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-   -   mfaktc: a CUDA program for Mersenne prefactoring (https://www.mersenneforum.org/showthread.php?t=12827)

TheJudger 2011-03-13 14:08

1 Attachment(s)
64bit Windows executable!
I've used the same system for building as before: [url]http://www.mersenneforum.org/showpost.php?p=253351&postcount=586[/url]

Maximum files size limit here doesn't allow me to include the cudart*.dll. :sad:

Oliver

TheJudger 2011-03-13 14:10

1 Attachment(s)
Last but not least the 32bit Windows executable

firejuggler 2011-03-13 14:29

thanks for the binaries. I will be able to test them tonight

drh 2011-03-13 15:16

This is my first attempt at trying mfaktc as I finally just got a laptop with a NVS 3100M to get familiar with the program. I'm running driver 257.38, and I get this error message ...

cudaGetLastError() returned 35: CUDA driver version is insufficient for CUDA runtime version

Do I need to upgrade my 257.38 driver?

Thanks,
Doug

James Heinrich 2011-03-13 15:58

1 Attachment(s)
[QUOTE=TheJudger;255059]Maximum files size limit here doesn't allow me to include the cudart*.dll. :sad:[/QUOTE]Sure it does... it compresses well (only 106kB for 7z) :smile:

James Heinrich 2011-03-13 16:03

[QUOTE=TheJudger;255058]checkpoint files are ignored from foreign versions of mfaktc[/QUOTE]Including pre-release variants of the same version, I have discovered, for those that care. :sad:

Which, for me, means it'll be another 6d14h before I can upgrade to 0.16-final, once I finish the current bitlevel of my current assignment. :razz:

ET_ 2011-03-13 16:33

[QUOTE=James Heinrich;255069]Including pre-release variants of the same version, I have discovered, for those that care. :sad:

Which, for me, means it'll be another 6d14h before I can upgrade to 0.16-final, once I finish the current bitlevel of my current assignment. :razz:[/QUOTE]

I'm still working with v.0.14... :smile: I'll start with v0.16 as soon as my range at 78 bits ends.

Luigi

TheJudger 2011-03-13 17:57

Hi Doug,

[QUOTE=drh;255064]This is my first attempt at trying mfaktc as I finally just got a laptop with a NVS 3100M to get familiar with the program. I'm running driver 257.38, and I get this error message ...

cudaGetLastError() returned 35: CUDA driver version is insufficient for CUDA runtime version

Do I need to upgrade my 257.38 driver?
[/QUOTE]
Did you receive this error message right after the famous "cudaStreamCreate() failed for stream 0"?

You're right, this indicates that your driver doesn't fit with the CUDA runtime dll. If possible try to update the driver to some 260+ version.


[QUOTE=James Heinrich;255068]Sure it does... it compresses well (only 106kB for 7z) :smile:[/QUOTE]
Thank you, James! Actually I didn't try to compress. :blush:

Oliver

drh 2011-03-13 18:11

[QUOTE=TheJudger;255077]Hi Doug,


Did you receive this error message right after the famous "cudaStreamCreate() failed for stream 0"?

You're right, this indicates that your driver doesn't fit with the CUDA runtime dll. If possible try to update the driver to some 260+ version.[/QUOTE]


I get it right after I try to run mfaktc -st ... mfaktc -tt runs fine, as far as I can tell. I get cudaSetDevice(0) failed. I also get it if I try to run the program with a -tf ...

Thanks,
Doug

firejuggler 2011-03-13 18:40

under ubuntu 10.10, with a e8300, gtx460,
for assignment: exp=3321928109 bit_min=75 bit_max=76

0.15
307.36M candidates in 2491ms (123.39M/s) (avg. wait: 250us)

0.16
308.28M | 2.388s | 129.10M/s | 5000 | 34m59s | 34us

so a 5% improvement

under windows i didn't find a significant improvement.

TheJudger 2011-03-13 18:50

firejuggler, you're limited by the speed of your CPU (average wait is very small), thats why you don't see ~18%. But your GPU should consume less power that way.
The CPU bottleneck is a common problem for mfaktc on fast GPUs. :sad: Only solution today: start another instance of mfaktc.

Oliver


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