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Copy pathmpi.cpp
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964 lines (759 loc) · 33.9 KB
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// ***********************************************************************************
// Idefix MHD astrophysical code
// Copyright(C) Geoffroy R. J. Lesur <geoffroy.lesur@univ-grenoble-alpes.fr>
// and other code contributors
// Licensed under CeCILL 2.1 License, see COPYING for more information
// ***********************************************************************************
#include "mpi.hpp"
#include <signal.h>
#include <string>
#include <chrono> // NOLINT [build/c++11]
#include <thread> // NOLINT [build/c++11]
#include <utility>
#include "idefix.hpp"
#include "dataBlock.hpp"
#if defined(OPEN_MPI) && OPEN_MPI
#include "mpi-ext.h" // Needed for CUDA-aware check */
#endif
//#define MPI_NON_BLOCKING
#define MPI_PERSISTENT
// init the number of instances
int Mpi::nInstances = 0;
// MPI Routines exchange
void Mpi::ExchangeAll() {
IDEFIX_ERROR("Not Implemented");
}
///
/// Initialise an instance of the MPI class.
/// @param grid: pointer to the grid object (needed to get the MPI neighbours)
/// @param inputMap: 1st indices of inputVc which are to be exchanged (i.e, the list of variables)
/// @param nghost: size of the ghost region in each direction
/// @param nint: size of the internal region in each direction
/// @param inputHaveVs: whether the instance should also treat face-centered variable
/// (optional, default false)
///
void Mpi::Init(Grid *grid, std::vector<int> inputMap,
int nghost[3], int nint[3],
bool inputHaveVs) {
idfx::pushRegion("Mpi::Init");
this->mygrid = grid;
// increase the number of instances
nInstances++;
thisInstance=nInstances;
// Transfer the vector of indices as an IdefixArray on the target
// Allocate mapVars on target and copy it from the input argument list
this->mapVars = idfx::ConvertVectorToIdefixArray(inputMap);
this->mapNVars = inputMap.size();
this->haveVs = inputHaveVs;
// Compute indices of arrays we will be working with
for(int dir = 0 ; dir < 3 ; dir++) {
this->nghost[dir] = nghost[dir];
this->nint[dir] = nint[dir];
this->ntot[dir] = nint[dir]+2*nghost[dir];
this->beg[dir] = nghost[dir];
this->end[dir] = nghost[dir]+nint[dir];
}
/////////////////////////////////////////////////////////////////////////////
// Init exchange datasets
bufferSizeX1 = 0;
bufferSizeX2 = 0;
bufferSizeX3 = 0;
// Number of cells in X1 boundary condition:
bufferSizeX1 = nghost[IDIR] * nint[JDIR] * nint[KDIR] * mapNVars;
if(haveVs) {
bufferSizeX1 += nghost[IDIR] * nint[JDIR] * nint[KDIR];
#if DIMENSIONS>=2
bufferSizeX1 += nghost[IDIR] * (nint[JDIR]+1) * nint[KDIR];
#endif
#if DIMENSIONS==3
bufferSizeX1 += nghost[IDIR] * nint[JDIR] * (nint[KDIR]+1);
#endif // DIMENSIONS
}
BufferRecvX1[faceLeft ] = Buffer(bufferSizeX1);
BufferRecvX1[faceRight] = Buffer(bufferSizeX1);
BufferSendX1[faceLeft ] = Buffer(bufferSizeX1);
BufferSendX1[faceRight] = Buffer(bufferSizeX1);
// Number of cells in X2 boundary condition (only required when problem >2D):
#if DIMENSIONS >= 2
bufferSizeX2 = ntot[IDIR] * nghost[JDIR] * nint[KDIR] * mapNVars;
if(haveVs) {
// IDIR
bufferSizeX2 += (ntot[IDIR]+1) * nghost[JDIR] * nint[KDIR];
#if DIMENSIONS>=2
bufferSizeX2 += ntot[IDIR] * nghost[JDIR] * nint[KDIR];
#endif
#if DIMENSIONS==3
bufferSizeX2 += ntot[IDIR] * nghost[JDIR] * (nint[KDIR]+1);
#endif // DIMENSIONS
}
BufferRecvX2[faceLeft ] = Buffer(bufferSizeX2);
