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lulesh-comm.cc
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lulesh-comm.cc
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#include "lulesh.h"
// If no MPI, then this whole file is stubbed out
#if USE_MPI
#include <mpi.h>
#include <string.h>
/* Comm Routines */
#define ALLOW_UNPACKED_PLANE false
#define ALLOW_UNPACKED_ROW false
#define ALLOW_UNPACKED_COL false
/*
There are coherence issues for packing and unpacking message
buffers. Ideally, you would like a lot of threads to
cooperate in the assembly/dissassembly of each message.
To do that, each thread should really be operating in a
different coherence zone.
Let's assume we have three fields, f1 through f3, defined on
a 61x61x61 cube. If we want to send the block boundary
information for each field to each neighbor processor across
each cube face, then we have three cases for the
memory layout/coherence of data on each of the six cube
boundaries:
(a) Two of the faces will be in contiguous memory blocks
(b) Two of the faces will be comprised of pencils of
contiguous memory.
(c) Two of the faces will have large strides between
every value living on the face.
How do you pack and unpack this data in buffers to
simultaneous achieve the best memory efficiency and
the most thread independence?
Do do you pack field f1 through f3 tighly to reduce message
size? Do you align each field on a cache coherence boundary
within the message so that threads can pack and unpack each
field independently? For case (b), do you align each
boundary pencil of each field separately? This increases
the message size, but could improve cache coherence so
each pencil could be processed independently by a separate
thread with no conflicts.
Also, memory access for case (c) would best be done without
going through the cache (the stride is so large it just causes
a lot of useless cache evictions). Is it worth creating
a special case version of the packing algorithm that uses
non-coherent load/store opcodes?
*/
/******************************************/
/* doRecv flag only works with regular block structure */
void CommRecv(Domain& domain, Int_t msgType, Index_t xferFields,
Index_t dx, Index_t dy, Index_t dz, bool doRecv, bool planeOnly) {
if (domain.numRanks() == 1)
return ;
/* post recieve buffers for all incoming messages */
int myRank ;
Index_t maxPlaneComm = xferFields * domain.maxPlaneSize() ;
Index_t maxEdgeComm = xferFields * domain.maxEdgeSize() ;
Index_t pmsg = 0 ; /* plane comm msg */
Index_t emsg = 0 ; /* edge comm msg */
Index_t cmsg = 0 ; /* corner comm msg */
MPI_Datatype baseType = ((sizeof(Real_t) == 4) ? MPI_FLOAT : MPI_DOUBLE) ;
bool rowMin, rowMax, colMin, colMax, planeMin, planeMax ;
/* assume communication to 6 neighbors by default */
rowMin = rowMax = colMin = colMax = planeMin = planeMax = true ;
if (domain.rowLoc() == 0) {
rowMin = false ;
}
if (domain.rowLoc() == (domain.tp()-1)) {
rowMax = false ;
}
if (domain.colLoc() == 0) {
colMin = false ;
}
if (domain.colLoc() == (domain.tp()-1)) {
colMax = false ;
}
if (domain.planeLoc() == 0) {
planeMin = false ;
}
if (domain.planeLoc() == (domain.tp()-1)) {
planeMax = false ;
}
for (Index_t i=0; i<26; ++i) {
domain.recvRequest[i] = MPI_REQUEST_NULL ;
}
MPI_Comm_rank(MPI_COMM_WORLD, &myRank) ;
/* post receives */
/* receive data from neighboring domain faces */
if (planeMin && doRecv) {
/* contiguous memory */
int fromRank = myRank - domain.tp()*domain.tp() ;
int recvCount = dx * dy * xferFields ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm],
