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Grid/tests/Test_stencil.cc
Peter Boyle b52e8ef65a Dirichlet changes
2022-05-19 16:45:41 -07:00

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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./tests/Test_stencil.cc
Copyright (C) 2015
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
Author: Peter Boyle <peterboyle@Peters-MacBook-Pro-2.local>
Author: paboyle <paboyle@ph.ed.ac.uk>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/* END LEGAL */
#include <Grid/Grid.h>
using namespace std;
using namespace Grid;
int main(int argc, char ** argv) {
Grid_init(&argc, &argv);
// typedef LatticeColourMatrix Field;
typedef LatticeComplex Field;
typedef typename Field::vector_object vobj;
typedef typename vobj::scalar_object sobj;
auto latt_size = GridDefaultLatt();
auto simd_layout = GridDefaultSimd(Nd,vComplex::Nsimd());
auto mpi_layout = GridDefaultMpi();
double volume = latt_size[0]*latt_size[1]*latt_size[2]*latt_size[3];
GridCartesian Fine(latt_size,simd_layout,mpi_layout);
GridRedBlackCartesian rbFine(&Fine);
GridParallelRNG fRNG(&Fine);
// fRNG.SeedFixedIntegers(std::vector<int>({45,12,81,9});
std::vector<int> seeds({1,2,3,4});
fRNG.SeedFixedIntegers(seeds);
Field Foo(&Fine);
Field Bar(&Fine);
Field Check(&Fine);
Field Diff(&Fine);
LatticeComplex lex(&Fine);
lex = Zero();
random(fRNG,Foo);
gaussian(fRNG,Bar);
for (int i=0;i<simd_layout.size();i++){
std::cout <<" simd layout "<<i<<" = "<<simd_layout[i]<<std::endl;
}
Integer stride =1000;
{
LatticeComplex coor(&Fine);
for(int d=0;d<Nd;d++){
LatticeCoordinate(coor,d);
lex = lex + coor*stride;
stride=stride/10;
}
Foo=lex;
}
typedef CartesianStencil<vobj,vobj,SimpleStencilParams> Stencil;
SimpleStencilParams p;
for(int dir=0;dir<4;dir++){
for(int disp=0;disp<Fine._fdimensions[dir];disp++){
std::cout<< std::fixed <<GridLogMessage << "Using stencil to shift dim "<<dir<< " by "<<disp<<std::endl;
// start to test the Cartesian npoint stencil infrastructure
int npoint=1;
std::vector<int> directions(npoint,dir);
std::vector<int> displacements(npoint,disp);
Stencil myStencil(&Fine,npoint,0,directions,displacements,p);
Coordinate ocoor(4);
for(int o=0;o<Fine.oSites();o++){
Fine.oCoorFromOindex(ocoor,o);
ocoor[dir]=(ocoor[dir]+disp)%Fine._rdimensions[dir];
}
SimpleCompressor<vobj> compress;
myStencil.HaloExchange(Foo,compress);
Bar = Cshift(Foo,dir,disp);
// Implement a stencil code that should agree with cshift!
{
autoView( check , Check, AcceleratorWrite);
autoView( foo , Foo, AcceleratorRead);
autoView(st_v ,myStencil,AcceleratorRead);
auto CBp=myStencil.CommBuf();
accelerator_for(i,Check.Grid()->oSites(), 1, {
int permute_type;
StencilEntry *SE;
SE = st_v.GetEntry(permute_type,0,i);
if ( SE->_is_local && SE->_permute )
permute(check[i],foo[SE->_offset],permute_type);
else if (SE->_is_local)
check[i] = foo[SE->_offset];
else {
check[i] = CBp[SE->_offset];
}
});
}
Real nrmC = norm2(Check);
Real nrmB = norm2(Bar);
Diff = Check-Bar;
Real nrm = norm2(Diff);
std::cout<<GridLogMessage<<"N2diff ="<<nrm<<" "<<nrmC<<" " <<nrmB<<std::endl;
Coordinate coor(4);
for(coor[3]=0;coor[3]<latt_size[3]/mpi_layout[3];coor[3]++){
for(coor[2]=0;coor[2]<latt_size[2]/mpi_layout[2];coor[2]++){
for(coor[1]=0;coor[1]<latt_size[1]/mpi_layout[1];coor[1]++){
for(coor[0]=0;coor[0]<latt_size[0]/mpi_layout[0];coor[0]++){
RealD diff;
sobj check,bar;
peekSite(check,Check,coor);
peekSite(bar,Bar,coor);
sobj ddiff;
