Hello again,

i have 2 different computers, one using AMD GPU ant the other using nVidia

Both of them are running open source drivers, via mesa. And i have installed mesa-opencl-icd package, so that BOINC detects GPU as opencl capable

But, *every* task i start ends with "computing error"!

What am i doing wrong?

BOINC version is 7.6.33, Ubuntu 16.04 and mesa 17.0.7

Thanks in advance!

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with *every task* i mean, *every task meant to be computed via OpenCL*, not regular CPU tasks

oh, and also, my GPUs are:

AMD: A6-5200 Quad-core with HD 8400

nVidia: GeForce GT 630

And your tasks are coming from - which project?

several,

seti@home, asteroids@home, Einstein@home.....

From that list, probably the best Linux GPU support community is at Einstein. Try BRP6-OPENCL-ATI WITH LINUX MESA OPENCL

just posted.... Will update with news, if any....

thank you

I've seen you already got some help in the EaH forums. The problem is that the Mesa driver seems to either not support OpenCL fully or has a bug that is triggered by the science apps. From the logs I've seen the process exits with signal 6 (SIGABRT) abort. From the backtrace another user posted it seems the driver fails when the function "clGetPlatformIDs()" is called.

well, i see OpenCL support is 1.1.... maybe its not enough...

And, it seems OpenCL support in Mesa is not fully implemented... maybe thats another point.... https://dri.freedesktop.org/wiki/GalliumCompute/

There is a lot TODO in this list. The BRP4 opencl app is available (https://einsteinathome.org/de/application-source-code-and-license)and can be used for testing if needed. I can provide testdata in case you want to escalate this to the mesa developers. EaH uses the original ATI/Nvidia drivers as a reference and there are no problems there.

as "original ATI driver", you mean propietary ones?

The point is that, propietary ATI drivers:

1) offers much worse performance under Ubuntu, and
2) they are not available anymore for the X version provided in newest Ubuntu versions

what do you think about using bleed-edge Mesa from here?

https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers

May that help?

Yes, I mean the proprietary ones. Yes, we are aware of the shortcommings of those on Linux. But they were there first and are now the reference. As I understand it the mesa driver is not yet feature complete and is not guaranteed to work with all applications. I don't know exactly what is wrong but using bleeding edge wan't make it worse I guess. This is not something the app developer can fix this is something the driver developer has to do.

I can provide testdata in case you want to escalate this to the mesa developers. EaH uses the original ATI/Nvidia drivers as a reference and there are no problems there.

I´d love to! i don´t know exasctly how can i help, but i´ll do my best. And yes, there are no problems with propietary drivers.