BufferRecvX2[faceRight] = Buffer(bufferSizeX2);
BufferSendX2[faceLeft ] = Buffer(bufferSizeX2);
BufferSendX2[faceRight] = Buffer(bufferSizeX2);
#endif
// Number of cells in X3 boundary condition (only required when problem is 3D):
#if DIMENSIONS ==3
bufferSizeX3 = ntot[IDIR] * ntot[JDIR] * nghost[KDIR] * mapNVars;
if(haveVs) {
// IDIR
bufferSizeX3 += (ntot[IDIR]+1) * ntot[JDIR] * nghost[KDIR];
// JDIR
bufferSizeX3 += ntot[IDIR] * (ntot[JDIR]+1) * nghost[KDIR];
// KDIR
bufferSizeX3 += ntot[IDIR] * ntot[JDIR] * nghost[KDIR];
}
BufferRecvX3[faceLeft ] = Buffer(bufferSizeX3);
BufferRecvX3[faceRight] = Buffer(bufferSizeX3);
BufferSendX3[faceLeft ] = Buffer(bufferSizeX3);
BufferSendX3[faceRight] = Buffer(bufferSizeX3);
#endif // DIMENSIONS
#ifdef MPI_PERSISTENT
// Init persistent MPI communications
int procSend, procRecv;
// X1-dir exchanges
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,0,1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Send_init(BufferSendX1[faceRight].data(), bufferSizeX1, realMPI, procSend,
thisInstance*1000, mygrid->CartComm, &sendRequestX1[faceRight]));
MPI_SAFE_CALL(MPI_Recv_init(BufferRecvX1[faceLeft].data(), bufferSizeX1, realMPI, procRecv,
thisInstance*1000, mygrid->CartComm, &recvRequestX1[faceLeft]));
// Send to the left
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,0,-1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Send_init(BufferSendX1[faceLeft].data(), bufferSizeX1, realMPI, procSend,
thisInstance*1000+1,mygrid->CartComm, &sendRequestX1[faceLeft]));
MPI_SAFE_CALL(MPI_Recv_init(BufferRecvX1[faceRight].data(), bufferSizeX1, realMPI, procRecv,
thisInstance*1000+1,mygrid->CartComm, &recvRequestX1[faceRight]));
#if DIMENSIONS >= 2
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,1,1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Send_init(BufferSendX2[faceRight].data(), bufferSizeX2, realMPI, procSend,
thisInstance*1000+10, mygrid->CartComm, &sendRequestX2[faceRight]));
MPI_SAFE_CALL(MPI_Recv_init(BufferRecvX2[faceLeft].data(), bufferSizeX2, realMPI, procRecv,
thisInstance*1000+10, mygrid->CartComm, &recvRequestX2[faceLeft]));
// Send to the left
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,1,-1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Send_init(BufferSendX2[faceLeft].data(), bufferSizeX2, realMPI, procSend,
thisInstance*1000+11, mygrid->CartComm, &sendRequestX2[faceLeft]));
MPI_SAFE_CALL(MPI_Recv_init(BufferRecvX2[faceRight].data(), bufferSizeX2, realMPI, procRecv,
thisInstance*1000+11, mygrid->CartComm, &recvRequestX2[faceRight]));
#endif
#if DIMENSIONS == 3
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,2,1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Send_init(BufferSendX3[faceRight].data(), bufferSizeX3, realMPI, procSend,
thisInstance*1000+20, mygrid->CartComm, &sendRequestX3[faceRight]));
MPI_SAFE_CALL(MPI_Recv_init(BufferRecvX3[faceLeft].data(), bufferSizeX3, realMPI, procRecv,
thisInstance*1000+20, mygrid->CartComm, &recvRequestX3[faceLeft]));
// Send to the left
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,2,-1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Send_init(BufferSendX3[faceLeft].data(), bufferSizeX3, realMPI, procSend,
thisInstance*1000+21, mygrid->CartComm, &sendRequestX3[faceLeft]));
MPI_SAFE_CALL(MPI_Recv_init(BufferRecvX3[faceRight].data(), bufferSizeX3, realMPI, procRecv,
thisInstance*1000+21, mygrid->CartComm, &recvRequestX3[faceRight]));
#endif
#endif // MPI_Persistent
// say this instance is initialized.