ddiff = check -bar;
diff =norm2(ddiff);
if ( diff > 0){
std::cout <<"Coor (" << coor[0]<<","<<coor[1]<<","<<coor[2]<<","<<coor[3]
<<") " <<check<<" vs "<<bar<<std::endl;
}
}}}}
if (nrm > 1.0e-4) {
autoView( check , Check, CpuRead);
autoView( bar , Bar, CpuRead);
for(int i=0;i<check.size();i++){
std::cout << i<<" Check "<<check[i]<< "\n"<<i<<" Bar "<<bar[i]<<std::endl;
}
}
if (nrm > 1.0e-4) exit(-1);
}
}
std::cout<<GridLogMessage<<"Testing RedBlack\n ";
Field EFoo(&rbFine);
Field OFoo(&rbFine);
Field ECheck(&rbFine);
Field OCheck(&rbFine);
pickCheckerboard(Even,EFoo,Foo);
pickCheckerboard(Odd ,OFoo,Foo);
for(int dir=0;dir<4;dir++){
for(int disp=0;disp<rbFine._fdimensions[dir];disp++){
std::cout<<GridLogMessage << "Using stencil to shift rb dim "<<dir<< " by "<<disp<<std::endl;
// start to test the Cartesian npoint stencil infrastructure
int npoint=1;
std::vector<int> directions(npoint,dir);
std::vector<int> displacements(npoint,disp);
Stencil EStencil(&rbFine,npoint,Even,directions,displacements,p);
Stencil OStencil(&rbFine,npoint,Odd,directions,displacements,p);
Coordinate ocoor(4);
for(int o=0;o<Fine.oSites();o++){
Fine.oCoorFromOindex(ocoor,o);
ocoor[dir]=(ocoor[dir]+disp)%Fine._rdimensions[dir];
}
SimpleCompressor<vobj> compress;
Bar = Cshift(Foo,dir,disp);
if ( disp & 0x1 ) {
ECheck.Checkerboard() = Even;
OCheck.Checkerboard() = Odd;
} else {
ECheck.Checkerboard() = Odd;
OCheck.Checkerboard() = Even;
}
// Implement a stencil code that should agree with that darn cshift!
EStencil.HaloExchange(EFoo,compress);
{
autoView( ocheck , OCheck, AcceleratorWrite);
autoView( efoo , EFoo, AcceleratorRead);
autoView( Est , EStencil,AcceleratorRead);
auto ECBp = EStencil.CommBuf();
accelerator_for(i,OCheck.Grid()->oSites(),1,{
int permute_type;
StencilEntry *SE;
SE = Est.GetEntry(permute_type,0,i);
if ( SE->_is_local && SE->_permute )
permute(ocheck[i],efoo[SE->_offset],permute_type);
else if (SE->_is_local)
ocheck[i] = efoo[SE->_offset];
else
ocheck[i] = ECBp[SE->_offset];
});
}
OStencil.HaloExchange(OFoo,compress);
{
autoView( echeck , ECheck, AcceleratorWrite);
autoView( ofoo , OFoo, AcceleratorRead);
autoView( Ost , OStencil,AcceleratorRead);
auto OCBp = OStencil.CommBuf();
accelerator_for(i,ECheck.Grid()->oSites(),1,{
int permute_type;
StencilEntry *SE;
SE = Ost.GetEntry(permute_type,0,i);
if ( SE->_is_local && SE->_permute )
permute(echeck[i],ofoo[SE->_offset],permute_type);
else if (SE->_is_local)
echeck[i] = ofoo[SE->_offset];
else
echeck[i] = OCBp[SE->_offset];
});
}
setCheckerboard(Check,ECheck);
setCheckerboard(Check,OCheck);
Real nrmC = norm2(Check);
Real nrmB = norm2(Bar);
Diff = Check-Bar;
Real nrm = norm2(Diff);
std::cout<<GridLogMessage<<"RB N2diff ="<<nrm<<" "<<nrmC<<" " <<nrmB<<std::endl;
Coordinate coor(4);
for(coor[3]=0;coor[3]<latt_size[3]/mpi_layout[3];coor[3]++){
for(coor[2]=0;coor[2]<latt_size[2]/mpi_layout[2];coor[2]++){
for(coor[1]=0;coor[1]<latt_size[1]/mpi_layout[1];coor[1]++){
for(coor[0]=0;coor[0]<latt_size[0]/mpi_layout[0];coor[0]++){
RealD diff;
sobj check,bar;
peekSite(check,Check,coor);
peekSite(bar,Bar,coor);
sobj ddiff;
ddiff = check -bar;
diff =norm2(ddiff);
if ( diff > 0){
std::cout <<"Coor (" << coor[0]<<","<<coor[1]<<","<<coor[2]<<","<<coor[3] <<") "
<<"shift "<<disp<<" dir "<< dir
<< " stencil impl " <<check<<" vs cshift impl "<<bar<<std::endl;
}
}}}}
if (nrm > 1.0e-4) exit(-1);
}
}
Grid_finalize();
}
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