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Old 2022-07-24, 18:47   #1
storm5510
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I have an RTX 2080. What is a proper number of threads to specify?

My GPU utilization never goes beyond 2%.


Ed's Note: This and the following posts have been copied/moved from the Msieve benchmark thread since they more directly involve getting a GPU running, rather than adjusting and providing benchmark values.

Last fiddled with by EdH on 2022-08-11 at 12:43
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Old 2022-07-24, 19:57   #2
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No threads. After compiling the msieve-lacuda-nfsathome branch with the option CUDA=75, run with
-nc2 -g 0 -v
where the number after -g specifies which gpu to use. Without the -g option, it uses only the cpu.
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Old 2022-07-24, 22:22   #3
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Quote:
Originally Posted by frmky View Post
No threads. After compiling the msieve-lacuda-nfsathome branch with the option CUDA=75, run with
-nc2 -g 0 -v
where the number after -g specifies which gpu to use. Without the -g option, it uses only the cpu.
OK. Well, what i have is not Linux. It's Windows 10. Thanks for the reply!
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Old 2022-07-27, 01:43   #4
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Quote:
Originally Posted by storm5510 View Post
OK. Well, what i have is not Linux. It's Windows 10. Thanks for the reply!
If you're willing to do a little work, Windows Subsystem for Linux 2 works with CUDA now, so you can build and run it there.
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Old 2022-07-27, 23:26   #5
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Quote:
Originally Posted by wombatman View Post
If you're willing to do a little work, Windows Subsystem for Linux 2 works with CUDA now, so you can build and run it there.
I found one Windows version which will run, to a point. It says it cannot find "sort_engine.dll" in a folder called "cub." It is right there in the proper place where the program looks for it.

I have the subsystem installed. It is Ubuntu 20.04 LTS. It's been a while since I've used it.
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Old 2022-07-28, 01:22   #6
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Quote:
Originally Posted by storm5510 View Post
I found one Windows version which will run, to a point. It says it cannot find "sort_engine.dll" in a folder called "cub." It is right there in the proper place where the program looks for it.
That's an old version that doesn't contain my work on the GPU LA. I'm not aware of anyone that's compiled a Windows version with my changes.

There's a guide to using CUDA with WSL2 at https://docs.nvidia.com/cuda/wsl-user-guide/index.html.

Last fiddled with by frmky on 2022-07-28 at 01:27
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Old 2022-07-28, 16:56   #7
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Quote:
Originally Posted by frmky View Post
That's an old version that doesn't contain my work on the GPU LA. I'm not aware of anyone that's compiled a Windows version with my changes.

There's a guide to using CUDA with WSL2 at https://docs.nvidia.com/cuda/wsl-user-guide/index.html.
What I have on this machine is WSL1. A better option, for me, is to install Ubuntu on an idle machine. I have v21.10 burned on a DVD-R. This would, at least, give me the GUI. I know enough console commands to get by. The system I am considering has a GTX 1080 in it. I have notes I made relative to that particular system, including CUDA driver installation. I'm not familiar with "bash" files so I would have to do a bit of reading.

Point me to a version I can try and I will give it a go.
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Old 2022-07-29, 00:48   #8
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Disregard the above. I found several versions on James Heinrich's mirror page which will run. The one I am running now is "1018-vbits256-sandybridge."
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Old 2022-07-29, 02:00   #9
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Quote:
Originally Posted by storm5510 View Post
Disregard the above. I found several versions on James Heinrich's mirror page which will run. The one I am running now is "1018-vbits256-sandybridge."
None of the versions on mersenne.ca have the GPU linear algebra code.
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Old 2022-07-29, 03:49   #10
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Once you have installed the compiler and CUDA toolkit...
https://docs.nvidia.com/cuda/cuda-in...u-installation

Code:
sudo apt install git libgmp-dev
git clone https://github.com/gchilders/msieve_nfsathome.git -b msieve-lacuda-nfsathome
cd msieve_nfsathome
make all CUDA=75 VBITS=256
If you don't want to run from that directory, then copy msieve, *.ptx, and cub/*.so to the directory you are running in.
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Old 2022-07-29, 14:41   #11
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Quote:
Originally Posted by charybdis View Post
None of the versions on mersenne.ca have the GPU linear algebra code.
Then where can they be found?

Last fiddled with by storm5510 on 2022-07-29 at 15:23
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