isInitialized = true;
idfx::popRegion();
}
// Destructor (clean up persistent communication channels)
Mpi::~Mpi() {
idfx::pushRegion("Mpi::~Mpi");
if(isInitialized) {
// Properly clean up the mess
#ifdef MPI_PERSISTENT
idfx::cout << "Mpi(" << thisInstance
<< "): Cleaning up MPI persistent communication channels" << std::endl;
for(int i=0 ; i< 2; i++) {
MPI_Request_free( &sendRequestX1[i]);
MPI_Request_free( &recvRequestX1[i]);
#if DIMENSIONS >= 2
MPI_Request_free( &sendRequestX2[i]);
MPI_Request_free( &recvRequestX2[i]);
#endif
#if DIMENSIONS == 3
MPI_Request_free( &sendRequestX3[i]);
MPI_Request_free( &recvRequestX3[i]);
#endif
}
#endif
if(thisInstance==1) {
idfx::cout << "Mpi(" << thisInstance << "): measured throughput is "
<< bytesSentOrReceived/myTimer/1024.0/1024.0 << " MB/s" << std::endl;
idfx::cout << "Mpi(" << thisInstance << "): message sizes were " << std::endl;
idfx::cout << " X1: " << bufferSizeX1*sizeof(real)/1024.0/1024.0 << " MB" << std::endl;
idfx::cout << " X2: " << bufferSizeX2*sizeof(real)/1024.0/1024.0 << " MB" << std::endl;
idfx::cout << " X3: " << bufferSizeX3*sizeof(real)/1024.0/1024.0 << " MB" << std::endl;
}
isInitialized = false;
}
idfx::popRegion();
}
void Mpi::ExchangeX1(IdefixArray4D<real> Vc, IdefixArray4D<real> Vs) {
idfx::pushRegion("Mpi::ExchangeX1");
// Load the buffers with data
int ibeg,iend,jbeg,jend,kbeg,kend,offset,nx;
Buffer BufferLeft = BufferSendX1[faceLeft];
Buffer BufferRight = BufferSendX1[faceRight];
IdefixArray1D<int> map = this->mapVars;
// If MPI Persistent, start receiving even before the buffers are filled
myTimer -= MPI_Wtime();
double tStart = MPI_Wtime();
#ifdef MPI_PERSISTENT
MPI_Status sendStatus[2];
MPI_Status recvStatus[2];
MPI_SAFE_CALL(MPI_Startall(2, recvRequestX1));
idfx::mpiCallsTimer += MPI_Wtime() - tStart;
#endif
myTimer += MPI_Wtime();
// Coordinates of the ghost region which needs to be transfered
ibeg = 0;
iend = nghost[IDIR];
nx = nghost[IDIR]; // Number of points in x
offset = end[IDIR]; // Distance between beginning of left and right ghosts
jbeg = beg[JDIR];
jend = end[JDIR];
kbeg = beg[KDIR];
kend = end[KDIR];
BufferLeft.ResetPointer();
BufferRight.ResetPointer();
BufferLeft.Pack(Vc, map, std::make_pair(ibeg+nx, iend+nx),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
BufferRight.Pack(Vc, map, std::make_pair(ibeg+offset-nx, iend+offset-nx),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
// Load face-centered field in the buffer
if(haveVs) {
BufferLeft.Pack(Vs, BX1s,std::make_pair(ibeg+nx+1, iend+nx+1),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
BufferRight.Pack(Vs, BX1s, std::make_pair(ibeg+offset-nx, iend+offset-nx),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
#if DIMENSIONS >= 2
BufferLeft.Pack(Vs, BX2s,std::make_pair(ibeg+nx, iend+nx),
std::make_pair(jbeg , jend+1),
std::make_pair(kbeg , kend));
BufferRight.Pack(Vs, BX2s, std::make_pair(ibeg+offset-nx, iend+offset-nx),
std::make_pair(jbeg , jend+1),
std::make_pair(kbeg , kend));
#endif
#if DIMENSIONS == 3
BufferLeft.Pack(Vs, BX3s,std::make_pair(ibeg+nx, iend+nx),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend+1));
BufferRight.Pack(Vs, BX3s, std::make_pair(ibeg+offset-nx, iend+offset-nx),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend+1));
#endif
}
// Wait for completion before sending out everything
Kokkos::fence();
myTimer -= MPI_Wtime();
tStart = MPI_Wtime();
#ifdef MPI_PERSISTENT
MPI_SAFE_CALL(MPI_Startall(2, sendRequestX1));
// Wait for buffers to be received
MPI_Waitall(2,recvRequestX1,recvStatus);
#else
int procSend, procRecv;
#ifdef MPI_NON_BLOCKING
MPI_Status sendStatus[2];
