mfakto: an OpenCL program for Mersenne prefactoring

[AK76]

Originally Posted by AK76

Soon i will test 100M candidates on different bits, to comapre my GPU performance with Bdot's 7950.

My Gigabyte R9 290 results:

TF 100M exponent 65-66 - 2550 M/s - 430 GHz-days/day
TF 100M exponent 66-67 - 2680 M/s - 440 GHz-days/day
TF 100M exponent 67-68 - 2850 M/s - 480 GHz-days/day
TF 100M exponent 68-69 - 2880 M/s - 484 GHz-days/day
TF 100M exponent 69-70 - 2690 M/s - 450 GHz-days/day
TF 100M exponent 70-71 - 2420 M/s - 405 GHz-days/day
TF 100M exponent 71-72 - 2400 M/s - 400 GHz-days/day
TF 100M exponent 72-74 - 2450 M/s - 410 GHz-days/day

GPUSieveSize=4
GPUSieveProcessSize=8
GPUSievePrimes=30000

[Bdot]

Originally Posted by AK76

My Gigabyte R9 290 results:

TF 100M exponent 65-66 - 2550 M/s - 430 GHz-days/day
TF 100M exponent 66-67 - 2680 M/s - 440 GHz-days/day
TF 100M exponent 67-68 - 2850 M/s - 480 GHz-days/day
TF 100M exponent 68-69 - 2880 M/s - 484 GHz-days/day
TF 100M exponent 69-70 - 2690 M/s - 450 GHz-days/day
TF 100M exponent 70-71 - 2420 M/s - 405 GHz-days/day
TF 100M exponent 71-72 - 2400 M/s - 400 GHz-days/day
TF 100M exponent 72-74 - 2450 M/s - 410 GHz-days/day

GPUSieveSize=4
GPUSieveProcessSize=8
GPUSievePrimes=30000

Are these the settings that you use for best screen responsiveness? I'd also be interested to see what you get for high-performance settings, e.g.
GPUSieveSize=126
GPUSieveProcessSize=24
GPUSievePrimes=67000
FlushInterval=0

And I think it's a typo that you got the same 410 GHz for 72-73 and 73-74 ... Or did you download the mfakto sources from github and compiled it for yourself?

Anyway, I don't have sufficient time right now to trace down the remaining performance issue. So I will post another test version soon so that a few more people can do these tests and tell me if it got better or worse for them ... I have the feeling that I reached some limit for the optimizer because I added so much code. Maybe it is not trying as hard as before ...

[AK76]

Originally Posted by Bdot

Are these the settings that you use for best screen responsiveness? I'd also be interested to see what you get for high-performance settings, e.g.
GPUSieveSize=126
GPUSieveProcessSize=24
GPUSievePrimes=67000
FlushInterval=0

I have the biggest GHz-d/day on this settings but i will try your numbers in few days.

And I think it's a typo that you got the same 410 GHz for 72-73 and 73-74 ... Or did you download the mfakto sources from github and compiled it for yourself?

It's my error, of course it should be 72-73. I don't know how to compile mfakto from sources.

[Mark Rose]

Has anyone got the iGPU stuff working on Linux? I haven't tried yet, but I have access to a few Haswells and Ivy Bridges...

[Prime95]

Originally Posted by Mark Rose

Has anyone got the iGPU stuff working on Linux? I haven't tried yet, but I have access to a few Haswells and Ivy Bridges...

Last I read Intel had no plans to support OpenCL on Linux for their integrated GPUs.

[Mark Rose]

Originally Posted by Prime95

Last I read Intel had no plans to support OpenCL on Linux for their integrated GPUs.

Intel released the first support in January 2013. Apparently the guy who first created it left the company, but the work was continued by Intel China.

[Prime95]

Originally Posted by Mark Rose

Intel released the first support in January 2013. Apparently the guy who first created it left the company, but the work was continued by Intel China.

I looked again at Intel's web site - still no love for Linux that I could see: https://software.intel.com/en-us/int...etails#devices

Can you point us to a place to get Linux drivers for OpenCL support with the integrated GPU?

[potonono]

Originally Posted by Prime95

I looked again at Intel's web site - still no love for Linux that I could see: https://software.intel.com/en-us/int...etails#devices

Can you point us to a place to get Linux drivers for OpenCL support with the integrated GPU?

Maybe https://software.intel.com/en-us/art...opencl-drivers here?

[AK76]

Originally Posted by AK76

I have the biggest GHz-d/day on this settings but i will try your numbers in few days.
It's my error, of course it should be 72-73. I don't know how to compile mfakto from sources.

I compared both settings, my and suggested. On my 290 better are my.

[Prime95]

Originally Posted by potonono

Maybe https://software.intel.com/en-us/art...opencl-drivers here?

I don't see any Linux drivers there for HD graphics.

[Bdot]

Originally Posted by AK76

I compared both settings, my and suggested. On my 290 better are my.

OK, that is really interesting because it means that the GCN chips in the R290 are really different from its predecessors. Or in other words, I would need one in order to optimize for it.

Or ... OK. I will post another pre-release version on the weekend that has an enhanced --perftest mode that exactly measures each kernel. Together with a script and a set of ini files (and maybe some alternative kernels files) I should be able to provide an automatic test, if you'd be willing to run such a thing ...