A global linear system. More...

#include <CommMpi.h>

Inheritance diagram for Nektar::LibUtilities::CommMpi:

Public Member Functions
	CommMpi (int narg, char *arg[])

virtual	~CommMpi () override

MPI_Comm	GetComm ()

Public Member Functions inherited from Nektar::LibUtilities::Comm
	Comm (int narg, char *arg[])

virtual	~Comm ()

void	Finalise ()

int	GetSize () const
	Returns number of processes. More...

int	GetRank ()

const std::string &	GetType () const

void	Block ()
	Block execution until all processes reach this point. More...

NekDouble	Wtime ()
	Return the time in seconds. More...

template<class T >
void	Send (int pProc, T &pData)

template<class T >
void	Recv (int pProc, T &pData)

template<class T >
void	SendRecv (int pSendProc, T &pSendData, int pRecvProc, T &pRecvData)

template<class T >
void	SendRecvReplace (int pSendProc, int pRecvProc, T &pData)

template<class T >
void	AllReduce (T &pData, enum ReduceOperator pOp)

template<class T >
void	AlltoAll (T &pSendData, T &pRecvData)

template<class T1 , class T2 >
void	AlltoAllv (T1 &pSendData, T2 &pSendDataSizeMap, T2 &pSendDataOffsetMap, T1 &pRecvData, T2 &pRecvDataSizeMap, T2 &pRecvDataOffsetMap)

template<class T >
void	AllGather (T &pSendData, T &pRecvData)

template<class T >
void	AllGatherv (T &pSendData, T &pRecvData, Array< OneD, int > &pRecvDataSizeMap, Array< OneD, int > &pRecvDataOffsetMap)

template<class T >
void	AllGatherv (T &pRecvData, Array< OneD, int > &pRecvDataSizeMap, Array< OneD, int > &pRecvDataOffsetMap)

template<class T >
void	Bcast (T &pData, int pRoot)

template<class T >
void	Exscan (T &pData, enum ReduceOperator pOp, T &ans)

template<class T >
T	Gather (int rootProc, T &val)

template<class T >
T	Scatter (int rootProc, T &pData)

template<class T >
void	DistGraphCreateAdjacent (T &sources, T &sourceweights, int reorder)

template<class T1 , class T2 >
void	NeighborAlltoAllv (T1 &pSendData, T2 &pSendDataSizeMap, T2 &pSendDataOffsetMap, T1 &pRecvData, T2 &pRecvDataSizeMap, T2 &pRecvDataOffsetMap)

template<class T >
void	Irsend (int pProc, T &pData, int count, const CommRequestSharedPtr &request, int loc)

template<class T >
void	Isend (int pProc, T &pData, int count, const CommRequestSharedPtr &request, int loc)

template<class T >
void	SendInit (int pProc, T &pData, int count, const CommRequestSharedPtr &request, int loc)

template<class T >
void	Irecv (int pProc, T &pData, int count, const CommRequestSharedPtr &request, int loc)

template<class T >
void	RecvInit (int pProc, T &pData, int count, const CommRequestSharedPtr &request, int loc)

void	StartAll (const CommRequestSharedPtr &request)

void	WaitAll (const CommRequestSharedPtr &request)

CommRequestSharedPtr	CreateRequest (int num)

CommSharedPtr	CommCreateIf (int flag)
	If the flag is non-zero create a new communicator. More...

void	SplitComm (int pRows, int pColumns, int pTime=1)
	Splits this communicator into a grid of size pRows*pColumns and creates row and column communicators. By default the communicator is a single row. More...

CommSharedPtr	GetRowComm ()
	Retrieve the row communicator to which this process belongs. More...

CommSharedPtr	GetColumnComm ()
	Retrieve the column communicator to which this process belongs. More...

CommSharedPtr	GetTimeComm ()
	Retrieve the time communicator to which this process belongs. More...

CommSharedPtr	GetSpaceComm ()
	Retrieve the space communicator to which this process belongs. More...

bool	TreatAsRankZero ()

bool	IsSerial ()

std::tuple< int, int, int >	GetVersion ()

bool	RemoveExistingFiles ()

std::pair< CommSharedPtr, CommSharedPtr >	SplitCommNode ()

Static Public Member Functions
static CommSharedPtr	create (int narg, char *arg[])
	Creates an instance of this class. More...

Static Public Attributes
static std::string	className
	Name of class. More...

