3.1.3.2. CPUs in node¶

template<class T> class chase::mpi::ChaseMpiDLABlaslapack : public chase::mpi::ChaseMpiDLAInterface<T>¶

A derived class of ChaseMpiDLAInterface which implements the inter-node computation for a pure-CPU MPI-based implementation of ChASE.

Public Functions

ChaseMpiDLABlaslapack(ChaseMpiProperties<T> *matrix_properties, ChaseMpiMatrices<T> &matrices)¶

Parameters

matrix_properties: it is an object of ChaseMpiProperties, which defines the MPI environment and data distribution scheme in ChASE-MPI.
matrices: it is an instance of ChaseMpiMatrices, which allocates the required buffers in ChASE-MPI.

void preApplication(T *V, std::size_t locked, std::size_t block) override¶: This function set initially the operation for apply() in filter.

void apply(T alpha, T beta, std::size_t offset, std::size_t block, std::size_t locked) override¶

bool postApplication(T *V, std::size_t block, std::size_t locked) override¶

All required operations for this function has been done in for ChaseMpiDLA::postApplication().
This function contains nothing in this class.

void shiftMatrix(T c, bool isunshift = false) override¶

This function performs the shift of diagonal of a global matrix

This global is already distributed, so the shifting operation takes place on the local block of global matrix on each MPI proc.
This function is naturally in parallel among all MPI procs.

void applyVec(T *B, T *C) override¶

All required operations for this function has been done in for ChaseMpiDLA::applyVec().
This function contains nothing in this class.

void axpy(std::size_t N, T *alpha, T *x, std::size_t incx, T *y, std::size_t incy) override¶: It is an interface to BLAS ?axpy.

void scal(std::size_t N, T *a, T *x, std::size_t incx) override¶: It is an interface to BLAS ?scal.

Base<T> nrm2(std::size_t n, T *x, std::size_t incx) override¶: It is an interface to BLAS ?nrm2.

T dot(std::size_t n, T *x, std::size_t incx, T *y, std::size_t incy) override¶: It is an interface to BLAS ?dot.