recvCount, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg]) ;
++pmsg ;
}
if (planeMax) {
/* contiguous memory */
int fromRank = myRank + domain.tp()*domain.tp() ;
int recvCount = dx * dy * xferFields ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm],
recvCount, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg]) ;
++pmsg ;
}
if (rowMin && doRecv) {
/* semi-contiguous memory */
int fromRank = myRank - domain.tp() ;
int recvCount = dx * dz * xferFields ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm],
recvCount, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg]) ;
++pmsg ;
}
if (rowMax) {
/* semi-contiguous memory */
int fromRank = myRank + domain.tp() ;
int recvCount = dx * dz * xferFields ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm],
recvCount, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg]) ;
++pmsg ;
}
if (colMin && doRecv) {
/* scattered memory */
int fromRank = myRank - 1 ;
int recvCount = dy * dz * xferFields ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm],
recvCount, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg]) ;
++pmsg ;
}
if (colMax) {
/* scattered memory */
int fromRank = myRank + 1 ;
int recvCount = dy * dz * xferFields ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm],
recvCount, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg]) ;
++pmsg ;
}
if (!planeOnly) {
/* receive data from domains connected only by an edge */
if (rowMin && colMin && doRecv) {
int fromRank = myRank - domain.tp() - 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dz * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMin && planeMin && doRecv) {
int fromRank = myRank - domain.tp()*domain.tp() - domain.tp() ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dx * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (colMin && planeMin && doRecv) {
int fromRank = myRank - domain.tp()*domain.tp() - 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dy * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMax && colMax) {
int fromRank = myRank + domain.tp() + 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dz * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMax && planeMax) {
int fromRank = myRank + domain.tp()*domain.tp() + domain.tp() ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dx * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (colMax && planeMax) {
int fromRank = myRank + domain.tp()*domain.tp() + 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dy * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMax && colMin) {
int fromRank = myRank + domain.tp() - 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dz * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMin && planeMax) {
int fromRank = myRank + domain.tp()*domain.tp() - domain.tp() ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dx * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (colMin && planeMax) {
int fromRank = myRank + domain.tp()*domain.tp() - 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dy * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMin && colMax && doRecv) {
int fromRank = myRank - domain.tp() + 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dz * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMax && planeMin && doRecv) {
int fromRank = myRank - domain.tp()*domain.tp() + domain.tp() ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dx * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
if (colMax && planeMin && doRecv) {
int fromRank = myRank - domain.tp()*domain.tp() + 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm],
