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Renable cache blocking and efficient UPI type SHM comms

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This commit is contained in:
Peter Boyle
2023-03-14 09:10:27 -07:00
parent cad5b187dd
commit eeb6e0a6e3
5 changed files with 112 additions and 10 deletions
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4
Grid/qcd/action/fermion/implementation/WilsonFermion5DImplementation.h
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@ -63,6 +63,10 @@ WilsonFermion5D<Impl>::WilsonFermion5D(GaugeField &_Umu,
_tmp(&FiveDimRedBlackGrid),
Dirichlet(0)
{
Stencil.lo = &Lebesgue;
StencilEven.lo = &LebesgueEvenOdd;
StencilOdd.lo = &LebesgueEvenOdd;
// some assertions
assert(FiveDimGrid._ndimension==5);
assert(FourDimGrid._ndimension==4);

3
Grid/qcd/action/fermion/implementation/WilsonFermionImplementation.h
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@ -60,6 +60,9 @@ WilsonFermion<Impl>::WilsonFermion(GaugeField &_Umu, GridCartesian &Fgrid,
_tmp(&Hgrid),
anisotropyCoeff(anis)
{
Stencil.lo = &Lebesgue;
StencilEven.lo = &LebesgueEvenOdd;
StencilOdd.lo = &LebesgueEvenOdd;
// Allocate the required comms buffer
ImportGauge(_Umu);
if (anisotropyCoeff.isAnisotropic){

3
Grid/qcd/action/fermion/implementation/WilsonKernelsImplementation.h
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@ -433,7 +433,8 @@ void WilsonKernels<Impl>::DhopDirKernel( StencilImpl &st, DoubledGaugeField &U,S
});
#define ASM_CALL(A) \
thread_for( ss, Nsite, { \
thread_for( sss, Nsite, { \
int ss = st.lo->Reorder(sss); \
int sU = ss; \
int sF = ss*Ls; \
WilsonKernels<Impl>::A(st_v,U_v,buf,sF,sU,Ls,1,in_v,out_v); \

