topic Re:Sycl 2020 on devcloud? in Intel® oneAPI DPC++/C++ Compiler

Sycl 2020 on devcloud?

Victor_E_1 — Wed, 03 Feb 2021 15:11:37 GMT

How much of SYCL 2020 is availabe on the devcloud?

reduct1d.cxx:45:38: error: no member named 'reducer' in namespace 'cl::sycl' auto scalar_accessor = sycl::reducer ~~~~~~^

Re:Sycl 2020 on devcloud?

AbhishekD_Intel — Fri, 05 Feb 2021 13:40:00 GMT

Hi,

Thanks for reaching out to us.

If you want more details regarding the SYCL specification and DPC++, then please follow the below link it will give you complete details.

https://spec.oneapi.com/versions/latest/elements/dpcpp/source/index.html#extensions-table

From the error log, it's hard to come up with a conclusion regarding your issue, so if you have any issue regarding the reducer class which you are trying to use or reduction function please send us a small reproducer of your code so that we will get more insight into your issue.

Warm Regards,

Abhishek

Re: Re:Sycl 2020 on devcloud?

Victor_E_1 — Fri, 05 Feb 2021 17:42:57 GMT

Thanks for that table. That is useful. Here is my code and error message:

dpcpp -c reductscalar.cxx -std=c++17 -O2 -g reductscalar.cxx:42:11: error: no member named 'reduction' in namespace 'cl::sycl' sycl::reduction( sum_array, static_cast<float>(0.), std::plus<float>() ); ~~~~~~^ 1 error generated. #include <CL/sycl.hpp> #include <iostream> #include <vector> using std::vector; #include <cstdio> using namespace cl; int main() { sycl::cpu_selector selector; sycl::queue myqueue(selector); auto ctx = myqueue.get_context(); auto dev = myqueue.get_device(); int array_size; std::cin >> array_size; float *shared_array = (float*) malloc_shared( array_size*sizeof(float),dev,ctx ); float *sum_array = (float*) malloc_shared( sizeof(float),dev,ctx ); float check_sum = 0.; for (int i=0; i<array_size; i++) { shared_array[i] = static_cast<float>(i); check_sum += shared_array[i]; } sycl::range<1> array_range{static_cast<size_t>(array_size)}; //codesnippet syclsumreduct auto reduce_to_sum = sycl::reduction( sum_array, static_cast<float>(0.), std::plus<float>() ); myqueue.parallel_for// parallel_for<reduction_kernel<T,BinaryOp,__LINE__>> ( array_range, // sycl::range<1>(input_size), reduce_to_sum, // sycl::reduction(output, identity, op), [=] (sycl::id<1> idx, auto& reducer) { // type of reducer is impl-dependent, so use auto reducer.combine(shared_array[idx[0]]); //(input[idx[0]]); //reducer += shared_array[idx[0]]; // see line 216: add_reducer += input0[idx[0]]; } ).wait(); //codesnippet end printf("Sum= %e, s/b=%e\n",sum_array[0],check_sum); return 0; }

Re:Sycl 2020 on devcloud?

AbhishekD_Intel — Thu, 11 Feb 2021 06:47:36 GMT

Hi,

Thanks for the code snippet. We can see that you are trying to access reduction from sycl namespace, but the reduction functionality is present in a different namespace.

As you are trying to run your code on the Devcloud the SYCL_COMPILER_VERSION is greater than 20200827, so try using sycl::ONEAPI::reduction(....), this will not give the error on reduction function.

There is one more issue with your code, you are just using range with index with a reduction, but the reduction should be used with nd_range and nd_item in the data-parallel kernel.

You can follow the below syntax for reference.

using namespace sycl;

handler.parallel_for(

nd_range<1>{global_range, local_range},

ONEAPI::reduction(sum, plus<>()),

[=](nd_item<1> it, auto& sum) {

int i = it.get_global_id(0);

sum += data[i];

});

For more details please refer to the below OneAPI Samples (GSimulation.cpp)

https://github.com/oneapi-src/oneAPI-samples/tree/master/DirectProgramming/DPC%2B%2B/N-BodyMethods/Nbody

Hope the provided details will solve your issue.

Warm Regards,

Abhishek

Re:Sycl 2020 on devcloud?

AbhishekD_Intel — Thu, 18 Feb 2021 10:32:47 GMT

Hi,

Please give us an update on the provided details and do let us know if it had solved your issue.

Warm Regards,

Abhishek

Re: Re:Sycl 2020 on devcloud?

Victor_E_1 — Fri, 19 Feb 2021 00:56:13 GMT

Abhishek,

the Sycl 2020 standard just came out, so I'm reluctant to use solutions that are based on Intel-only namespaces.

What are the plans for implementing the 2020 standard?

Victor.

Re:Sycl 2020 on devcloud?

AbhishekD_Intel — Wed, 24 Feb 2021 13:27:31 GMT

Hi Victor,

I will forward your question to the subject matter expert for more details regarding the implementation of the latest SYCL standard.

Please expect a reply in this same thread.

Warm Regards,

Abhishek

Re:Sycl 2020 on devcloud?

Varsha_M_Intel — Wed, 03 Mar 2021 22:11:09 GMT

some of the SYCL2020 features are already in DPC++ Compiler initial release and we will continue to add support for more in future releases. A comprehensive list will be released soon.

Re:Sycl 2020 on devcloud?

Varsha_M_Intel — Wed, 19 May 2021 15:33:46 GMT

Please find the below as list of SYCL 2020 features with oneAPI.

https://software.intel.com/content/www/us/en/develop/articles/sycl-2020-features-dpc-language-oneapi-c.html