The P-1 factoring CUDA program

[kriesel]

The previously posted pdf has been extended to include the effect of GPU ram size on number of relative primes processed in a pass in stage 2, for the exponents near the current primenet manual assignment issue values, ~85,000,000. (See page 4 of the attached pdf.)

Note, nrp has been observed to fluctuate from run to run on the same hardware, and/or identical GPU model on another system, for very similar exponents (examples 1GB, nrp 10 & 13; 1.5GB, 24 & 27). This may be due to some stage 2 runs beginning and selecting an NRP value while another application (mfaktc or cudalucas) was also running on the GPU and occupying some GPU ram. Values tabulated were those first obtained in testing, without attention to GPU sharing. So these values could be considered a lower bound for what should be feasible when not running other gpu applications.

NRP is very linear with available GPU ram, up to 4GB, followed by only slight increase to 8GB, in this exponent range.

[kriesel]

Originally Posted by chalsall

If a tree falls in the forest and there is no one around to hear, does it make a sound?

Yes, by definition. https://en.wikipedia.org/wiki/Sound

Slow day? Are you bored and looking to get banned or blocked again?
It would be better if you instead try to contribute something that might be useful or interesting, at least to a newbie. (Or remain below 0 db.)

[wblipp]

Originally Posted by kriesel

Yes, by definition. https://en.wikipedia.org/wiki/Sound

Also No, by definition, using the SAME link. It depends on whether you use the physics definition or the physiology definition of sound.

[kriesel]

Originally Posted by wblipp

Also No, by definition, using the SAME link. It depends on whether you use the physics definition or the physiology definition of sound.

Well, I'm an engineer, so tend to look toward the physical natural mechanisms. The speed of sound is derivable as a shock wave asymptotically approaching a pressure wave ratio of 1. Would it make sense to say there was no explosion if no one was there to be hurt? Also, I grew up on a farm, near forests, and both farm and forest held far more animals than humans. "No one" refers to humans, but many other creatures also have ears or other sense organs for acoustic signals. There is a sound (acoustic signal), even if the only potential hearer is deaf. To say otherwise is like saying that because an illiterate person looked at your message and got nothing out of it, there was no writing; or a person who doesn't understand English heard you read it, so there was no speech.

[kriesel]

Here is today's version of the list I am maintaining. As always, this is in appreciation of the authors' past contributions. Users may want to browse this for workarounds included in some of the descriptions, and for an awareness of some known pitfalls. Please respond with any comments, additions or suggestions you may have.

[Cubox]

Hi kriesel,

I am interested in running p-1 tests with my GPU, however finding information about cudap-1 is difficult.
Is there a place with updated code? The only one I can find is the one from the original author. If I understood correctly, patches have been created, I would prefer to have them applied.

The program being based on CUDALucas, I will guess that instructions are similar, but if you have any information for me in addition, that would be great!
If binaries for Windows exists, I am also happy to test.

[kriesel]

Originally Posted by Cubox

Hi kriesel,

I am interested in running p-1 tests with my GPU, however finding information about cudap-1 is difficult.
Is there a place with updated code? The only one I can find is the one from the original author. If I understood correctly, patches have been created, I would prefer to have them applied.

The program being based on CUDALucas, I will guess that instructions are similar, but if you have any information for me in addition, that would be great!
If binaries for Windows exists, I am also happy to test.

If you're referring to the bug and wish list I made, the code edits mentioned in some parts have not been turned into updated executables yet or tested & debugged.

Available software is described periodically at http://www.mersenneforum.org/showthr...t=22450&page=3

[James Heinrich]

Windows binaries for CudaPM1 are available at https://download.mersenne.ca/ but they're 5 years old.

[kriesel]

Originally Posted by Cubox

Hi kriesel,

I am interested in running p-1 tests with my GPU, however finding information about cudap-1 is difficult.
Is there a place with updated code? The only one I can find is the one from the original author. If I understood correctly, patches have been created, I would prefer to have them applied.

The program being based on CUDALucas, I will guess that instructions are similar, but if you have any information for me in addition, that would be great!
If binaries for Windows exists, I am also happy to test.

What model is your gpu?

[Cubox]

Originally Posted by James Heinrich

Windows binaries for CudaPM1 are available at https://download.mersenne.ca/ but they're 5 years old.

I saw those, and do not wish to use them. I would like to ensure the software I run is updated. This is why I am asking here about updates to this code.

Originally Posted by kriesel

What model is your gpu?

MSI GTX 1070 8G

I am running CUDALucas2.06beta at the moment, doing some double checking LLs.
The card is stable-ish. Over the 53 DC I have done, only 3 (updated, was 4 before edit) were bad. (One was a stupid overclock I did).

I am willing to compile my binaries and/or help with testing updated code if you have patches.

[Cubox]

Originally Posted by kriesel

If you're referring to the bug and wish list I made, the code edits mentioned in some parts have not been turned into updated executables yet or tested & debugged.

Available software is described periodically at http://www.mersenneforum.org/showthr...t=22450&page=3

The CUDAp-1 software mentionned in your list of mersenne hunting software pdf (very useful for newcomers!) states Jan 2016 as 'Approx date' for CUDAp-1.

https://sourceforge.net/projects/cudapm1/files/ has last code update in 2013, last binaries are from 2013 as well.