102
Grid/stencil/Stencil.h
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@ -290,9 +290,9 @@ public:
protected:
GridBase * _grid;
public:
GridBase *Grid(void) const { return _grid; }
LebesgueOrder *lo;
////////////////////////////////////////////////////////////////////////
// Needed to conveniently communicate gparity parameters into GPU memory
@ -337,6 +337,7 @@ public:
////////////////////////////////////////
// Stencil query
////////////////////////////////////////
#ifdef SHM_FAST_PATH
inline int SameNode(int point) {
int dimension = this->_directions[point];
@ -356,7 +357,40 @@ public:
if ( displacement == 0 ) return 1;
return 0;
}
#else
//
inline int SameNode(int point) {
int dimension = this->_directions[point];
int displacement = this->_distances[point];
int pd = _grid->_processors[dimension];
int fd = _grid->_fdimensions[dimension];
int ld = _grid->_ldimensions[dimension];
int rd = _grid->_rdimensions[dimension];
int simd_layout = _grid->_simd_layout[dimension];
int comm_dim = _grid->_processors[dimension] >1 ;
int recv_from_rank;
int xmit_to_rank;
if ( ! comm_dim ) return 1;
int nbr_proc;
if (displacement>0) nbr_proc = 1;
else nbr_proc = pd-1;
// FIXME this logic needs to be sorted for three link term
// assert( (displacement==1) || (displacement==-1));
// Present hack only works for >= 4^4 subvol per node
_grid->ShiftedRanks(dimension,nbr_proc,xmit_to_rank,recv_from_rank);
void *shm = (void *) _grid->ShmBufferTranslate(recv_from_rank,this->u_recv_buf_p);
if ( (shm==NULL) ) return 0;
return 1;
}
#endif
//////////////////////////////////////////
// Comms packet queue for asynch thread
// Use OpenMP Tasks for cleaner ???
@ -1127,11 +1161,32 @@ public:
recv_buf=this->u_recv_buf_p;
}
// potential SHM fast path for intranode
int shm_send=0;
int shm_recv=0;
#ifdef SHM_FAST_PATH
// Put directly in place if we can
send_buf = (cobj *)_grid->ShmBufferTranslate(xmit_to_rank,recv_buf);
if ( (send_buf==NULL) ) {
shm_send=0;
send_buf = this->u_send_buf_p;
} else {
shm_send=1;
}
void *test_ptr = _grid->ShmBufferTranslate(recv_from_rank,recv_buf);
if ( test_ptr != NULL ) shm_recv = 1;
// static int printed;
// if (!printed){
// std::cout << " GATHER FAST PATH SHM "<<shm_send<< " "<<shm_recv<<std::endl;
// printed = 1;
// }
#else
////////////////////////////////////////////////////////
// Gather locally
////////////////////////////////////////////////////////
send_buf = this->u_send_buf_p; // Gather locally, must send
assert(send_buf!=NULL);
#endif
// std::cout << " GatherPlaneSimple partial send "<< comms_partial_send<<std::endl;
compressor::Gather_plane_simple(face_table[face_idx],rhs,send_buf,compress,comm_off,so,comms_partial_send);
@ -1143,10 +1198,13 @@ public:
// Build a list of things to do after we synchronise GPUs
// Start comms now???
///////////////////////////////////////////////////////////
int do_send = (comms_send|comms_partial_send) && (!shm_send );
int do_recv = (comms_send|comms_partial_send) && (!shm_recv );
AddPacket((void *)&send_buf[comm_off],
(void *)&recv_buf[comm_off],
xmit_to_rank, comms_send|comms_partial_send,
recv_from_rank, comms_recv|comms_partial_recv,
xmit_to_rank, do_send,
recv_from_rank, do_recv,
xbytes,rbytes);
}
@ -1288,19 +1346,47 @@ public:
int recv_from_rank;
int xmit_to_rank;
int shm_send=0;
int shm_recv=0;
_grid->ShiftedRanks(dimension,nbr_proc,xmit_to_rank,recv_from_rank);
#ifdef SHM_FAST_PATH
#warning STENCIL SHM FAST PATH SELECTED
// shm == receive pointer if offnode
// shm == Translate[send pointer] if on node -- my view of his send pointer
cobj *shm = (cobj *) _grid->ShmBufferTranslate(recv_from_rank,sp);
if (shm==NULL) {
shm = rp;
// we found a packet that comes from MPI and contributes to this shift.
// is_same_node is only used in the WilsonStencil, and gets set for this point in the stencil.
// Kernel will add the exterior_terms except if is_same_node.
// leg of stencil
shm_recv=0;
} else {
shm_recv=1;
}
rpointers[i] = shm;
// Test send side
void *test_ptr = (void *) _grid->ShmBufferTranslate(xmit_to_rank,sp);
if ( test_ptr != NULL ) shm_send = 1;
// static int printed;
// if (!printed){
// std::cout << " GATHERSIMD FAST PATH SHM "<<shm_send<< " "<<shm_recv<<std::endl;
// printed = 1;
// }
#else
rpointers[i] = rp;
#endif
int duplicate = CheckForDuplicate(dimension,sx,nbr_proc,(void *)rp,i,xbytes,rbytes,cbmask);
if ( !duplicate ) {
if ( (bytes != rbytes) && (rbytes!=0) ){
acceleratorMemSet(rp,0,bytes); // Zero prefill comms buffer to zero
}
int do_send = (comms_send|comms_partial_send) && (!shm_send );
int do_recv = (comms_send|comms_partial_send) && (!shm_recv );
AddPacket((void *)sp,(void *)rp,
xmit_to_rank,comms_send|comms_partial_send,
recv_from_rank,comms_recv|comms_partial_recv,
xmit_to_rank,do_send,
recv_from_rank,do_send,
xbytes,rbytes);
}
@ -1310,7 +1396,7 @@ public:
}
}
// rpointer may be doing a remote read in the gather over SHM
if ( comms_recv|comms_partial_recv ) {
AddMerge(&this->u_recv_buf_p[comm_off],rpointers,reduced_buffer_size,permute_type,Mergers);
}

8
configure.ac
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@ -646,6 +646,14 @@ case ${ac_SHM_FORCE_MPI} in
;;
*) ;;
esac
############### force MPI in SMP
AC_ARG_ENABLE([shm-fast-path],[AS_HELP_STRING([--enable-shm-fast-path],[Allow kernels to remote copy over intranode])],[ac_SHM_FAST_PATH=${enable_shm_fast_path}],[ac_SHM_FAST_PATH=no])
case ${ac_SHM_FAST_PATH} in
yes)
AC_DEFINE([SHM_FAST_PATH],[1],[SHM_FAST_PATH] )
;;
*) ;;
esac
############### communication type selection
AC_ARG_ENABLE([comms-threads],[AS_HELP_STRING([--enable-comms-threads | --disable-comms-threads],[Use multiple threads in MPI calls])],[ac_COMMS_THREADS=${enable_comms_threads}],[ac_COMMS_THREADS=yes])