dy * xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg]) ;
++emsg ;
}
/* receive data from domains connected only by a corner */
if (rowMin && colMin && planeMin && doRecv) {
/* corner at domain logical coord (0, 0, 0) */
int fromRank = myRank - domain.tp()*domain.tp() - domain.tp() - 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL],
xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMin && colMin && planeMax) {
/* corner at domain logical coord (0, 0, 1) */
int fromRank = myRank + domain.tp()*domain.tp() - domain.tp() - 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL],
xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMin && colMax && planeMin && doRecv) {
/* corner at domain logical coord (1, 0, 0) */
int fromRank = myRank - domain.tp()*domain.tp() - domain.tp() + 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL],
xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMin && colMax && planeMax) {
/* corner at domain logical coord (1, 0, 1) */
int fromRank = myRank + domain.tp()*domain.tp() - domain.tp() + 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL],
xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMax && colMin && planeMin && doRecv) {
/* corner at domain logical coord (0, 1, 0) */
int fromRank = myRank - domain.tp()*domain.tp() + domain.tp() - 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL],
xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMax && colMin && planeMax) {
/* corner at domain logical coord (0, 1, 1) */
int fromRank = myRank + domain.tp()*domain.tp() + domain.tp() - 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL],
xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMax && colMax && planeMin && doRecv) {
/* corner at domain logical coord (1, 1, 0) */
int fromRank = myRank - domain.tp()*domain.tp() + domain.tp() + 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL],
xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMax && colMax && planeMax) {
/* corner at domain logical coord (1, 1, 1) */
int fromRank = myRank + domain.tp()*domain.tp() + domain.tp() + 1 ;
MPI_Irecv(&domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL],
xferFields, baseType, fromRank, msgType,
MPI_COMM_WORLD, &domain.recvRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
}
}
/******************************************/
void CommSend(Domain& domain, Int_t msgType,
Index_t xferFields, Domain_member *fieldData,
Index_t dx, Index_t dy, Index_t dz, bool doSend, bool planeOnly)
{
if (domain.numRanks() == 1)
return ;
/* post recieve buffers for all incoming messages */
int myRank ;
Index_t maxPlaneComm = xferFields * domain.maxPlaneSize() ;
Index_t maxEdgeComm = xferFields * domain.maxEdgeSize() ;
Index_t pmsg = 0 ; /* plane comm msg */
Index_t emsg = 0 ; /* edge comm msg */
Index_t cmsg = 0 ; /* corner comm msg */
MPI_Datatype baseType = ((sizeof(Real_t) == 4) ? MPI_FLOAT : MPI_DOUBLE) ;
MPI_Status status[26] ;
Real_t *destAddr ;
bool rowMin, rowMax, colMin, colMax, planeMin, planeMax ;
/* assume communication to 6 neighbors by default */
rowMin = rowMax = colMin = colMax = planeMin = planeMax = true ;
if (domain.rowLoc() == 0) {
rowMin = false ;
}
if (domain.rowLoc() == (domain.tp()-1)) {
rowMax = false ;
}
if (domain.colLoc() == 0) {
colMin = false ;
}
if (domain.colLoc() == (domain.tp()-1)) {
colMax = false ;
}
if (domain.planeLoc() == 0) {
planeMin = false ;
}
if (domain.planeLoc() == (domain.tp()-1)) {
planeMax = false ;
}
for (Index_t i=0; i<26; ++i) {
domain.sendRequest[i] = MPI_REQUEST_NULL ;
}
MPI_Comm_rank(MPI_COMM_WORLD, &myRank) ;
