potrs_batch_scratchpad_size (Strided Version)

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 7/13/2023

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potrs_batch_scratchpad_size (Strided Version)

Computes size of scratchpad memory required for potrs_batch (Strided 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_batch (Strided Version) function must be able to hold.

API

Syntax

namespace oneapi::mkl::lapack {
   std::int64_t potrs_batch_scratchpad_size(
      sycl::queue &queue,
      mkl::uplo uplo,
      std::int64_t n,
      std::int64_t nrhs,
      std::int64_t lda,
      std::int64_t stride_a,
      std::int64_t ldb,
      std::int64_t stride_b,
      std::int64_t batch_size)
}

Input Parameters

queue

Device queue where calculations will be performed.

uplo

Indicates how the input matrix has been factored:

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

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

n

The order of the matrices A_i (n ≥ 0).

nrhs

The number of right hand sides (nrhs ≥ 0).

lda

The leading dimension of A_i (lda ≥ max(1, n)).

stride_a

The stride between the beginnings of matrices inside the batch array a (stride_a ≥ max(1, lda * n)).

ldb

The leading dimensions of B_i (ldb ≥ max(1, n)).

stride_b

The stride between the beginnings of matrices B_i inside the batch array b (stride_b ≥ max(1, ldb * nrhs)).

batch_size

The number of problems in a batch (batch_size ≥ 0).

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_batch (Strided Version) function must be able to hold.

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oneMKL - Data Parallel C++ Developer Reference

potrs_batch_scratchpad_size (Strided Version)

Description

API