mersenneforum.org  

Go Back   mersenneforum.org > Search Forums

Showing results 1 to 25 of 1000
Search took 0.42 seconds.
Search: Posts Made By: paulunderwood
Forum: Miscellaneous Math 2020-05-23, 18:38
Replies: 17
Views: 513
Posted By paulunderwood
Is it 3 mod 4? How many tons of coal are...

Is it 3 mod 4?

How many tons of coal are needed to LL test it?

What do you calculate the "chance" of being prime is?

Let me give you an example prime p=2^82589933-1 definitely has no small...
Forum: Miscellaneous Math 2020-05-23, 14:15
Replies: 17
Views: 513
Posted By paulunderwood
The "8" --> "10" in the exponent would be beyond...

The "8" --> "10" in the exponent would be beyond expectation. It would take a day on a GPU you to dismiss this claim, assuming P-1 does not turn up a factor.
Forum: Programming 2020-05-22, 21:09
Replies: 5
Views: 247
Posted By paulunderwood
We need to put it to the test with a...

We need to put it to the test with a (b^n-1)/(b-1) number of considerable size not necessarily prime.

./llr64 -q"(10^49081-1)/9" -t4
Invalid expression in command line.


./pfgw64...
Forum: GPU Computing 2020-05-18, 22:40
Replies: 264
Views: 12,789
Posted By paulunderwood
Congrats on getting you 3-GPU rig running. With...

Congrats on getting you 3-GPU rig running. With the one on your Haswell that is equivalent to ~40x 4 core CPUs but far more efficient in power usage and overall size. Now you should soon be propelled...
Forum: Linux 2020-05-15, 03:40
Replies: 5
Views: 325
Posted By paulunderwood
I had a "crazy" network recently. It turned out...

I had a "crazy" network recently. It turned out to be a half-in LAN cable on one of the machines on my network.
Forum: GPU Computing 2020-05-15, 00:29
Replies: 264
Views: 12,789
Posted By paulunderwood
Does id say you are in the video group? If not do...

Does id say you are in the video group? If not do sudo usermod -aG video emayer (if that is your username) and logout and back in and run id again to see.
Forum: GPU Computing 2020-05-14, 20:53
Replies: 264
Views: 12,789
Posted By paulunderwood
:davar55: I run gpuowl as root on Buster;...

:davar55: I run gpuowl as root on Buster; Everything else as a user, apart from admin stuff :wink:
Forum: GPU Computing 2020-05-14, 20:02
Replies: 264
Views: 12,789
Posted By paulunderwood
It's ugly, but see here...

It's ugly, but see here (https://mersenneforum.org/showthread.php?t=25065&highlight=sudo&page=2) on how to run without sudo.
Forum: GPU Computing 2020-05-14, 19:42
Replies: 264
Views: 12,789
Posted By paulunderwood
Don't you need to prefix with a sudo command?

Don't you need to prefix with a sudo command?
Forum: GPU Computing 2020-05-14, 19:26
Replies: 264
Views: 12,789
Posted By paulunderwood
What does uname -a give? Are you using rocm v3.3?...

What does uname -a give? Are you using rocm v3.3? What command are you issuing to try and run gpuowl?
Forum: GPU Computing 2020-05-13, 22:00
Replies: 264
Views: 12,789
Posted By paulunderwood
2. I am glad you got the rig working with one...

2. I am glad you got the rig working with one card. Measure the wall wattage carefully at --setsclk 3. When you install all three GPUs you want to stay in safe limits, otherwise things will fry! Have...
Forum: Miscellaneous Math 2020-05-13, 18:03
Replies: 16
Views: 333
Posted By paulunderwood
If you taking about how long it takes to wrtie...

If you taking about how long it takes to wrtie the number to file: The following takes ~1 ms with Pari/GP (https://pari.math.u-bordeaux.fr/download.html):
...
Forum: Programming 2020-05-13, 17:51
Replies: 5
Views: 247
Posted By paulunderwood
You need to generate a list to input to LLR. ...

You need to generate a list to input to LLR.

Why bother? PFGW is much better at this sort of thing.

More from the documentation:
Forum: Programming 2020-05-13, 17:38
Replies: 5
Views: 247
Posted By paulunderwood
Run it through PFGW downloaded from sourceforge...

Run it through PFGW downloaded from sourceforge and use the -f switch for trial factoring if necessary.

