potrs_scratchpad_size

Intel® oneAPI Math Kernel Library (oneMKL) - Data Parallel C++ Developer Reference

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ID 772045

Date 12/16/2022

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potrs_scratchpad_size

Computes size of scratchpad memory required for potrs (USM Version) function. This routine belongs to the oneapi::mkl::lapack namespace.

Description
API

Description

Computes the number of elements of type T the scratchpad memory to be passed to the potrs (buffer or USM version) function must be able to hold.

API

Syntax

namespace oneapi::mkl::lapack {
   template<typename T>
   std::int64_t potrs_scratchpad_size(
   sycl::queue &queue,
   mkl::uplo uplo,
   std::int64_t n,
   std::int64_t nrhs,
   std::int64_t lda,
   std::int64_t ldb)
}

Input Parameters

queue

Device queue where calculations by the potrs (buffer or USM version) function will be performed.

uplo

Indicates how the input matrix has been factored:

If uplo=mkl::uplo::upper, the upper triangle U of A is stored, where A = U^T*U for real data, A = U^H*U for complex data.

If uplo=mkl::uplo::lower, the upper triangle L of A is stored, where A = L*L^T for real data, A = L*L^H for complex data.

n

The order of matrix A (0 ≤ n).

nrhs

The number of right-hand sides (0 ≤ nrhs).

lda

The leading dimension of A.

ldb

The leading dimension of B.

Exceptions

Exception	Description
`mkl::lapack::exception`	This exception is thrown when an incorrect argument value is supplied. You can determine the position of the incorrect argument by the `info()` method of the exception object.

Return Values

The number of elements of type T the scratchpad memory to be passed to the potrs (buffer or USM version) function must be able to hold.

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