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> On the other hand the ability to test on GPU-less systems is very useful indeed. Ideally OpenCL's support for CPUs shouldn't just be for testing - it should

> On the other hand the ability to test on GPU-less systems is very useful indeed. Ideally OpenCL's support for CPUs shouldn't just be for testing - it should be able to make efficient use of the CPU's SIMD. Intel still support OpenCL for CPU. [0] AMD used to, but they dropped support for CPU devices, at least on Windows. Perhaps they still support them on Linux. [1][2] [0] https://software.intel.com/content/www/us/en/develop/articles/opencl-drivers.html https://software.intel.com/content/www/us/en/develop/article... [1] https://community.amd.com/thread/231410#comment-2875387 https://community.amd.com/thread/231410#comment-2875387 [2] https://old.reddit.com/r/Amd/comments/aun3y2/amd_cpus_no_longer_have_opencl_support/eha5j2t/ https://old.reddit.com/r/Amd/comments/aun3y2/amd_cpus_no_lon...

klelatti 6y ago
Agree 100% and I was imprecise in my wording. I'm actually using AMD CPU drivers (OpenCL2 on Ubuntu 20.04) in a project that I hope will be in production over the next month or so. Speed is more than acceptable for my purposes. Tried to use Intel but didn't manage to get working. AMD's were a breeze by comparison. I'd be very interested in hearing about others experiences and any benchmark AMD vs Intel comparisons.
- MaxBarraclough 6y ago
  Good to hear AMD haven't completely done away with their OpenCL-on-CPU. Have you compared the performance against alternative technologies like OpenMP? Years ago I had the Intel OpenCL running on an Intel CPU (the machine ran Windows) and AMD OpenCL running on an AMD CPU (that machine also ran Windows). AMD's Visual Studio plugin for OpenCL was really pretty good. Haven't used OpenCL since though so I can't really comment on the current state of things.
  - klelatti 6y ago
    Using some OpenMP but the code is exceptionally well suited to the OpenCL Kernel approach plus the ability to explore use of GPUs at some point in future is helpful. Thanks for the links - I'll have a look at the Intel drivers again and see if I have any more success!

klelatti 6y ago

Agree 100% and I was imprecise in my wording. I'm actually using AMD CPU drivers (OpenCL2 on Ubuntu 20.04) in a project that I hope will be in production over the next month or so. Speed is more than acceptable for my purposes. Tried to use Intel but didn't manage to get working. AMD's were a breeze by comparison. I'd be very interested in hearing about others experiences and any benchmark AMD vs Intel comparisons.

MaxBarraclough 6y ago
Good to hear AMD haven't completely done away with their OpenCL-on-CPU. Have you compared the performance against alternative technologies like OpenMP? Years ago I had the Intel OpenCL running on an Intel CPU (the machine ran Windows) and AMD OpenCL running on an AMD CPU (that machine also ran Windows). AMD's Visual Studio plugin for OpenCL was really pretty good. Haven't used OpenCL since though so I can't really comment on the current state of things.
- klelatti 6y ago
  Using some OpenMP but the code is exceptionally well suited to the OpenCL Kernel approach plus the ability to explore use of GPUs at some point in future is helpful. Thanks for the links - I'll have a look at the Intel drivers again and see if I have any more success!