[llvm-dev] Looking for suggestions: Inferring GPU memory accesses
Ees via llvm-dev
llvm-dev at lists.llvm.org
Sun Aug 23 12:24:13 PDT 2020
Thank you very much for the material. I will have a look and get back to
you (possibly with questions if you don't mind :) ).
I would also appreciate the code if that's available.
On 23-08-2020 18:47, Johannes Doerfert wrote:
> Hi Ees,
> a while back we started a project with similar scope.
> Unfortunately the development slowed down and the plans to revive it
> this summer got tanked by the US travel restrictions.
> Anyway, there is some some existing code that might be useful, though
> in a prototype stage. While I'm obviously biased, I would suggest we
> continue from there.
> @Alex @Holger can we put the latest version on github or some other
> place to share it, I'm unsure if the code I (might have) access to is
> the latest.
> @Ees I attached a recent paper and you might find the following links
> * 2017 LLVM Developers’ Meeting: J. Doerfert “Polyhedral Value &
> Memory Analysis ” https://youtu.be/xSA0XLYJ-G0
> * "Automated Partitioning of Data-Parallel Kernels using Polyhedral
> Compilation.", P2S2 2020 (slides and video
> Let us know what you think :)
> ~ Johannes
> On 8/22/20 9:38 AM, Ees Kee via llvm-dev wrote:
> > Hi all,
> > As part of my research I want to investigate the relation between the
> > grid's geometry and the memory accesses of a kernel in common gpu
> > benchmarks (e.g Rodinia, Polybench etc). As a first step i want to
> > answer the following question:
> > - Given a kernel function with M possible memory accesses. For how
> many of
> > those M accesses we can statically infer its location given concrete
> > for the grid/block and executing thread?
> > (Assume CUDA only for now)
> > My initial idea is to replace all uses of dim-related values, e.g:
> > __cuda_builtin_blockDim_t::__fetch_builtin_x()
> > __cuda_builtin_gridDim_t::__fetch_builtin_x()
> > and index related values, e.g:
> > __cuda_builtin_blockIdx_t::__fetch_builtin_x()
> > __cuda_builtin_threadIdx_t::__fetch_builtin_x()
> > with ConstantInts. Then run constant folding on the result and check
> > many GEPs have constant values.
> > Would something like this work or are there complications I am not
> > of? I'd appreciate any suggestions.
> > P.S i am new to LLVM
> > Thanks in advance,
> > Ees
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