MPI_Status recvStatus[2];
MPI_Request sendRequest[2];
MPI_Request recvRequest[2];
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,0,1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Isend(BufferSendX1[faceRight].data(), bufferSizeX1, realMPI, procSend, 100,
mygrid->CartComm, &sendRequest[0]));
MPI_SAFE_CALL(MPI_Irecv(BufferRecvX1[faceLeft].data(), bufferSizeX1, realMPI, procRecv, 100,
mygrid->CartComm, &recvRequest[0]));
// Send to the left
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,0,-1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Isend(BufferSendX1[faceLeft].data(), bufferSizeX1, realMPI, procSend, 101,
mygrid->CartComm, &sendRequest[1]));
MPI_SAFE_CALL(MPI_Irecv(BufferRecvX1[faceRight].data(), bufferSizeX1, realMPI, procRecv, 101,
mygrid->CartComm, &recvRequest[1]));
// Wait for recv to complete (we don't care about the sends)
MPI_Waitall(2, recvRequest, recvStatus);
#else
MPI_Status status;
// Send to the right
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,0,1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Sendrecv(BufferSendX1[faceRight].data(), bufferSizeX1, realMPI, procSend, 100,
BufferRecvX1[faceLeft].data(), bufferSizeX1, realMPI, procRecv, 100,
mygrid->CartComm, &status));
// Send to the left
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,0,-1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Sendrecv(BufferSendX1[faceLeft].data(), bufferSizeX1, realMPI, procSend, 101,
BufferRecvX1[faceRight].data(), bufferSizeX1, realMPI, procRecv, 101,
mygrid->CartComm, &status));
#endif
#endif
myTimer += MPI_Wtime();
idfx::mpiCallsTimer += MPI_Wtime() - tStart;
// Unpack
BufferLeft=BufferRecvX1[faceLeft];
BufferRight=BufferRecvX1[faceRight];
BufferLeft.ResetPointer();
BufferRight.ResetPointer();
BufferLeft.Unpack(Vc, map,std::make_pair(ibeg, iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
BufferRight.Unpack(Vc, map,std::make_pair(ibeg+offset, iend+offset),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
// We fill the ghost zones
if(haveVs) {
BufferLeft.Unpack(Vs, BX1s, std::make_pair(ibeg, iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
BufferRight.Unpack(Vs, BX1s, std::make_pair(ibeg+offset+1, iend+offset+1),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
#if DIMENSIONS >= 2
BufferLeft.Unpack(Vs, BX2s, std::make_pair(ibeg, iend),
std::make_pair(jbeg , jend+1),
std::make_pair(kbeg , kend));
BufferRight.Unpack(Vs, BX2s, std::make_pair(ibeg+offset, iend+offset),
std::make_pair(jbeg , jend+1),
std::make_pair(kbeg , kend));
#endif
#if DIMENSIONS == 3
BufferLeft.Unpack(Vs, BX3s, std::make_pair(ibeg, iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend+1));
BufferRight.Unpack(Vs, BX3s, std::make_pair(ibeg+offset, iend+offset),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend+1));
#endif
}
myTimer -= MPI_Wtime();
#ifdef MPI_NON_BLOCKING
// Wait for the sends if they have not yet completed
MPI_Waitall(2, sendRequest, sendStatus);
#endif
#ifdef MPI_PERSISTENT
MPI_Waitall(2, sendRequestX1, sendStatus);
#endif
myTimer += MPI_Wtime();
bytesSentOrReceived += 4*bufferSizeX1*sizeof(real);
idfx::popRegion();
}
void Mpi::ExchangeX2(IdefixArray4D<real> Vc, IdefixArray4D<real> Vs) {
idfx::pushRegion("Mpi::ExchangeX2");
// Load the buffers with data
int ibeg,iend,jbeg,jend,kbeg,kend,offset,ny;
Buffer BufferLeft=BufferSendX2[faceLeft];
Buffer BufferRight=BufferSendX2[faceRight];
IdefixArray1D<int> map = this->mapVars;
// If MPI Persistent, start receiving even before the buffers are filled
myTimer -= MPI_Wtime();
double tStart = MPI_Wtime();
#ifdef MPI_PERSISTENT
MPI_Status sendStatus[2];
