portelli/Grid
1
0
Fork 0
mirror of https://github.com/paboyle/Grid.git synced 2025-04-25 13:15:55 +01:00
Code Releases Activity

Faster RNG init

Browse Source
This commit is contained in:
Peter Boyle 2022-06-01 19:25:42 -04:00
parent 6a1a198144
commit b1ede7b46d
1 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
Grid/lattice/Lattice_rng.h
View File

@ -424,9 +424,30 @@ public:
// MT implementation does not implement fast discard even though
// in principle this is possible
////////////////////////////////////////////////
#if 1
thread_for( lidx, _grid->lSites(), {
int gidx;
Coordinate pcoor;
Coordinate lcoor;
Coordinate gcoor;
_grid->LocalIndexToLocalCoor(lidx,lcoor);
pcoor=_grid->ThisProcessorCoor();
_grid->ProcessorCoorLocalCoorToGlobalCoor(pcoor,lcoor,gcoor);
int o_idx;
int i_idx;
int rank;
_grid->GlobalCoorToRankIndex(rank,o_idx,i_idx,gcoor);
assert(rank == _grid->ThisRank() );
int l_idx=generator_idx(o_idx,i_idx);
_generators[l_idx] = master_engine;
Skip(_generators[l_idx],gidx); // Skip to next RNG sequence
});
#else
// Everybody loops over global volume.
thread_for( gidx, _grid->_gsites, {
// Where is it?
int rank;
int o_idx;
@ -443,6 +464,7 @@ public:
Skip(_generators[l_idx],gidx); // Skip to next RNG sequence
}
});
#endif
#else
////////////////////////////////////////////////////////////////
// Machine and thread decomposition dependent seeding is efficient