On 04.09.2017 15:38, Aaron Watry wrote:
On Sun, Sep 3, 2017 at 3:20 PM, David Niklas <do...@mail.com> wrote:
Hello,
I'm interested in knowing why there are two different OpenCL
implementations of OpenCL drivers for AMD cards.
Is it because they support different ASICs?
One is older and going to be replaced?
As near as I can tell, ROCm requires PCIe 3.0 Atomic operations for
both the CPU and GPU. As such, ROCm will never support the VLIW
radeons (5000-6000 series) or the earlier generations of GCN (SI, CI,
possibly VI?). According to the ROCm page, it requires
Fiji/Polaris/Vega. It also requires either a Haswell or Ryzen CPU (or
newer), so anyone with an older CPU will be left out of ROCm support.
External GPUs via Thunderbolt 1/2 enclosures are also unsupported.
For what it's worth, if you have an "older" system without PCIe 3.0
atomics, you could still try and see how far you get with ROCm. As long
as you don't *actually* need atomics between the CPU and GPU in your own
code, you're probably fine. I've never tried it, though.
Cheers,
Nicolai
There is a bit of overlap between the two projects, in that
Clover/libclc supports Polaris cards on various CPUs, but it's safe to
say that for the moment, if your system is supported by ROCm, it is
the more complete/well-tested option. Clover/Libclc are both still
works in progress that work for some use cases, but they are not
complete, and have never passed a run of the CL 1.2 conformance test
suite in any configuration, and it's definitely a use at your own risk
type of thing for now.
--Aaron
Thanks,
David
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