Protected Member Functions
	CommMpi (MPI_Comm pComm)

virtual void	v_Finalise () override

virtual int	v_GetRank () override final

virtual void	v_Block () override final

virtual double	v_Wtime () override final

virtual bool	v_TreatAsRankZero () override final

virtual bool	v_IsSerial () override final

virtual std::tuple< int, int, int >	v_GetVersion () override final

virtual void	v_Send (void *buf, int count, CommDataType dt, int dest) override final

virtual void	v_Recv (void *buf, int count, CommDataType dt, int source) override final

virtual void	v_SendRecv (void sendbuf, int sendcount, CommDataType sendtype, int dest, void recvbuf, int recvcount, CommDataType recvtype, int source) override final

virtual void	v_SendRecvReplace (void *buf, int count, CommDataType dt, int pSendProc, int pRecvProc) override final

virtual void	v_AllReduce (void *buf, int count, CommDataType dt, enum ReduceOperator pOp) override final

virtual void	v_AlltoAll (void sendbuf, int sendcount, CommDataType sendtype, void recvbuf, int recvcount, CommDataType recvtype) override final

virtual void	v_AlltoAllv (void sendbuf, int sendcounts[], int sensdispls[], CommDataType sendtype, void recvbuf, int recvcounts[], int rdispls[], CommDataType recvtype) override final

virtual void	v_AllGather (void sendbuf, int sendcount, CommDataType sendtype, void recvbuf, int recvcount, CommDataType recvtype) override final

virtual void	v_AllGatherv (void sendbuf, int sendcount, CommDataType sendtype, void recvbuf, int recvcounts[], int rdispls[], CommDataType recvtype) override final

virtual void	v_AllGatherv (void *recvbuf, int recvcounts[], int rdispls[], CommDataType recvtype) override final

virtual void	v_Bcast (void *buffer, int count, CommDataType dt, int root) override final

virtual void	v_Exscan (Array< OneD, unsigned long long > &pData, enum ReduceOperator pOp, Array< OneD, unsigned long long > &ans) override final

virtual void	v_Gather (void sendbuf, int sendcount, CommDataType sendtype, void recvbuf, int recvcount, CommDataType recvtype, int root) override final

virtual void	v_Scatter (void sendbuf, int sendcount, CommDataType sendtype, void recvbuf, int recvcount, CommDataType recvtype, int root) override final

virtual void	v_DistGraphCreateAdjacent (int indegree, const int sources[], const int sourceweights[], int reorder) override final

virtual void	v_NeighborAlltoAllv (void sendbuf, int sendcounts[], int sensdispls[], CommDataType sendtype, void recvbuf, int recvcounts[], int rdispls[], CommDataType recvtype) override final

virtual void	v_Irsend (void *buf, int count, CommDataType dt, int dest, CommRequestSharedPtr request, int loc) override final

virtual void	v_Isend (void *buf, int count, CommDataType dt, int dest, CommRequestSharedPtr request, int loc) override final

virtual void	v_SendInit (void *buf, int count, CommDataType dt, int dest, CommRequestSharedPtr request, int loc) override final

virtual void	v_Irecv (void *buf, int count, CommDataType dt, int source, CommRequestSharedPtr request, int loc) override final

virtual void	v_RecvInit (void *buf, int count, CommDataType dt, int source, CommRequestSharedPtr request, int loc) override final

virtual void	v_StartAll (CommRequestSharedPtr request) override final

virtual void	v_WaitAll (CommRequestSharedPtr request) override final

virtual CommRequestSharedPtr	v_CreateRequest (int num) override final

virtual void	v_SplitComm (int pRows, int pColumns, int pTime) override

virtual CommSharedPtr	v_CommCreateIf (int flag) override final

virtual std::pair< CommSharedPtr, CommSharedPtr >	v_SplitCommNode () override final

Protected Member Functions inherited from Nektar::LibUtilities::Comm
	Comm ()

virtual bool	v_RemoveExistingFiles ()

Protected Attributes
MPI_Comm	m_comm

int	m_rank {}

bool	m_controls_mpi

Protected Attributes inherited from Nektar::LibUtilities::Comm
int	m_size
	Number of processes. More...

std::string	m_type
	Type of communication. More...

CommSharedPtr	m_commRow
	Row communicator. More...

CommSharedPtr	m_commColumn
	Column communicator. More...

CommSharedPtr	m_commTime

CommSharedPtr	m_commSpace

Detailed Description

A global linear system.

Definition at line 91 of file CommMpi.h.

Constructor & Destructor Documentation

◆ CommMpi() [1/2]

Nektar::LibUtilities::CommMpi::CommMpi	(	int	narg,
		char *	arg[]
	)

Definition at line 53 of file CommMpi.cpp.

