ECM for CUDA GPUs in latest GMP-ECM ? - Page 28

Karl M Johnson · 2014-10-20, 18:11

Oh, this thread is certainly alive.
Is there a page with gmp-ecm CUDA binaries for Windows?

diep · 2014-12-06, 21:06

Hi, would this work for 69 * 2 ^ n - 1 ?

I would want to give it a shot at n > 4 million if there is any hope it can work for it efficiently...

Thanks, Vincent

wombatman · 2014-12-06, 22:18

GPU-ECM is limited to 2^1018-1 (~300 digits).

henryzz · 2014-12-25, 16:54

Just got a new 750 Ti. I am trying to get ecm_gpu to work but it keeps on crashing for me. It seems to work with very small values of B1(2000 is around the peak). Is there something I am missing? mfaktc works.
I am using the binary in post 243.
Is it possible that the binary uses cpu instructions I don't have on my core2? I would guess it wouldn't work at all if that was the case.

xilman · 2014-12-25, 21:12

Quote:

Originally Posted by henryzz

Just got a new 750 Ti. I am trying to get ecm_gpu to work but it keeps on crashing for me. It seems to work with very small values of B1(2000 is around the peak). Is there something I am missing? mfaktc works.
I am using the binary in post 243.
Is it possible that the binary uses cpu instructions I don't have on my core2? I would guess it wouldn't work at all if that was the case.

Have you tried rebuilding from a completely clean distro? Sometimes it's too easy to screw up the config options.

henryzz · 2014-12-25, 21:54

Quote:

Originally Posted by xilman

Have you tried rebuilding from a completely clean distro? Sometimes it's too easy to screw up the config options.

It wasn't me that compiled the binary.

mfaktc worked out of the box. Do I need to compile the gmp-ecm binary myself?

Just realized I never specified that I was working on windows apart from the binary I referenced.

If there are instructions somewhere on the forum for installing cuda for linux that would be useful for the occasion I am on there. Windows is what I am really bothered with though.

wombatman · 2014-12-25, 23:08

Henry, that binary I made probably is using instructions that the core2 doesn't have. It was compiled in VS2012 on an Ivy Bridge-E.

henryzz · 2014-12-25, 23:55

Quote:

Originally Posted by wombatman

Henry, that binary I made probably is using instructions that the core2 doesn't have. It was compiled in VS2012 on an Ivy Bridge-E.

I will attempt to set up VS2012 Express with CUDA tomorrow. I haven't had much success getting MPIR and GMP_ECM working well together under VS in the past. Hopefully it is easier now.

wombatman · 2014-12-26, 00:31

I found the MPIR build to be very simple to run (this was version 2.7.0). That is, I was able to open the solution file and pretty much build straight away without any major changes. Setting up the GPU_ECM project is a little more involved in that you have to change a number of things (paths to MPIR, etc), but isn't too bad.

henryzz · 2014-12-26, 23:51

Getting mpir and ecm to compile was easy. I still haven't managed to get the gpu version to compile without error.
Getting various errors among the standard headers for some reason.

Is anyone able to compile a gpu version of ecm and msieve that should work on my system? (750 Ti and Q6600)
It seems something is screwed up on my system.

chris2be8 · 2015-04-24, 16:07

Has anyone tested if ecm-gpu works correctly if you reduce ECM_GPU_SIZE_DIGIT to 16 bits (the default's 32)? Or got any performance figures for it?

I've searched the ecm-discuss mailing list archives but couldn't find any mention of it.

Chris

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2014-10-20, 18:11	#298
Karl M Johnson Mar 2010 3×137 Posts	Oh, this thread is certainly alive. Is there a page with gmp-ecm CUDA binaries for Windows?

2014-12-06, 21:06	#299
diep Sep 2006 The Netherlands 1331₈ Posts	Hi, would this work for 69 * 2 ^ n - 1 ? I would want to give it a shot at n > 4 million if there is any hope it can work for it efficiently... Thanks, Vincent

2014-12-06, 22:18	#300
wombatman I moo ablest echo power! May 2013 13·137 Posts	GPU-ECM is limited to 2^1018-1 (~300 digits).

2014-12-25, 16:54	#301
henryzz Just call me Henry "David" Sep 2007 Cambridge (GMT/BST) 2×3³×109 Posts	Just got a new 750 Ti. I am trying to get ecm_gpu to work but it keeps on crashing for me. It seems to work with very small values of B1(2000 is around the peak). Is there something I am missing? mfaktc works. I am using the binary in post 243. Is it possible that the binary uses cpu instructions I don't have on my core2? I would guess it wouldn't work at all if that was the case.

2014-12-25, 23:08	#304
wombatman I moo ablest echo power! May 2013 13×137 Posts	Henry, that binary I made probably is using instructions that the core2 doesn't have. It was compiled in VS2012 on an Ivy Bridge-E.

2014-12-26, 00:31	#306
wombatman I moo ablest echo power! May 2013 13·137 Posts	I found the MPIR build to be very simple to run (this was version 2.7.0). That is, I was able to open the solution file and pretty much build straight away without any major changes. Setting up the GPU_ECM project is a little more involved in that you have to change a number of things (paths to MPIR, etc), but isn't too bad.

2014-12-26, 23:51	#307
henryzz Just call me Henry "David" Sep 2007 Cambridge (GMT/BST) 2×3³×109 Posts	Getting mpir and ecm to compile was easy. I still haven't managed to get the gpu version to compile without error. Getting various errors among the standard headers for some reason. Is anyone able to compile a gpu version of ecm and msieve that should work on my system? (750 Ti and Q6600) It seems something is screwed up on my system.

2015-04-24, 16:07	#308
chris2be8 Sep 2009 2⁴·131 Posts	Has anyone tested if ecm-gpu works correctly if you reduce ECM_GPU_SIZE_DIGIT to 16 bits (the default's 32)? Or got any performance figures for it? I've searched the ecm-discuss mailing list archives but couldn't find any mention of it. Chris