CODEWITHSUNDEEP
c++c++17std
Ralf
Ralf

Reputation: 1295

C++ compiler support for std::execution (parallel STL algorithms)

I wanted to use the parallel version of std::sort where I can specify an execution policy like std::execution::par_unseq.

I'm currently using clang++-10 and g++ 7.5.0 under Ubuntu Linux, but both don't find the required include file execution, so apparently the parallel algorithm is not yet supported in these compiler versions.

Can someone please tell me which version of clang and gcc would support this feature?

Upvotes: 6

Views: 4730

Answers (2)

Adam
Adam

Reputation: 17379

poolSTL is a single-header implementation of some parallel C++17 algorithms, including sort:

#include <poolstl/poolstl.hpp>

std::sort(poolstl::par, vec.begin(), vec.end());

It works on GCC 7 and versions of Clang missing native support.

There's also pluggable_sort to parallelize other fast sequential sorts, like pdqsort:

poolstl::pluggable_sort(poolstl::par, vec.begin(), vec.end(), pdqsort);

Upvotes: 4

Fedor
Fedor

Reputation: 21307

C++17 execution policies are supported by GCC 10 and Clang 11.

Here is a demo example https://gcc.godbolt.org/z/xahs5x1Kx

#include <execution>

int main()
{
    int a[] = {2,1};
    std::sort(std::execution::par_unseq, std::begin(a), std::end(a) );
    return a[0];
}

Upvotes: 4

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