On Thursday, 18 May 2017 at 05:39:52 UTC, Manu wrote:
I just caught up on the dconf material. It was a really
interesting year, and I'm super bummed I missed it!
So I'm just starting out on some GPGPU work, and I love the
direction we're going here.
Given this scenario;
I want to write CUDA kernels in D, and execute them in an
existing C++ CUDA
app.
Can do already although not all the intrinsics are there yet, but
they are very simple to add. See
https://github.com/libmir/dcompute/blob/master/source/dcompute/std/cuda/index.d for how easy it is (PRs welcome!)
Can anyone point me at the getting started material, how do I
achieve this
seemingly simple goal?
If you're only interested in CUDA I think any LLVM 3.9.1 or 4.0
should work, If you want SPIRV get my LLVM from
https://github.com/thewilsonator/llvm/tree/compute
Get the dcompute branch of LDC (
https://github.com/ldc-developers/ldc/tree/dcompute) and its
submodules (i.e. druntime, I don't think it points to a branch
anymore because Johan deleted that when I merged that into the
regular ldc druntime but it will still work.) The dcompute branch
of LDC is in the process of being merged into master so expect
some breakage when updating to that.
Has anyone started on this content? Where are the toolchains,
how to I
build a CUDA kernel, how do I link/load it in my C++ app?
There is some info on the dcompute wiki
(https://github.com/libmir/dcompute/wiki) and I intend make this
into "production quality" documentation (again PRs welcome or I
can give you write access to the wiki), but I'm very busy at the
moment.
When ldc runs you will get a kernels_cudaxxx_yy.ptx (where xxx is
the CUDA compute capability specified on the command line and yy
is 32 or 64 for 32 or 64bit) which should fit somewhere into your
existing C++ pipeline.
If this doesn't exist, there needs to be a wiki with getting
started guide covering various usage environments. I don't have
a lot of time to spare on detail, so success will depend on my
ability to hit the ground running, and that's really just a
matter of simple clear reference material.
How far are we from integration into LDC without using forked
compilers?
Soon™, it the first thing I'm going to do (if I don't get it done
before) after I hand in my honours thesis at the start of July.
I'm stupidly busy this semester so don't count on it done
beforehand.
If you have any questions about anything probably the fastest way
is the libmir or ldc gitter channels.
(https://gitter.im/ldc-developers/main ,
https://gitter.im/libmir/public).
Good luck! I look forward to your experience report.
Nic
