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GET not put has kinder barrier sequence for NVLINK type access as when

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GET is done, I can use it without barrier. Moves a barrier to a nicer
place, overlapped with DtoH DMA
This commit is contained in:
Peter Boyle 2025-02-12 14:59:28 +00:00
parent 382e0abefd
commit a7a16df9d0
1 changed files with 10 additions and 1 deletions
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11
Grid/stencil/Stencil.h
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@ -501,6 +501,9 @@ public:
void HaloGather(const Lattice<vobj> &source,compressor &compress)
{
// accelerator_barrier();
//////////////////////////////////
// I will overwrite my send buffers
//////////////////////////////////
_grid->StencilBarrier();// Synch shared memory on a single nodes
assert(source.Grid()==_grid);
@ -514,7 +517,12 @@ public:
HaloGatherDir(source,compress,point,face_idx);
}
accelerator_barrier(); // All my local gathers are complete
// _grid->StencilBarrier();// Synch shared memory on a single nodes
#ifdef NVLINK_GET
#warning "NVLINK_GET"
_grid->StencilBarrier(); // He can now get mu local gather, I can get his
// Synch shared memory on a single nodes; could use an asynchronous barrier here and defer check
// Or issue barrier AFTER the DMA is running
#endif
face_table_computed=1;
assert(u_comm_offset==_unified_buffer_size);
}
@ -553,6 +561,7 @@ public:
coalescedWrite(to[j] ,coalescedRead(from [j]));
});
acceleratorFenceComputeStream();
// Also fenced in WilsonKernels
}
}