The P-1 factoring CUDA program

[flashjh]

GTX 580, emailed also.

[Mark Rose]

Originally Posted by LaurV

Yes indeed, you explained it better. I was referring to the fact that if some user wants to extend some B1 (for an expo assigned by primenet or gpu72, for which he didn't do any work before, like there are many on mersenne.ca with insufficient P-1 done), he currently need to do everything from scratch. That is because storing checkpoint files on the server is costly (not as much to store - now there are cheap big HDDs - as to download, the trafic will be overkill).

It doesn't seem that expensive to me. I'm P-1ing M63970349, using 3456K, which result in a save file of about 13.5 MB. My internet connection at home could download or upload that in 2.16 seconds (unlimited 50/50 Mbps symmetrical can be had for $115/month, or 175/175 for $211). Alternatively, I could rent a server with 20 TB/month traffic for $100/month, which would provide for the uploading or downloading of over 1 million save files.

[James Heinrich]

Originally Posted by Mark Rose

My internet connection at home could download or upload that in 2.16 seconds (unlimited 50/50 Mbps symmetrical can be had for $115/month, or 175/175 for $211)

You are most fortunate. Many of us would consider 1Mbps upstream "very good".

[Mark Rose]

Originally Posted by James Heinrich

You are most fortunate. Many of us would consider 1Mbps upstream "very good".

I suppose fast internet is one benefit of living in Hogtown. Personally, I'd rather be out in the country! Though I'd probably start scheming to trench fiber...

I do remember the days of having to use a 2400 bits per second connection a mere 14 years ago. My parents took the computer away, but I assembled another out of antique free parts. Downloading JPEGs was a luxury.

[LaurV]

Originally Posted by James Heinrich

Better, yes, but if you (and anyone else who cares to share) could email me the whole file that'd be great, I can try and establish some expected-performance numbers once I have a decent sample size.

here you are for 580

[Mini-Geek]

FWIW, here's another GTX 560, CUDAPm1 v0.20.

[LaurV]

Trouble with cudapm1. I have a couple of 69M exponents reserved from gpu72, for which stage 1 was done, but stage 2 crashes without any error. Two of my cards wasted the last 20 hours or so, retrying stage 2 (the batch loop, remember?).

When I saw the thing (in fact, I saw less lines in the result file than expected), I stopped the batch and tried with different parameters for -e2, -d2, and even "UnusedMem=" in the ini file, with or without "M" at the end, the result is the same: some memory-related crash (i assume, because the test works for cards with 3G, and fails in all cards with 1536M of memory).

I did not report the "stage 1" yet, and still keep the s1 checkpoint files, if someone else is going to try (8MB checkpoint file size, for a 4096k FFT)

[ET_]

Originally Posted by LaurV

Trouble with cudapm1. I have a couple of 69M exponents reserved from gpu72, for which stage 1 was done, but stage 2 crashes without any error. Two of my cards wasted the last 20 hours or so, retrying stage 2 (the batch loop, remember?).

When I saw the thing (in fact, I saw less lines in the result file than expected), I stopped the batch and tried with different parameters for -e2, -d2, and even "UnusedMem=" in the ini file, with or without "M" at the end, the result is the same: some memory-related crash (i assume, because the test works for cards with 3G, and fails in all cards with 1536M of memory).

I did not report the "stage 1" yet, and still keep the s1 checkpoint files, if someone else is going to try (8MB checkpoint file size, for a 4096k FFT)

Two weeks on vacation, and I've lost you guys

Is there some documetation on how to use benchmark files on CudaP-1 ?

Luigi

[firejuggler]

Quoting post 404,

Originally Posted by James Heinrich

The benchmark invoked by the linked code snippet generates a benchmark file, and owftheevil was even kind enough to suggest in the screen output that people email it to me.

./CUDAPm1 -cufftbench 1 8192 1

[ET_]

Originally Posted by firejuggler

Quoting post 404,

Thanks

Luigi

[owftheevil]

Originally Posted by LaurV

Trouble with cudapm1. I have a couple of 69M exponents reserved from gpu72, for which stage 1 was done, but stage 2 crashes without any error. Two of my cards wasted the last 20 hours or so, retrying stage 2 (the batch loop, remember?).

When I saw the thing (in fact, I saw less lines in the result file than expected), I stopped the batch and tried with different parameters for -e2, -d2, and even "UnusedMem=" in the ini file, with or without "M" at the end, the result is the same: some memory-related crash (i assume, because the test works for cards with 3G, and fails in all cards with 1536M of memory).

I did not report the "stage 1" yet, and still keep the s1 checkpoint files, if someone else is going to try (8MB checkpoint file size, for a 4096k FFT)

How far past stage1 gcd does it get? What is the reported available memory and estimate of memory it will use (beginning of stage 1)? Are you doing stage 1 and stage 2 on different cards?