mfaktc: a CUDA program for Mersenne prefactoring - Page 120

delta_t · 2011-10-25, 07:56

Nvidia released a new driver, 285.62, and looks like it has CUDA 4.10. I just installed it on my computer with a GTX 460M and the current win64 mfaktc (compiled under CUDA 3.2) is working fine. I haven't tried CUDALucas yet, but I figured many CUDALucas people check this thread, so perhaps one of you can test and report in that thread?

ET_ · 2011-10-25, 12:21

Quote:

Originally Posted by delta_t

Nvidia released a new driver, 285.62, and looks like it has CUDA 4.10. I just installed it on my computer with a GTX 460M and the current win64 mfaktc (compiled under CUDA 3.2) is working fine. I haven't tried CUDALucas yet, but I figured many CUDALucas people check this thread, so perhaps one of you can test and report in that thread?

Did you see any differences in timings?

Luigi

bcp19 · 2011-10-25, 16:31

Quote:

Originally Posted by delta_t

Nvidia released a new driver, 285.62, and looks like it has CUDA 4.10. I just installed it on my computer with a GTX 460M and the current win64 mfaktc (compiled under CUDA 3.2) is working fine. I haven't tried CUDALucas yet, but I figured many CUDALucas people check this thread, so perhaps one of you can test and report in that thread?

I just installed the new NVIDIA drivers as well, and I have a GTS 450 running CUDALucas and everything is working fine.

Chuck · 2011-10-25, 18:52

Quote:

Originally Posted by ET_

Did you see any differences in timings?

Luigi

I just installed the new driver; I noted a few timings that were on the screen before shutting down both instances of mfaktc.

After installing the new driver I waited for a couple of TFs to complete. I would say there is either no difference or maybe the new driver is taking a littler bit longer.

kladner · 2011-10-25, 19:05

It's working fine for me. I can't judge about speed, because I just started doing work for Mr. P-1 in a range I'm not experienced with.

S45653 · 2011-10-26, 16:49

In driver version 285.62 I noticed a slight improvement in speed compared to 267.59.
avg. rate ~ 116 M/s vs ~ 115 M/s
avg. wait ~ 2100 us vs ~ 2200 us
Version 270.61 showed a lot worse performance - I didn't bother to take readings, just uninstalled it rightaway.

System info:
GPU GTS 450
CPU i3-2100

kjaget · 2011-10-27, 13:28

Quote:

Originally Posted by S45653

In driver version 285.62 I noticed a slight improvement in speed compared to 267.59.
avg. rate ~ 116 M/s vs ~ 115 M/s
avg. wait ~ 2100 us vs ~ 2200 us
Version 270.61 showed a lot worse performance - I didn't bother to take readings, just uninstalled it rightaway.

System info:
GPU GTS 450
CPU i3-2100

Unfortunately none of those are good measures of speed since they can vary depending on minor variations in sieve_primes (caused by a variety of things, including using the computer for normal light tasks while mfaktc is running). Compare time per class or time per exponent instead.
Of course with avg. wait so high maybe your sieve_primes is pinned at 200,000? In that case, this is a real speedup, but as you said, minor.

garo · 2011-10-29, 22:14

I just downloaded and installed 285.62 and the news is not good. At least not for my config. I'm running with SievePrimes fixed so that cannot explain this variation either. I find that the new version is about 4-5% slower. I wonder if compiling with 4.10 might help.

Chuck · 2011-10-29, 23:36

Quote:

Originally Posted by garo

I just downloaded and installed 285.62 and the news is not good. At least not for my config. I'm running with SievePrimes fixed so that cannot explain this variation either. I find that the new version is about 4-5% slower. I wonder if compiling with 4.10 might help.

I thought it seemed just a little slower. Should we go back to the previous version? I use the GPU only for Prime95 so any other changes don't make any difference to me. I was using 280.26 before this update.

garo · 2011-10-30, 09:08

I was using 266.71 and 285.62 is definitely slower by 4-5%.

garo · 2011-10-30, 18:18

I need to amend the above post

I tried setting CPU affinity again and the difference between the driver versions has dropped to less than a percent. The 4-5% difference was not correct.

2011-10-25, 07:56	#1310
delta_t Nov 2002 Anchorage, AK 3×7×17 Posts	New Nvidia GPU driver 285.62 Nvidia released a new driver, 285.62, and looks like it has CUDA 4.10. I just installed it on my computer with a GTX 460M and the current win64 mfaktc (compiled under CUDA 3.2) is working fine. I haven't tried CUDALucas yet, but I figured many CUDALucas people check this thread, so perhaps one of you can test and report in that thread? Last fiddled with by delta_t on 2011-10-25 at 08:12

2011-10-25, 19:05	#1314
kladner "Kieren" Jul 2011 In My Own Galaxy! 10158₁₀ Posts	New Driver It's working fine for me. I can't judge about speed, because I just started doing work for Mr. P-1 in a range I'm not experienced with.

2011-10-29, 22:14	#1317
garo Aug 2002 Termonfeckin, IE 101011001100₂ Posts	I just downloaded and installed 285.62 and the news is not good. At least not for my config. I'm running with SievePrimes fixed so that cannot explain this variation either. I find that the new version is about 4-5% slower. I wonder if compiling with 4.10 might help. Last fiddled with by garo on 2011-10-29 at 22:14

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2011-10-26, 16:49	#1315
S45653 Oct 2008 2³ Posts	In driver version 285.62 I noticed a slight improvement in speed compared to 267.59. avg. rate ~ 116 M/s vs ~ 115 M/s avg. wait ~ 2100 us vs ~ 2200 us Version 270.61 showed a lot worse performance - I didn't bother to take readings, just uninstalled it rightaway. System info: GPU GTS 450 CPU i3-2100

2011-10-30, 09:08	#1319
garo Aug 2002 Termonfeckin, IE 2²×691 Posts	I was using 266.71 and 285.62 is definitely slower by 4-5%.

2011-10-30, 18:18	#1320
garo Aug 2002 Termonfeckin, IE 5314₈ Posts	I need to amend the above post I tried setting CPU affinity again and the difference between the driver versions has dropped to less than a percent. The 4-5% difference was not correct.