mfaktc: a CUDA program for Mersenne prefactoring

[TheJudger]

Hello,

mfaktc 0.19 is now available!

Source code: http://www.mersenneforum.org/mfaktc/mfaktc-0.19.tar.gz
Windows executables (CUDA 4.2): http://www.mersenneforum.org/mfaktc/...win.cuda42.zip
Linux executable (CUDA 4.2): http://www.mersenneforum.org/mfaktc/....cuda42.tar.gz

Highlights:

• faster than mfaktc 0.18, up to 25% for CC >= 2.0, up to 9% for CC 1.x (new kernel, faster squaring code: thank you George!)
• merged user configureable status line from mfakto

As usual: finish your current assignment and upgrade to mfaktc 0.19 after that. The upgrade is recommended to everyone because a speed improvement is possible on all GPUs.

Oliver

[flashjh]

It works really well! (Make sure your cooling is working properly)

Thanks for the update!

[NormanRKN]

very good work Oliver. the improvements are top in 0.19 !

Norman


p.s.
(super gemacht Olli und der leistungszuwachs ist echt super. barrett76 werkelt gerade mit beachtlicher performance ! noch nen bier hol )

[kladner]

My thanks, too.

Now I absolutely have to resolve my driver issues and get up to date so I can run this.

[chalsall]

Originally Posted by TheJudger

The upgrade is recommended to everyone because a speed improvement is possible on all GPUs.

Sweet!!!

On my measly little FX 1800 (CC 1.1), I'm getting about a 8.8% speed increase.

Thanks Oliver and George!!!

[Chuck]

Super, I am running two instances on a GTX 580 and each has increased from 168 M/s to 202 M/s with sieveprimes 2000.

[TObject]

Thank you.

Are the check point files compatible with the previous version?

I have a few long running assignments. And I wonder if I can upgrade right away, or should wait until those are finished.

[kladner]

Oliver, Sir,

This update is beyond amazing. I am attaching a screenshot of 0.18 running 4 instances. I will post again with a screenshot of 0.19 running the same 4 exponents. It is hard to believe that the difference is real.

[kladner]

Part 2. mfaktc x4, same exponents, same system load, CPU @ stock, GPUs @ factory OC. Runs are minutes apart.

EDIT: Times drop from 10s of seconds to 2.5 or less. Wow. Four instances/cores (of a Phenom II x6 1090T) can't come close to saturating a GTX 570. (.....with the default .ini. I'm trying a minimum of 3000 now.)

Another edit: Let me climb down from the walls. I just realized that the default ini has Stages=1. Time to reevaluate!

[ET_]

I have CC 1.3 and CUDA 4.1: should I update to 4.2 to get that 9% increase of speed?

I guess I could figure it myself just trying, but maybe I'm not the one in this situation...

Luigi

[aketilander]

Originally Posted by TObject

Thank you.

Are the check point files compatible with the previous version?

I have a few long running assignments. And I wonder if I can upgrade right away, or should wait until those are finished.

Well I tried and installed the new version over the old. No, the old checkpoint file does not seem to be compatible with the new version of the program, since the TF of the expo began from the beginning. Since I am doing billion digits exponents I would loose like 2 weeks of work keeping the new version. So if you install the new version of the program and want to keep your work it seems as if you need to wait until the old exponents have finished until you upgrade.