                                       : Comm(narg, arg)
 {
     int init = 0;
     MPI_Initialized(&init);
  
     if (!init)
     {
         ASSERTL0(MPI_Init(&narg, &arg) == MPI_SUCCESS,
                  "Failed to initialise MPI");
         // store bool to indicate that Nektar++ is in charge of finalizing MPI.
         m_controls_mpi = true;
     }
     else
     {
         // Another code is in charge of finalizing MPI and this is not the
         // responsiblity of Nektar++
         m_controls_mpi = false;
     }
  
     m_comm = MPI_COMM_WORLD;
     MPI_Comm_size(m_comm, &m_size);
     MPI_Comm_rank(m_comm, &m_rank);
  
 #ifdef NEKTAR_USING_PETSC
     PetscInitializeNoArguments();
 #endif
  
     m_type = "Parallel MPI";
 }

References ASSERTL0, m_comm, m_controls_mpi, m_rank, Nektar::LibUtilities::Comm::m_size, and Nektar::LibUtilities::Comm::m_type.

Referenced by v_CommCreateIf(), v_SplitComm(), and v_SplitCommNode().

◆ ~CommMpi()

Nektar::LibUtilities::CommMpi::~CommMpi ( )

overridevirtual

Definition at line 98 of file CommMpi.cpp.

 {
     int flag;
     MPI_Finalized(&flag);
     if (!flag && m_comm != MPI_COMM_WORLD)
     {
         MPI_Comm_free(&m_comm);
     }
 }

References m_comm.

◆ CommMpi() [2/2]

Nektar::LibUtilities::CommMpi::CommMpi ( MPI_Comm pComm )

explicitprotected

Definition at line 86 of file CommMpi.cpp.

                                : Comm()
 {
     m_comm = pComm;
     MPI_Comm_size(m_comm, &m_size);
     MPI_Comm_rank(m_comm, &m_rank);
  
     m_type = "Parallel MPI";
 }

References m_comm, m_rank, Nektar::LibUtilities::Comm::m_size, and Nektar::LibUtilities::Comm::m_type.

Member Function Documentation

◆ create()

static CommSharedPtr Nektar::LibUtilities::CommMpi::create	(	int	narg,
		char *	arg[]
	)

inlinestatic

Creates an instance of this class.

Definition at line 95 of file CommMpi.h.

     {
         return MemoryManager<CommMpi>::AllocateSharedPtr(narg, arg);
     }

References Nektar::MemoryManager< DataType >::AllocateSharedPtr().

◆ GetComm()

MPI_Comm Nektar::LibUtilities::CommMpi::GetComm ( )

Definition at line 111 of file CommMpi.cpp.

 {
     return m_comm;
 }

References m_comm.

◆ v_AllGather()

void Nektar::LibUtilities::CommMpi::v_AllGather	(	void *	sendbuf,
		int	sendcount,
		CommDataType	sendtype,
		void *	recvbuf,
		int	recvcount,
		CommDataType	recvtype
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 295 of file CommMpi.cpp.

 {
     int retval = MPI_Allgather(sendbuf, sendcount, sendtype, recvbuf, recvcount,
                                recvtype, m_comm);
  
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing Allgather.");
 }

References ASSERTL0, and m_comm.

◆ v_AllGatherv() [1/2]

void Nektar::LibUtilities::CommMpi::v_AllGatherv	(	void *	recvbuf,
		int	recvcounts[],
		int	rdispls[],
		CommDataType	recvtype
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 314 of file CommMpi.cpp.

 {
     int retval = MPI_Allgatherv(MPI_IN_PLACE, 0, MPI_DATATYPE_NULL, recvbuf,
                                 recvcounts, rdispls, recvtype, m_comm);
  
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing Allgatherv.");
 }

References ASSERTL0, and m_comm.

◆ v_AllGatherv() [2/2]

void Nektar::LibUtilities::CommMpi::v_AllGatherv	(	void *	sendbuf,
		int	sendcount,
		CommDataType	sendtype,
		void *	recvbuf,
		int	recvcounts[],
		int	rdispls[],
		CommDataType	recvtype
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 304 of file CommMpi.cpp.

 {
     int retval = MPI_Allgatherv(sendbuf, sendcount, sendtype, recvbuf,
                                 recvcounts, rdispls, recvtype, m_comm);
  
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing Allgather.");
 }

References ASSERTL0, and m_comm.

◆ v_AllReduce()

void Nektar::LibUtilities::CommMpi::v_AllReduce	(	void *	buf,
		int	count,
		CommDataType	dt,
		enum ReduceOperator	pOp
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 239 of file CommMpi.cpp.

 {
     if (GetSize() == 1)
     {
         return;
     }
  
     MPI_Op vOp;
     switch (pOp)
     {
         case ReduceMax:
             vOp = MPI_MAX;
             break;
         case ReduceMin:
             vOp = MPI_MIN;
             break;
         case ReduceSum:
         default:
             vOp = MPI_SUM;
             break;
     }
     int retval = MPI_Allreduce(MPI_IN_PLACE, buf, count, dt, vOp, m_comm);
  
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing All-reduce.");
 }

References ASSERTL0, Nektar::LibUtilities::Comm::GetSize(), m_comm, Nektar::LibUtilities::ReduceMax, Nektar::LibUtilities::ReduceMin, and Nektar::LibUtilities::ReduceSum.

