[Openmp-dev] OpenMP offloading to the sm_35 device from x86 compute nodes
Itaru Kitayama via Openmp-dev
openmp-dev at lists.llvm.org
Sun Mar 17 17:36:25 PDT 2019
Jonas, all,
Although Alexey warned me to use the recent Clan 7 or higher I recall, I
was building the trunk llvm-project with GCC.
Can the future update to LLVM/Clang make GCC also usable in terms of
building a toolchain which has OpenMP offload
capabilities?
Thanks,
Itaru.
On Sat, Mar 16, 2019 at 6:57 PM Jonas Hahnfeld <hahnjo at hahnjo.de> wrote:
> Hi,
>
> On 2019-03-16 09:09, Itaru Kitayama via Openmp-dev wrote:
> > Doru et al.,
> > After checking the CUDA_ROOT environment variable gets set properly, I
> > configured the
> > Makefile for my application with CMake, however:
> >
> > -- Could NOT find LIBOMPTARGET_DEP_LIBFFI (missing:
> > LIBOMPTARGET_DEP_LIBFFI_LIBRARIES
> > LIBOMPTARGET_DEP_LIBFFI_INCLUDE_DIRS)
> > CMake Warning (dev) at
> >
> /p/project/cjzam11/kitayama1/projects/llvm-project/openmp/libomptarget/cmake/Modules/LibomptargetGetDependencies.cmake:117
> > (find_package):
> > Policy CMP0074 is not set: find_package uses <PackageName>_ROOT
> > variables.
> > Run "cmake --help-policy CMP0074" for policy details. Use the
> > cmake_policy
> > command to set the policy and suppress this warning.
> >
> > Environment variable CUDA_ROOT is set to:
> >
> > /usr/local/software/jureca/Stages/2018b/software/CUDA/9.2.88
> >
> > For compatibility, CMake is ignoring the variable.
> > Call Stack (most recent call first):
> >
> >
> /p/project/cjzam11/kitayama1/projects/llvm-project/openmp/libomptarget/CMakeLists.txt:30
> > (include)
> > This warning is for project developers. Use -Wno-dev to suppress it.
> >
> > -- LIBOMPTARGET: Building offloading runtime library libomptarget.
> > -- LIBOMPTARGET: Not building aarch64 offloading plugin: machine not
> > found in the system.
> > -- LIBOMPTARGET: Building CUDA offloading plugin.
> > -- LIBOMPTARGET: Not building PPC64 offloading plugin: machine not
> > found in the system.
> > -- LIBOMPTARGET: Not building PPC64le offloading plugin: machine not
> > found in the system.
> > -- LIBOMPTARGET: Not building x86_64 offloading plugin: libffi
> > dependency not found.
> > -- LIBOMPTARGET: Building CUDA offloading device RTL.
>
> This looks good so far: You'll get the CUDA offloading plugin and the
> pure CUDA device RTL.
> (libffi is needed for host-offloading which you don't need for Nvidia
> GPUs...)
>
> > CMake Error at
> >
> /p/project/cjzam11/kitayama1/projects/llvm-project/openmp/libomptarget/cmake/Modules/LibomptargetUtils.cmake:26
> > (message):
> > LIBOMPTARGET: Cannot build CUDA LLVM bitcode offloading device RTL!
> > Call Stack (most recent call first):
> >
> >
> /p/project/cjzam11/kitayama1/projects/llvm-project/openmp/libomptarget/deviceRTLs/nvptx/CMakeLists.txt:115
> > (libomptarget_error_say)
>
> This is the code path when you manually specify
> LIBOMPTARGET_NVPTX_ENABLE_BCLIB, but have no capable compiler. This
> needs a (more or less) recent Clang compiler, what's your
> CMAKE_CXX_COMPILER?
>
> Regarding the earlier errors about manually specified variables: Yes,
> the warning about LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES could be
> related to CMake not finding CUDA, but the one about
> CLANG_OPENMP_NVPTX_DEFAULT_ARCH is not: Clang does not have a build-time
> dependency to CUDA and this variable is used unconditionally. Are you
> sure your set -DLLVM_ENABLE_PROJECTS=clang;openmp without typos in the
> initial cmake invocation? (you don't need llvm because that's the root
> project that you're pointing CMake to)
>
> Cheers,
> Jonas
>
> > I'm at today's HEAD of Trunk of llvm-project.
