YAFU Version 2.10

[kotenok2000]

At post 440 bsquared says that yafu supports gpu ecm in 2.10
https://www.mersenneforum.org/showpo...&postcount=440

[James Heinrich]

Originally Posted by bsquared

Almost forgot... external GPU-ECM binaries are now supported, optionally with Seth Trosi's CGBN enhancements. new options: "gpucurves", "cgbn", "use_gpuecm", "use_gpudev". Note that if you are using GPU-ECM with "factor()", then you'll probably want to make use of the "ext_ecm" option. This option sets when to switch over from internal non-gpu ECM to the external GPU-ECM binary. Otherwise, for example, factor() will try to use potentially thousands of GPU curves at B1=50000 when it only needs a few hundred. If you have AVX-ECM, then that will still be used as the internal ECM version before switching to external GPU-ECM.

I saw that mentioned in the changelog. Perhaps someone who knows more about it can point us in the right direction for finding out how to use said "GPU ECM", including where to find Windows binaries if they exist. Does it support both NVIDIA and AMD?

[kotenok2000]

https://download.mersenne.ca/GMP-ECM...win64-cuda.zip

[James Heinrich]

Originally Posted by kotenok2000

https://download.mersenne.ca/GMP-ECM/

Ah, yes, well, um...

Appears to be CUDA-only so I can't play around with it.

[kotenok2000]

You will need to get cudart64_80.dll file
https://download.mersenne.ca/CUDA-DLLs/CUDA-8.0

[bsquared]

Originally Posted by kotenok2000

When i run
yafu.exe "factor(3105695207255595953041248693082694537249993263358883561705428359401428617)" -p -threads 8
with use_gpuecm yafu runs siqs with one thread.

Did you Ctrl-C out of the gpu-ecm run? Threads is temporarily set to 1 to run gpu-ecm, but it should be set back to whatever it was before. A Ctrl-C might prevent it being set back.

[bsquared]

Originally Posted by James Heinrich

I saw that mentioned in the changelog. Perhaps someone who knows more about it can point us in the right direction for finding out how to use said "GPU ECM", including where to find Windows binaries if they exist. Does it support both NVIDIA and AMD?

Here's a thread for GPU-ECM.

And here's a thread for Seth Trosi's improved CGBN variant of GPU-ECM.

Both are available as compile options in gmp-ecm. Only CUDA is supported.

[kotenok2000]

I use this perl script with Strawberry Perl

[storm5510]

Originally Posted by kotenok2000

https://download.mersenne.ca/GMP-ECM...win64-cuda.zip

No sale! This does not use a GPU, at least, not mine, RTX 2080. Yes, I added the needed switches...

[kotenok2000]

Does it crash?

[James Heinrich]

Originally Posted by storm5510

This does not use a GPU, at least, not mine

Perhaps some copy-paste of YAFU output and you .ini file might help track down the problem.