◆ v_AlltoAll()

void Nektar::LibUtilities::CommMpi::v_AlltoAll	(	void *	sendbuf,
		int	sendcount,
		CommDataType	sendtype,
		void *	recvbuf,
		int	recvcount,
		CommDataType	recvtype
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 269 of file CommMpi.cpp.

 {
     int retval = MPI_Alltoall(sendbuf, sendcount, sendtype, recvbuf, recvcount,
                               recvtype, m_comm);
  
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing All-to-All.");
 }

References ASSERTL0, and m_comm.

◆ v_AlltoAllv()

void Nektar::LibUtilities::CommMpi::v_AlltoAllv	(	void *	sendbuf,
		int	sendcounts[],
		int	sensdispls[],
		CommDataType	sendtype,
		void *	recvbuf,
		int	recvcounts[],
		int	rdispls[],
		CommDataType	recvtype
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 281 of file CommMpi.cpp.

 {
     int retval = MPI_Alltoallv(sendbuf, sendcounts, sdispls, sendtype, recvbuf,
                                recvcounts, rdispls, recvtype, m_comm);
  
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing All-to-All-v.");
 }

References ASSERTL0, and m_comm.

◆ v_Bcast()

void Nektar::LibUtilities::CommMpi::v_Bcast	(	void *	buffer,
		int	count,
		CommDataType	dt,
		int	root
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 323 of file CommMpi.cpp.

 {
     int retval = MPI_Bcast(buffer, count, dt, root, m_comm);
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing Bcast-v.");
 }

References ASSERTL0, and m_comm.

◆ v_Block()

void Nektar::LibUtilities::CommMpi::v_Block ( )

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 169 of file CommMpi.cpp.

 {
     MPI_Barrier(m_comm);
 }

References m_comm.

◆ v_CommCreateIf()

CommSharedPtr Nektar::LibUtilities::CommMpi::v_CommCreateIf ( int flag )

finaloverrideprotectedvirtual

Create a new communicator if the flag is non-zero.

Implements Nektar::LibUtilities::Comm.

Definition at line 546 of file CommMpi.cpp.

 {
     MPI_Comm newComm;
     // color == MPI_UNDEF => not in the new communicator
     // key == 0 on all => use rank to order them. OpenMPI, at least,
     // implies this is faster than ordering them ourselves.
     MPI_Comm_split(m_comm, flag ? flag : MPI_UNDEFINED, 0, &newComm);
  
     if (flag == 0)
     {
         // flag == 0 => get back MPI_COMM_NULL, return a null ptr instead.
         return std::shared_ptr<Comm>();
     }
     else
     {
         // Return a real communicator
         return std::shared_ptr<Comm>(new CommMpi(newComm));
     }
 }

References CommMpi(), and m_comm.

Referenced by v_SplitCommNode().

◆ v_CreateRequest()

CommRequestSharedPtr Nektar::LibUtilities::CommMpi::v_CreateRequest ( int num )

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 472 of file CommMpi.cpp.

 {
     return std::shared_ptr<CommRequest>(new CommRequestMpi(num));
 }

◆ v_DistGraphCreateAdjacent()

void Nektar::LibUtilities::CommMpi::v_DistGraphCreateAdjacent	(	int	indegree,
		const int	sources[],
		const int	sourceweights[],
		int	reorder
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 375 of file CommMpi.cpp.

 {
 #if MPI_VERSION < 3
     boost::ignore_unused(indegree, sources, sourceweights, reorder);
     ASSERTL0(false, "MPI_Dist_graph_create_adjacent is not supported in your "
                     "installed MPI version.");
 #else
     int retval = MPI_Dist_graph_create_adjacent(
         m_comm, indegree, sources, sourceweights, indegree, sources,
         sourceweights, MPI_INFO_NULL, reorder, &m_comm);
  
     ASSERTL0(retval == MPI_SUCCESS,
              "MPI error performing Dist_graph_create_adjacent.")
 #endif
 }

References ASSERTL0, and m_comm.

◆ v_Exscan()

void Nektar::LibUtilities::CommMpi::v_Exscan	(	Array< OneD, unsigned long long > &	pData,
		enum ReduceOperator	pOp,
		Array< OneD, unsigned long long > &	ans
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 329 of file CommMpi.cpp.

