trtrs_scratchpad

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 7/13/2023

Version

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Visible to Intel only — GUID: GUID-8257C69A-229F-47B0-8F67-17A6DAA83258

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trtrs_scratchpad_size

Computes size of scratchpad memory required for trtrs (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 trtrs (buffer or USM version) function must be able to hold.

API

Syntax

namespace oneapi::mkl::lapack {
  template<typename T>
  std::int64_t trtrs_scratchpad_size(sycl::queue &queue,
  mkl::uplo uplo,
  mkl::transpose trans,
  mkl::diag diag,
  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 trtrs (buffer or USM version) function will be performed.

uplo

Indicates whether A is upper or lower triangular:

If uplo = uplo::upper, then A is upper triangular.

If uplo = uplo::lower, then A is lower triangular.

trans

If trans = transpose::nontrans, then A*X = B is solved for X.

If trans = transpose::trans, then A^T*X = B is solved for X.

If trans = transpose::conjtrans, then A^H*X = B is solved for X.

diag

If diag = diag::nonunit, then A is not a unit triangular matrix.

If diag = diag::unit, then A is unit triangular: diagonal elements of A are assumed to be 1 and not referenced in the array a.

n

The order of A; the number of rows in B; n `` ≥ 0``.

nrhs

The number of right-hand sides; nrhs`` ≥ 0``.

lda

The leading dimension of a; lda`` ≥ max(1, n)``.

ldb

The leading dimension of b; ldb`` ≥ max(1, n)``.

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 trtrs (buffer or USM version) function must be able to hold.

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