DPC++ setup question

[Kirk]

Apololgies for a total newbie question. I never tried GPU programming before.

I have Intel OneAPI version 2021.3.0 for Windows, the Intel oneAPI Programming Guide and on a suggestion there I have the book Data Parallel C++ (many authors, Apress). I'm stuck on the hello world program from the book.

I'm working on the command line, not in Visual Studio. I believe I need an argument to the setvars.bat file that I can't figure out. Normally I can run the C++ compiler without problem (icl command). I only have trouble with icx. When I use that the compile will fail because it's missing CL/sycl.hpp. If I manually add the folder ...\latest\windows\include\sysl to the INCLUDE path, then I can compile but not link. If I specifically add sycl.lib to the link command then I can link but with a warning "multiple '__CLANG_OFFLOAD_BUNDLE__openmp-s' sections". If I run the resulting binary anyway an exception is thrown.

I think I'm causing the problem by trying to modify the environment myself. There must be some parameter I need to setvars to set this stuff up properly for me, but I haven't found it.

Many thanks for your patience!

[Kirk]

Possibly I found my own answer, but I hope not. If I use dpcpp rather than icx, use /I to add to the include path and explicitly list a total of 5 libraries on the link command then it compiles, links and runs. setvars creates a pretty simple environment for icl and I was expecting the same for DPC++. Perhaps that is just wrong.

[ShivaniK_Intel · Accepted solution]

Hi,

Thanks for reaching out to us.

Below are the steps for initializing one API environment in Command Prompt:

Method 1:

Step 1: Open Windows Command Prompt 

Step 2 : cd <install-dir> the Intel one API installation directory (by default, C:\Program Files (x86)\Intel\oneAPI).

Step 3: Launch setvars.bat which will initialize the complete one API Environment.

Method 2:

Open "Intel one API command prompt for Intel 64 for Visual Studio 2019" from the Windows Search Bar.

This will automatically initialize the Intel one API Environment. You can use all the compilers(icl,icx,dpcpp etc)

In order to check whether the environment is initialized properly or not check with the below command:

icx --version

Once the setvars.bat is done successfully you can compile the sample hello world program from the book Data-Parallel C++(many authors, Apress).

Using dpcpp :

Compilation command :dpcpp hello_world.cpp

Execution command: hello_world.exe

Using icx:

Compilation command : icx -fsycl -fsycl-unnamed-lambda hello_world.cpp

Execution command : hello_world.exe

You can refer to the attachment for the sample hello_world program.

Thanks & Regards

Shivani

[Zippy_Pinhead]

I am seeing a similar problem that is not fixed by running setvars.sh.

I'm running on Ubuntu Linux with Kernel version 18.04.1 (x86_64 SMP).

This is the error:

toddb@zippy $ icx -fsycl -fsycl-unnamed-lambda hello_world.cpp
hello_world.cpp:1:10: fatal error: 'CL/sycl.hpp' file not found
#include <CL/sycl.hpp>
^~~~~~~~~~~~~
1 error generated.

This is the output from setvars.sh:

:: initializing oneAPI environment ...
-bash: BASH_VERSION = 4.4.20(1)-release
:: advisor -- latest
:: ccl -- latest
:: compiler -- latest
:: dal -- latest
:: debugger -- latest
:: dev-utilities -- latest
:: dnnl -- latest
:: dpcpp-ct -- latest
:: dpl -- latest
:: intelpython -- latest
:: ipp -- latest
:: ippcp -- latest
:: mkl -- latest
:: mpi -- latest
:: tbb -- latest
:: vpl -- latest
:: vtune -- latest
:: oneAPI environment initialized ::

Here is my $PATH variable value:

toddb@zippy $ echo $PATH
/Developer/NVIDIA/CUDA-5.5/bin:/opt/intel/compilers_and_libraries_2020.4.304/linux/bin/intel64:/opt/intel/compilers_and_libraries_2020.4.304/linux/bin:/opt/intel/compilers_and_libraries_2020.4.304/linux/mpi/intel64/libfabric/bin:/opt/intel/compilers_and_libraries_2020.4.304/linux/mpi/intel64/bin:/opt/intel/oneapi/vtune/2021.7.1/bin64:/opt/intel/oneapi/vpl/2021.4.0/bin:/opt/intel/oneapi/mpi/2021.3.0//libfabric/bin:/opt/intel/oneapi/mpi/2021.3.0//bin:/opt/intel/oneapi/mkl/2021.3.0/bin/intel64:/opt/intel/oneapi/intelpython/latest/bin:/opt/intel/oneapi/intelpython/latest/condabin:/opt/intel/oneapi/dpcpp-ct/2021.3.0/bin:/opt/intel/oneapi/dev-utilities/2021.3.0/bin:/opt/intel/oneapi/debugger/10.2.4/gdb/intel64/bin:/opt/intel/oneapi/compiler/2021.3.0/linux/lib/oclfpga/llvm/aocl-bin:/opt/intel/oneapi/compiler/2021.3.0/linux/lib/oclfpga/bin:/opt/intel/oneapi/compiler/2021.3.0/linux/bin/intel64:/opt/intel/oneapi/compiler/2021.3.0/linux/bin:/opt/intel/oneapi/advisor/2021.3.0/bin64:/home/toddb/.todd_bin:/usr/local/bin:/usr/local/sbin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/toddb/bin

Thank you in advance for any help with this issue.

-Zippy

[Zippy_Pinhead]

I am using Ubuntu 18.04.6 on x86_64.

When I first tried to run your hello_world.cpp, I was seeing this error:

toddb@zippy $ icx -fsycl -fsycl-unnamed-lambda hello_world.cpp
hello_world.cpp:1:10: fatal error: 'CL/sycl.hpp' file not found
#include <CL/sycl.hpp>
^~~~~~~~~~~~~
1 error generated.

That error was caused by the install of

$ apt install intel-basekit

failing to require the package "intel-oneapi-compiler-dpcpp-cpp-common" as a prequequisite.

Once I installed "intel-oneapi-compiler-dpcpp-cpp-common" by hand, I am now getting these errors when I try to compile your hello_world.cpp:

toddb@zippy $ dpcpp hello_world.cpp
In file included from hello_world.cpp:1:
In file included from /opt/intel/oneapi/compiler/latest/linux/include/sycl/CL/sycl.hpp:11:
In file included from /opt/intel/oneapi/compiler/latest/linux/include/sycl/CL/sycl/accessor.hpp:13:
In file included from /opt/intel/oneapi/compiler/latest/linux/include/sycl/CL/sycl/buffer.hpp:11:
In file included from /opt/intel/oneapi/compiler/latest/linux/include/sycl/CL/sycl/detail/buffer_impl.hpp:19:
/opt/intel/oneapi/compiler/latest/linux/include/sycl/CL/sycl/types.hpp:2336:48: error: 'T' does not refer to a value
using FieldT = decltype(__builtin_field_type(T, NumFieldsToCheck - 1));
^
/opt/intel/oneapi/compiler/latest/linux/include/sycl/CL/sycl/types.hpp:2333:20: note: declared here
template <typename T, unsigned NumFieldsToCheck>
^
...
<many more similar errors>

Do you have any suggestions?

-Zippy

[ShivaniK_Intel]

Hi,

Thanks for accepting our solution. If you need any additional information, please post a new question as this thread will be no longer monitored by Intel.

Thanks & Regards

Shivani