 {
     int n = pData.size();
     ASSERTL0(n == ans.size(), "Array sizes differ in Exscan");
  
     MPI_Op vOp;
     switch (pOp)
     {
         case ReduceMax:
             vOp = MPI_MAX;
             break;
         case ReduceMin:
             vOp = MPI_MIN;
             break;
         case ReduceSum:
         default:
             vOp = MPI_SUM;
             break;
     }
  
     int retval = MPI_Exscan(pData.get(), ans.get(), n, MPI_UNSIGNED_LONG_LONG,
                             vOp, m_comm);
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing Exscan-v.");
 }

References ASSERTL0, m_comm, MPI_UNSIGNED_LONG_LONG, Nektar::LibUtilities::ReduceMax, Nektar::LibUtilities::ReduceMin, and Nektar::LibUtilities::ReduceSum.

◆ v_Finalise()

void Nektar::LibUtilities::CommMpi::v_Finalise ( )

overrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Reimplemented in Nektar::LibUtilities::CommCwipi.

Definition at line 119 of file CommMpi.cpp.

 {
 #ifdef NEKTAR_USING_PETSC
     PetscFinalize();
 #endif
     int flag;
     MPI_Finalized(&flag);
     if ((!flag) && m_controls_mpi)
     {
         MPI_Finalize();
     }
 }

References m_controls_mpi.

Referenced by Nektar::LibUtilities::CommCwipi::v_Finalise().

◆ v_Gather()

void Nektar::LibUtilities::CommMpi::v_Gather	(	void *	sendbuf,
		int	sendcount,
		CommDataType	sendtype,
		void *	recvbuf,
		int	recvcount,
		CommDataType	recvtype,
		int	root
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 356 of file CommMpi.cpp.

 {
     int retval = MPI_Gather(sendbuf, sendcount, sendtype, recvbuf, recvcount,
                             recvtype, root, m_comm);
  
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing Gather.");
 }

References ASSERTL0, and m_comm.

◆ v_GetRank()

int Nektar::LibUtilities::CommMpi::v_GetRank ( void )

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 135 of file CommMpi.cpp.

 {
     return m_rank;
 }

References m_rank.

◆ v_GetVersion()

std::tuple< int, int, int > Nektar::LibUtilities::CommMpi::v_GetVersion ( )

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 156 of file CommMpi.cpp.

 {
     int version, subversion;
     int retval = MPI_Get_version(&version, &subversion);
  
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing GetVersion.");
  
     return std::make_tuple(version, subversion, 0);
 }

References ASSERTL0.

◆ v_Irecv()

void Nektar::LibUtilities::CommMpi::v_Irecv	(	void *	buf,
		int	count,
		CommDataType	dt,
		int	source,
		CommRequestSharedPtr	request,
		int	loc
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 435 of file CommMpi.cpp.

 {
     CommRequestMpiSharedPtr req =
         std::static_pointer_cast<CommRequestMpi>(request);
     MPI_Irecv(buf, count, dt, source, 0, m_comm, req->GetRequest(loc));
 }

References CG_Iterations::loc, and m_comm.

◆ v_Irsend()

void Nektar::LibUtilities::CommMpi::v_Irsend	(	void *	buf,
		int	count,
		CommDataType	dt,
		int	dest,
		CommRequestSharedPtr	request,
		int	loc
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 411 of file CommMpi.cpp.

 {
     CommRequestMpiSharedPtr req =
         std::static_pointer_cast<CommRequestMpi>(request);
     MPI_Irsend(buf, count, dt, dest, 0, m_comm, req->GetRequest(loc));
 }

References CG_Iterations::loc, and m_comm.

◆ v_Isend()

void Nektar::LibUtilities::CommMpi::v_Isend	(	void *	buf,
		int	count,
		CommDataType	dt,
		int	dest,
		CommRequestSharedPtr	request,
		int	loc
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 419 of file CommMpi.cpp.

 {
     CommRequestMpiSharedPtr req =
         std::static_pointer_cast<CommRequestMpi>(request);
     MPI_Isend(buf, count, dt, dest, 0, m_comm, req->GetRequest(loc));
 }

References CG_Iterations::loc, and m_comm.

◆ v_IsSerial()

bool Nektar::LibUtilities::CommMpi::v_IsSerial ( void )

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 151 of file CommMpi.cpp.

 {
     return m_size == 1;
 }

References Nektar::LibUtilities::Comm::m_size.

◆ v_NeighborAlltoAllv()

void Nektar::LibUtilities::CommMpi::v_NeighborAlltoAllv	(	void *	sendbuf,
		int	sendcounts[],
		int	sensdispls[],
		CommDataType	sendtype,
		void *	recvbuf,
		int	recvcounts[],
		int	rdispls[],
		CommDataType	recvtype
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 392 of file CommMpi.cpp.

