gpuOwL: an OpenCL program for Mersenne primality testing

[preda]

Originally Posted by Stef42

[Jan 29 19:11] Resuming P-1 in stage 2 with B2 from 2000000 to 456527000
[Jan 29 19:11] Inversion of stage 1 result complete, 5 transforms, 1 modular inverse. Time: 0.786 sec.
[Jan 29 19:13] M4869703 completed P-1, B1=392000, B2=465119886, Wi4: xxx

I think mprime is running the stage-2 correctly from B1=2M up to B2=465119886, but is reporting the B1 incorrectly in the result. I think George is aware of this issue and a fix is on the way (if not already released, I don't know). I was hitting the same issue myself.

[kriesel]

Originally Posted by Stef42

I needed to type everything over from the GUI

Why not click the worker window, then Edit, Copy Window, paste? (Then edit down to the portion you need to post)

[Prime95]

Originally Posted by preda

I think mprime is running the stage-2 correctly from B1=2M up to B2=465119886, but is reporting the B1 incorrectly in the result. I think George is aware of this issue and a fix is on the way (if not already released, I don't know). I was hitting the same issue myself.

Try 30.10 build 3. Let me know if it behaves better. I know I changed some behaviors at preda's request.

[Stef42]

Originally Posted by Prime95

Try 30.10 build 3. Let me know if it behaves better. I know I changed some behaviors at preda's request.

This version (on Windows - GUI) crashes right away. It does process the worktodo.add file to the worktodo.txt, but other than that doesn't work. Nothing is written to logs, so I can't (yet) help you figure out why is crashes. If you want me to run a specific command or something, please let me know! Be aware I'm on Windows.

[Prime95]

Originally Posted by Stef42

This version (on Windows - GUI) crashes right away. It does process the worktodo.add file to the worktodo.txt, but other than that doesn't work. Nothing is written to logs, so I can't (yet) help you figure out why is crashes. If you want me to run a specific command or something, please let me know! Be aware I'm on Windows.

Well that's not good. Please save the worktodo.txt and save files in case I can't figure out what is going on.

EDIT: I think I found the problem. Please try build 4 whenever that comes out.

[Stef42]

Its working quite nicely now, thanks @Prime95!

Question: why does gpuowl not support pminus1 in worktodo?
It does support Pfactor, however that way the B2 chosen by prime95 is a lot smaller, like 1/10 (less effective)

[kriesel]

Originally Posted by Stef42

Question: why does gpuowl not support pminus1 in worktodo?
It does support Pfactor, however that way the B2 chosen by prime95 is a lot smaller, like 1/10 (less effective)

Totally different code. Latest gpuowl supports doing aggressive B1, which it is good at, and passing the results to mprime/prime95 for a deep and efficient B2, which it is good at.