/* post sends */
if (planeMin | planeMax) {
/* ASSUMING ONE DOMAIN PER RANK, CONSTANT BLOCK SIZE HERE */
int sendCount = dx * dy ;
if (planeMin) {
destAddr = &domain.commDataSend[pmsg * maxPlaneComm] ;
for (Index_t fi=0 ; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<sendCount; ++i) {
destAddr[i] = (domain.*src)(i) ;
}
destAddr += sendCount ;
}
destAddr -= xferFields*sendCount ;
MPI_Isend(destAddr, xferFields*sendCount, baseType,
myRank - domain.tp()*domain.tp(), msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg]) ;
++pmsg ;
}
if (planeMax && doSend) {
destAddr = &domain.commDataSend[pmsg * maxPlaneComm] ;
for (Index_t fi=0 ; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<sendCount; ++i) {
destAddr[i] = (domain.*src)(dx*dy*(dz - 1) + i) ;
}
destAddr += sendCount ;
}
destAddr -= xferFields*sendCount ;
MPI_Isend(destAddr, xferFields*sendCount, baseType,
myRank + domain.tp()*domain.tp(), msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg]) ;
++pmsg ;
}
}
if (rowMin | rowMax) {
/* ASSUMING ONE DOMAIN PER RANK, CONSTANT BLOCK SIZE HERE */
int sendCount = dx * dz ;
if (rowMin) {
destAddr = &domain.commDataSend[pmsg * maxPlaneComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
for (Index_t j=0; j<dx; ++j) {
destAddr[i*dx+j] = (domain.*src)(i*dx*dy + j) ;
}
}
destAddr += sendCount ;
}
destAddr -= xferFields*sendCount ;
MPI_Isend(destAddr, xferFields*sendCount, baseType,
myRank - domain.tp(), msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg]) ;
++pmsg ;
}
if (rowMax && doSend) {
destAddr = &domain.commDataSend[pmsg * maxPlaneComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
for (Index_t j=0; j<dx; ++j) {
destAddr[i*dx+j] = (domain.*src)(dx*(dy - 1) + i*dx*dy + j) ;
}
}
destAddr += sendCount ;
}
destAddr -= xferFields*sendCount ;
MPI_Isend(destAddr, xferFields*sendCount, baseType,
myRank + domain.tp(), msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg]) ;
++pmsg ;
}
}
if (colMin | colMax) {
/* ASSUMING ONE DOMAIN PER RANK, CONSTANT BLOCK SIZE HERE */
int sendCount = dy * dz ;
if (colMin) {
destAddr = &domain.commDataSend[pmsg * maxPlaneComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
for (Index_t j=0; j<dy; ++j) {
destAddr[i*dy + j] = (domain.*src)(i*dx*dy + j*dx) ;
}
}
destAddr += sendCount ;
}
destAddr -= xferFields*sendCount ;
MPI_Isend(destAddr, xferFields*sendCount, baseType,
myRank - 1, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg]) ;
++pmsg ;
}
if (colMax && doSend) {
destAddr = &domain.commDataSend[pmsg * maxPlaneComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
for (Index_t j=0; j<dy; ++j) {
destAddr[i*dy + j] = (domain.*src)(dx - 1 + i*dx*dy + j*dx) ;
}
}
destAddr += sendCount ;
}
destAddr -= xferFields*sendCount ;
MPI_Isend(destAddr, xferFields*sendCount, baseType,
myRank + 1, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg]) ;
++pmsg ;
}
}
if (!planeOnly) {
if (rowMin && colMin) {
int toRank = myRank - domain.tp() - 1 ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
destAddr[i] = (domain.*src)(i*dx*dy) ;
}
destAddr += dz ;
}
destAddr -= xferFields*dz ;
MPI_Isend(destAddr, xferFields*dz, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMin && planeMin) {
int toRank = myRank - domain.tp()*domain.tp() - domain.tp() ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dx; ++i) {
destAddr[i] = (domain.*src)(i) ;
}
destAddr += dx ;
}
destAddr -= xferFields*dx ;
MPI_Isend(destAddr, xferFields*dx, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (colMin && planeMin) {
int toRank = myRank - domain.tp()*domain.tp() - 1 ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dy; ++i) {
destAddr[i] = (domain.*src)(i*dx) ;
}
destAddr += dy ;
}
destAddr -= xferFields*dy ;
MPI_Isend(destAddr, xferFields*dy, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMax && colMax && doSend) {
int toRank = myRank + domain.tp() + 1 ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
destAddr[i] = (domain.*src)(dx*dy - 1 + i*dx*dy) ;
}
destAddr += dz ;
}
destAddr -= xferFields*dz ;
MPI_Isend(destAddr, xferFields*dz, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMax && planeMax && doSend) {
int toRank = myRank + domain.tp()*domain.tp() + domain.tp() ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dx; ++i) {
destAddr[i] = (domain.*src)(dx*(dy-1) + dx*dy*(dz-1) + i) ;
}
destAddr += dx ;
}
destAddr -= xferFields*dx ;
MPI_Isend(destAddr, xferFields*dx, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (colMax && planeMax && doSend) {
int toRank = myRank + domain.tp()*domain.tp() + 1 ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dy; ++i) {
destAddr[i] = (domain.*src)(dx*dy*(dz-1) + dx - 1 + i*dx) ;
}
destAddr += dy ;
}
destAddr -= xferFields*dy ;
MPI_Isend(destAddr, xferFields*dy, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMax && colMin && doSend) {
int toRank = myRank + domain.tp() - 1 ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
destAddr[i] = (domain.*src)(dx*(dy-1) + i*dx*dy) ;
}
destAddr += dz ;
}
destAddr -= xferFields*dz ;
MPI_Isend(destAddr, xferFields*dz, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMin && planeMax && doSend) {
int toRank = myRank + domain.tp()*domain.tp() - domain.tp() ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dx; ++i) {
destAddr[i] = (domain.*src)(dx*dy*(dz-1) + i) ;
}
destAddr += dx ;
}
destAddr -= xferFields*dx ;
MPI_Isend(destAddr, xferFields*dx, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (colMin && planeMax && doSend) {
int toRank = myRank + domain.tp()*domain.tp() - 1 ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dy; ++i) {
destAddr[i] = (domain.*src)(dx*dy*(dz-1) + i*dx) ;
}
destAddr += dy ;
}
destAddr -= xferFields*dy ;
MPI_Isend(destAddr, xferFields*dy, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMin && colMax) {
int toRank = myRank - domain.tp() + 1 ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
destAddr[i] = (domain.*src)(dx - 1 + i*dx*dy) ;
}
destAddr += dz ;
}
destAddr -= xferFields*dz ;
MPI_Isend(destAddr, xferFields*dz, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMax && planeMin) {
int toRank = myRank - domain.tp()*domain.tp() + domain.tp() ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dx; ++i) {
destAddr[i] = (domain.*src)(dx*(dy - 1) + i) ;
}
destAddr += dx ;
}
destAddr -= xferFields*dx ;
MPI_Isend(destAddr, xferFields*dx, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (colMax && planeMin) {
int toRank = myRank - domain.tp()*domain.tp() + 1 ;
destAddr = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
Domain_member src = fieldData[fi] ;
for (Index_t i=0; i<dy; ++i) {
destAddr[i] = (domain.*src)(dx - 1 + i*dx) ;
}
destAddr += dy ;
}
destAddr -= xferFields*dy ;
MPI_Isend(destAddr, xferFields*dy, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg]) ;
++emsg ;
}
if (rowMin && colMin && planeMin) {
/* corner at domain logical coord (0, 0, 0) */
int toRank = myRank - domain.tp()*domain.tp() - domain.tp() - 1 ;
Real_t *comBuf = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL] ;
for (Index_t fi=0; fi<xferFields; ++fi) {
comBuf[fi] = (domain.*fieldData[fi])(0) ;
}
