Process-wide singleton that selects how ArrayTransformer packs and waits for MPI messages. More...

#include <MPI.hpp>

Public Types
enum	ArrayCommType { UnknownArrayCommType = 0 , HIndexed = 1 , InSituPack = 2 }
	Which derived-type strategy ArrayTransformer should use. More...

Public Member Functions
ArrayCommType	GetArrayStrategy ()
	Current array-pack strategy.

void	SetArrayStrategy (ArrayCommType t)
	Override the array-pack strategy (affects subsequently-created transformers).

bool	GetUseStrongSyncWait () const
	Whether barriers are inserted around Waitall for profiling.

bool	GetUseAsyncOneByOne () const
	Whether transformers should use one-by-one Isend/Irecv.

double	GetUseLazyWait () const
	Polling interval (ns) for MPI::WaitallLazy. `0` means use `MPI_Waitall`.

Static Public Member Functions
static CommStrategy &	Instance ()
	Access the process-wide singleton.

Static Public Attributes
static const int	Ntype = 10

Detailed Description

Process-wide singleton that selects how ArrayTransformer packs and waits for MPI messages.

Settings affect every transformer:

ArrayCommType: HIndexed (default: MPI_Type_create_hindexed derived types) vs InSituPack (manual memcpy into contiguous send/recv buffers). The latter can be faster on networks where derived types pay large unpacking overhead.
UseStrongSyncWait: insert barriers around wait calls for easier profiling.
UseAsyncOneByOne: issue per-peer Isend/ Irecv instead of one persistent Startall.
UseLazyWait: poll interval (ns) used by MPI::WaitallLazy.

Must be constructed under MPI_COMM_WORLD. Thread-safe C++11 singleton.

Definition at line 728 of file MPI.hpp.

Member Enumeration Documentation

◆ ArrayCommType

enum DNDS::MPI::CommStrategy::ArrayCommType

Which derived-type strategy ArrayTransformer should use.

Enumerator
UnknownArrayCommType	Sentinel / uninitialised.
HIndexed	Use `MPI_Type_create_hindexed` derived types (default).
InSituPack	Manually pack / unpack into contiguous buffers.

Definition at line 732 of file MPI.hpp.

Member Function Documentation

◆ GetArrayStrategy()

CommStrategy::ArrayCommType DNDS::MPI::CommStrategy::GetArrayStrategy ( )

Current array-pack strategy.

Definition at line 421 of file MPI.cpp.

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◆ GetUseAsyncOneByOne()

bool DNDS::MPI::CommStrategy::GetUseAsyncOneByOne ( ) const

Whether transformers should use one-by-one Isend/Irecv.

Definition at line 436 of file MPI.cpp.

◆ GetUseLazyWait()

double DNDS::MPI::CommStrategy::GetUseLazyWait ( ) const

Polling interval (ns) for MPI::WaitallLazy. 0 means use MPI_Waitall.

Definition at line 441 of file MPI.cpp.

◆ GetUseStrongSyncWait()

bool DNDS::MPI::CommStrategy::GetUseStrongSyncWait ( ) const

Whether barriers are inserted around Waitall for profiling.

Definition at line 431 of file MPI.cpp.

◆ Instance()

CommStrategy & DNDS::MPI::CommStrategy::Instance ( )

static

Access the process-wide singleton.

Definition at line 415 of file MPI.cpp.

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◆ SetArrayStrategy()

void DNDS::MPI::CommStrategy::SetArrayStrategy ( CommStrategy::ArrayCommType t )

Override the array-pack strategy (affects subsequently-created transformers).

Definition at line 426 of file MPI.cpp.

Member Data Documentation

◆ Ntype

const int DNDS::MPI::CommStrategy::Ntype = 10

static

Definition at line 739 of file MPI.hpp.

The documentation for this class was generated from the following files:

/home/runner/work/DNDSR/DNDSR/src/DNDS/MPI.hpp
/home/runner/work/DNDSR/DNDSR/src/DNDS/MPI.cpp

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes