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Download staged GPU sync regions incrementally

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This commit is contained in:
CGH0S7
2026-04-09 18:23:05 +08:00
parent 3b16795e78
commit 5bc67ded06
3 changed files with 147 additions and 5 deletions
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73
AMSS_NCKU_source/bssn_cuda_step.C
View File

@@ -243,6 +243,69 @@ void bssn_class::Step_MainPath_GPU(int lev, int YN)
}
};
auto refresh_stage_host_before_sync =
[&](MyList<var> *var_list, Parallel::SyncCache &cache) -> bool {
if (!cache.valid || !cache.combined_src || myrank < 0 || myrank >= cache.cpusize)
return false;
MyList<Patch> *patch_it = GH->PatL[lev];
while (patch_it)
{
MyList<Block> *block_it = patch_it->data->blb;
while (block_it)
{
Block *cg = block_it->data;
if (myrank == cg->rank)
{
std::vector<Parallel::gridseg *> local_segments;
MyList<Parallel::gridseg> *seg = cache.combined_src[myrank];
while (seg)
{
if (seg->data && seg->data->Bg == cg)
local_segments.push_back(seg->data);
seg = seg->next;
}
if (!local_segments.empty())
{
MyList<var> *var_it = var_list;
while (var_it)
{
double *host_ptr = cg->fgfs[var_it->data->sgfn];
for (size_t i = 0; i < local_segments.size(); ++i)
{
Parallel::gridseg *src_seg = local_segments[i];
if (bssn_gpu_stage_download_region(host_ptr,
cg->shape,
cg->bbox,
cg->bbox + dim,
src_seg->shape,
src_seg->llb))
{
cerr << "GPU sync region download failure: lev=" << lev
<< " var=" << var_it->data->name
<< " bbox=(" << cg->bbox[0] << ":" << cg->bbox[3] << ","
<< cg->bbox[1] << ":" << cg->bbox[4] << ","
<< cg->bbox[2] << ":" << cg->bbox[5] << ")" << endl;
ERROR = 1;
return true;
}
}
var_it = var_it->next;
}
}
}
if (block_it == patch_it->data->ble)
break;
block_it = block_it->next;
}
patch_it = patch_it->next;
}
return true;
};
MyList<Patch> *Pp = GH->PatL[lev];
while (Pp)
{
@@ -268,7 +331,7 @@ void bssn_class::Step_MainPath_GPU(int lev, int YN)
<< cg->bbox[2] << ":" << cg->bbox[5] << ")" << endl;
ERROR = 1;
}
if (!ERROR)
if (!ERROR && !sync_cache_pre[lev].valid)
stage_download_var_list(cg, SynchList_pre);
}
if (BP == Pp->data->ble)
@@ -278,6 +341,9 @@ void bssn_class::Step_MainPath_GPU(int lev, int YN)
Pp = Pp->next;
}
if (!ERROR && sync_cache_pre[lev].valid)
refresh_stage_host_before_sync(SynchList_pre, sync_cache_pre[lev]);
MPI_Request err_req_pre;
{
int erh = ERROR;
@@ -356,7 +422,7 @@ void bssn_class::Step_MainPath_GPU(int lev, int YN)
<< cg->bbox[2] << ":" << cg->bbox[5] << ")" << endl;
ERROR = 1;
}
if (!ERROR)
if (!ERROR && (!sync_cache_cor[lev].valid || iter_count == 3))
stage_download_var_list(cg, SynchList_cor);
}
@@ -367,6 +433,9 @@ void bssn_class::Step_MainPath_GPU(int lev, int YN)
Pp = Pp->next;
}
if (!ERROR && sync_cache_cor[lev].valid && iter_count < 3)
refresh_stage_host_before_sync(SynchList_cor, sync_cache_cor[lev]);
MPI_Request err_req_cor;
{
int erh = ERROR;

67
AMSS_NCKU_source/bssn_gpu.cu
View File

@@ -914,6 +914,73 @@ int bssn_gpu_stage_upload_region(const double *host_ptr,
return 0;
}
int bssn_gpu_stage_download_region(double *host_ptr,
const int *full_shape,
const double *full_llb,
const double *full_uub,
const int *region_shape,
const double *region_llb)
{
if (!host_ptr || !full_shape || !full_llb || !full_uub || !region_shape || !region_llb)
return 1;
const double *device_ptr = bssn_gpu_find_device_buffer(host_ptr);
if (!device_ptr)
return 1;
int start[3] = {0, 0, 0};
for (int i = 0; i < 3; ++i)
{
if (full_shape[i] <= 0 || region_shape[i] <= 0)
return 1;
#ifdef Vertex
#ifdef Cell
#error Both Cell and Vertex are defined
#endif
const double dx = (full_uub[i] - full_llb[i]) / static_cast<double>(full_shape[i] - 1);
start[i] = static_cast<int>((region_llb[i] - full_llb[i]) / dx + 0.4);
#else
#ifdef Cell
const double dx = (full_uub[i] - full_llb[i]) / static_cast<double>(full_shape[i]);
start[i] = static_cast<int>((region_llb[i] - full_llb[i]) / dx + 0.4);
#else
#error Not define Vertex nor Cell
#endif
#endif
if (start[i] < 0 || start[i] + region_shape[i] > full_shape[i])
return 1;
}
cudaMemcpy3DParms parms = {};
parms.srcPtr = make_cudaPitchedPtr(const_cast<double *>(device_ptr),
static_cast<size_t>(full_shape[0]) * sizeof(double),
static_cast<size_t>(full_shape[0]),
static_cast<size_t>(full_shape[1]));
parms.dstPtr = make_cudaPitchedPtr(host_ptr,
static_cast<size_t>(full_shape[0]) * sizeof(double),
static_cast<size_t>(full_shape[0]),
static_cast<size_t>(full_shape[1]));
parms.srcPos = make_cudaPos(static_cast<size_t>(start[0]) * sizeof(double),
static_cast<size_t>(start[1]),
static_cast<size_t>(start[2]));
parms.dstPos = parms.srcPos;
parms.extent = make_cudaExtent(static_cast<size_t>(region_shape[0]) * sizeof(double),
static_cast<size_t>(region_shape[1]),
static_cast<size_t>(region_shape[2]));
parms.kind = cudaMemcpyDeviceToHost;
cudaError_t err = cudaMemcpy3D(&parms);
if (err != cudaSuccess)
{
cerr << "cudaMemcpy3D(D2H region) failed: " << cudaGetErrorString(err) << endl;
return 1;
}
return 0;
}
__global__ void test_const_address(double * testd){
int _t = blockIdx.x*blockDim.x+threadIdx.x;
if(_t == 0)

6
AMSS_NCKU_source/bssn_gpu.h
View File

@@ -77,6 +77,12 @@ int bssn_gpu_stage_upload_region(const double *host_ptr,
const double *full_uub,
const int *region_shape,
const double *region_llb);
int bssn_gpu_stage_download_region(double *host_ptr,
const int *full_shape,
const double *full_llb,
const double *full_uub,
const int *region_shape,
const double *region_llb);
/** Init GPU side data in GPUMeta. */
// void init_fluid_meta_gpu(GPUMeta *gpu_meta);