The descriptor class template

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 10/31/2024

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The descriptor class template

This page describes the descriptor class template, which belongs to the oneapi::mkl::dft namespace and is declared in oneapi/mkl/dft.hpp (file to be included).

namespace oneapi::mkl::dft {
  template <precision prec, domain dom>
  class descriptor;
}

The usage of prepended namespace specifiers oneapi::mkl::dft is omitted below for conciseness.

Users of the DPC++ interface of oneMKL must use instances of a specialization of this class template to specify and fully configure the required DFT computation(s): successfully-committed objects of a (specialized) descriptor class are required arguments to the DFT-specific compute functions.

Template parameters

The descriptor class template is parameterized by two non-type template parameters, in the following order:

a value of typeprecision, that determines the floating-point format to be considered by its instances;
a value of typedomain, that determines the type of forward domain to be considered by its instances.

Instances of a descriptor class specialized with value precision::SINGLE (resp. precision::DOUBLE) for the former are referred to as “single-precision descriptors” (resp. “double-precision descriptors”). Similarly, instances of a descriptor class specialized with value domain::COMPLEX (resp. domain::REAL) for the latter are referred to as “complex descriptors” (resp. “real descriptors”).

NOTE:

Some GPU devices do not support double-precision descriptors. It is recommended to verify that the targeted device does support double-precision floating-point arithmetic before using a double-precision descriptor on that device.

Member functions

Considering objects of any descriptor class, users may

create and delete them via the constructors and destructors;
modify their configuration via the configuration-setting member functions;
query their configuration via the configuration-querying member functions;
commit them to the DFT computation(s) that they define onto a specific sycl::queue instance;
equip them with their own device-accessible memory allocation for the object’s workspace, by using the workspace-related member functions (feature specific to GPU-committed descriptors).

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The descriptor class template

Template parameters

Member functions