I know that the Brent–Suyama extension can be used to find factors outside given ranges, but it's my understanding that it only applies when stage 2 is used.
It is simply misreporting from GpuOwl: when it finds a P-1 factor, the part that writes the result doesn't know anymore whether it was found in stage1 or in stage2. It could write the result with both B1 and B2, but this is interpreted by the server as implying "found in stage2", and results in allocating a larger credit. So to be conservatory relative to the credit, only B1 is reported (which implies "found in stage1" and results in a bit lower credit).

I should probably fix this when I get to it.

You are correct, there is no way to find in stage1 a factor larger than B1 (there is no BS analogue for stage1); in addition, GpuOwl does not use BS in stage2.
preda is online now   Reply With Quote
Old 2020-11-13, 20:55   #2600
ixfd64
Bemusing Prompter
 
ixfd64's Avatar
 
"Danny"
Dec 2002
California

44158 Posts
Default

I see, thanks for the explanation. On a related note, are there any plans to implement the Brent–Suyama extension in the future?
ixfd64 is offline   Reply With Quote
Old 2020-11-13, 22:57   #2601
preda
 
preda's Avatar
 
"Mihai Preda"
Apr 2015

132710 Posts
Default

Quote:
Originally Posted by ixfd64 View Post
I see, thanks for the explanation. On a related note, are there any plans to implement the Brent–Suyama extension in the future?
Not ATM. Based on the information available, it is more efficient to run with a higher B2 than to use BS (for the same amount of compute in P2).
preda is online now   Reply With Quote
Old 2020-11-14, 05:19   #2602
Xyzzy
 
Xyzzy's Avatar
 
"Mike"
Aug 2002

33·172 Posts
Default

This is with the default fan and power profile.
Code:
2020-11-13 22:00:58 GeForce RTX 3080-0 OpenCL compilation in 1.32 s
2020-11-13 22:00:59 GeForce RTX 3080-0 77936867 OK        0 loaded: blockSize 400, 0000000000000003
2020-11-13 22:01:01 GeForce RTX 3080-0 77936867 OK      800   0.00%; 1925 us/it; ETA 1d 17:41; 1579c241dc63eca6 (check 0.80s)
2020-11-13 22:07:31 GeForce RTX 3080-0 77936867 OK   200000   0.26%; 1954 us/it; ETA 1d 18:12; f0b04b45b0855bd2 (check 0.81s)
2020-11-13 22:14:05 GeForce RTX 3080-0 77936867 OK   400000   0.51%; 1966 us/it; ETA 1d 18:21; c03f94396a5aa29e (check 0.81s)
2020-11-13 22:20:37 GeForce RTX 3080-0 77936867 OK   600000   0.77%; 1954 us/it; ETA 1d 17:59; b9decd65ca71b629 (check 0.81s)
Attached Thumbnails
Click image for larger version

Name:	gpuowl1.png
Views:	24
Size:	37.4 KB
ID:	23773   Click image for larger version

Name:	gpuowl2.png
Views:	20
Size:	102.7 KB
ID:	23774  
Xyzzy is offline   Reply With Quote
Old 2020-11-14, 09:35   #2603
moebius
 
moebius's Avatar
 
Jul 2009
Germany

1110000002 Posts
Default

Quote:
Originally Posted by Xyzzy View Post
Code:
GeForce RTX 3080
Unfortunately still not better than the RTX 2080 TI.But, the RTX 3080 TI should appear on the market in January 2021
Ranking List
Attached Thumbnails
Click image for larger version

Name:	toplist.jpg
Views:	94
Size:	337.2 KB
ID:	23778  

Last fiddled with by moebius on 2020-11-14 at 10:22
moebius is online now   Reply With Quote
Old 2020-11-16, 15:07   #2604
moebius
 
moebius's Avatar
 
Jul 2009
Germany

44810 Posts
Default

Quote:
Originally Posted by moebius View Post
The launch is likely to be on November 16, 2020 but with up to 12.5 TFLOPs FP64?
real specifications http://www.digitaljournal.com/pr/4879636

price: around US-$ 6400
moebius is online now   Reply With Quote
Old 2020-11-16, 15:20   #2605
M344587487
 
M344587487's Avatar
 
"Composite as Heck"
Oct 2017

2B816 Posts
Default

https://www.servethehome.com/amd-rad...-gpu-launched/


Based on the slides it should be 56-65% the cost of an A100, your number looks about right. The chance of a consumer version is ~0%, but there may be a pro variant. The poorly binned dies have to go somewhere, maybe there'll be an MI90 instead which would be a sad development.
M344587487 is offline   Reply With Quote
Old 2020-11-20, 19:54   #2606
Xyzzy
 
Xyzzy's Avatar
 
"Mike"
Aug 2002

33·172 Posts
Default

RX 5500XT
Code:
2020-11-20 13:08:06 gfx1012-0 OpenCL compilation in 2.57 s
2020-11-20 13:08:07 gfx1012-0 79334869 OK        0 loaded: blockSize 400, 0000000000000003
2020-11-20 13:08:11 gfx1012-0 79334869 OK      800   0.00%; 3287 us/it; ETA 3d 00:26; 0b08957c2d2b3130 (check 1.37s)
2020-11-20 13:19:01 gfx1012-0 79334869 OK   200000   0.25%; 3279 us/it; ETA 3d 00:05; 79983c264372e180 (check 1.35s)
2020-11-20 13:29:56 gfx1012-0 79334869 OK   400000   0.50%; 3272 us/it; ETA 2d 23:45; 76c411b78b92c115 (check 1.35s)
2020-11-20 13:40:52 gfx1012-0 79334869 OK   600000   0.76%; 3272 us/it; ETA 2d 23:34; 2e03b6c89817762d (check 1.35s)
Xyzzy is offline   Reply With Quote
Old 2020-11-20, 20:35   #2607
moebius
 
moebius's Avatar
 
Jul 2009
Germany

26×7 Posts
Default

Quote:
Originally Posted by Xyzzy View Post
RX 5500XT
https://mersenneforum.org/showpost.p...postcount=2547
Thank you, a forum user has slightly better values ​​for the AMD RX 5500 XT, but I think Sapphire is the measure of all things. The exponent is also not exactly the same.

Last fiddled with by moebius on 2020-11-20 at 20:37
moebius is online now   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
mfakto: an OpenCL program for Mersenne prefactoring Bdot GPU Computing 1657 2020-10-27 01:23
GPUOWL AMD Windows OpenCL issues xx005fs GpuOwl 0 2019-07-26 21:37
Testing an expression for primality 1260 Software 17 2015-08-28 01:35
Testing Mersenne cofactors for primality? CRGreathouse Computer Science & Computational Number Theory 18 2013-06-08 19:12
Primality-testing program with multiple types of moduli (PFGW-related) Unregistered Information & Answers 4 2006-10-04 22:38

All times are UTC. The time now is 12:36.

Tue Nov 24 12:36:20 UTC 2020 up 75 days, 9:47, 4 users, load averages: 1.64, 1.67, 1.55

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, 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.