getrf_batch_scratchpad_sizeΒΆ

Computes size of scratchpad memory required for the getrf_batch function.

Description

getrf_batch_scratchpad_size supports the following precisions.

T

float

double

std::complex<float>

std::complex<double>

Group API

Computes the number of elements of type T the scratchpad memory should able to hold to be passed to the Group API of the getrf_batch function.

Syntax

namespace oneapi::mkl::lapack {
  template <typename T>
  std::int64_t getrf_batch_scratchpad_size(cl::sycl::queue &queue, std::int64_t *m, std::int64_t *n, std::int64_t *lda, std::int64_t group_count, std::int64_t *group_sizes)
}

Input Parameters

queue

Device queue where calculations will be performed.

m

Array of group_count parameters \(m_g\) specifying the number of rows in the matrices belonging to group \(g\).

n

Array of group_count parameters \(n_g\) specifying the number of columns in matrices belonging to group \(g\).

lda

Array of group_count parameters \(\text{lda}_g\) specifying the leading dimensions of matrices belonging to group \(g\).

group_count

Number of groups of parameters. Must be at least 0.

group_sizes

Array of group_count integers. Array element with index \(g\) specifies the number of problems to solve for each of the groups of parameters \(g\). So the total number of problems to solve, batch_size, is a sum of all parameter group sizes.

Return Values

Number of elements of type T the scratchpad memory should able to hold to be passed to the Group API of the getrf_batch function.

Strided API

Computes the number of elements of type T the scratchpad memory should able to hold to be passed to the Strided API of the getrf_batch function.

Syntax

namespace oneapi::mkl::lapack {
  template <typename T>
  std::int64_t getrf_batch_scratchpad_size(cl::sycl::queue &queue, std::int64_t m, std::int64_t n, std::int64_t lda, std::int64_t stride_a, std::int64_t stride_ipiv, std::int64_t batch_size)
};

Input Parameters

queue

Device queue where calculations will be performed.

m

Number of rows in the matrices \(A_i\) (\(0 \le m\)).

n

Number of columns in \(A_i\) (\(0 \le n\)).

lda

Leading dimension of \(A_i\).

stride_a

Stride between the beginnings of matrices \(A_i\) inside the batch array a.

stride_ipiv

Stride between the beginnings of arrays \(\text{ipiv}_i\) inside the array ipiv.

batch_size

Number of problems in a batch.

Return Values

Number of elements of type T the scratchpad memory should able to hold to be passed to the Strided API of the getrf_batch function.

Parent topic: LAPACK-like Extensions Routines