MPI_Status recvStatus[2];
MPI_SAFE_CALL(MPI_Startall(2, recvRequestX2));
idfx::mpiCallsTimer += MPI_Wtime() - tStart;
#endif
myTimer += MPI_Wtime();
// Coordinates of the ghost region which needs to be transfered
ibeg = 0;
iend = ntot[IDIR];
jbeg = 0;
jend = nghost[JDIR];
offset = end[JDIR]; // Distance between beginning of left and right ghosts
ny = nghost[JDIR];
kbeg = beg[KDIR];
kend = end[KDIR];
BufferLeft.ResetPointer();
BufferRight.ResetPointer();
BufferLeft.Pack(Vc, map, std::make_pair(ibeg , iend),
std::make_pair(jbeg+ny , jend+ny),
std::make_pair(kbeg , kend));
BufferRight.Pack(Vc, map, std::make_pair(ibeg , iend),
std::make_pair(jbeg+offset-ny , jend+offset-ny),
std::make_pair(kbeg , kend));
// Load face-centered field in the buffer
if(haveVs) {
BufferLeft.Pack(Vs, BX1s,std::make_pair(ibeg , iend+1),
std::make_pair(jbeg+ny , jend+ny),
std::make_pair(kbeg , kend));
BufferRight.Pack(Vs, BX1s, std::make_pair(ibeg , iend+1),
std::make_pair(jbeg+offset-ny , jend+offset-ny),
std::make_pair(kbeg , kend));
#if DIMENSIONS >= 2
BufferLeft.Pack(Vs, BX2s,std::make_pair(ibeg , iend),
std::make_pair(jbeg+ny+1 , jend+ny+1),
std::make_pair(kbeg , kend));
BufferRight.Pack(Vs, BX2s, std::make_pair(ibeg , iend),
std::make_pair(jbeg+offset-ny , jend+offset-ny),
std::make_pair(kbeg , kend));
#endif
#if DIMENSIONS == 3
BufferLeft.Pack(Vs, BX3s,std::make_pair(ibeg , iend),
std::make_pair(jbeg+ny , jend+ny),
std::make_pair(kbeg , kend+1));
BufferRight.Pack(Vs, BX3s, std::make_pair(ibeg , iend),
std::make_pair(jbeg+offset-ny , jend+offset-ny),
std::make_pair(kbeg , kend+1));
#endif
}
// Send to the right
Kokkos::fence();
myTimer -= MPI_Wtime();
tStart = MPI_Wtime();
#ifdef MPI_PERSISTENT
MPI_SAFE_CALL(MPI_Startall(2, sendRequestX2));
MPI_Waitall(2,recvRequestX2,recvStatus);
#else
int procSend, procRecv;
#ifdef MPI_NON_BLOCKING
MPI_Status sendStatus[2];
MPI_Status recvStatus[2];
MPI_Request sendRequest[2];
MPI_Request recvRequest[2];
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,1,1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Isend(BufferSendX2[faceRight].data(), bufferSizeX2, realMPI, procSend, 100,
mygrid->CartComm, &sendRequest[0]));
MPI_SAFE_CALL(MPI_Irecv(BufferRecvX2[faceLeft].data(), bufferSizeX2, realMPI, procRecv, 100,
mygrid->CartComm, &recvRequest[0]));
// Send to the left
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,1,-1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Isend(BufferSendX2[faceLeft].data(), bufferSizeX2, realMPI, procSend, 101,
mygrid->CartComm, &sendRequest[1]));
MPI_SAFE_CALL(MPI_Irecv(BufferRecvX2[faceRight].data(), bufferSizeX2, realMPI, procRecv, 101,
mygrid->CartComm, &recvRequest[1]));
// Wait for recv to complete (we don't care about the sends)
MPI_Waitall(2, recvRequest, recvStatus);
#else
MPI_Status status;
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,1,1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Sendrecv(BufferSendX2[faceRight].data(), bufferSizeX2, realMPI, procSend, 200,
BufferRecvX2[faceLeft].data(), bufferSizeX2, realMPI, procRecv, 200,
mygrid->CartComm, &status));
// Send to the left
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,1,-1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Sendrecv(BufferSendX2[faceLeft].data(), bufferSizeX2, realMPI, procSend, 201,
BufferRecvX2[faceRight].data(), bufferSizeX2, realMPI, procRecv, 201,
mygrid->CartComm, &status));
#endif
#endif
myTimer += MPI_Wtime();
idfx::mpiCallsTimer += MPI_Wtime() - tStart;
// Unpack
BufferLeft=BufferRecvX2[faceLeft];
BufferRight=BufferRecvX2[faceRight];
BufferLeft.ResetPointer();
BufferRight.ResetPointer();