MPI_Isend(comBuf, xferFields, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMin && colMin && planeMax && doSend) {
/* corner at domain logical coord (0, 0, 1) */
int toRank = myRank + domain.tp()*domain.tp() - domain.tp() - 1 ;
Real_t *comBuf = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL] ;
Index_t idx = dx*dy*(dz - 1) ;
for (Index_t fi=0; fi<xferFields; ++fi) {
comBuf[fi] = (domain.*fieldData[fi])(idx) ;
}
MPI_Isend(comBuf, xferFields, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMin && colMax && planeMin) {
/* corner at domain logical coord (1, 0, 0) */
int toRank = myRank - domain.tp()*domain.tp() - domain.tp() + 1 ;
Real_t *comBuf = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL] ;
Index_t idx = dx - 1 ;
for (Index_t fi=0; fi<xferFields; ++fi) {
comBuf[fi] = (domain.*fieldData[fi])(idx) ;
}
MPI_Isend(comBuf, xferFields, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMin && colMax && planeMax && doSend) {
/* corner at domain logical coord (1, 0, 1) */
int toRank = myRank + domain.tp()*domain.tp() - domain.tp() + 1 ;
Real_t *comBuf = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL] ;
Index_t idx = dx*dy*(dz - 1) + (dx - 1) ;
for (Index_t fi=0; fi<xferFields; ++fi) {
comBuf[fi] = (domain.*fieldData[fi])(idx) ;
}
MPI_Isend(comBuf, xferFields, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMax && colMin && planeMin) {
/* corner at domain logical coord (0, 1, 0) */
int toRank = myRank - domain.tp()*domain.tp() + domain.tp() - 1 ;
Real_t *comBuf = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL] ;
Index_t idx = dx*(dy - 1) ;
for (Index_t fi=0; fi<xferFields; ++fi) {
comBuf[fi] = (domain.*fieldData[fi])(idx) ;
}
MPI_Isend(comBuf, xferFields, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMax && colMin && planeMax && doSend) {
/* corner at domain logical coord (0, 1, 1) */
int toRank = myRank + domain.tp()*domain.tp() + domain.tp() - 1 ;
Real_t *comBuf = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL] ;
Index_t idx = dx*dy*(dz - 1) + dx*(dy - 1) ;
for (Index_t fi=0; fi<xferFields; ++fi) {
comBuf[fi] = (domain.*fieldData[fi])(idx) ;
}
MPI_Isend(comBuf, xferFields, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMax && colMax && planeMin) {
/* corner at domain logical coord (1, 1, 0) */
int toRank = myRank - domain.tp()*domain.tp() + domain.tp() + 1 ;
Real_t *comBuf = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL] ;
Index_t idx = dx*dy - 1 ;
for (Index_t fi=0; fi<xferFields; ++fi) {
comBuf[fi] = (domain.*fieldData[fi])(idx) ;
}
MPI_Isend(comBuf, xferFields, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
if (rowMax && colMax && planeMax && doSend) {
/* corner at domain logical coord (1, 1, 1) */
int toRank = myRank + domain.tp()*domain.tp() + domain.tp() + 1 ;
Real_t *comBuf = &domain.commDataSend[pmsg * maxPlaneComm +
emsg * maxEdgeComm +
cmsg * CACHE_COHERENCE_PAD_REAL] ;
Index_t idx = dx*dy*dz - 1 ;
for (Index_t fi=0; fi<xferFields; ++fi) {
comBuf[fi] = (domain.*fieldData[fi])(idx) ;
}
MPI_Isend(comBuf, xferFields, baseType, toRank, msgType,
MPI_COMM_WORLD, &domain.sendRequest[pmsg+emsg+cmsg]) ;
++cmsg ;
}
}
MPI_Waitall(26, domain.sendRequest, status) ;
}
/******************************************/
void CommSBN(Domain& domain, Int_t xferFields, Domain_member *fieldData) {
if (domain.numRanks() == 1)
return ;
/* summation order should be from smallest value to largest */
/* or we could try out kahan summation! */
int myRank ;
Index_t maxPlaneComm = xferFields * domain.maxPlaneSize() ;
Index_t maxEdgeComm = xferFields * domain.maxEdgeSize() ;
Index_t pmsg = 0 ; /* plane comm msg */
