[Openmp-dev] FW: [Non-DoD Source] Re: [llvm-dev] llvm OpenMP support for Apple Silicon

[Ye Luo via Openmp-dev]

Vulkan can be an alternative.
https://www.phoronix.com/scan.php?page=news_item&px=Vulkan-SDK-For-Apple
Ye
===================
Ye Luo, Ph.D.
Computational Science Division & Leadership Computing Facility
Argonne National Laboratory


On Tue, Oct 19, 2021 at 4:08 PM GRISMER, MATTHEW J CIV USAF AFMC AFRL/RQVC
via Openmp-dev <openmp-dev at lists.llvm.org> wrote:

> *From: *GRISMER, MATTHEW J CIV USAF AFMC AFRL/RQVC <
> matthew.grismer at us.af.mil>
> *Date: *Tuesday, October 19, 2021 at 4:24 PM
> *To: *Johannes Doerfert <johannesdoerfert at gmail.com>,
> llvm-dev at lists.llvm.org <llvm-dev at lists.llvm.org>
> *Cc: *openmp-dev <openmp-dev at lists.llvm.org>
> *Subject: *Re: [Non-DoD Source] Re: [llvm-dev] llvm OpenMP support for
> Apple Silicon
>
> Johannes,
>
>
>
> According to the Apple documentation, you access the GPU via their Metal
> API.  Metal supports computation as well as graphics acceleration.  Digging
> a little deeper, kernels that run on the GPU are written in Metal Shading
> Language, which is a variant of C++ designed for GPUs.  The preparatory
> stuff to get the kernel running on the GPU is all done through a Metal
> Objective-C/C++ object which is tied to the particular device you want to
> use.  With that object you get a reference to your kernel function(s),
> setup a pipeline (converts function to executable code), create a queue,
> create data buffers and load data, create a command buffer and encode
> commands, specify thread count and group size, and commit the queue to
> execute it.  Somewhat similar to how SYCL works, at least from what I’ve
> read.  Since Apple uses LLVM/Clang for their system compiler, I assume it
> is also used to compile for the GPU.  Anyway, the short answer to the
> question appears to be OpenMP offload would need to be implemented using
> Apple’s Metal API.
>
>
>
> Matt
>
>
>
> *From: *Johannes Doerfert <johannesdoerfert at gmail.com>
> *Date: *Saturday, October 16, 2021 at 12:30 PM
> *To: *GRISMER, MATTHEW J CIV USAF AFMC AFRL/RQVC <
> matthew.grismer at us.af.mil>, llvm-dev at lists.llvm.org <
> llvm-dev at lists.llvm.org>
> *Cc: *openmp-dev <openmp-dev at lists.llvm.org>
> *Subject: *[Non-DoD Source] Re: [llvm-dev] llvm OpenMP support for Apple
> Silicon
>
> Hi Matt,
>
> not that I'm aware of any ongoing effort.
>
> Though, I'm not an expert on Apple hardware (or software for that matter).
> How would you program them right now?
> Does LLVM have code generation capabilities for those GPUs?
>
> Depending on the answers it might be reasonable to add OpenMP offloading
> support (or not).
>
> ~ Johannes
>
>
> On 10/15/21 12:42, GRISMER, MATTHEW J CIV USAF AFMC AFRL/RQVC via
> llvm-dev wrote:
> > Hi,
> >
> > I'm interested in exploring Apple Silicon performance with computational
> fluid dynamic codes, in particular codes that take advantage of OpenMP
> offload to accelerate performance.  Are there any plans to support OpenMP
> offload to the integrated GPU in Apple Silicon processors?
> >
> > Thanks.
> >
> > Matt
> >
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> _______________________________________________
> Openmp-dev mailing list
> Openmp-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/openmp-dev/attachments/20211019/f4e8b266/attachment-0001.html>