cwpearson/astaroth
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MPI: corners are no longer communicated. Slight performance impact (14 ms vs 15 ms). Tests still pass with 8 GPUs.

Browse Source
This commit is contained in:
jpekkila
2020-05-26 19:00:14 +03:00
parent ec59cdb973
commit 7e59ea0eff
1 changed files with 12 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
src/core/device.cc
View File

@@ -576,7 +576,8 @@ acCreatePackedData(const int3 dims)
#if AC_MPI_RT_PINNING
ERRCHK_CUDA_ALWAYS(cudaMallocHost((void**)&data.data_pinned, bytes));
//ERRCHK_CUDA_ALWAYS(cudaMallocManaged((void**)&data.data_pinned, bytes)); // Significantly slower than pinned (38 ms vs. 125 ms)
// ERRCHK_CUDA_ALWAYS(cudaMallocManaged((void**)&data.data_pinned, bytes)); // Significantly
// slower than pinned (38 ms vs. 125 ms)
#endif // AC_MPI_RT_PINNING
#if AC_MPI_UNIDIRECTIONAL_COMM
@@ -674,8 +675,7 @@ acPinPackedData(const Device device, const cudaStream_t stream, PackedData* ddat
const size_t bytes = ddata->dims.x * ddata->dims.y * ddata->dims.z * sizeof(ddata->data[0]) *
NUM_VTXBUF_HANDLES;
ERRCHK_CUDA(
cudaMemcpyAsync(ddata->data_pinned, ddata->data, bytes, cudaMemcpyDefault, stream));
ERRCHK_CUDA(cudaMemcpyAsync(ddata->data_pinned, ddata->data, bytes, cudaMemcpyDefault, stream));
}
static void
@@ -690,8 +690,7 @@ acUnpinPackedData(const Device device, const cudaStream_t stream, PackedData* dd
const size_t bytes = ddata->dims.x * ddata->dims.y * ddata->dims.z * sizeof(ddata->data[0]) *
NUM_VTXBUF_HANDLES;
ERRCHK_CUDA(
cudaMemcpyAsync(ddata->data, ddata->data_pinned, bytes, cudaMemcpyDefault, stream));
ERRCHK_CUDA(cudaMemcpyAsync(ddata->data, ddata->data_pinned, bytes, cudaMemcpyDefault, stream));
}
#endif // AC_MPI_RT_PINNING
@@ -1758,7 +1757,7 @@ acGridIntegrate(const Stream stream, const AcReal dt)
};
for (int isubstep = 0; isubstep < 3; ++isubstep) {
acPackCommData(device, corner_a0s, &corner_data);
// acPackCommData(device, corner_a0s, &corner_data);
acPackCommData(device, edgex_a0s, &edgex_data);
acPackCommData(device, edgey_a0s, &edgey_data);
acPackCommData(device, edgez_a0s, &edgez_data);
@@ -1789,7 +1788,7 @@ acGridIntegrate(const Stream stream, const AcReal dt)
MPI_Barrier(MPI_COMM_WORLD);
#if MPI_GPUDIRECT_DISABLED
acTransferCommDataToHost(device, &corner_data);
// acTransferCommDataToHost(device, &corner_data);
acTransferCommDataToHost(device, &edgex_data);
acTransferCommDataToHost(device, &edgey_data);
acTransferCommDataToHost(device, &edgez_data);
@@ -1798,7 +1797,7 @@ acGridIntegrate(const Stream stream, const AcReal dt)
acTransferCommDataToHost(device, &sideyz_data);
#endif
acTransferCommData(device, corner_a0s, corner_b0s, &corner_data);
// acTransferCommData(device, corner_a0s, corner_b0s, &corner_data);
acTransferCommData(device, edgex_a0s, edgex_b0s, &edgex_data);
acTransferCommData(device, edgey_a0s, edgey_b0s, &edgey_data);
acTransferCommData(device, edgez_a0s, edgez_b0s, &edgez_data);
@@ -1806,7 +1805,7 @@ acGridIntegrate(const Stream stream, const AcReal dt)
acTransferCommData(device, sidexz_a0s, sidexz_b0s, &sidexz_data);
acTransferCommData(device, sideyz_a0s, sideyz_b0s, &sideyz_data);
acTransferCommDataWait(corner_data);
// acTransferCommDataWait(corner_data);
acTransferCommDataWait(edgex_data);
acTransferCommDataWait(edgey_data);
acTransferCommDataWait(edgez_data);
@@ -1815,7 +1814,7 @@ acGridIntegrate(const Stream stream, const AcReal dt)
acTransferCommDataWait(sideyz_data);
#if MPI_GPUDIRECT_DISABLED
acTransferCommDataToDevice(device, &corner_data);
// acTransferCommDataToDevice(device, &corner_data);
acTransferCommDataToDevice(device, &edgex_data);
acTransferCommDataToDevice(device, &edgey_data);
acTransferCommDataToDevice(device, &edgez_data);
@@ -1825,7 +1824,7 @@ acGridIntegrate(const Stream stream, const AcReal dt)
#endif
#if AC_MPI_RT_PINNING
acUnpinCommData(device, &corner_data);
// acUnpinCommData(device, &corner_data);
acUnpinCommData(device, &edgex_data);
acUnpinCommData(device, &edgey_data);
acUnpinCommData(device, &edgez_data);
@@ -1834,7 +1833,7 @@ acGridIntegrate(const Stream stream, const AcReal dt)
acUnpinCommData(device, &sideyz_data);
#endif
acUnpackCommData(device, corner_b0s, &corner_data);
// acUnpackCommData(device, corner_b0s, &corner_data);
acUnpackCommData(device, edgex_b0s, &edgex_data);
acUnpackCommData(device, edgey_b0s, &edgey_data);
acUnpackCommData(device, edgez_b0s, &edgez_data);
@@ -1844,7 +1843,7 @@ acGridIntegrate(const Stream stream, const AcReal dt)
//////////// OUTER INTEGRATION //////////////
// Wait for unpacking
acSyncCommData(corner_data);
// acSyncCommData(corner_data);
acSyncCommData(edgex_data);
acSyncCommData(edgey_data);
acSyncCommData(edgez_data);