mfakto: an OpenCL program for Mersenne prefactoring

[flashjh]

Originally Posted by KyleAskine

I will try to harvest some from GPU to 72 tonight when I get home.

Me too

[chalsall]

Originally Posted by KyleAskine

I will try to harvest some from GPU to 72 tonight when I get home.

I've asked Spidy to look for some available candidates in the 59M range. So far it's only found 15.

If it can't get a couple of hundred or so, I'll ask it to grab a few up the 60M or so range. Past where it's currently useful for the LL wavefront, but worthwhile for future work.

I'll have the system return them to the pool after being TFed to 70 or beyond.

Edit: Spidy also often finds at least a few dozen only TFed to 69 in the current working ranges at around 0000 UTC if you want to check then.

Edit2: And, of course, you could always do some work in the DC range where there's a large number available only TFed to 68.

[KyleAskine]

I have mfakto on a 6570, which is far from a high end card. When I go from 69 to 70 on it, it can do around 50 or 55 M/s. When I go from 70 to 71 it can only do around 25 M/s. Could I be hitting the onboard memory limit, so it has to use slow memory? Could it be something else? I haven't experienced this with any other card.

Edit - Nope, I just grabbed a 69 to 70, and that has the same issue. Something else has happened here...

Edit 2 - Alright, the core speed seems to have been halved... and I cannot change it... time for a reboot.

[Dubslow]

Originally Posted by chalsall

Edit: Spidy also often finds at least a few dozen only TFed to 69 in the current working ranges at around 0000 UTC if you want to check then.

I've found that more often than not the standard daily dump finds 100+ at 69 <60M. Just give it a day or two, and as long as flash and Kyle are paying attention, they ought to be able to get them real easy like. (I think that's the first time I've ever used that particular construction.) I check like once or twice a day, and there's usually at least 50 available at 69.

[Bdot]

Originally Posted by KyleAskine

I have mfakto on a 6570, which is far from a high end card. When I go from 69 to 70 on it, it can do around 50 or 55 M/s. When I go from 70 to 71 it can only do around 25 M/s. Could I be hitting the onboard memory limit, so it has to use slow memory? Could it be something else? I haven't experienced this with any other card.

Memory usage should be the same (and very low). I'd guess that some other parameters are chosen differently, like threads per grid, NumStreams, VectorSize, SievePrimes or the kernel being used. Threads per grid and NumStreams are the only parameters to influence GPU memory consumption.

Are CPU and GPU load about the same? Do you set the affinity of mfakto (differently)? I'll include in the test package a binary that can tell you the raw kernel speed. That can help isolate the issue.

[KyleAskine]

Originally Posted by Bdot

Memory usage should be the same (and very low). I'd guess that some other parameters are chosen differently, like threads per grid, NumStreams, VectorSize, SievePrimes or the kernel being used. Threads per grid and NumStreams are the only parameters to influence GPU memory consumption.

Are CPU and GPU load about the same? Do you set the affinity of mfakto (differently)? I'll include in the test package a binary that can tell you the raw kernel speed. That can help isolate the issue.

Something wonky happened with the drivers (or something), but a reboot got me back to normal.

[RMAC9.5]

Bdot,

I recently added an ATI6970 video card to this PC and need some help in setting up Mfakto-0.10p1. My O/S is Windows Server 2003 SP1. My video driver is 11-12_xp64_dd_ccc_ocl. The CCC setup exe or msi appeared to install correctly even though I don't see the red CCC icon at bottom right side of my screen. My initial error message when I ran Mfakto-64.exe was a MSVCR100.dll not found message. After getting this error I ran the OpenCL.msi file in the OpenCL64 folder and the CCC_utility64.msi file in the Utility64 folder. They appeared to install correctly, but this did not solve my problem. Search finds 3 copies of the MSVCR100.dll on this PC with today's date. Suggestions on what to do next are appreciated.

Thanks,
Roger

[flashjh]

Originally Posted by RMAC9.5

Bdot,

I recently added an ATI6970 video card to this PC and need some help in setting up Mfakto-0.10p1. My O/S is Windows Server 2003 SP1. My video driver is 11-12_xp64_dd_ccc_ocl. The CCC setup exe or msi appeared to install correctly even though I don't see the red CCC icon at bottom right side of my screen. My initial error message when I ran Mfakto-64.exe was a MSVCR100.dll not found message. After getting this error I ran the OpenCL.msi file in the OpenCL64 folder and the CCC_utility64.msi file in the Utility64 folder. They appeared to install correctly, but this did not solve my problem. Search finds 3 copies of the MSVCR100.dll on this PC with today's date. Suggestions on what to do next are appreciated.

Thanks,
Roger

Did you use the GPU computing guide? I found I needed the AMD App SDK. I never saw that error though... bdot may have more suggestions.

EDIT: I did some searching for your specific error and found this:

I managed to fix this missing MSVCR100.dll error by installing the 2010 C++ Visual Studio redistributable at:
http://www.microsoft.com/downloads/e...F-9350143D5867

[Bdot]

Originally Posted by RMAC9.5

Bdot,

I recently added an ATI6970 video card to this PC and need some help in setting up Mfakto-0.10p1. My O/S is Windows Server 2003 SP1. My video driver is 11-12_xp64_dd_ccc_ocl. The CCC setup exe or msi appeared to install correctly even though I don't see the red CCC icon at bottom right side of my screen. My initial error message when I ran Mfakto-64.exe was a MSVCR100.dll not found message. After getting this error I ran the OpenCL.msi file in the OpenCL64 folder and the CCC_utility64.msi file in the Utility64 folder. They appeared to install correctly, but this did not solve my problem. Search finds 3 copies of the MSVCR100.dll on this PC with today's date. Suggestions on what to do next are appreciated.

Thanks,
Roger

Hi Roger,

as flashjh already pointed out, this is the MS VisualC Runtime, version 10.0 that needs to be installed via the redistributable. If you already have that dll a few times, then mfakto was just not able to find it (the dll's directory needs to be in the PATH variable), or it has the wrong version. You can try creating another copy of that dll in mfakto's directory, if you want to avoid downloading and installing the redistributable.

Bdot

[Bdot]

Originally Posted by flashjh

Did you use the GPU computing guide? I found I needed the AMD App SDK. I never saw that error though... bdot may have more suggestions.

BTW, when using the latest (11.12) AMD drivers, the APP SDK is no longer required. I'm not sure since when that is so - AMD documented it for 11.7/Windows and 11.9/Linux, but I found on 11.9/Windows it was still needed.

[flashjh]

Originally Posted by Bdot

BTW, when using the latest (11.12) AMD drivers, the APP SDK is no longer required. I'm not sure since when that is so - AMD documented it for 11.7/Windows and 11.9/Linux, but I found on 11.9/Windows it was still needed.

Yes, you're right... My newest install only has 11.12 and everything works great. Thanks.