> >
> > On Sat, Mar 16, 2019 at 6:27 AM Gheorghe-Teod Bercea
> > <Gheorghe-Teod.Bercea at ibm.com> wrote:
> >
> >> This typically happens when cmake cannot find the CUDA installation.
> >>
> >> Thanks,
> >>
> >> --Doru
> >>
> >> From: Itaru Kitayama via Openmp-dev
> >> <openmp-dev at lists.llvm.org>
> >> To: Lukas Sommer <sommer at esa.tu-darmstadt.de>
> >> Cc: openmp-dev at lists.llvm.org
> >> Date: 03/15/2019 04:50 PM
> >> Subject: Re: [Openmp-dev] OpenMP offloading to the sm_35
> >> device from x86 compute nodes
> >> Sent by: "Openmp-dev" <openmp-dev-bounces at lists.llvm.org>
> >>
> >> -------------------------
> >>
> >> At the HEAD of Trunk of llvm-project, CMake seems to disregards
> >> these variables:
> >> [...]
> >> CMake Warning:
> >> Manually-specified variables were not used by the project:
> >>
> >> CLANG_OPENMP_NVPTX_DEFAULT_ARCH
> >> LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES
> >>
> >> Have you had a chance to build the latest one?
> >>
> >> On Fri, Mar 15, 2019 at 6:28 PM Lukas Sommer via Openmp-dev
> >> <openmp-dev at lists.llvm.org> wrote:
> >> Hi,
> >>
> >> I've been building the offloading toolchain for Nvidia GPUs on
> >> x86-systems before and found Jonas Hahnfeld's blog-post extremely
> >> useful to setup the compiler:
> >>
> >>
> >
> https://www.hahnjo.de/blog/2018/10/08/clang-7.0-openmp-offloading-nvidia.html
> >> [1]
> >>
> >> Best regards,
> >>
> >> Lukas Sommer
> >>
> >> On 3/15/19 10:23 AM, Alexey Bataev via Openmp-dev wrote:
> >> I'm not sure about it, there are some others who can help with this.
> >>
> >> Best regards,
> >> Alexey Bataev
> >>
> >> 15 марта 2019 г., в 5:08, Itaru Kitayama
> >> <itaru.kitayama at gmail.com> написал(а):
> >>
> >> Thanks. Does setting
> >>
> >> LLVM_ENABLE_PROJECTS:STRING=clang;openmp;llvm
> >>
> >> enough to create the corresponding .bc lib?
> >>
> >> On Fri, Mar 15, 2019 at 6:01 PM Alexey Bataev <a.bataev at hotmail.com>
> >> wrote:
> >> Yes, it should support it.
> >>
> >> Best regards,
> >> Alexey Bataev
> >>
> >>> 15 марта 2019 г., в 4:55, Itaru Kitayama via Openmp-dev
> >> <openmp-dev at lists.llvm.org> написал(а):
> >>>
> >>> Hi,
> >>> I'm wondering if LLVM/Clang supports OpenMP offloading to NVIDA
> >>> targets from x86 nodes.
> >>>
> >>> Thanks,
> >>> Itaru.
> >>> _______________________________________________
> >>> Openmp-dev mailing list
> >>> Openmp-dev at lists.llvm.org
> >>> https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev [2]
> >>
> >> _______________________________________________
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> >> Openmp-dev at lists.llvm.org
> >> https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev [2]
> >>
> >> _______________________________________________
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> >> [2]_______________________________________________
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> >> https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev [2]
> >
> >
> > Links:
> > ------
> > [1]
> >
> https://www.hahnjo.de/blog/2018/10/08/clang-7.0-openmp-offloading-nvidia.html
> > [2] https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
> > _______________________________________________
> > Openmp-dev mailing list
> > Openmp-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
>
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