From pfgwdoc.txt:
Forum: Prime Wiki 2020-05-13, 16:49
Replies: 157
Sticky: Prime-Wiki
Views: 10,587
Posted By paulunderwood
This is a list of the top20s...

This is a list of the top20s (https://primes.utm.edu/top20/index.php).

This gives the thresholds (https://primes.utm.edu/top20/sizes.php).
Forum: Miscellaneous Math 2020-05-13, 14:29
Replies: 16
Views: 333
Posted By paulunderwood
Just to expand on your "in almost very case"....

Just to expand on your "in almost very case". PRP'ing a huge partitions number is quicker than computing its decimal digits (with the latest Pari/GP version). Proving it prime or even checking the...
Forum: GPU Computing 2020-05-13, 03:34
Replies: 264
Views: 12,789
Posted By paulunderwood
On my Debian system which is similar to Ubuntu: ...

On my Debian system which is similar to Ubuntu:

apt-cache search libOpenCL
ocl-icd-libopencl1 - Generic OpenCL ICD Loader
nvidia-libopencl1 - NVIDIA OpenCL ICD Loader library...
Forum: GPU Computing 2020-05-13, 03:22
Replies: 264
Views: 12,789
Posted By paulunderwood
@ernst, I am glad your found the source of the...

@ernst, I am glad your found the source of the hardware problem albeit frustrating, especially when you could have double checked the vga-hdmi gadget before you bought the Celeron system. We have all...
Forum: Miscellaneous Math 2020-05-12, 05:35
Replies: 79
Views: 4,900
Posted By paulunderwood
Another idea

{forprime(p=3,30000000000,if(
Mod(Mod(1,p+17)*x+2,x^2-3)^lift(Mod(2,p+1)^p)==1&&
Mod(Mod(1,p+257)*x+2,x^2-3)^lift(Mod(2,p+1)^p)==1&&
Mod(Mod(1,p+65537)*x+2,x^2-3)^lift(Mod(2,p+1)^p)==1,...
Forum: Software 2020-05-12, 05:09
Replies: 4
Views: 174
Posted By paulunderwood
A 3990x will necessary to certify R49081...

A 3990x will necessary to certify R49081 (http://www.elektrosoft.it/matematica/repunit/R49081-4.pdf) in a timely manner when Marcel upgrades Primo.

As for my Opteron System: It stopped working and...
Forum: Software 2020-05-11, 09:07
Replies: 4
Views: 174
Posted By paulunderwood
ECPP is O(ln(n)^(4+eps)) meaning a doubling in...

ECPP is O(ln(n)^(4+eps)) meaning a doubling in length takes 16 times as long. This can be helped by having a many-core system.

It took me 21.5 months to certify a 40000 digit number on a 48 core...
Forum: GPU Computing 2020-05-07, 18:35
Replies: 2,234
Views: 116,208
Posted By paulunderwood
Yes, I meant µs. But how do I generate mu with...

Yes, I meant µs. But how do I generate mu with the keyboard easily?

nvm: I found this on how to do it Gnome (https://www.maketecheasier.com/quickly-type-special-characters-linux/) without having...
Forum: GPU Computing 2020-05-07, 05:49
Replies: 2,234
Views: 116,208
Posted By paulunderwood
Was ~1200us/it (103.9M) and ~1800us/it (104.9M). ...

Was ~1200us/it (103.9M) and ~1800us/it (104.9M).

Now 1440us/it each -- both at 104.9M.
Forum: Hardware 2020-05-06, 20:36
Replies: 21
Views: 662
Posted By paulunderwood
I know. Taking electricity costs into account is...

I know. Taking electricity costs into account is a must. One could replace the components of some older boxen, Keeping the box, PSU, mains cable, graphics and disk, and replace the CPU, board and...
Forum: Hardware 2020-05-06, 18:52
Replies: 21
Views: 662
Posted By paulunderwood
You can't beat the investment into a Radeon, but...

You can't beat the investment into a Radeon, but for LLR the 9100f gives quite a bang for the buck. LGA 115A v2 boards are fairly cheap -- I have a MSI. When you take into account electricity costs...
Showing results 1 to 25 of 1000

 
All times are UTC. The time now is 02:47.

Mon May 25 02:47:57 UTC 2020 up 61 days, 21 mins, 0 users, load averages: 1.82, 1.50, 1.34

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.