Something went wrong when trying SYCL reduction variables with oneAPI

JamesFBM — Tue, 07 Feb 2023 04:20:59 GMT

Hi, I'm new to SYCL and am trying to run an example about reduction variables in the SYCL Specification. I revise the code a little and the final version is shown as follows:

#include <iostream> #include <sycl/sycl.hpp> #include <numeric> using namespace sycl; int main() { buffer<int> valuesBuf{ 1024 }; { host_accessor a{ valuesBuf }; // std::iota(a.begin(), a.end(), 0); std::iota(&(a[0]), &(a[1023]), 0); } int sumResult = 0; buffer<int> sumBuf{ &sumResult, 1 }; int maxResult = 0; buffer<int> maxBuf{ &maxResult, 1 }; queue myQueue; myQueue.submit([&](handler& cgh) { auto inputValues = valuesBuf.get_access<access_mode::read>(cgh); auto sumReduction = reduction(sumBuf, cgh, plus<>()); auto maxReduction = reduction(maxBuf, cgh, maximum<>()); /* cgh.parallel_for(range<1> {2048, 1024}, sumReduction, maxReduction, [=](nd_item<1> it, auto& sum, auto& max) { sum += inputValues[it.get_local_id()]; max.combine(inputValues[it.get_global_id()]); }); */ cgh.parallel_for(nd_range<1> {2048, 1024}, sumReduction, maxReduction, [=](nd_item<1> it, auto& sum, auto& max) { sum += inputValues[it.get_local_id()]; max.combine(inputValues[it.get_global_id()]); }); }); // assert(maxBuf.get_host_access()[0] == 1023 && sumBuf.get_host_access()[0] == 523776); std::cout << maxBuf.get_host_access()[0] << std::endl; std::cout << sumBuf.get_host_access()[0] << std::endl; }

However, there is still something wrong with it which I cannot figure out the reasons. The problems are:

The code can be successfully compiled in cmd with command
icpx -fsycl src.cpp -o o.exewhile when compiled in Visual Studio 2022 with Intel(R) oneAPI DPC++ Compiler, it fails and pops out the errorSYCL kernel cannot call a variadic function SYCL kernel cannot call an undefined function without SYCL_EXTERNAL attributeI have seen a similar problem in Re: SYCL kernel cannot call an undefined function without SYCL_EXTERNAL attribute - Intel Communities and Re: SYCL kernel cannot call an undefined function without SYCL_EXTERNAL attribute - Intel Communities and believe that Line 38 functionmax.combine(inputValues[it.get_global_id()]);triggers the compilation error, but cannot find a suitable solution to my code.
Even without the compilation problem above, the program cannot function as expected. For the program prints out nothing and exits with a meaningless value. The commands are shown below:C:\Users\a1595\Desktop\dr\c>icpx -fsycl c.cpp -o c.exe C:\Users\a1595\Desktop\dr\c>c.exe C:\Users\a1595\Desktop\dr\c>echo %ERRORLEVEL% -1073740791A similar result also occurs in Visual Studio 2022 environment and I have no idea about it.

I am looking forward to any help. Thanks a lot.

Re:Something went wrong when trying SYCL reduction variables with oneAPI

AishwaryaCV_Intel — Wed, 08 Feb 2023 04:42:16 GMT

Hi,

Thank you for posting in intel communities.

Since this is a duplicate thread of <https://community.intel.com/t5/Intel-oneAPI-Data-Parallel-C/problems-about-SYCL-reduction-variables-using-oneAPI/m-p/1454057#M2774>, we will no longer monitor this thread. We will continue addressing this issue in the other thread.

Thanks And Regards,

Aishwarya

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Something went wrong when trying SYCL reduction variables with oneAPI

Re:Something went wrong when trying SYCL reduction variables with oneAPI