 {
 #if MPI_VERSION < 3
     boost::ignore_unused(sendbuf, sendcounts, sdispls, sendtype, recvbuf,
                          recvcounts, rdispls, recvtype);
     ASSERTL0(false, "MPI_Neighbor_alltoallv is not supported in your "
                     "installed MPI version.");
 #else
     int retval =
         MPI_Neighbor_alltoallv(sendbuf, sendcounts, sdispls, sendtype, recvbuf,
                                recvcounts, rdispls, recvtype, m_comm);
  
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing NeighborAllToAllV.");
 #endif
 }

References ASSERTL0, and m_comm.

◆ v_Recv()

void Nektar::LibUtilities::CommMpi::v_Recv	(	void *	buf,
		int	count,
		CommDataType	dt,
		int	source
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 200 of file CommMpi.cpp.

 {
     MPI_Recv(buf, count, dt, source, 0, m_comm, MPI_STATUS_IGNORE);
     // ASSERTL0(status.MPI_ERROR == MPI_SUCCESS,
     //         "MPI error receiving data.");
 }

References m_comm.

◆ v_RecvInit()

void Nektar::LibUtilities::CommMpi::v_RecvInit	(	void *	buf,
		int	count,
		CommDataType	dt,
		int	source,
		CommRequestSharedPtr	request,
		int	loc
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 443 of file CommMpi.cpp.

 {
     CommRequestMpiSharedPtr req =
         std::static_pointer_cast<CommRequestMpi>(request);
     MPI_Recv_init(buf, count, dt, source, 0, m_comm, req->GetRequest(loc));
 }

References CG_Iterations::loc, and m_comm.

◆ v_Scatter()

void Nektar::LibUtilities::CommMpi::v_Scatter	(	void *	sendbuf,
		int	sendcount,
		CommDataType	sendtype,
		void *	recvbuf,
		int	recvcount,
		CommDataType	recvtype,
		int	root
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 366 of file CommMpi.cpp.

 {
     int retval = MPI_Scatter(sendbuf, sendcount, sendtype, recvbuf, recvcount,
                              recvtype, root, m_comm);
     ASSERTL0(retval == MPI_SUCCESS, "MPI error performing Scatter.");
 }

References ASSERTL0, and m_comm.

◆ v_Send()

void Nektar::LibUtilities::CommMpi::v_Send	(	void *	buf,
		int	count,
		CommDataType	dt,
		int	dest
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 185 of file CommMpi.cpp.

 {
     if (MPISYNC)
     {
         MPI_Ssend(buf, count, dt, dest, 0, m_comm);
     }
     else
     {
         MPI_Send(buf, count, dt, dest, 0, m_comm);
     }
 }

References m_comm, and MPISYNC.

◆ v_SendInit()

void Nektar::LibUtilities::CommMpi::v_SendInit	(	void *	buf,
		int	count,
		CommDataType	dt,
		int	dest,
		CommRequestSharedPtr	request,
		int	loc
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 427 of file CommMpi.cpp.

 {
     CommRequestMpiSharedPtr req =
         std::static_pointer_cast<CommRequestMpi>(request);
     MPI_Send_init(buf, count, dt, dest, 0, m_comm, req->GetRequest(loc));
 }

References CG_Iterations::loc, and m_comm.

◆ v_SendRecv()

void Nektar::LibUtilities::CommMpi::v_SendRecv	(	void *	sendbuf,
		int	sendcount,
		CommDataType	sendtype,
		int	dest,
		void *	recvbuf,
		int	recvcount,
		CommDataType	recvtype,
		int	source
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 210 of file CommMpi.cpp.

 {
     MPI_Status status;
     int retval = MPI_Sendrecv(sendbuf, sendcount, sendtype, dest, 0, recvbuf,
                               recvcount, recvtype, source, 0, m_comm, &status);
  
     ASSERTL0(retval == MPI_SUCCESS,
              "MPI error performing send-receive of data.");
 }

References ASSERTL0, and m_comm.

◆ v_SendRecvReplace()

void Nektar::LibUtilities::CommMpi::v_SendRecvReplace	(	void *	buf,
		int	count,
		CommDataType	dt,
		int	pSendProc,
		int	pRecvProc
	)

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 225 of file CommMpi.cpp.

 {
     MPI_Status status;
     int retval = MPI_Sendrecv_replace(buf, count, dt, pRecvProc, 0, pSendProc,
                                       0, m_comm, &status);
  
     ASSERTL0(retval == MPI_SUCCESS,
              "MPI error performing Send-Receive-Replace of data.");
 }

References ASSERTL0, and m_comm.

◆ v_SplitComm()

void Nektar::LibUtilities::CommMpi::v_SplitComm	(	int	pRows,
		int	pColumns,
		int	pTime
	)

overrideprotectedvirtual

Processes are considered as a grid of size pRows*pColumns. Comm objects are created corresponding to the rows and columns of this grid. The row and column to which this process belongs is stored in m_commRow and m_commColumn.