// We fill the ghost zones
BufferLeft.Unpack(Vc, map,std::make_pair(ibeg, iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
BufferRight.Unpack(Vc, map,std::make_pair(ibeg , iend),
std::make_pair(jbeg+offset , jend+offset),
std::make_pair(kbeg , kend));
// We fill the ghost zones
if(haveVs) {
BufferLeft.Unpack(Vs, BX1s, std::make_pair(ibeg, iend+1),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
BufferRight.Unpack(Vs, BX1s, std::make_pair(ibeg, iend+1),
std::make_pair(jbeg+offset , jend+offset),
std::make_pair(kbeg , kend));
#if DIMENSIONS >= 2
BufferLeft.Unpack(Vs, BX2s, std::make_pair(ibeg, iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
BufferRight.Unpack(Vs, BX2s, std::make_pair(ibeg, iend),
std::make_pair(jbeg+offset+1, jend+offset+1),
std::make_pair(kbeg , kend));
#endif
#if DIMENSIONS == 3
BufferLeft.Unpack(Vs, BX3s, std::make_pair(ibeg, iend),
std::make_pair(jbeg, jend),
std::make_pair(kbeg, kend+1));
BufferRight.Unpack(Vs, BX3s,std::make_pair(ibeg , iend),
std::make_pair(jbeg+offset, jend+offset),
std::make_pair(kbeg , kend+1));
#endif
}
myTimer -= MPI_Wtime();
#ifdef MPI_NON_BLOCKING
// Wait for the sends if they have not yet completed
MPI_Waitall(2, sendRequest, sendStatus);
#endif
#ifdef MPI_PERSISTENT
MPI_Waitall(2, sendRequestX2, sendStatus);
#endif
myTimer += MPI_Wtime();
bytesSentOrReceived += 4*bufferSizeX2*sizeof(real);
idfx::popRegion();
}
void Mpi::ExchangeX3(IdefixArray4D<real> Vc, IdefixArray4D<real> Vs) {
idfx::pushRegion("Mpi::ExchangeX3");
// Load the buffers with data
int ibeg,iend,jbeg,jend,kbeg,kend,offset,nz;
Buffer BufferLeft=BufferSendX3[faceLeft];
Buffer BufferRight=BufferSendX3[faceRight];
IdefixArray1D<int> map = this->mapVars;
// If MPI Persistent, start receiving even before the buffers are filled
myTimer -= MPI_Wtime();
double tStart = MPI_Wtime();
#ifdef MPI_PERSISTENT
MPI_Status sendStatus[2];
MPI_Status recvStatus[2];
MPI_SAFE_CALL(MPI_Startall(2, recvRequestX3));
idfx::mpiCallsTimer += MPI_Wtime() - tStart;
#endif
myTimer += MPI_Wtime();
// Coordinates of the ghost region which needs to be transfered
ibeg = 0;
iend = ntot[IDIR];
jbeg = 0;
jend = ntot[JDIR];
kbeg = 0;
kend = nghost[KDIR];
offset = end[KDIR]; // Distance between beginning of left and right ghosts
nz = nghost[KDIR];
BufferLeft.ResetPointer();
BufferRight.ResetPointer();
BufferLeft.Pack(Vc, map, std::make_pair(ibeg , iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg+nz, kend+nz));
BufferRight.Pack(Vc, map, std::make_pair(ibeg , iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg + offset-nz, kend+ offset-nz));
// Load face-centered field in the buffer
if(haveVs) {
BufferLeft.Pack(Vs, BX1s,std::make_pair(ibeg , iend+1),
std::make_pair(jbeg , jend),
std::make_pair(kbeg+nz , kend+nz));
BufferRight.Pack(Vs, BX1s, std::make_pair(ibeg , iend+1),
std::make_pair(jbeg , jend),
std::make_pair(kbeg + offset-nz, kend+ offset-nz));
#if DIMENSIONS >= 2
BufferLeft.Pack(Vs, BX2s,std::make_pair(ibeg , iend),
std::make_pair(jbeg , jend+1),
std::make_pair(kbeg+nz , kend+nz));
BufferRight.Pack(Vs, BX2s, std::make_pair(ibeg , iend),
std::make_pair(jbeg , jend+1),
std::make_pair(kbeg + offset-nz, kend+ offset-nz));
#endif
#if DIMENSIONS == 3
BufferLeft.Pack(Vs, BX3s,std::make_pair(ibeg , iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg+nz+1 , kend+nz+1));
BufferRight.Pack(Vs, BX3s, std::make_pair(ibeg , iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg + offset-nz, kend+ offset-nz));
#endif
}
// Send to the right
Kokkos::fence();
myTimer -= MPI_Wtime();
tStart = MPI_Wtime();
#ifdef MPI_PERSISTENT
MPI_SAFE_CALL(MPI_Startall(2, sendRequestX3));
