gpuOwL: an OpenCL program for Mersenne primality testing

Originally Posted by preda

Warning for ROCm users: refrain from upgrading to recently-released ROCm 2.3, there is a 5% perf degradation. https://github.com/RadeonOpenCompute/ROCm/issues/766

I regret it is too late :-)


how did you notice the regression ?

[preda]

Originally Posted by SELROC

I regret it is too late :-)


how did you notice the regression ?

From the timing information displayed, which jumped up right after upgrade. I downgraded, and the timing recovered.

Originally Posted by preda

From the timing information displayed, which jumped up right after upgrade. I downgraded, and the timing recovered.

which kernel are you using ?


I have downgraded ROCm but the timing is the same, I am using kernel 5.0.0

[preda]

Originally Posted by SELROC

which kernel are you using ?


I have downgraded ROCm but the timing is the same, I am using kernel 5.0.0

I'm using kernel 5.0.7, but it shouldn't have much impact on performance.

I could downgrade to ROCm 2.2 by using this in /etc/apt/sources.list.d:
deb [arch=amd64] http://repo.radeon.com/rocm/apt/2.2/ xenial main

Originally Posted by preda

I'm using kernel 5.0.7, but it shouldn't have much impact on performance.

I could downgrade to ROCm 2.2 by using this in /etc/apt/sources.list.d:
deb [arch=amd64] http://repo.radeon.com/rocm/apt/2.2/ xenial main

where did you find the 5.0.7 ?

[M344587487]

Originally Posted by SELROC

where did you find the 5.0.7 ?

On Ubuntu the easiest way is to use ukuu or install from .deb files here: https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.7/


Going the .deb route you need to download all the amd64 .deb files that don't say low latency, then do dpkg -i *.deb and restart the PC. You'd need to apply any custom kernel parameters again if you use any, the new kernel should be the default but assuming you're using grub you can select an older kernel on boot if desired as they're still installed unless you uninstall them.


edit: I recommend ukuu but you do need to add a ppa to install it which can be found with a search.

Originally Posted by M344587487

On Ubuntu the easiest way is to use ukuu or install from .deb files here: https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.7/


Going the .deb route you need to download all the amd64 .deb files that don't say low latency, then do dpkg -i *.deb and restart the PC. You'd need to apply any custom kernel parameters again if you use any, the new kernel should be the default but assuming you're using grub you can select an older kernel on boot if desired as they're still installed unless you uninstall them.


edit: I recommend ukuu but you do need to add a ppa to install it which can be found with a search.

That wasn't necessary, I know how to install .deb packages.


Ukuu has become a For-Pay product, and it is a graphical tool, not useful for me.


https://github.com/teejee2008/ukuu

[M344587487]

Originally Posted by SELROC

That wasn't necessary, I know how to install .deb packages.

I try to assume nothing to be as clear as possible. Taken a step further should I have assumed you knew not to use the low latency debs?

Originally Posted by SELROC

Ukuu has become a For-Pay product, and it is a graphical tool, not useful for me.


https://github.com/teejee2008/ukuu

There is an element that is a paid product but the core functionality is free. It has a commandline element, never seen the GUI.

Originally Posted by M344587487

I try to assume nothing to be as clear as possible. Taken a step further should I have assumed you knew not to use the low latency debs?

There is an element that is a paid product but the core functionality is free. It has a commandline element, never seen the GUI.

Nice to know, thanks for the info.

Originally Posted by SELROC

I must note that the error (zero residue) has appeared for the first time to me with the radeon VII.

Another 6 days passed and only got an EE on the first day (not the same error as the residue was not 0000...), after that no error until now.

Originally Posted by SELROC

Another 6 days passed and only got an EE on the first day (not the same error as the residue was not 0000...), after that no error until now.

Well, I meant no error yet. Life is fantastic with a Radeon VII.