Implements Nektar::LibUtilities::Comm.

Definition at line 483 of file CommMpi.cpp.

 {
     ASSERTL0(pRows * pColumns * pTime == m_size,
              "Rows/Columns do not match comm size.");
  
     MPI_Comm newComm;
     MPI_Comm gridComm;
     if (pTime == 1)
     {
         // There is a bug in OpenMPI 3.1.3. This bug cause some cases to fail in
         // buster-full-build-and-test. Failed cases are:
         //
         // IncNavierStokesSolver_ChanFlow_3DH1D_FlowrateExplicit_MVM_par
         // IncNavierStokesSolver_ChanFlow_3DH1D_FlowrateExplicit_MVM_par_hybrid
  
         // See: https://github.com/open-mpi/ompi/issues/6522
  
         // Compute row and column in grid.
         int myCol = m_rank % pColumns;
         int myRow = (m_rank - myCol) / pColumns;
  
         // Split Comm into rows - all processes with same myRow are put in
         // the same communicator. The rank within this communicator is the
         // column index.
         MPI_Comm_split(m_comm, myRow, myCol, &newComm);
         m_commRow = std::shared_ptr<Comm>(new CommMpi(newComm));
  
         // Split Comm into columns - all processes with same myCol are put
         // in the same communicator. The rank within this communicator is
         // the row index.
         MPI_Comm_split(m_comm, myCol, myRow, &newComm);
         m_commColumn = std::shared_ptr<Comm>(new CommMpi(newComm));
     }
     else
     {
         constexpr int dims      = 3;
         const int sizes[dims]   = {pRows, pColumns, pTime};
         const int periods[dims] = {0, 0, 0};
         constexpr int reorder   = 1;
  
         MPI_Cart_create(m_comm, dims, sizes, periods, reorder, &gridComm);
  
         constexpr int keepRow[dims] = {0, 1, 0};
         MPI_Cart_sub(gridComm, keepRow, &newComm);
         m_commRow = std::shared_ptr<Comm>(new CommMpi(newComm));
  
         constexpr int keepCol[dims] = {1, 0, 0};
         MPI_Cart_sub(gridComm, keepCol, &newComm);
         m_commColumn = std::shared_ptr<Comm>(new CommMpi(newComm));
  
         constexpr int keepTime[dims] = {0, 0, 1};
         MPI_Cart_sub(gridComm, keepTime, &newComm);
         m_commTime = std::shared_ptr<Comm>(new CommMpi(newComm));
  
         constexpr int keepSpace[dims] = {1, 1, 0};
         MPI_Cart_sub(gridComm, keepSpace, &newComm);
         m_commSpace = std::shared_ptr<Comm>(new CommMpi(newComm));
     }
 }

References ASSERTL0, CommMpi(), m_comm, Nektar::LibUtilities::Comm::m_commColumn, Nektar::LibUtilities::Comm::m_commRow, Nektar::LibUtilities::Comm::m_commSpace, Nektar::LibUtilities::Comm::m_commTime, m_rank, and Nektar::LibUtilities::Comm::m_size.

◆ v_SplitCommNode()

std::pair< CommSharedPtr, CommSharedPtr > Nektar::LibUtilities::CommMpi::v_SplitCommNode ( )

finaloverrideprotectedvirtual

Reimplemented from Nektar::LibUtilities::Comm.

Definition at line 566 of file CommMpi.cpp.

 {
     std::pair<CommSharedPtr, CommSharedPtr> ret;
  
 #if MPI_VERSION < 3
     ASSERTL0(false, "Not implemented for non-MPI-3 versions.");
 #else
     // Create an intra-node communicator.
     MPI_Comm nodeComm;
     MPI_Comm_split_type(MPI_COMM_WORLD, MPI_COMM_TYPE_SHARED, m_rank,
                         MPI_INFO_NULL, &nodeComm);
  
     // For rank 0 of the intra-node communicator, split the main
     // communicator. Everyone else will get a null communicator.
     ret.first  = std::shared_ptr<Comm>(new CommMpi(nodeComm));
     ret.second = CommMpi::v_CommCreateIf(ret.first->GetRank() == 0);
     if (ret.first->GetRank() == 0)
     {
         ret.second->SplitComm(1, ret.second->GetSize());
     }
 #endif
  
     return ret;
 }

References ASSERTL0, CommMpi(), m_rank, and v_CommCreateIf().

◆ v_StartAll()

void Nektar::LibUtilities::CommMpi::v_StartAll ( CommRequestSharedPtr request )

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 451 of file CommMpi.cpp.