MPI_Waitall(2,recvRequestX3,recvStatus);
idfx::mpiCallsTimer += MPI_Wtime() - tStart;
#else
int procSend, procRecv;
#ifdef MPI_NON_BLOCKING
MPI_Status sendStatus[2];
MPI_Status recvStatus[2];
MPI_Request sendRequest[2];
MPI_Request recvRequest[2];
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,2,1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Isend(BufferSendX3[faceRight].data(), bufferSizeX3, realMPI, procSend, 100,
mygrid->CartComm, &sendRequest[0]));
MPI_SAFE_CALL(MPI_Irecv(BufferRecvX3[faceLeft].data(), bufferSizeX3, realMPI, procRecv, 100,
mygrid->CartComm, &recvRequest[0]));
// Send to the left
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,2,-1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Isend(BufferSendX3[faceLeft].data(), bufferSizeX3, realMPI, procSend, 101,
mygrid->CartComm, &sendRequest[1]));
MPI_SAFE_CALL(MPI_Irecv(BufferRecvX3[faceRight].data(), bufferSizeX3, realMPI, procRecv, 101,
mygrid->CartComm, &recvRequest[1]));
// Wait for recv to complete (we don't care about the sends)
MPI_Waitall(2, recvRequest, recvStatus);
#else
MPI_Status status;
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,2,1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Sendrecv(BufferSendX3[faceRight].data(), bufferSizeX3, realMPI, procSend, 300,
BufferRecvX3[faceLeft].data(), bufferSizeX3, realMPI, procRecv, 300,
mygrid->CartComm, &status));
// Send to the left
// We receive from procRecv, and we send to procSend
MPI_SAFE_CALL(MPI_Cart_shift(mygrid->CartComm,2,-1,&procRecv,&procSend ));
MPI_SAFE_CALL(MPI_Sendrecv(BufferSendX3[faceLeft].data(), bufferSizeX3, realMPI, procSend, 301,
BufferRecvX3[faceRight].data(), bufferSizeX3, realMPI, procRecv, 301,
mygrid->CartComm, &status));
#endif
#endif
myTimer += MPI_Wtime();
idfx::mpiCallsTimer += MPI_Wtime() - tStart;
// Unpack
BufferLeft=BufferRecvX3[faceLeft];
BufferRight=BufferRecvX3[faceRight];
BufferLeft.ResetPointer();
BufferRight.ResetPointer();
// We fill the ghost zones
BufferLeft.Unpack(Vc, map,std::make_pair(ibeg, iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
BufferRight.Unpack(Vc, map,std::make_pair(ibeg , iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg+offset , kend+offset));
// We fill the ghost zones
if(haveVs) {
BufferLeft.Unpack(Vs, BX1s, std::make_pair(ibeg, iend+1),
std::make_pair(jbeg , jend),
std::make_pair(kbeg , kend));
BufferRight.Unpack(Vs, BX1s, std::make_pair(ibeg, iend+1),
std::make_pair(jbeg , jend),
std::make_pair(kbeg+offset , kend+offset));
#if DIMENSIONS >=2
BufferLeft.Unpack(Vs, BX2s, std::make_pair(ibeg, iend),
std::make_pair(jbeg, jend+1),
std::make_pair(kbeg, kend));
BufferRight.Unpack(Vs, BX2s,std::make_pair(ibeg , iend),
std::make_pair(jbeg , jend+1),
std::make_pair(kbeg+offset, kend+offset));
#endif
#if DIMENSIONS == 3
BufferLeft.Unpack(Vs, BX3s, std::make_pair(ibeg, iend),
std::make_pair(jbeg, jend),
std::make_pair(kbeg, kend));
BufferRight.Unpack(Vs, BX3s,std::make_pair(ibeg , iend),
std::make_pair(jbeg , jend),
std::make_pair(kbeg+offset+1, kend+offset+1));
#endif
}
myTimer -= MPI_Wtime();
#ifdef MPI_NON_BLOCKING
// Wait for the sends if they have not yet completed
MPI_Waitall(2, sendRequest, sendStatus);
#endif
#ifdef MPI_PERSISTENT
MPI_Waitall(2, sendRequestX3, sendStatus);
#endif
myTimer += MPI_Wtime();
bytesSentOrReceived += 4*bufferSizeX3*sizeof(real);
idfx::popRegion();
}
void Mpi::CheckConfig() {
idfx::pushRegion("Mpi::CheckConfig");
// compile time check
#ifdef KOKKOS_ENABLE_CUDA
#if defined(MPIX_CUDA_AWARE_SUPPORT) && !MPIX_CUDA_AWARE_SUPPORT
#error Your MPI library is not CUDA Aware (check Idefix requirements).