Index_t emsg = 0 ; /* edge comm msg */
Index_t cmsg = 0 ; /* corner comm msg */
Index_t dx = domain.sizeX() + 1 ;
Index_t dy = domain.sizeY() + 1 ;
Index_t dz = domain.sizeZ() + 1 ;
MPI_Status status ;
Real_t *srcAddr ;
Index_t rowMin, rowMax, colMin, colMax, planeMin, planeMax ;
/* assume communication to 6 neighbors by default */
rowMin = rowMax = colMin = colMax = planeMin = planeMax = 1 ;
if (domain.rowLoc() == 0) {
rowMin = 0 ;
}
if (domain.rowLoc() == (domain.tp()-1)) {
rowMax = 0 ;
}
if (domain.colLoc() == 0) {
colMin = 0 ;
}
if (domain.colLoc() == (domain.tp()-1)) {
colMax = 0 ;
}
if (domain.planeLoc() == 0) {
planeMin = 0 ;
}
if (domain.planeLoc() == (domain.tp()-1)) {
planeMax = 0 ;
}
MPI_Comm_rank(MPI_COMM_WORLD, &myRank) ;
if (planeMin | planeMax) {
/* ASSUMING ONE DOMAIN PER RANK, CONSTANT BLOCK SIZE HERE */
Index_t opCount = dx * dy ;
if (planeMin) {
/* contiguous memory */
srcAddr = &domain.commDataRecv[pmsg * maxPlaneComm] ;
MPI_Wait(&domain.recvRequest[pmsg], &status) ;
for (Index_t fi=0 ; fi<xferFields; ++fi) {
Domain_member dest = fieldData[fi] ;
for (Index_t i=0; i<opCount; ++i) {
(domain.*dest)(i) += srcAddr[i] ;
}
srcAddr += opCount ;
}
++pmsg ;
}
if (planeMax) {
/* contiguous memory */
srcAddr = &domain.commDataRecv[pmsg * maxPlaneComm] ;
MPI_Wait(&domain.recvRequest[pmsg], &status) ;
for (Index_t fi=0 ; fi<xferFields; ++fi) {
Domain_member dest = fieldData[fi] ;
for (Index_t i=0; i<opCount; ++i) {
(domain.*dest)(dx*dy*(dz - 1) + i) += srcAddr[i] ;
}
srcAddr += opCount ;
}
++pmsg ;
}
}
if (rowMin | rowMax) {
/* ASSUMING ONE DOMAIN PER RANK, CONSTANT BLOCK SIZE HERE */
Index_t opCount = dx * dz ;
if (rowMin) {
/* contiguous memory */
srcAddr = &domain.commDataRecv[pmsg * maxPlaneComm] ;
MPI_Wait(&domain.recvRequest[pmsg], &status) ;
for (Index_t fi=0 ; fi<xferFields; ++fi) {
Domain_member dest = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
for (Index_t j=0; j<dx; ++j) {
(domain.*dest)(i*dx*dy + j) += srcAddr[i*dx + j] ;
}
}
srcAddr += opCount ;
}
++pmsg ;
}
if (rowMax) {
/* contiguous memory */
srcAddr = &domain.commDataRecv[pmsg * maxPlaneComm] ;
MPI_Wait(&domain.recvRequest[pmsg], &status) ;
for (Index_t fi=0 ; fi<xferFields; ++fi) {
Domain_member dest = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
for (Index_t j=0; j<dx; ++j) {
(domain.*dest)(dx*(dy - 1) + i*dx*dy + j) += srcAddr[i*dx + j] ;
}
}
srcAddr += opCount ;
}
++pmsg ;
}
}
if (colMin | colMax) {
/* ASSUMING ONE DOMAIN PER RANK, CONSTANT BLOCK SIZE HERE */
Index_t opCount = dy * dz ;
if (colMin) {
/* contiguous memory */
srcAddr = &domain.commDataRecv[pmsg * maxPlaneComm] ;
MPI_Wait(&domain.recvRequest[pmsg], &status) ;
for (Index_t fi=0 ; fi<xferFields; ++fi) {
Domain_member dest = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
for (Index_t j=0; j<dy; ++j) {
(domain.*dest)(i*dx*dy + j*dx) += srcAddr[i*dy + j] ;
}
}
srcAddr += opCount ;
}
++pmsg ;
}
if (colMax) {
/* contiguous memory */
srcAddr = &domain.commDataRecv[pmsg * maxPlaneComm] ;
MPI_Wait(&domain.recvRequest[pmsg], &status) ;
for (Index_t fi=0 ; fi<xferFields; ++fi) {
Domain_member dest = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {
for (Index_t j=0; j<dy; ++j) {
(domain.*dest)(dx - 1 + i*dx*dy + j*dx) += srcAddr[i*dy + j] ;
}
}
srcAddr += opCount ;
}
++pmsg ;
}
}
if (rowMin & colMin) {
srcAddr = &domain.commDataRecv[pmsg * maxPlaneComm +
emsg * maxEdgeComm] ;
MPI_Wait(&domain.recvRequest[pmsg+emsg], &status) ;
for (Index_t fi=0 ; fi<xferFields; ++fi) {
Domain_member dest = fieldData[fi] ;
for (Index_t i=0; i<dz; ++i) {