 {
     CommRequestMpiSharedPtr req =
         std::static_pointer_cast<CommRequestMpi>(request);
     if (req->GetNumRequest() != 0)
     {
         MPI_Startall(req->GetNumRequest(), req->GetRequest(0));
     }
 }

◆ v_TreatAsRankZero()

bool Nektar::LibUtilities::CommMpi::v_TreatAsRankZero ( void )

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 143 of file CommMpi.cpp.

 {
     return m_rank == 0;
 }

References m_rank.

◆ v_WaitAll()

void Nektar::LibUtilities::CommMpi::v_WaitAll ( CommRequestSharedPtr request )

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 461 of file CommMpi.cpp.

 {
     CommRequestMpiSharedPtr req =
         std::static_pointer_cast<CommRequestMpi>(request);
     if (req->GetNumRequest() != 0)
     {
         MPI_Waitall(req->GetNumRequest(), req->GetRequest(0),
                     MPI_STATUSES_IGNORE);
     }
 }

◆ v_Wtime()

double Nektar::LibUtilities::CommMpi::v_Wtime ( )

finaloverrideprotectedvirtual

Implements Nektar::LibUtilities::Comm.

Definition at line 177 of file CommMpi.cpp.

 {
     return MPI_Wtime();
 }

Member Data Documentation

◆ className

std::string Nektar::LibUtilities::CommMpi::className

static

Initial value:

= GetCommFactory().RegisterCreatorFunction(

"ParallelMPI", CommMpi::create, "Parallel communication using MPI.")

Nektar::LibUtilities::CommMpi::create

static CommSharedPtr create(int narg, char *arg[])

Creates an instance of this class.

Definition: CommMpi.h:95

Nektar::LibUtilities::NekFactory::RegisterCreatorFunction

tKey RegisterCreatorFunction(tKey idKey, CreatorFunction classCreator, std::string pDesc="")

Register a class with the factory.

Definition: NekFactory.hpp:198

Nektar::LibUtilities::GetCommFactory

CommFactory & GetCommFactory()

Definition: Communication/Comm.cpp:67

Name of class.

Definition at line 101 of file CommMpi.h.

◆ m_comm

MPI_Comm Nektar::LibUtilities::CommMpi::m_comm

protected

Definition at line 109 of file CommMpi.h.

Referenced by Nektar::LibUtilities::CommCwipi::CommCwipi(), CommMpi(), GetComm(), v_AllGather(), v_AllGatherv(), v_AllReduce(), v_AlltoAll(), v_AlltoAllv(), v_Bcast(), v_Block(), v_CommCreateIf(), v_DistGraphCreateAdjacent(), v_Exscan(), v_Gather(), v_Irecv(), v_Irsend(), v_Isend(), v_NeighborAlltoAllv(), v_Recv(), v_RecvInit(), v_Scatter(), v_Send(), v_SendInit(), v_SendRecv(), v_SendRecvReplace(), v_SplitComm(), and ~CommMpi().

◆ m_controls_mpi

bool Nektar::LibUtilities::CommMpi::m_controls_mpi

protected

Definition at line 111 of file CommMpi.h.

Referenced by CommMpi(), and v_Finalise().

◆ m_rank

int Nektar::LibUtilities::CommMpi::m_rank {}

protected

Definition at line 110 of file CommMpi.h.

Referenced by Nektar::LibUtilities::CommCwipi::CommCwipi(), CommMpi(), v_GetRank(), v_SplitComm(), v_SplitCommNode(), and v_TreatAsRankZero().

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ CommMpi() [1/2]

◆ ~CommMpi()

◆ CommMpi() [2/2]

Member Function Documentation

◆ create()

◆ GetComm()

◆ v_AllGather()

◆ v_AllGatherv() [1/2]

◆ v_AllGatherv() [2/2]

◆ v_AllReduce()

◆ v_AlltoAll()

◆ v_AlltoAllv()

◆ v_Bcast()

◆ v_Block()

◆ v_CommCreateIf()

◆ v_CreateRequest()

◆ v_DistGraphCreateAdjacent()

◆ v_Exscan()

◆ v_Finalise()

◆ v_Gather()

◆ v_GetRank()

◆ v_GetVersion()

◆ v_Irecv()

◆ v_Irsend()

◆ v_Isend()

◆ v_IsSerial()

◆ v_NeighborAlltoAllv()

◆ v_Recv()

◆ v_RecvInit()

◆ v_Scatter()

◆ v_Send()

◆ v_SendInit()

◆ v_SendRecv()

◆ v_SendRecvReplace()

◆ v_SplitComm()

◆ v_SplitCommNode()

◆ v_StartAll()

◆ v_TreatAsRankZero()

◆ v_WaitAll()

◆ v_Wtime()

Member Data Documentation

◆ className

◆ m_comm

◆ m_controls_mpi

◆ m_rank