#endif
#endif /* MPIX_CUDA_AWARE_SUPPORT */
// Run-time check that we can do a reduce on device arrays
IdefixArray1D<int64_t> src("MPIChecksrc",1);
IdefixArray1D<int64_t>::HostMirror srcHost = Kokkos::create_mirror_view(src);
srcHost(0) = idfx::prank;
Kokkos::deep_copy(src, srcHost);
IdefixArray1D<int64_t> dst("MPICheckdst",1);
IdefixArray1D<int64_t>::HostMirror dstHost = Kokkos::create_mirror_view(dst);
MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
// Capture segfaults
struct sigaction newHandler;
struct sigaction oldHandler;
memset(&newHandler, 0, sizeof(newHandler));
newHandler.sa_flags = SA_SIGINFO;
newHandler.sa_sigaction = Mpi::SigErrorHandler;
sigaction(SIGSEGV, &newHandler, &oldHandler);
try {
int ierr = MPI_Allreduce(src.data(), dst.data(), 1, MPI_INT64_T, MPI_SUM, MPI_COMM_WORLD);
if(ierr != 0) {
char MPImsg[MPI_MAX_ERROR_STRING];
int MPImsgLen;
MPI_Error_string(ierr, MPImsg, &MPImsgLen);
throw std::runtime_error(std::string(MPImsg, MPImsgLen));
}
} catch(std::exception &e) {
std::stringstream errmsg;
errmsg << "Your MPI library is unable to perform reductions on Idefix arrays.";
errmsg << std::endl;
#ifdef KOKKOS_ENABLE_CUDA
errmsg << "Check that your MPI library is CUDA aware." << std::endl;
#elif defined(KOKKOS_ENABLE_HIP)
errmsg << "Check that your MPI library is RocM aware." << std::endl;
#else
errmsg << "Check your MPI library configuration." << std::endl;
#endif
errmsg << "Error: " << e.what() << std::endl;
IDEFIX_ERROR(errmsg);
}
// Restore old handlers
sigaction(SIGSEGV, &oldHandler, NULL );
MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_ARE_FATAL);
// Check that we have the proper end result
Kokkos::deep_copy(dstHost, dst);
int64_t size = static_cast<int64_t>(idfx::psize);
if(dstHost(0) != size*(size-1)/2) {
std::stringstream errmsg;
errmsg << "Your MPI library managed to perform reduction on Idefix Arrays, but the result ";
errmsg << "is incorrect. " << std::endl;
errmsg << "Check your MPI library configuration." << std::endl;
IDEFIX_ERROR(errmsg);
}
idfx::popRegion();
}
void Mpi::SigErrorHandler(int nSignum, siginfo_t* si, void* vcontext) {
std::stringstream errmsg;
errmsg << "A segmentation fault was triggered while attempting to test your MPI library.";
errmsg << std::endl;
errmsg << "Your MPI library is unable to perform reductions on Idefix arrays.";
errmsg << std::endl;
#ifdef KOKKOS_ENABLE_CUDA
errmsg << "Check that your MPI library is CUDA aware." << std::endl;
#elif defined(KOKKOS_ENABLE_HIP)
errmsg << "Check that your MPI library is RocM aware." << std::endl;
#else
errmsg << "Check your MPI library configuration." << std::endl;
#endif
IDEFIX_ERROR(errmsg);
}
// This routine check that all of the processes are synced.
// Returns true if this is the case, false otherwise
bool Mpi::CheckSync(real timeout) {
// If no parallelism, then we're in sync!
if(idfx::psize == 1) return(true);
int send = idfx::prank;
int recv = 0;
MPI_Request request;
MPI_Iallreduce(&send, &recv, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD, &request);
double start = MPI_Wtime();
int flag = 0;
MPI_Status status;
while((MPI_Wtime()-start < timeout) && !flag) {
MPI_Test(&request, &flag, &status);
// sleep for 10 ms
std::this_thread::sleep_for(std::chrono::milliseconds(10));
}
if(!flag) {
// We did not managed to do an allreduce, so this is a failure.
return(false);
}
if(recv != idfx::psize*(idfx::psize-1)/2) {
IDEFIX_ERROR("wrong result for synchronisation");
}
return(true);
}
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